FN4900 Rev.13.00 Page 1 of 28
May.2.19
ICL3225E, ICL3227E, ICL3245E
±15kV ESD Protected, +3V to +5.5V, 1µA, 1Mbps, RS-232 Transceivers with
Enhanced Automatic Powerdown
Datasheet
The ICL3225E, ICL3227E, and ICL3245E devices are
3.0V to 5.5V powered RS-232 transmitters/receivers
that meet ElA/TIA-232 and V.28/V.24 specifications,
even at VCC = 3.0V. They provide ±15kV ESD
protection (IEC61000-4-2 Air Gap and Human Body
Model) on transmitter outputs and receiver inputs
(RS-232 pins). Targeted applications are PDAs,
Palmtops, and notebook and laptop computers where
the low operational power consumption and even
lower standby power consumption are critical.
Efficient on-chip charge pumps coupled with manual
and enhanced automatic powerdown functions,
reduce the standby supply current to a 1µA trickle.
Small footprint packaging and the use of small, low
value capacitors ensure board space savings. Data
rates greater than 1Mbps are ensured at worst case
load conditions. This family is fully compatible with
3.3V only systems, mixed 3.3V and 5.0V systems,
and 5.0V only systems.
The ICL3245E is a 3-driver, 5-receiver device that
provides a complete serial port suitable for laptop or
notebook computers. It also includes a noninverting
always-active receiver for “wake-up” capability.
The ICL3225E, ICL3227E, and ICL3245E feature an
enhanced automatic powerdown function that powers
down the on-chip power supply and driver circuits.
Powerdown occurs when all receiver and transmitter
inputs detect no signal transitions for a period of 30s.
These devices power back up automatically
whenever they sense a transition on any transmitter
or receiver input.
Table 1 summarizes the features of the device
represented by this datasheet and AN9863
summarizes the features of each device in the
ICL32xxE 3V family.
Related Literature
For a full list of related documents, visit our website:
•ICL3225E, ICL3227E, and ICL3245E device pages
Features
• Pb-free (RoHS compliant)
• ESD protection for RS-232 I/O pins to ±15kV
(IEC61000)
• Manual and enhanced automatic powerdown
features
• Drop in replacements for MAX3225E, MAX3227E,
MAX3245E
• RS-232 compatible with VCC = 2.7V
• Meets EIA/TIA-232 and V.28/V.24 specifications at
3V
• Latch-up free
• On-chip voltage converters require only four
external 0.1µF capacitors
• Ensured mouse driveability (ICL3245E)
• “Ready to Transmit” indicator output
(ICL3225E/ICL3227E)
• Receiver hysteresis for improved noise immunity
• Ensured minimum data rate: 1Mbps
• Low skew at transmitter/receiver input trip
points: 10ns
• Ensured minimum slew rate: 24V/µs
• Wide power supply range: single +3V to +5.5V
• Low supply current in powerdown state: 1µA
Applications
• Any system requiring RS-232 communication ports
○ Battery powered, hand-held, and portable
equipment
○ Laptop computers, notebooks, palmtops
○ Modems, printers, and other peripherals
○ Digital cameras
○ Cellular/mobile phones
ICL3225E, ICL3227E, ICL3245E
FN4900 Rev.13.00 Page 2 of 28
May.2.19
Contents
1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Typical Operating Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Pin Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4 Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2. Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Thermal Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.3 Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4 Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3. Typical Performance Curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4. Application Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1 Charge Pump. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.1.1 Charge Pump Abs Max Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.2 Transmitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3 Receivers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4 Powerdown Functionality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4.1 Software Controlled (Manual) Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4.2 INVALID Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4.3 Enhanced Automatic Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.4.4 Emulating Standard Automatic Powerdown. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.4.5 Hybrid Automatic Powerdown Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.5 READY Output (ICL3225E and ICL3227E Only). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.6 Capacitor Selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.7 Power Supply Decoupling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.8 Operation Down to 2.7V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.9 Transmitter Outputs when Exiting Powerdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.10 Mouse Driveability . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.11 High Data Rates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.12 Interconnection with 3V and 5V Logic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5. ±15kV ESD Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.1 Human Body Model (HBM) Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.2 IEC61000-4-2 Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.3 Air-Gap Discharge Test Method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.4 Contact Discharge Test Method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6. Die Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
7. Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
8. Package Outline Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
ICL3225E, ICL3227E, ICL3245E 1. Overview
FN4900 Rev.13.00 Page 3 of 28
May.2.19
1. Overview
1.1 Typical Operating Circuits
Figure 1. ICL3225E
Figure 2. ICL3227E
19
VCC
T1OUT
T2OUT
T1IN
T2IN
T1
T2
0.1µF
+0.1µF
+
0.1µF
13
12
17
8
2
4
3
7
V+
V-
C1+
C1-
C2+
C2-
+
0.1µF
5
6
R1OUT R1IN
16
5kΩ
R2OUT R2IN
910
5kΩ
15
C1
C2
+C3
C4
READY
1
GND
+3.3V +0.1µF
18
TTL/CMOS
Logic Levels
RS-232
Levels
R1
R2
FORCEON
FORCEOFF
14
20 VCC
11
INVALID To Power
Control Logic
15
VCC
T1OUT
T1IN
T1
0.1µF
+0.1µF
+
0.1µF
11 13
2
4
3
7
V+
V-
C1+
C1-
C2+
C2-
+
0.1µF
5
6
R1OUT R1IN
R1
89
5kΩ
C1
C2
+C3
C4
READY
1
GND
+3.3V +0.1µF
14
TTL/CMOS
Logic Levels
RS-232
Levels
FORCEON
FORCEOFF
12
16 VCC
10
INVALID To Power
Control Logic
ICL3225E, ICL3227E, ICL3245E 1. Overview
FN4900 Rev.13.00 Page 4 of 28
May.2.19
Figure 3. ICL3245E
26
VCC
T1OUT
T2OUT
T3OUT
T1IN
T2IN
T3IN
T1
T2
T3
0.1µF
+
0.1µF
+
0.1µF
14
13
9
10
12 11
28
24
27
3
V+
V-
C1+
C1-
C2+
C2-
+
0.1µF
1
2
R1OUT R1IN
4
5kΩ
R2OUT R2IN
518
5kΩ
R3OUT R3IN
617
5kΩ
R4OUT R4IN
716
5kΩ
R5OUT R5IN
R5
815
5kΩ
19
R2OUTB
C1
C2
+C3
C4
FORCEON
FORCEOFF
23
GND
22
+3.3V +0.1µF
20
25
VCC
TTL/CMOS
Logic Levels
RS-232
Levels
RS-232
Levels
R1
R2
R3
R4
21
INVALID
To Power
Control Logic
ICL3225E, ICL3227E, ICL3245E 1. Overview
FN4900 Rev.13.00 Page 5 of 28
May.2.19
1.2 Ordering Information
1.3 Pin Configurations
Part Number
(Notes 2, 3) Part Marking Temp Range (°C)
Tape and Reel
(Units) (Note 1)
Package
(RoHS Compliant) Pkg. Dwg. #
ICL3225ECAZ ICL3225ECAZ 0 to +70 - 20 Ld SSOP M20.209
ICL3225ECAZ-T ICL3225ECAZ 0 to +70 1k 20 Ld SSOP M20.209
ICL3225EIAZ ICL3225EIAZ -40 to +85 - 20 Ld SSOP M20.209
ICL3225EIAZ-T ICL3225EIAZ -40 to +85 1k 20 Ld SSOP M20.209
ICL3227ECAZA 3227ECAZ 0 to +70 - 16 Ld SSOP M16.209
ICL3227ECAZA-T 3227ECAZ 0 to +70 1k 16 Ld SSOP M16.209
ICL3227EIAZA 3227EIAZ -40 to +85 - 16 Ld SSOP M16.209
ICL3227EIAZA-T 3227EIAZ -40 to +85 1k 16 Ld SSOP M16.209
ICL3245ECAZ ICL3245ECAZ 0 to +70 - 28 Ld SSOP M28.209
ICL3245ECAZ-T ICL3245ECAZ 0 to +70 1k 28 Ld SSOP M28.209
ICL3245EIAZ ICL3245EIAZ -40 to +85 - 28 Ld SSOP M28.209
ICL3245EIAZ-T ICL3245EIAZ -40 to +85 1k 28 Ld SSOP M28.209
Notes:
1. See TB347 for details about reel specifications.
2. These Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte
tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations).
Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J-
STD-020.
3. For Moisture Sensitivity Level (MSL), see the ICL3225E, ICL3227E, and ICL3245E device pages. For more information about MSL, see
TB363.
Table 1. Summary of Features
Part Number
Number
of Tx.
Number
of Rx.
Number of
Monitor Rx.
(ROUTB)
Data Rate
(kbps)
Rx. Enable
Function?
Ready
Output?
Manual
Powerdown?
Enhanced
Automatic
Powerdown
Function?
ICL3225E 2 2 0 1000 No Yes Yes Yes
ICL3227E 1 1 0 1000 No Yes Yes Yes
ICL3245E 3 5 1 1000 No No Yes Yes
ICL3225E (SSOP)
Top View
ICL3227E (SSOP)
Top View
READY
C1+
V+
C1-
C2+
C2-
V-
T2OUT
R2IN
FORCEOFF
GND
T1OUT
R1IN
R1OUT
T1IN
INVALID
VCC
FORCEON
T2IN
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
R2OUT
READY
C1+
V+
C1-
C2+
C2-
V-
R1IN
FORCEOFF
GND
T1OUT
FORCEON
T1IN
R1OUT
VCC
INVALID
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
ICL3225E, ICL3227E, ICL3245E 1. Overview
FN4900 Rev.13.00 Page 6 of 28
May.2.19
1.4 Pin Descriptions
ICL3245E (SSOP)
Top View
Pin Function
VCC System power supply input (3.0V to 5.5V).
V+ Internally generated positive transmitter supply (+5.5V).
V- Internally generated negative transmitter supply (-5.5V).
GND Ground connection.
C1+ External capacitor (voltage doubler) is connected to this lead.
C1- External capacitor (voltage doubler) is connected to this lead.
C2+ External capacitor (voltage inverter) is connected to this lead.
C2- External capacitor (voltage inverter) is connected to this lead.
TxIN TTL/CMOS compatible transmitter Inputs.
TxOUT ±15kV ESD protected, RS-232 level (nominally ±5.5V) transmitter outputs.
RxIN ±15kV ESD protected, RS-232 compatible receiver inputs.
RxOUT TTL/CMOS level receiver outputs.
R2OUTB TTL/CMOS level, noninverting, always enabled receiver outputs.
INVALID Active low output that indicates if no valid RS-232 levels are present on any receiver input.
READY Active high output that indicates when the ICL32xxE is ready to transmit (V- ≤ -4V).
FORCEOFF Active low to shut down transmitters and on-chip power supply, which overrides any automatic circuitry and FORCEON (see
Table 5 on page 15).
FORCEON Active high input to override automatic powerdown circuitry and keeps transmitters active. (FORCEOFF must be high).
C2+
C2-
V-
R1IN
R2IN
R3IN
R4IN
R5IN
T1OUT
T3OUT
T3IN
T2IN
T1IN
C1+
VCC
GND
C1-
FORCEON
INVALID
R1OUT
R2OUT
R3OUT
R4OUT
R5OUT
V+
FORCEOFF
R2OUTB
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
T2OUT
ICL3225E, ICL3227E, ICL3245E 2. Specifications
FN4900 Rev.13.00 Page 7 of 28
May.2.19
2. Specifications
2.1 Absolute Maximum Ratings
2.2 Thermal Information
2.3 Recommended Operating Conditions
Parameter Minimum Maximum Unit
VCC to GND -0.3 6 V
V+ to GND -0.3 7 V
V- to GND +0.3 -7 V
V+ to V- 14 V
Input Voltages
TIN, FORCEOFF, FORCEON -0.3 6 V
RIN ±25 V
Output Voltages
TOUT ±13.2 V
ROUT
, INVALID, READY -0.3 VCC +0.3 V
Short-Circuit Duration
TOUT Continuous
ESD Rating (See “ESD Performance” on page 9)
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions can adversely
impact product reliability and result in failures not covered by warranty.
Thermal Resistance (Typical, Note 4)θ
JA (°C/W)
16 Ld SSOP Package 145
20 Ld SSOP Package 135
28 Ld SSOP Package 100
Notes:
4. θJA is measured with the component mounted on a low-effective thermal conductivity test board in free air. See TB379 for details.
Parameter Minimum Maximum Unit
Maximum Junction Temperature (Plastic Package) +150 °C
Maximum Storage Temperature Range -65 +150 °C
Pb-Free Reflow Profile see TB493
Parameter Minimum Maximum Unit
Temperature Range
ICL32xxEC 0 +70 °C
ICL32xxEI -40 +85 °C
ICL3225E, ICL3227E, ICL3245E 2. Specifications
FN4900 Rev.13.00 Page 8 of 28
May.2.19
2.4 Electrical Specifications
Test conditions: VCC = 3V to 5.5V, C1 - C4 = 0.1µF; unless otherwise specified. Typicals are at TA = +25°C
Parameter Test Conditions
Temp
(°C) Min Typ Max Unit
DC Characteristics
Supply Current, Automatic
Powerdown
All RIN open, FORCEON = GND, FORCEOFF = VCC +25 - 1.0 10 µA
Supply Current, Powerdown FORCEOFF = GND +25 - 1.0 10 µA
Supply Current,
Automatic Powerdown Disabled
All outputs unloaded, FORCEON = FORCEOFF = VCC +25 - 0.3 1.0 mA
Logic and Transmitter Inputs and Receiver Outputs
Input Logic Threshold Low TIN, FORCEON, FORCEOFF Full - - 0.8 V
Input Logic Threshold High TIN, FORCEON,
FORCEOFF
VCC = 3.3V Full 2.0 - - V
VCC = 5.0V Full 2.4 - - V
Input Leakage Current TIN, FORCEON, FORCEOFF Full - ±0.01 ±1.00 µA
Output Leakage Current FORCEOFF = GND, ICL3245E only Full - ±0.05 ±10 µA
Output Voltage Low IOUT = 1.6mA Full - - 0.4 V
Output Voltage High IOUT = -1.0mA Full VCC - 0.6 VCC - 0.1 - V
Receiver Inputs
Input Voltage Range Full -25 - 25 V
Input Threshold Low VCC = 3.3V +25 0.6 1.2 - V
VCC = 5.0V +25 0.8 1.5 - V
Input Threshold High VCC = 3.3V +25 - 1.5 2.4 V
VCC = 5.0V +25 - 1.8 2.4 V
Input Hysteresis +25 - 0.5 - V
Input Resistance +25 3 5 7 kΩ
Transmitter Outputs
Output Voltage Swing All transmitter outputs loaded with 3kΩ to Ground Full ±5.0 ±5.4 - V
Output Resistance VCC = V+ = V- = 0V, transmitter output = ±2V Full 300 10M - Ω
Output Short-Circuit Current Full - ±35 ±60 mA
Output Leakage Current VOUT = ±12V, VCC = 0V or 3V to 5.5V, automatic powerdown
or FORCEOFF = GND
Full - - ±25 µA
Mouse Driveability
Transmitter Output Voltage
(See Figure 20 on page 20)
T1IN = T2IN = GND, T3IN = VCC, T3OUT loaded with 3kΩ to
GND, T1OUT and T2OUT loaded with 2.5mA each
Full ±5 - - V
Enhanced Automatic Powerdown (FORCEON = GND, FORCEOFF = VCC)
Receiver Input Thresholds to
INVALID High
See Figure 15 on page 17 Full -2.7 - 2.7 V
Receiver Input Thresholds to
INVALID Low
See Figure 15 on page 17 Full -0.3 - 0.3 V
INVALID, READY Output Voltage
Low
IOUT = 1.6mA Full - - 0.4 V
INVALID, READY Output Voltage
High
IOUT = -1.0mA Full VCC - 0.6 - - V
Receiver Positive or Negative
Threshold to INVALID High Delay
(tINVH)
+25 - 1 - µs
ICL3225E, ICL3227E, ICL3245E 2. Specifications
FN4900 Rev.13.00 Page 9 of 28
May.2.19
Receiver Positive or Negative
Threshold to INVALID Low Delay
(tINVL)
+25 - 30 - µs
Receiver or Transmitter Edge to
Transmitters Enabled Delay (tWU)
(Note 5) 25 - 100 - µs
Receiver or Transmitter Edge to
Transmitters Disabled Delay
(tAUTOPWDN)
(Note 5) Full 15 30 60 sec
Timing Characteristics
Maximum Data Rate RL = 3kΩ, one transmitter
switching
CL = 1000pF Full 250 - - kbps
VCC = 3V to 4.5V, CL = 250pF Full 1000 - - kbps
VCC = 4.5V to 5.5V,
CL= 1000pF
Full 1000 - - kbps
Receiver Propagation Delay Receiver input to receiver
output, CL = 150pF
tPHL +25 - 0.15 - µs
tPLH +25 - 0.15 - µs
Receiver Output Enable Time Normal operation (ICL3245E only) +25 - 200 - ns
Receiver Output Disable Time Normal operation (ICL3245E only) +25 - 200 - ns
Transmitter Skew tPHL - tPLH (Note 6)+25-25-ns
Receiver Skew tPHL - tPLH (Note 6)+25-50-ns
Transition Region Slew Rate VCC = 3.3V, RL = 3kΩ to 7kΩ, measured from 3V to -3V or
-3V to 3V, CL = 150pF to 1000pF
+25 24 - 150 V/µs
ESD Performance
RS-232 Pins (TOUT
, RIN) Human body model +25 - ±15 - kV
IEC61000-4-2 contact discharge +25 - ±8 - kV
IEC61000-4-2 air gap discharge +25 - ±15 - kV
All Other Pins ICL3245E Human body model (HBM) +25 - ±2 - kV
Charged Device Model (CDM) +25 - ±1.5 - kV
ICL3225E, ICL3227E Human body model (HBM) +25 - ±4 - kV
Charged Device Model (CDM) +25 - ±2 - kV
Notes:
5. An “edge” is defined as a transition through the transmitter or receiver input thresholds.
6. Skews are measured at the receiver input switching points (1.4V).
Test conditions: VCC = 3V to 5.5V, C1 - C4 = 0.1µF; unless otherwise specified. Typicals are at TA = +25°C (Continued)
Parameter Test Conditions
Temp
(°C) Min Typ Max Unit
ICL3225E, ICL3227E, ICL3245E 3. Typical Performance Curves
FN4900 Rev.13.00 Page 10 of 28
May.2.19
3. Typical Performance Curves
VCC = 3.3V, TA = +25°C
Figure 4. Transmitter Output Voltage vs Load
Capacitance
Figure 5. Slew Rate vs Load Capacitance
Figure 6. Supply Current vs Load Capacitance When
Transmitting Data
Figure 7. Supply Current vs Load Capacitance When
Transmitting Data
-6
-4
-2
0
2
4
6
1000 2000 3000 4000 50000
Load Capacitance (pF)
Transmitter Output Voltage (V)
1 Transmitter at 1Mbps
VOUT+
VOUT-
Other Transmitters at 30kbps
Load Capacitance (pF)
Slew Rate (V/µs)
0 1000 2000 3000 4000 5000
0
10
30
50
110
-SLEW
+SLEW
70
90
01000 2000 3000 4000 5000
Load Capacitance (pF)
Supply Current (mA)
10
20
30
40
50
80
60
70
90
250kbps
120kbps
ICL3225E
1Mbps
0 1000 2000 3000 4000 5000
Load Capacitance (pF)
Supply Current (mA)
10
20
30
40
50
80
60
70
90
ICL3227E
250kbps
120kbps
1Mbps
ICL3225E, ICL3227E, ICL3245E 3. Typical Performance Curves
FN4900 Rev.13.00 Page 11 of 28
May.2.19
Figure 8. Supply Current vs Load Capacitance When
Transmitting Data
Figure 9. Supply Current vs Supply Voltage
VCC = 3.3V, TA = +25°C (Continued)
10
20
30
40
50
80
60
70
0 1000 2000 3000 4000 5000
Load Capacitance (pF)
Supply Current (mA)
120kbps
1Mbps
250kbps
90
ICL3245E
Supply Current (mA)
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
0
0.5
1.0
1.5
2.0
Supply Voltage (V)
2.5
3.0
3.5
No Load
All Outputs Static
ICL3225E, ICL3227E, ICL3245E 4. Application Information
FN4900 Rev.13.00 Page 12 of 28
May.2.19
4. Application Information
The ICL3225E, ICL3227E, and ICL3245E (ISL32xxE) operate from a single +3V to +5.5V supply, ensure a 1Mbps
minimum data rate, require only four small external 0.1µF capacitors, feature low power consumption, and meet
all ElA RS-232C and V.28 specifications.
4.1 Charge Pump
The ICL32xxE use regulated on-chip dual charge pumps as voltage doublers, and voltage inverters to generate
±5.5V transmitter supplies from a VCC supply as low as 3.0V, which allows these devices to maintain RS-232
compliant output levels over the ±10% tolerance range of 3.3V powered systems. The efficient on-chip power
supplies require only four small, external 0.1µF capacitors for the voltage doubler and inverter functions at
VCC = 3.3V. See the Capacitor Selection, and Table 6 on page 19 for capacitor recommendations for other
operating conditions. The charge pumps operate discontinuously (turning off when the V+ and V- supplies are
pumped up to the nominal values), resulting in significant power savings.
4.1.1 Charge Pump Abs Max Ratings
These 3V to 5V RS-232 transceivers have been fully characterized for 3.0V to 3.6V operation and for critical
points at 4.5V to 5.5V operation. Furthermore, load conditions were favorable using static logic states only.
The specified maximum values for V+ and V- are +7V and -7V, respectively. These limits apply for VCC values set
to 3.0V and 3.6V (see Table 2). For VCC values set to 4.5V and 5.5V, the maximum values for V+ and V- can
approach +9V and -7V, respectively (Table 3 on page 13). The breakdown characteristics for V+ and V- were
measured with ±13V.
Table 2. V+ and V- Values for VCC = 3.0V to 3.6V
C1 (μF) C2, C3, C4 (μF) Load
T1IN
(Logic State)
V+ (V) V- (V)
VCC = 3.0V VCC = 3.6V VCC = 3.0V VCC = 3.6V
0.1 0.1 Open H 5.80 6.56 -5.60 -5.88
L 5.80 6.56 -5.60 -5.88
2.4kbps 5.80 6.56 -5.60 -5.88
3kΩ // 1000pF H 5.88 6.60 -5.56 -5.92
L 5.76 6.36 -5.56 -5.76
2.4kbps 6.00 6.64 -5.64 -5.96
0.047 0.33 Open H 5.68 6.00 -5.60 -5.60
L 5.68 6.00 -5.60 -5.60
2.4kbps 5.68 6.00 -5.60 -5.60
3kΩ // 1000pF H 5.76 6.08 -5.64 -5.64
L 5.68 6.04 -5.60 -5.60
2.4kbps 5.84 6.16 -5.64 -5.72
1 1 Open H 5.88 6.24 -5.60 -5.60
L 5.88 6.28 -5.60 -5.64
2.4kbps 5.80 6.20 -5.60 -5.60
3kΩ // 1000pF H 5.88 6.44 -5.64 -5.72
L 5.88 6.04 -5.64 -5.64
2.4kbps 5.92 6.40 -5.64 -5.64
ICL3225E, ICL3227E, ICL3245E 4. Application Information
FN4900 Rev.13.00 Page 13 of 28
May.2.19
The resulting new maximum voltages at V+ and V- are listed in Table 4.
4.2 Transmitters
The transmitters are proprietary, low dropout, inverting drivers that translate TTL/CMOS inputs to EIA/TIA-232
output levels. The transmitters are coupled with the on-chip ±5.5V supplies to deliver true RS-232 levels over a
wide range of single supply system voltages.
Transmitter outputs disable and assume a high impedance state when the device enters the powerdown mode
(see Table 5 on page 15). The outputs can be driven to ±12V when disabled.
All devices ensure a 1Mbps data rate for full load conditions (3kΩ and 250pF), VCC ≥ 3.0V, with one transmitter
operating at full speed. Under more typical conditions of VCC ≥ 3.3V, RL= 3kΩ, and CL = 250pF, one transmitter
easily operates at 1.4Mbps. Transmitter skew is extremely low on these devices, and is specified at the receiver
input trip points (1.4V), rather than the arbitrary 0V crossing point typical of other RS-232 families.
Transmitter inputs float if they remain unconnected and can increase ICC. Connect unused inputs to GND for best
performance.
Table 3. V+ and V- Values for VCC = 4.5V to 5.5V
C1 (μF) C2, C3, C4 (μF) Load
T1IN
(Logic State)
V+ (V) V- (V)
VCC = 4.5V VCC = 5.5V VCC = 4.5V VCC = 5.5V
0.1 0.1 Open H 7.44 8.48 -6.16 -6.40
L 7.44 8.48 -6.16 -6.44
2.4kbps 7.44 8.48 -6.17 -6.44
3kΩ // 1000pF H 7.76 8.88 -6.36 -6.72
L 7.08 8.00 -5.76 -5.76
2.4kbps 7.76 8.84 -6.40 -6.64
0.047 0.33 Open H 6.44 6.88 -5.80 -5.88
L 6.48 6.88 -5.84 -5.88
2.4kbps 6.44 6.88 -5.80 -5.88
3kΩ // 1000pF H 6.64 7.28 -5.92 -6.04
L 6.24 6.60 -5.52 -5.52
2.4kbps 6.72 7.16 -5.92 -5.96
1 1 Open H 6.84 7.60 -5.76 -5.76
L 6.88 7.60 -5.76 -5.76
2.4kbps 6.92 7.56 -5.72 -5.76
3kΩ // 1000pF H 7.28 8.16 -5.80 -5.92
L 6.44 6.84 -5.64 -6.84
2.4kbps 7.08 7.76 -5.80 -5.80
Table 4. New Measured Withstanding Voltages
V+, V- to Ground ±13V
V+ to V- 20V
ICL3225E, ICL3227E, ICL3245E 4. Application Information
FN4900 Rev.13.00 Page 14 of 28
May.2.19
4.3 Receivers
All the ICL32xxE devices contain standard inverting receivers, but only the ICL3245E receivers can tri-state using
the FORCEOFF control line. The ICL3245E includes a noninverting (monitor) receiver (denoted by the ROUTB
label) that is always active regardless of the state of any control lines. Both receiver types convert RS-232 signals
to CMOS output levels and accept inputs up to ±25V while presenting the required 3kΩ to 7kΩ input impedance
(see Figure 10) even if the power is off (VCC = 0V). The receivers’ Schmitt trigger input stage uses hysteresis to
increase noise immunity and decrease errors due to slow input signal transitions.
The ICL3245E inverting receivers disable during forced (manual) powerdown, but not during automatic
powerdown (see Tab l e 5). Conversely, the monitor receiver remains active even during manual powerdown,
which makes it extremely useful for Ring Indicator monitoring. Standard receivers driving powered down
peripherals must be disabled to prevent current flow through the peripheral’s protection diodes (see Figures 11
and 12). When powered down, they cannot be used for wake-up functions, but the corresponding monitor receiver
can be dedicated to this task as shown in Figure 12.
Figure 10. Inverting Receiver Connections
Figure 11. Power Drain Through Powered Down Peripheral Figure 12. Disabled Receivers Prevent Power Drain
RXOUT
GND ≤ VROUT ≤ VCC
5kΩ
RXIN
-25V ≤ VRIN ≤ +25V
GND
VCC
Old
VCC
Powered
GND SHDN = GND
VCC
Rx
Tx
VCC
Current
VOUT = VCC
Flow
RS-232 Chip
Down
UART
ICL3245E
Transition
RX
TX
R2OUTB
R2OUT
T1IN
FORCEOFF = GND
VCC
VCC
To
R2IN
T1OUT
VOUT = HI-Z
Powered
Detector
Down
UART
Wake-Up
Logic
ICL3225E, ICL3227E, ICL3245E 4. Application Information
FN4900 Rev.13.00 Page 15 of 28
May.2.19
4.4 Powerdown Functionality
The 3V ICL32xxE devices require a nominal supply current of 0.3mA during normal operation (not in powerdown
mode). This current is considerably less than the 5mA to 11mA current required of 5V RS-232 devices. The
already low current requirement drops significantly when the device enters powerdown mode. In powerdown,
supply current drops to 1µA, because the on-chip charge pump turns off (V+ collapses to VCC, V- collapses to
GND), and the transmitter outputs tri-state. Inverting receiver outputs may or may not disable in powerdown; see
Tabl e 5 for details. This micro-power mode makes these devices ideal for battery powered and portable
applications.
Table 5. Powerdown Logic Truth Table
RCVR or
XMTR
EDGE
Within 30
Sec?
FORCEOFF
Input
FORCEON
Input
Transmitter
Outputs
Receiver
Outputs
ROUTB
Outputs
(Note 7)
RS-232
Level
Present at
Receiver
Input?
INVALID
Output Mode of Operation
ICL3225E, ICL3227E
No H H Active Active N.A. No L Normal Operation (Enhanced
Auto Powerdown Disabled)
No H H Active Active N.A. Yes H
Yes H L Active Active N.A. No L Normal Operation (Enhanced
Auto Powerdown Enabled)
Yes H L Ac ti ve Active N.A. Yes H
No H L High-Z Active N.A. No L Powerdown Due to Enhanced
Auto Powerdown Logic
No H L High-Z Active N.A. Yes H
X L X High-Z Active N.A. No L Manual Powerdown
X L X High-Z Active N.A. Yes H
ICL322XE - INVALID Driving FORCEON and FORCEOFF (Emulates Automatic Powerdown)
XNote 8 Note 8 Active Active N.A. Yes H Normal Operation
XNote 8 Note 8 High-Z Active N.A. No L Forced Auto Powerdown
ICL3245E
No H H Active Active Active No L Normal Operation (Enhanced
Auto Powerdown Disabled)
No H H Active Active Active Yes H
Yes H L Active Active Active No L Normal Operation (Enhanced
Auto Powerdown Enabled)
Yes H L Active Active Active Yes H
No H L High-Z Active Active No L Powerdown Due to Enhanced
Auto Powerdown Logic
No H L High-Z Active Active Yes H
X L X High-Z High-Z Active No L Manual Powerdown
X L X High-Z High-Z Active Yes H
ICL3245E - INVALID Driving FORCEON and FORCEOFF (Emulates Automatic Powerdown)
XNote 8 Note 8 Active Active Active Yes H Normal Operation
XNote 8 Note 8 High-Z High-Z Active No L Forced Auto Powerdown
Notes:
7. Applies only to the ICL3245E.
8. Input is connected to INVALID Output.
ICL3225E, ICL3227E, ICL3245E 4. Application Information
FN4900 Rev.13.00 Page 16 of 28
May.2.19
4.4.1 Software Controlled (Manual) Powerdown
The ICL32xxE devices allow you to force the IC into the low power, standby state, and use a two pin approach
where the FORCEON and FORCEOFF inputs determine the IC’s mode. For always enabled operation,
FORCEON and FORCEOFF are both strapped high. Under logic or software control, only the FORCEOFF input
needs to be driven to switch between active and power-down modes. The FORCEON state is not critical because
FORCEOFF overrides FORCEON. However, if strictly manual control over power-down is needed, you must strap
FORCEON high to disable the automatic powerdown circuitry. The ICL3245E inverting (standard) receiver
outputs also disable when the device is in powerdown, and eliminate the possible current path through a
shutdown peripheral’s input protection diode (see Figures 11 and 12).
Connecting FORCEOFF and FORCEON together disables the enhanced automatic powerdown feature, which
enables them to function as a manual SHUTDOWN input (see Figure 13).
With any of the above control schemes, the time required to exit powerdown and resume transmission is only
100µs.
When using both manual and enhanced automatic powerdown (FORCEON = 0), the ICL32xxE devices do not
power up from manual powerdown until both FORCEOFF and FORCEON are driven high, or until a transition
occurs on a receiver or transmitter input. Figure 14 shows a circuit for ensuring that the ICL32xxE powers up as
soon as FORCEOFF switches high. The rising edge of the master powerdown signal forces the device to power
up, and the ICL32xxE returns to enhanced automatic powerdown mode an RC time constant after this rising
edge. The time constant is not critical, because the ICL32xxE remains powered up for 30 seconds after the
FORCEON falling edge, even if there are no signal transitions. The delay gives slow-to-wake systems (such as a
mouse) plenty of time to start transmitting, and as long as it starts transmitting within 30 seconds both systems
remain enabled.
4.4.2 INVALID Output
Table 5 on page 15 on the INVALID output always indicates whether 30µs have elapsed with invalid RS-232
signals (see Figures 15 and 17) persisting on all of the receiver inputs, and provides you a way to determine when
Figure 13. Connections for Manual Powerdown When No Valid Receiver Signals are Present
Figure 14. Circuit to Ensure Immediate Power Up When Exiting Forced Powerdown
Power
FORCEOFF
INVALID
CPU
I/O
FORCEON
ICL32xxE
Management
Logic
UART
FORCEOFF FORCEON
Power Master Powerdown Line
1MΩ
0.1µF
Management
Unit
ICL32xxE
ICL3225E, ICL3227E, ICL3245E 4. Application Information
FN4900 Rev.13.00 Page 17 of 28
May.2.19
the interface block should power down. Invalid receiver levels occur whenever the driving peripheral’s outputs are
shut off (powered down) or when the RS-232 interface cable is disconnected. If an interface cable is disconnected
and all the receiver inputs are floating (but pulled to GND by the internal receiver pull down resistors), the
INVALID logic detects the invalid levels and drives the output low. The power management logic then uses this
indicator to power down the interface block. Reconnecting the cable restores valid levels at the receiver inputs,
INVALID switches high, and the power management logic wakes up the interface block. INVALID can also be
used to indicate the DTR or RING INDICATOR signal, as long as the other receiver inputs are floating, or driven to
GND (as in the case of a powered down driver).
4.4.3 Enhanced Automatic Powerdown
Even greater power savings are available by using the ICL32xxE's enhanced automatic powerdown function.
When the enhanced powerdown logic determines that no transitions have occurred on any of the transmitter or
receiver inputs for 30 seconds, the charge pump and transmitters powerdown, and reduces supply current to 1µA.
The ICL32xxE devices automatically power back up whenever they detect a transition on one of these inputs. The
automatic powerdown feature provides additional system power savings without changes to the existing operating
system.
Enhanced automatic powerdown operates when the FORCEON input is low and the FORCEOFF input is high.
Tying FORCEON high disables automatic powerdown, but manual powerdown is always available using the
overriding FORCEOFF input. Table 5 on page 15 summarizes the enhanced automatic powerdown functionality.
Figure 16 shows the enhanced powerdown control logic. Note: When the ICL32xxE enters powerdown (manually
or automatically), the 30 second timer remains timed out (set), keeping the ICL32xxE powered down until
FORCEON transitions high, or until a transition occurs on a receiver or transmitter input.
The INVALID output signal switches low to indicate that invalid levels have persisted on all of the receiver inputs
for more than 30µs (see Figure 17), but this has no direct effect on the state of the ICL32xxE (see the next
sections for methods of using INVALID to power down the device). INVALID switches high 1µs after detecting a
valid RS-232 level on a receiver input. INVALID operates in all modes (forced or automatic powerdown, or forced
on), so it is also useful for systems employing manual powerdown circuitry.
Figure 15. Definition of Valid RS-232 Receiver Levels
Figure 16. Enhanced Automatic Powerdown Logic
0.3V
-0.3V
-2.7V
2.7V
Invalid Level - INVALID = 0
Valid RS-232 Level - INVALID = 1
Valid RS-232 Level - INVALID = 1
Indeterminate
Indeterminate
30s
Timer
S
R
FORCEOFF
AUTOSHDN
FORCEON
R_IN
T_IN Edge
Detect
Edge
Detect
ICL3225E, ICL3227E, ICL3245E 4. Application Information
FN4900 Rev.13.00 Page 18 of 28
May.2.19
The time to recover from automatic powerdown mode is typically 100µs.
4.4.4 Emulating Standard Automatic Powerdown
If enhanced automatic powerdown is not desired, you can implement the standard automatic powerdown feature
(mimics the function on the ICL3221E/ICL3223E/ICL3243E) by connecting the INVALID output to the FORCEON
and FORCEOFF inputs, as shown in Figure 18. After 30µs of invalid receiver levels, INVALID switches low and
drives the ICL32xxE into a forced powerdown condition. INVALID switches high as soon as a receiver input
senses a valid RS-232 level, forcing the ICL32xxE to power on. See “ICL322XE - INVALID Driving FORCEON
and FORCEOFF (Emulates Automatic Powerdown)” on page 15 for an operational summary. This operational
mode is perfect for handheld devices that communicate with another computer through a detachable cable.
Detaching the cable allows the internal receiver pull-down resistors to pull the inputs to GND (an invalid RS-232
level), causing the 30µs timer to time out and drive the IC into powerdown. Reconnecting the cable restores valid
levels and causes the IC to power back up.
Figure 17. Connections for Automatic Powerdown When No Valid Receiver Signals are Present
Figure 18. Enhanced Automatic Powerdown, INVALID and READY Timing Diagrams
FORCEOFF
INVALID
CPU
I/O
FORCEON
ICL32xxE
UART
Receiver
Inputs
Transmitter
Outputs
INVALID
Output
V+
VCC
0
V-
tINVL
tINVH
READY
Output
Transmitter
Inputs
tWU
tAUTOPWDN
tAUTOPWDN tWU
Invalid
Region
}
ICL3225E, ICL3227E, ICL3245E 4. Application Information
FN4900 Rev.13.00 Page 19 of 28
May.2.19
4.4.5 Hybrid Automatic Powerdown Options
For devices that communicate only through a detachable cable, you can connect INVALID to FORCEOFF (with
FORCEON = 0). While the cable is attached, INVALID and FORCEOFF remain high, so the enhanced automatic
powerdown logic powers down the RS-232 device whenever there is 30 seconds of inactivity on the receiver and
transmitter inputs. Detaching the cable allows the receiver inputs to drop to an invalid level (GND), so INVALID
switches low and forces the RS-232 device to power down. The ICL32xxE remains powered down until the cable
is reconnected (INVALID = FORCEOFF = 1), and a transition occurs on a receiver or transmitter input (see
Figure 16 on page 17). For immediate power up when the cable is reattached, connect FORCEON to
FORCEOFF through a network similar to that shown in Figure 14 on page 16.
4.5 READY Output (ICL3225E and ICL3227E Only)
The READY output indicates that the ICL322xE is ready to transmit. READY switches low whenever the device
enters powerdown, and switches back high during power-up when V- reaches -4V or lower.
4.6 Capacitor Selection
The charge pumps require 0.1µF capacitors for 3.3V operation. For other supply voltages see Tab l e 6 for
capacitor values. Do not use values smaller than those listed in Tab l e 6 . Increasing the capacitor values (by a
factor of 2) reduces ripple on the transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can
be increased without increasing C1’s value, however, do not increase C1 without also increasing C2, C3, and C4 to
maintain the proper ratios (C1 to the other capacitors).
When using minimum required capacitor values, make sure that capacitor values do not degrade excessively with
temperature. If in doubt, use capacitors with a larger nominal value. The capacitor’s Equivalent Series Resistance
(ESR) usually rises at low temperatures and it influences the amount of ripple on V+ and V-.
4.7 Power Supply Decoupling
In most circumstances a 0.1µF bypass capacitor is adequate. In applications that are particularly sensitive to
power supply noise, decouple VCC to ground with a capacitor of the same value as the charge-pump capacitor C1.
Connect the bypass capacitor as close as possible to the IC.
4.8 Operation Down to 2.7V
The ICL32xxE transmitter outputs meet RS-562 levels (±3.7V), at full data rate, with VCC as low as 2.7V. RS-562
levels typically ensure interoperability with RS-232 devices.
4.9 Transmitter Outputs when Exiting Powerdown
Figure 19 on page 20 shows the response of two transmitter outputs when exiting powerdown mode. As they
activate, the two transmitter outputs properly go to opposite RS-232 levels, with no glitching, ringing, or
undesirable transients. Each transmitter is loaded with 3kΩ in parallel with 2500pF. Note: The transmitters enable
only when the magnitude of the supplies exceed approximately 3V.
Table 6. Required Capacitor Values
VCC (V) C1 (µF) C2, C3, C4 (µF)
3.0 to 3.6 0.1 0.1
4.5 to 5.5 0.047 0.33
3.0 to 5.5 0.1 0.47
ICL3225E, ICL3227E, ICL3245E 4. Application Information
FN4900 Rev.13.00 Page 20 of 28
May.2.19
4.10 Mouse Driveability
The ICL3245E is specifically designed to power a serial mouse while operating from low voltage supplies.
Figure 20 shows the transmitter output voltages under increasing load current. The on-chip switching regulator
ensures the transmitters supply at least ±5V during worst case conditions (15mA for paralleled V+ transmitters,
7.3mA for single V- transmitter).
4.11 High Data Rates
The ICL32xxE maintain the RS-232 ±5V minimum transmitter output voltages even at high data rates. Figure 21
on page 21 shows a transmitter loopback test circuit, and Figure 22 on page 21 shows the loopback test result at
250kbps. For this test, all transmitters were simultaneously driving RS-232 loads in parallel with 1000pF, at
250kbps. Figure 23 on page 21 shows the loopback results for a single transmitter driving 250pF and an RS-232
load at 1Mbps. The static transmitters were also loaded with an RS-232 receiver.
Figure 19. Transmitter Outputs When Exiting Powerdown
Figure 20. Transmitter Output Voltage vs Load Current
(per Transmitter, For Example, Double Current Axis for Total VOUT+ Current)
Time (20µs/Div)
T1
T2
2V/Div
5V/Div
VCC = +3.3V
FORCEOFF
C1 - C4 = 0.1µF
5V/Div READY
Transmitter Output Voltage (V)
Load Current per Transmitter (mA)
0246810
-6
-4
-2
0
2
4
6
-5
-3
-1
1
3
5
13579
VOUT+
VOUT -
VCC
VOUT+
VOUT -
T1
T2
T3
VCC = 3.0V
ICL3245E
ICL3225E, ICL3227E, ICL3245E 4. Application Information
FN4900 Rev.13.00 Page 21 of 28
May.2.19
4.12 Interconnection with 3V and 5V Logic
The ICL32xxE directly interfaces with 5V CMOS and TTL logic families. The AC, HC, and CD4000 outputs can
drive the ICL32xxE inputs with the ICL32xxE at 3.3V and the logic supply at 5V, but ICL32xxE outputs do not
reach the minimum VIH for these logic families. See Tabl e 7 for more information.
Figure 21. Transmitter Loopback Test Circuit
Figure 22. Loopback Test at 250kbps (CL = 1000pF) Figure 23. Loopback Test at 1Mbps (CL = 250pF)
Table 7. Logic Family Compatibility with Various Supply Voltages
System Power-Supply
Voltage (V) VCC Supply Voltage (V) Compatibility
3.3 3.3 Compatible with all CMOS families.
5 5 Compatible with all TTL and CMOS logic families.
5 3.3 Compatible with ACT and HCT CMOS, and with TTL. ICL32xxE outputs are
incompatible with AC, HC, and CD4000 CMOS inputs.
ICL32xxE
VCC
C1
C2C4
C3
+
+
+
+
CL
V+
V-
5k
TIN
ROUT
C1+
C1-
C2+
C2-
RIN
TOUT
+
VCC
0.1µF
VCC
FORCEOFF
FORCEON
T1IN
T1OUT
R1OUT
2µs/Div
VCC = +3.3V
5V/Div
C1 - C4 = 0.1µF
T1IN
T1OUT
R1OUT
0.5µs/Div
5V/Div
VCC = +3.3V
C1 - C4 = 0.1µF
ICL3225E, ICL3227E, ICL3245E 5. ±15kV ESD Protection
FN4900 Rev.13.00 Page 22 of 28
May.2.19
5. ±15kV ESD Protection
All pins on the ICL32xxE devices include ESD protection structures, but the ICL32xxE family incorporates
advanced structures that allow the RS-232 pins (transmitter outputs and receiver inputs) to survive ESD events
up to ±15kV. The RS-232 pins are particularly vulnerable to ESD damage because they typically connect to an
exposed port on the exterior of the finished product. Touching the port pins, or connecting a cable, can cause an
ESD event that might destroy unprotected ICs. The ESD structures protect the device whether or not it is powered
up, protect without allowing any latchup mechanism to activate, and do not interfere with RS-232 signals as large
as ±25V.
5.1 Human Body Model (HBM) Testing
The Human Body Model (HBM) test method emulates the ESD event delivered to an IC during human handling.
The tester delivers the charge through a 1.5kΩ current limiting resistor, so the test is less severe than the
IEC61000 test, which uses a 330Ω limiting resistor. The HBM method determines an IC’s ability to withstand the
ESD transients typically present during handling and manufacturing. Due to the random nature of these events,
each pin is tested with respect to all other pins. The RS-232 pins on “E” family devices can withstand HBM ESD
events to ±15kV.
5.2 IEC61000-4-2 Testing
The IEC61000 test method applies to finished equipment, rather than to an individual IC. Therefore, the pins most
likely to suffer an ESD event are those that are exposed to the outside world (the RS-232 pins in this case), and
the IC is tested in its typical application configuration (power applied) rather than testing each pin-to-pin
combination. The lower current limiting resistor coupled with the larger charge storage capacitor yields a test that
is much more severe than the HBM test. The extra ESD protection built into this device’s RS-232 pins allows the
design of equipment meeting Level 4 criteria without the need for additional board level protection on the RS-232
port.
5.3 Air-Gap Discharge Test Method
For the air-gap discharge test method, a charged probe tip moves toward the IC pin until the voltage arcs to it.
The current waveform delivered to the IC pin depends on factors such as approach speed, humidity, and
temperature, so it is difficult to obtain repeatable results. The “E” device RS-232 pins withstand ±15kV air-gap
discharges.
5.4 Contact Discharge Test Method
During the contact discharge test, the probe contacts the tested pin before the probe tip is energized, and
eliminates the variables associated with the air-gap discharge. The result is a more repeatable and predictable
test, but equipment limits prevent testing devices at voltages higher than ±8kV. All “E” family devices survive ±8kV
contact discharges on the RS-232 pins.
ICL3225E, ICL3227E, ICL3245E 6. Die Characteristics
FN4900 Rev.13.00 Page 23 of 28
May.2.19
6. Die Characteristics
Substrate Potential (Powered Up) GND
Transistor Count ISL3225E: 937
ISL3227E: 825
ISL3245E: 1109
Process Si Gate CMOS
ICL3225E, ICL3227E, ICL3245E 7. Revision History
FN4900 Rev.13.00 Page 24 of 28
May.2.19
7. Revision History
Rev. Date Description
13 May.2.19 Updated to latest formatting.
Updated Ordering information table by adding active tape and reel information, updated notes, and removed
retired parts
Added “Charge Pump Abs Max Ratings” on page 12.
Removed About Intersil section.
Removed PDIP, TSSOP, and SOIC information throughout document.
Updated disclaimer.
12 Dec.12.15 Updated entire datasheet applying Intersil’s new standards.
Updated Ordering information table on page 2.
-Updated Tape and Reel note.
-Updated Note 2.
-Added MSL note.
-Removed all non-compliant products.
In the “Electrical Specifications” table under “ESD Performance” on page 9, Updated All Other pins section by
changing typical value for the ICL3245E from “±3” to “±2” and adding ICL3225E and ICL3227E information.
11 Dec.3.15 Updated Ordering Information Table on page 2: Added replacement part numbers for ICL3245ECBZ and
ICL3245ECVZ.
10 Aug.31.15 Ordering Information Table on page 2.
Added Revision History.
Added About Intersil Verbiage.
Updated POD M28.3 to latest revision changes: Added land pattern.
ICL3225E, ICL3227E, ICL3245E 8. Package Outline Drawings
FN4900 Rev.13.00 Page 25 of 28
May.2.19
8. Package Outline Drawings
Notes:
1. Symbols are defined in the “MO Series Symbol List” in Section 2.2 of
Publication Number 95.
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
3. Dimension “D” does not include mold flash, protrusions or gate burrs.
Mold flash, protrusion and gate burrs shall not exceed 0.20mm (0.0078
inch) per side.
4. Dimension “E” does not include interlead flash or protrusions. Interlead
flash and protrusions shall not exceed 0.20mm (0.0078 inch) per side.
5. The chamfer on the body is optional. If it is not present, a visual index
feature must be located within the crosshatched area.
6. “L” is the length of terminal for soldering to a substrate.
7. “N” is the number of terminal positions.
8. Terminal numbers are shown for reference only.
9. Dimension “B” does not include dambar protrusion. Allowable dambar
protrusion shall be 0.13mm (0.005 inch) total in excess of “B”
dimension at maximum material condition.
10. Controlling dimension: MILLIMETER. Converted inch dimensions are
not necessarily exact.
INDEX
AREA
E
D
N
123
-B-
0.25(0.010) C AMBS
e
-A-
L
B
M
-C-
A1
A
SEATING PLANE
0.10(0.004)
C
H0.25(0.010) BM M
0.25
0.010
GAUGE
PLANE
A2
For the most recent package outline drawing, see M16.209.
ICL3225E, ICL3227E, ICL3245E 8. Package Outline Drawings
FN4900 Rev.13.00 Page 26 of 28
May.2.19
INDEX
AREA
E
D
N
123
-B-
0.25(0.010) C A
MBS
e
-A-
B
M
-C-
A1
A
SEATING PLANE
0.10(0.004)
C
H0.25(0.010) B
MM
L
0.25
0.010
GAUGE
PLANE
A2
For the most recent package outline drawing, see M20.209.
ICL3225E, ICL3227E, ICL3245E 8. Package Outline Drawings
FN4900 Rev.13.00 Page 27 of 28
May.2.19
Notes:
1. Symbols are defined in the “MO Series Symbol List” in Section 2.2
of Publication Number 95.
2. Dimensioning and tolerancing per ANSI Y14.5M-1982.
3. Dimension “D” does not include mold flash, protrusions or gate
burrs. Mold flash, protrusion and gate burrs shall not exceed
0.20mm (0.0078 inch) per side.
4. Dimension “E” does not include interlead flash or protrusions.
Interlead flash and protrusions shall not exceed 0.20mm (0.0078
inch) per side.
5. The chamfer on the body is optional. If it is not present, a visual
index feature must be located within the crosshatched area.
6. “L” is the length of terminal for soldering to a substrate.
7. “N” is the number of terminal positions.
8. Terminal numbers are shown for reference only.
9. Dimension “B” does not include dambar protrusion. Allowable
dambar protrusion shall be 0.13mm (0.005 inch) total in excess of
“B” dimension at maximum material condition.
10. Controlling dimension: MILLIMETER. Converted inch dimensions
are not necessarily exact.
INDEX
AREA
E
D
N
123
-B-
0.25(0.010) C AMBS
e
-A-
L
B
M
-C-
A1
A
SEATING PLANE
0.10(0.004)
C
H0.25(0.010) BM M
0.25
0.010
GAUGE
PLANE
A2
M28.209 (JEDEC MO-150-AH ISSUE B)
28 Lead Shrink Small Outline Plastic Package (SSOP)
SYMBOL
INCHES MILLIMETERS
NOTESMIN MAX MIN MAX
A - 0.078 - 2.00 -
A1 0.002 - 0.05 - -
A2 0.065 0.072 1.65 1.85 -
B 0.009 0.014 0.22 0.38 9
C 0.004 0.009 0.09 0.25 -
D 0.390 0.413 9.90 10.50 3
E 0.197 0.220 5.00 5.60 4
e 0.026 BSC 0.65 BSC -
H 0.292 0.322 7.40 8.20 -
L 0.022 0.037 0.55 0.95 6
N28 287
0° 8° 0° 8° -
Rev. 2 6/05
For the most recent package outline drawing, see M28.209.
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