General Description
The MAX13223E is a +3.0V to +5.5V-powered EIA/TIA-232
and V.28 communications interface with fault protection
on the RS-232 line interface. This allows shorts of the
transmitter outputs and receiver inputs to voltages in the
±70V range without adversely affecting the MAX13223E.
The MAX13223E achieves 1μA supply current using
Maxim’s AutoShutdown™ feature. The MAX13223E
automatically enters a low-power shutdown mode when
the RS-232 cable is disconnected or the receivers
are inactive. The device turns on again when a valid
transition at any receiver input is sensed. A proprietary,
high-efficiency, dual charge-pump power supply and a
low-dropout transmitter combine to deliver true RS-232
performance from a single +3.0V to +5.5V supply.
The MAX13223E has two receivers and two drivers and is
guaranteed to run at data rates of 250kbps for one trans-
mitter switching while maintaining RS-232 output levels.
The MAX13223E operates from input voltages ranging from
+3.0V to +5.5V and is available in a 20-pin, 6.5mm x 4.4mm,
TSSOP package. The MAX13223E is specified over the
-40°C to +85°C temperature range.
Applications
Telematics Equipment
Base Stations
Utility Meters
Industrial Equipment
Telecomm Equipment
POS Terminal Equipment
Benets and Features
Robust Protection to Withstand Load Dumps,
Miswiring, and Connector Failures
±70V Fault Protection
Overvoltage Current Limiting
Current Protection at Transmitter Outputs
Thermal Shutdown Protection
Flexible Power Requirements Simplify Design
+3.0V to +5.5V Single Supply Voltage
True RS-232 Performance (Up to 250kbps) Even
from +3.0V Supply Voltage
AutoShutdown Simplifies Power Savings
Automatically Enters Shutdown Mode if RS-232
Cable is Disconnected or Receivers are Inactive
Automatically Activates from Shutdown When Any
Valid Transition is Sensed
1µA Typical Shutdown Current
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
19-4585; Rev 3; 2/15
+Denotes a lead(Pb)-free/RoHS-compliant package.
PART TEMP RANGE PIN-PACKAGE
MAX13223EEUP+ -40°C to +85°C20 TSSOP
MAX13223E
FORCEON
EN
R2OUT
R1OUT
FORCEOFF
INVALID
R2IN
GND
RS-232
OUTPUTS
TTL/CMOS
INPUTS T2IN
T1IN
R1IN
T2OUT
T1OUT
V-
V+
VCC
VCC
VCC
RS-232
INPUTS
TO POWER-
MANAGEMENT
UNIT
TTL/CMOS
OUTPUTS
C3
CBYPASS
0.1µF
C4
5k
5k
C2-
C2+
C2
C1-
C1+
C1
MAX13223E ±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
Typical Operating Circuit
Ordering Information
(Voltages referenced to GND.)
VCC .......................................................................-0.3V to +7.0V
V+ .........................................................................-0.3V to +7.0V
V- .........................................................................+0.3V to -7.0V
V+ to V- ..............................................................................+13V
Input Voltages
T1IN, T2IN, EN, FORCEON, FORCEOFF ...... -0.3V to +6.0V
R1IN, R2IN .....................................................................±70V
Output Voltages
T1OUT, T2OUT ..............................................................±70V
R1OUT, R2OUT, INVALID ....................... -0.3V to (VCC + 0.3V)
Short-Circuit Duration
T1OUT, T2OUT ......................................................Continuous
Continuous Power Dissipation (TA = +70°C)
TSSOP (derate 13.6mW/°C above +70°C) ..............1084mW
Operating Temperature Range .......................... -40°C to +85°C
Junction Temperature ...................................................... +150°C
Storage Temperature Range ........................... -65°C to +150°C
Lead Temperature (soldering, 10s) ................................. +300°C
Soldering Temperature (reflow) ....................................... +260°C
TSSOP
Junction-to-Ambient Thermal Resistance (θJA) .......73.8°C/W
Junction-to-Case Thermal Resistance (θJC) ...............20°C/W
(Note 1)
(VCC = +3.0V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C, unless other-
wise noted. For VCC = +3.0V to +3.6V, C1 = C2 = C3 = 0.1μF, C4 = 1μF. For VCC = +4.5V to +5.5V, C1 = 47nF, C2 = C3 = 330nF,
C4 = 1μF.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage VCC 3.0 5.5 V
Supply Current AutoShutdown disabled (FORCEON =
FORCEOFF = VCC), no load 8 15 mA
Supply Current AutoShutdown IASD
FORCEON = GND, FORCEOFF = VCC,
R1IN and R2IN idle, T1IN and T2IN idle 1.0 10 µA
Supply Current Shutdown ISD FORCEOFF = GND 1.0 10 µA
LOGIC INPUTS
Input-Logic Low VT_IN,LO
T_IN, EN, FORCEON, FORCEOFF,
VCC = +3.3V to +3.6V, +5.0V to +5.5V 0.8 V
Input-Logic High VT_IN,HI
T_IN, FORCEON,
FORCEOFF, EN
VCC = +3.3V 2.0 V
VCC = +5.0V 2.4
Transmitter Input Hysteresis VTX,INHYS 0.5 V
Input Leakage Current IIN,LKG T_IN, EN, FORCEON, FORCEOFF ±0.01 ±1 µA
RECEIVER OUTPUTS
Output Leakage Current IRX,OUT,LKG EN = VCC ±0.05 ±10 µA
Output-Voltage Low VRX,OUT,LO IOUT = 1.6mA 0.4 V
Output-Voltage High VRX,OUT,HI IOUT = -1.0mA VCC -
0.6
VCC -
0.2 V
MAX13223E ±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
www.maximintegrated.com Maxim Integrated
2
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Thermal Characteristics
Electrical Characteristics
(VCC = +3.0V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C, unless other-
wise noted. For VCC = +3.0V to +3.6V, C1 = C2 = C3 = 0.1μF, C4 = 1μF. For VCC = +4.5V to +5.5V, C1 = 47nF, C2 = C3 = 330nF,
C4 = 1μF.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
INVALID OUTPUT (AutoShutdown (FORCEON = GND, FORCEOFF = VCC))
Receiver-Input Level to INVALID
Output High
VRX_IN,
INV_HI
Figure 6a Positive level 2.7 V
Negative level -2.7
Receiver-Input Level to INVALID
Output Low
VRX_IN,
INV_LO
Figure 6a -0.3 +0.3 V
INVALID Output-Voltage Low VRX,INV_LO IOUT = 1.6mA 0.4 V
INVALID Output-Voltage High VRX,INV_HI IOUT = -1.0mA VCC -
0.6 V
RECEIVER INPUTS
Input-Voltage Range VRX,IN (Note 3) -70 +70 V
Overvoltage Threshold |VRX,OVTHR| 24 28.3 32 V
Input Threshold Low VRX,LO
VCC = +3.3V 0.6 V
VCC = +5.0V 0.8
Input Threshold High VRX,HI
VCC = +3.3V 2.4 V
VCC = +5.0V 2.4
Input Resistance RRX,INRES
-24V < VR_IN < +24V (Note 3) 3 5 7
kΩVCC = V+ = V- = 0V 35 250
+32V < |VR_IN| < +70V 35 250
TRANSMITTER OUTPUTS
Output-Voltage Swing VORL = 3kΩ, Figure 4 ±5 ±6 V
Output Resistance RTX,ROUT VCC = V+ = V- = 0V, VT_OUT = ±2V 300
Overvoltage Protection Threshold |VTX,FB| 14 19 V
Output Short-Circuit Current ITX,SHORT T_OUT = GND ±80 mA
Overvoltage Current ITX,IFBOUT
VT_OUT > VTX,FB 6mA
VT_OUT < -VTX,FB -6
Output Leakage Current in
Shutdown Mode ITX,LKG
VT_OUT = +12V 450 900
µA
VT_OUT = -12V, VCC = 0V, or +3V to +5.5V in
shutdown mode -150 -80
PROTECTION
Overvoltage Protection Range R1IN, R2IN, T1OUT, T2OUT -70 +70 V
ESD PROTECTION (Note 4)
R1IN, R2IN, T1OUT, T2OUT IEC 6100-4-2 Contact Discharge ±8
kVHuman Body Model ±8
All Other Pins Human Body Model ±2
MAX13223E ±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
www.maximintegrated.com Maxim Integrated
3
Electrical Characteristics (continued)
(VCC = +3.0V to +5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C, unless other-
wise noted. For VCC = +3.0V to +3.6V, C1 = C2 = C3 = 0.1μF, C4 = 1μF. For VCC = +4.5V to +5.5V, C1 = 47nF, C2 = C3 = 330nF,
C4 = 1μF.) (Note 2)
Note 2:
All devices are 100% production tested at TA = +85°C. Specifications are over -40°C to +85°C and are guaranteed by design.
Note 3: Both receivers will operate over the ±70V input range. The input resistance increases with input voltage. The input resis-
tance will increase within 24V |VR_IN| ≤ 32V.
Note 4: Guaranteed by design, not production tested.
Note 5: Transmitter skew is measured at the transmitter zero crosspoints.
Note 6: Output recovery time is the delayed time for the transmitter to enter normal operating mode after an overvoltage condition.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Maximum Data Rate DR RL = 3kΩ, CL = 1000pF, one transmitter
switching, Figure 1 250 kbps
Receiver Positive or Negative
Threshold to INVALID High tINVH VCC = 5V, Figure 6b 1 µs
Receiver Positive or Negative
Threshold to INVALID Low tINVL VCC = 5V, Figure 6b 30 µs
Receiver Edge to Transmitters
Enabled tWU VCC = 5V, Figure 6b 135 µs
Receiver-Output Enable Time tRX,EN Normal operation 200 ns
Receiver-Output Disable Time tRX,DIS Normal operation 200 ns
Receiver Skew |tPRHL - tPRLH| 50 ns
Transmitter Skew |tPTHL - tPTLH| (Note 5) 200 ns
Receiver Propagation Delay tPRHL CL = 150pF, Figure 4 0.3 µs
tPRLH 0.3
Transmitter Propagation Delay tPTHL CL = 1nF, RL = 3kΩ, Figure 3 0.8 µs
tPTLH 0.6
Transmitter Fall Time or Rise
Time tR, tFFigure 3 0.3 µs
Transmitter Time to Exit
Shutdown tSHDN Figure 7 100 µs
Output Recovery Time tTX,REC CL = 1nF, RL = 5k (Note 6) 100 µs
Transition-Region Slew Rate SROUT
VCC = +3.3V, RL = 3kΩ to 7kΩ, TA = +25ºC,
measured from +3V to -3V or -3V to +3V, one
transmitter switching, CL = 1nF
6 30 V/µs
MAX13223E ±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
www.maximintegrated.com Maxim Integrated
4
Timing Characteristics
Figure 1. Driver Test Circuit
Figure 3. Driver Propagation Delay
Figure 4. Receiver Propagation Delay
Figure 2. Receiver Test Circuit
CLRL
VO
T_IN T_OUT
0
tPTHL
0
V0
-V0
T_IN
T_OUT
-3V
3V
tFtR
0
3V
-3V
VCC/2
tPTLH
VCC/2
VCC
tPRHL tPRLH
1.3V 1.7V
VCC/2 VCC/2
VIL
V0H
V0L
R_IN
R_OUT
VIH
tR, tF 10ns
T_IN T_OUT R_IN R_OUT
15pF
MAX13223E ±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
www.maximintegrated.com Maxim Integrated
5
Test Circuits
Timing Diagrams
(TA = +25°C, unless otherwise noted.)
0
22
20
18
16
14
12
10
8
6
4
2
0 5000
SLEW RATE
vs. LOAD CAPACITANCE
MAX13223E toc02
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
20001000 3000 4000
+ SLEW
- SLEW
0
10
5
25
20
15
40
35
30
45
0 20001000 3000 4000 5000
OPERATING SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX13223E toc03
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
250kbps
120kbps
20kbps
T1 TRANSMITTING AT 250kbps
T2 TRANSMITTING AT 15.6kbps
TRANSMITTER TIME
TO EXIT SHUTDOWN
MAX13223E toc04
40µs/div
5V/div
2V/div
T2OUT
T1OUT
VCC = +3.3V
C1–C4 = 0.1µF
FORCEON =
FORCEOFF
-8
-6
-4
-2
0
2
4
6
8
0 1000 2000 3000 4000 5000
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX13223E toc01
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
VOUT+
VOUT-
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
VCC
GND
T1OUT
C1-
V+
C1+
R1IN
R1OUT
FORCEON
T1IN
T2OUT
V-
C2-
C2+
12
11
9
10
T2IN
R2OUT
R2IN
TSSOP
MAX13223E
INVALID
FORCEOFF
EN
TOP VIEW
MAX13223E ±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
Maxim Integrated
6
www.maximintegrated.com
Typical Operating Characteristics
Pin Conguration
Detailed Description
Figure 2 shows the receiver test circuit. Figure 3 shows
driver propagation delay and Figure 4 shows receiver
propagation delay.
Dual Charge-Pump Voltage Converter
The MAX13223E internal power supply consists of a
dual-mode regulated charge pump that provides output
voltages of +5.5V (doubling charge pump) and -5.5V
(inverting charge pump), regardless of the input voltage
(VCC) over the +3.0V to +5.5V range. The charge pumps
operate in a discontinuous mode. If the output voltages
are less than 5.5V, the charge pumps are enabled. If the
output voltages exceed 5.5V, the charge pumps are dis-
abled. Each charge pump requires a flying capacitor (C1,
C2) and a reservoir capacitor (C3, C4) to generate the V+
and V- supplies.
RS-232 Transmitters
The transmitters are inverting level translators that convert
logic levels to EIA/TIA-232/V.28 levels. They guarantee a
250kbps data rate with worst-case loads of 3kΩ in paral-
lel with 1000pF, providing compatibility with PC-to-PC
communication software. The MAX13223E can operate
at data rates of 250kbps (max). Transmitters can be par-
alleled to drive multiple receivers. When FORCEOFF is
driven to ground, or the AutoShutdown circuitry senses
invalid voltage levels at all receiver inputs, the transmitters
are disabled and the outputs are forced into a high-imped-
ance state. Figure 5 shows a complete system connection.
RS-232 Receivers
The MAX13223E’s receivers convert RS-232 signals to
logic output levels. Both receiver outputs can be three-
stated using the EN input. In shutdown (FORCEOFF or
AutoShutdown), the MAX13223E’s receiver outputs are
active and asserted low if EN = Low (Table 1). Driving EN
high places the receivers’ outputs in a high-impedance
state.
PIN NAME FUNCTION
1EN Receiver Enable Control Input. Drive EN low for normal operation. Drive EN high to force the receiver outputs
(R1OUT, R2OUT) into a high-impedance state.
2 C1+ Positive Terminal of the Voltage Doubler Charge-Pump Capacitor
3 V+ +5.5V Generated by Charge Pump
4 C1- Negative Terminal of the Voltage Doubler Charge-Pump Capacitor
5 C2+ Positive Terminal of Inverting Charge-Pump Capacitor
6 C2- Negative Terminal of Inverting Charge-Pump Capacitor
7V- -5.5V Generated by Charge Pump
8 T2OUT RS-232 Transmitter 2 Output
9 R2IN RS-232 Receiver 2 Input
10 R2OUT Receiver 2 Logic Output
11 INVALID Valid Signal Detector Output. INVALID is high if a valid RS-232 level is present on any receiver input.
12 T2IN Transmitter 2 Logic Input
13 T1IN Transmitter 1 Logic Input
14 FORCEON Active-High FORCEON Input. Drive FORCEON high to override AutoShutdown, keeping transmitters and
charge pump on (FORCEOFF must be high).
15 R1OUT Receiver 1 Logic Output
16 R1IN RS-232 Receiver 1 Input
17 T1OUT RS-232 Transmitter 1 Output
18 GND Ground
19 VCC
+3.0V to +5.5V Supply Voltage. Bypass VCC with a 0.1µF ceramic capacitor located as close to the device
as possible.
20 FORCEOFF Active-Low FORCEOFF Input. Drive FORCEOFF low to shut down transmitters, receivers, and on-board
charge pumps, overriding AutoShutdown and FORCEON.
MAX13223E ±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
www.maximintegrated.com Maxim Integrated
7
Pin Description
AutoShutdown
The MAX13223E achieves 1μA supply current with
Maxim’s AutoShutdown feature, which operates when
FORCEON is low and FORCEOFF is high. When the
device senses no valid signal levels on both receiver
inputs for > 30μs (typ), the onboard charge pump and
drivers are shut off, reducing supply current to 1μA. This
occurs if the RS-232 cable is disconnected or the connect-
ed peripheral transmitters are turned off. The device turns
on again when a valid level is applied to either RS-232
receiver input. As a result, the system saves power.
Table 2 summarizes the MAX13223E’s operating modes.
FORCEON and FORCEOFF override AutoShutdown.
When neither control is asserted, the IC selects between
these states automatically, based on receiver input levels.
Figure 6a shows the input levels and Figure 6b shows the
timing diagram for AutoShutdown operation.
Software-Controlled Shutdown
If direct software control is desired, INVALID can
be used to indicate a DTR or Ring indicator signal.
Connect FORCEOFF and FORCEON together to bypass
AutoShutdown; therefore, the line acts as a SHDN input.
Table 1. Receiver Control Truth Table
Figure 5. Interface Under Control of PMU
Figures 6a and 6b. Trip Levels for Entering and Exiting
AutoShutdown
EN OPERATION MODE R_OUT
0Active (FORCEON), or
Active (AutoShutdown) Active
0Shutdown (FORCEOFF), or
Shutdown (AutoShutdown)
Active and asserted
low
1 Shutdown status is don’t care High impedance
MAX13223E
UART
FORCEON
FORCEOFF
POWER-
MANAGEMENT
UNIT OR CPU INVALID
RS-232
RECEIVER INPUT
AutoShutdown, TRANSMITTER DISABLED,
1µA SUPPLY CURRENT
-2.7V
b)
a)
-0.3V
+2.7V
+0.3V
0
INDETERMINATE
INDETERMINATE
TRANSMITTER ENABLED, INVALID HIGH
TRANSMITTER ENABLED, INVALID HIGH
tINVL tINVH
tWU
V+
V-
0
+2.7V
+0.3V
-0.3V
-2.7V
0
VCC
VCC
RECEIVER
INPUT
VOLTAGE
(V)
INVALID
OUTPUT
(V)
INVALID
REGION
MAX13223E ±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
www.maximintegrated.com Maxim Integrated
8
Applications Information
Capacitor Selection
The capacitor type used for C1–C4 is not critical for prop-
er operation; either polarized or nonpolarized capacitors
may be used. The charge pump requires 0.1μF capaci-
tors for 3.3V operation. For other supply voltages, see
Table 3 for required capacitor values. Do not use values
smaller than those listed in Table 3. Increasing the capaci-
tor values (e.g., by a factor of 2) reduces ripple on the
transmitter outputs and slightly reduces power consump-
tion. C2, C3, and C4 can be increased without changing
C1’s value. However, do not increase C1 without also
increasing the values of C2, C3, and C4 to maintain
the proper ratios (C1 to the other capacitors). When
using the minimum required capacitor values, make sure
the capacitor value does not degrade excessively with
temperature. If in doubt, use capacitors with a larger nom-
inal value. The capacitor’s equivalent series resistance
(ESR) usually rises at low temperatures and influences
the amount of ripple on V+ and V-.
Power-Supply Decoupling
In most circumstances, a 0.1μF VCC bypass capacitor is
adequate. In applications that are sensitive to power-sup-
ply noise, decouple VCC to ground with a capacitor of the
same value as the charge-pump capacitor C1. Connect
bypass capacitors as close to the IC as possible.
Transmitter Outputs when
Exiting Shutdown
Figure 7 shows two transmitter outputs when exiting shut-
down mode. As they become active, the two transmitter
outputs are shown going to opposite RS-232 levels. Each
transmitter is loaded with 3kΩ in parallel with 2500pF.
The transmitter outputs display no ringing or undesirable
transients as they come out of shutdown. Note that the
transmitters are enabled only when the magnitude of
V- exceeds approximately 3V.
Table 2. AutoShutdown Control
Table 3. Required Capacitor Values
X = Don’t Care.
Figure 7. Transmitter Outputs when Exiting Shutdown or
Powering Up
INPUTS OUTPUTS
FORCEOFF FORCEON Valid receiver input level INVALID
OUTPUT OPERATION MODE T_OUT
0 X No 0 Shutdown (Forced Off) High-Z
0 X Yes 1 Shutdown (Forced Off) High-Z
1 0 No 0 Shutdown (AutoShutdown) High-Z
1 0 Yes 1 Active (AutoShutdown) Active
1 1 No 0 Active (Forced On) Active
1 1 Yes 1 Active (Forced On) Active
VCC (V) C1, CBYPASS (µF) C2, C3 (µF) C4 (µF)
3.0 to 3.6 0.1 0.1 1
4.5 to 5.5 0.047 0.33 1
40µs/div
5V/div
2V/div
T2OUT
T1OUT
VCC = +3.3V
C1–C4 = 0.1µF
FORCEON =
FORCEOFF
MAX13223E ±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
www.maximintegrated.com Maxim Integrated
9
Fault Protection
The MAX13223E is designed to survive faults such as
direct shorts to power supplies, miswiring faults, connec-
tor failures, and tool misapplications of the transmitter
outputs and receiver inputs to voltages in the ±70V range
without damage. This fault protection is applicable in all
modes of the MAX13223E: active, shutdown, and pow-
ered down. Both receivers operate over the ±70V input
range, but the termination resistor (RRX,I) increases when
|VR_IN| voltage exceeds ±32V. A receiver’s input termina-
tion resistor reduces to its nominal value if the input volt-
age reduces to within the ±24V range. The receiver inputs
and transmitter outputs are independently fault protected.
±8kV ESD Protection
As with all Maxim devices, ESD-protection structures are
incorporated on all pins to protect against electrostatic
discharges encountered during handling and assembly.
In using the MAX13223E, C4 must be a 1μF capacitor
for the extended ESD protection. The driver outputs and
receiver inputs of the MAX13223E have extra protec-
tion against static electricity. Maxim’s engineers have
developed state-of-the-art structures to protect these
pins against ESD of ±8kV without damage. The ESD
structures withstand high ESD in all states: normal
operation, shutdown, and powered down. After an ESD
event, Maxim’s E versions keep working without latchup,
whereas competing RS-232 products can latch and must
be powered down to remove latchup. ESD protection can
be tested in various ways. The transmitter outputs and
receiver inputs of this product family are characterized for
protection to the following limits:
1) ±8kV using the Human Body Model
2) ±8kV using the Contact-Discharge Method specified in
IEC 61000-4-2
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents test
setup, test methodology, and test results.
Human Body Model
Figure 8a shows the Human Body Model and Figure
8b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of a
100pF capacitor charged to the ESD voltage of interest,
which is then discharged into the test device through a
1.5kΩ resistor.
IEC 61000-4-2
The IEC 61000-4-2 standard covers ESD testing and
performance of finished equipment. It does not specifically
refer to integrated circuits. The major difference between
tests done using the Human Body Model and IEC 61000-4-
2 is higher peak current in IEC 61000-4-2, because series
resistance is lower in the IEC 61000-4-2 model. Hence,
the ESD withstand voltage measured to IEC 61000-4-2
is generally lower than that measured using the Human
Body Model. Figure 9a shows the IEC 61000-4-2 model
and Figure 9b shows the current waveform for the ±8kV,
IEC 61000-4-2, level 4, ESD Contact-Discharge Method.
Figure 8a. Human Body ESD Test Model
Figure 8b. Human Body Current Waveform
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
100pF
RC
1M
RD
1500
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
IP 100%
90%
36.8%
tRL TIME
tDL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
Ir
10%
0
0
AMPERES
MAX13223E ±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
www.maximintegrated.com Maxim Integrated
10
Figure 9a. IEC 61000-4-2 ESD Test Model
Figure 9b. IEC 61000-4-2 ESD Generator Current Waveform
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
20 TSSOP U20+2 21-0066 90-0116
CHARGE CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
150pF
RC
50M to 100M
RD
330
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
tr = 0.7ns to 1ns
30ns
60ns
t
100%
90%
10%
IPEAK
I
MAX13223E ±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
www.maximintegrated.com Maxim Integrated
11
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
Chip Information
PROCESS: CMOS
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 4/09 Initial release
1 2/11
Added soldering information to the Absolute Maximum Ratings section; updated the
Electrical Characteristics globals information for C1 = C2 = C3 = 0.1µF and C2 =
C3 = 330nF; corrected the reference of VOUT to VT_OUT for the overvoltage current
parameter in the Electrical Characteristics table; added R_OUT to Figure 2; updated
the RS-232 Receivers section description and Table 1; added the land pattern no. to
the Package Information table
2, 3, 4, 5, 7,
8, 11
2 11/14 Removed automotive reference in Applications section 1
3 2/15 Added the Benets and Features section 1
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
MAX13223E ±70V Fault-Protected, 3.0V to 5.5V,
2Tx/2Rx RS-232 Transceiver
© 2015 Maxim Integrated Products, Inc.
12
Revision History
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