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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com SP202E,232E,233E, 310E, 312E_101_060311
DESCRIPTION
FEATURES
SP202E,SP232E, SP233E, SP310E and SP312E
High Performance RS-232 Line Drivers/Receivers
• Operates from a Single +5V Power Supply
• Meets all RS-232D and ITU V.28 Specications
• Operates with 0.1μF to 10μF Ceramic Capacitors
• No External Capacitors required (SP233E)
• Low Power Shutdown (SP310E, SP312E)
• High Data Rate - 120kbps under load
• Low power CMOS Operation
• Lead Free packaging available
• Improved ESD Specications:
+/-15kV Human Body Model
The SP202E, SP232E, SP233E, SP310E and SP312E devices are a family of line driver and re-
ceiver pairs that meets the specications of RS-232 and V.28 serial protocols. The devices are pin-
to-pin compatible with Exar's SP232A, SP233A, SP310A and SP312A devices as well as popular
industry standard pinouts. The ESD tolerance has been improved on these devices to over +/-15kV
for Human Body Model. This series offer a 120kbps data rate under load, small ceramic type 0.1μF
charge pump capacitors and overall ruggedness for comercial applications. Features include Exar's
BiCMOS design which allowing low power operation without sacricing performance. The series is
available in lead free packages with commercial and industrial temperature ranges.
SELECTION TABLE
Model Number of RS-232 No. of RX
active in
Shutdown
No. of External
0.1μF Capacitors Shutdown WakeUp TTL Tri-State
Drivers Receivers
SP202E 2 2 0 4 No No No
SP232E 2 2 0 4 No No No
SP233E 2 2 0 0 No No No
SP310E 2 2 0 4 Yes No Yes
SP312E 2 2 2 4 Yes Yes Yes
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com SP202E,232E,233E, 310E, 312E_101_060311
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ABSOLUTE MAXIMUM RATINGS
This is a stress rating only and functional operation of
the device at these ratings or any other above those
indicated in the operation section of the specication
is not implied. Exposure to absolute maximum ratings
conditions for extended periods of time may affect re-
liability.
Supply Voltage (VCC)....................................................+ 6V
V+........................................................................... (Vcc-0.3V) to +11.0V
V- .............................................................................-11.0V
Input Voltages
Tin.....................................................-0.3V to (Vcc + 0.3V)
Rin............................................................................+/-15V
Output Voltages
Tout...............................................(V+, +0.3V) to (V-, -0.3V
Rout...................................................-0.3V to (Vcc + 0.3V)
Vcc = 5V ±10%, 0.1μF charge pump capacitors, Tmin to Tmax, unless otherwise noted, Typical values are Vcc =
5V and Ta=25°C
Short Circuit duration
Tout.....................................................Continuous
Package Power Dissipation:
Plastic DIP...............................................375mW
(derate 7mW/°C above +70°C)
Small Outline...........................................375mW
(derate 7mW/°C above +70°C)
Storage Temperature..................-65°C to +150°C
ELECTRICAL CHARACTERISTICS
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
TTL INPUT
Logic Threshold LOW Tin, En, SD, On/OFF 0.8 Volts
Logic Threshold HIGH Tin, En, SD, On/OFF 2.0 Volts
Logic Pull-Up Current Tin = 0V 15 200 μA
TTL OUTPUT
Output Voltge LOW iOuT = 3.2ma: Vcc = +5V 0.4 Volts
Output Voltage HIGH iOuT = -1.0ma 3.5 Volts
Leakage Current **; Ta = +25°C En = Vcc, 0V ≤ VOuT ≤ Vcc 0.05 +/-10 μA
RS-232 OUTPUT
Output Voltage Swing all Transmitter outputs loaded
with 3k ohms to GND +/-5.0 +/-6 Volts
Output Resistance Vcc = 0V, Vout = +/-2V 300 Ohms
Output Short Circuit Current Innite Duration +/-18 mA
Maximum Data Rate CL = 2500pF, RL = 3kΩ 120 240 kbps
RS-232 INPUT
Voltage Range -15 +15 Volts
Voltage Threshold LOW Vcc = 5V, Ta=25°C 0.8 1.2 Volts
Voltage Threshold HIGH Vcc = 5V, Ta=25°C 1.7 2.8 Volts
Hysteresis Vcc = 5V, Ta=25°C 0.2 0.5 1.0 Volts
Resistance Ta = 25°C, -15V ≤ Vin ≤ +15V 3 5 7
** SP310E and SP312E only
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com SP202E,232E,233E, 310E, 312E_101_060311
Parameter TEST CONDITIONS MIN TYP MAX Unit
DYNAMIC CHARACTERISTICS
Driver Propagation Delay TTL to RS-232; CL = 50pF 1.5 3.0 μs
Receiver Propagation Delay RS-232 to TTL 0.1 1.0 μs
Instantaneous Slew Rate CL = 10pF, RL = 3-7kΩ; TA= 25°C 30 V/μs
Transition Region Slew Rate
CL = 2500pF, RL = 3kΩ;
Measured from +3V to -3V or
-3V to +3V
10 V/μs
Output Enable Time ** SP310E and SP312E only 400 ns
Output Disable Time ** SP310A and SP312A only 250 ns
POWER REQUIREMENTS
Vcc Power Supply Current No Load, Vcc = 5V, TA= 25°C 3 5 mA
Vcc Power Supply Current, Loaded All Transmitters RL = 3kΩ,
Ta= 25°C 15 mA
Shutdown Supply Current ** Vcc = 5V, Ta= 25°C 1 5 μA
** SP310E and SP312E only
ELECTRICAL CHARACTERISTICS
Vcc = 5V ±10%, 0.1μF charge pump capacitors, Tmin to Tmax, unless otherwise noted, Typical values are Vcc =
5V and Ta=25°C
PERFORMANCE CURVES
0 2 4 6 8 10 12 14
Load Current (mA)
V– Voltage (Volts)
-3
-4
-5
-6
-7
-8
-9
-10
-11
VCC = 6V
VCC = 5V
VCC = 4V
-55 -40 0 25 70 85 125
Temperature ( C)
0
5
10
15
20
25
30
V
CC
= 6V
V
CC
= 5V
V
CC
= 4V
V
CC
= 3V
ICC (mA)
0 5 10 15 20
Load Current (mA)
0
6
8
10
12
V+ (Volts)
2
4
V
CC
= 5V
V
CC
= 4V
V
CC
= 6V
25 30 35 40
4.5 4.75 5.0 5.25 5.5
V
CC
(Volts)
5.0
6.5
7.0
7.5
8.0
8.5
9.0
Load current = 0mA
TA = 25C
VOH (Volts)
5.5
6.0
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com SP202E,232E,233E, 310E, 312E_101_060311
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PIN ASSIGNMENTS
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com SP202E,232E,233E, 310E, 312E_101_060311
DESCRIPTION
DETAILED DESCRIPTION
The SP202E, SP232E, SP233E, SP310E and
SP312A devices are a family of line driver and
receiver pairs that meet the EIA/TIA-232 and
V.28 serial communication protocols. The ESD
tolerance has been improved on these devices
to over +/-15kV for Human Body Model. These
devices are pin-to-pin compatible with Exar's
232A, 233A, 310A and 312A as well as popular
industry standards. This family of parts offer a
120kbps data rate, 10V/μs slew rate and an on-
board charge pump that operates from a single
5V supply using 0.1μF ceramic capacitors.
The SP202E, 232E, 233E, 310E and 312E de-
vices have internal charge pump voltage con-
verters which allow them to operate from a sin-
gle +5V supply. The charge pumps will operate
with polarized or non-polarized capacitors rang-
ing from 0.1 to 10µF and will generate the +/-6V
needed to generate the RS-232 output levels.
The SP233E design offers internal charge pump
capacitors. The SP310E provides an ON/OFF
input that simultaneously disables the internal
charge pump circuit and puts all transmitter and
receiver outputs into a high impedance state.
The SP312E is identical to the SP310E but with
seperate tri-state and shutdown inputs
Theory Of Operation
The SP202E, SP232E, SP233E, SP310E and
SP312E devices are made up of three basic
circuit blocks: 1. Drivers, 2. Receivers, and 3.
charge pump. Each block is described below.
Drivers
The drivers are inverting level transmitters that
convert TTL or CMOS logic levels to EIA/TIA-
232 levels with an inverted sense relative to
the input logic levels. The typical driver output
voltage swing is +/-6V. Even under worst case
loading conditions of 3k ohms and 2500pF, the
driver output is guaranteed to be +/-5.0V mini-
mum, thus satisfying the RS-232 specication.
The driver outputs are protected against innite
short-circuits to ground without degradation in
reliability.
The slew rate of the driver output is internally
limited to 30V/μs in order to meet the EIA stan-
dards (EIA-232F). Additionally, the driver out-
puts LOW to HIGH transition meets the mon-
tonic output requirements of the standard.
Receivers
The receivers convert EIA/TIA-232 signal lev-
els to inverted TTL or CMOS logic output lev-
els. Since the input is usually from a transmis-
sion line, where long cable length and system
interference can degrade the signal, the inputs
have a typical hysteresis margin of 500mV. This
ensures that the receiver is virtually immune to
noisy transmission lines. The input thresholds
are 0.8V minimum and 2.8V maximum, again
well within the +/-3V RS-232 requirements.
Should an input be left unconnected, an internal
5kohm pull-down resistor to ground will commit
the output of the receiver to a HIGH state.
In actual system applications, it is quite pos-
sible for signals to be applied to receiver inputs
before power is applied to the receiver circuitry.
This occurs, for example, when a PC user at-
tempts to print, only to realize that the printer
wasn't turned on. In this case an RS-232 signal
from the PC will appear on the receiver input
at the printer. When the printer power is turned
on, the receiver will operate normally. All of
these devices are fully protected.
Charge pump
The charge pump is an Exar patented design
and uses a unique approach compared to
older less efciant designs. The charge pump
requires 4 external capacitors and uses a four
phase voltage shifting technique. The internal
power supply consists of a dual charge pump
that provides a driver output voltage swing of
+/-6V. The internal oscillator controls the four
phases of the voltage shifting. A description of
each phase follows:
Phase 1
Vss charge store and double: The positive ter-
minals of capacitors C1 and C2 are charged
from Vcc with their negative terminals initially
connected to ground. C1+ is then connected
to ground and the stored charge from C1- is
superimposed onto C2-. Since C2+ is still con-
nected to Vcc the voltage potential across C2
is now 2 x Vcc.
Phase 2
Vss transfer and invert: Phase two connects
the negative terminal of C2 to the Vss storage
capacitor and the positive terminal of C2 to
ground. This transfers the doubled and invert-
ed (V-) voltage onto C4. Meanwhile, capacitor
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com SP202E,232E,233E, 310E, 312E_101_060311
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DESCRIPTION
C1 is charged from Vcc to prepare it for its next
phase.
Phase 3
Vdd charge store and double: Phase three is
identical to the rst phase. The positive termi-
nals of C1 and C2 are charged from Vcc with
their negative terminals initially connected to
ground. C1+ is then connected to ground and
the stored charge from C1- is superimposed
onto C2-. Since C2+ is still connected to Vcc
the voltage potential across capacitor C2 is now
2 x Vcc.
Phase 4
Vdd transfer: The fourth phase connects the
negative terminal of C2 to ground and the posi-
tive terminal of C2 to the Vdd storage capacitor.
This transfers the doubled (V+) voltage onto C3.
Meanwhile, capacitor C1 is charged from Vcc to
prepare it for its next phase.
The clock rate for the charge pump typically op-
erates at greater than 15kHz allowing the pump
to run efciently with small 0.1uF capacitors. Ef-
cient operation depends on rapid charging and
discharging of C1 and C2, therefore capacitors
should be mounted as close as possible to the
IC and have low ESR (equivalent series resis-
tance). Inexpensive surface mount, ceramic ca-
pacitors are ideal for using on charge pump. If
polarized capacitors are used the positive and
negative terminals should be connected as
shown in the typical operating circuit. A diagram
of the individual phases are shown in Figure 1.
Shutdown (SD) and Enable (EN) features for
the SP310E and SP312E
Both the SP310E and SP312E have a shutdown
/ standby mode to conserve power in battery-
powered applications. To activate the shutdown
mode, which stops the operation of the charge
pump, a logic "0" is applied to the appropriate
control line. For the SP310E, this control line is
the ON/OFF (pin 18) input. Activating the shut-
down mode puts the SP310E transmitter and
receiver ouptuts into a high impedance con-
dition. For the SP312E, this control line is the
SHUTDOWN (pin18) input; this also puts the
transmitter outputs in a tri-state mode. The re-
ceiver outputs can be tri-stated seperately dur-
ing normal operation or shutdown by applying a
logic "1" on the EN line (pin 1).
Wake-Up Feature for the SP312E
The SP312E has a wake-up feature that keeps
the receivers active when the device is placed
into shutdown. Table 1 denes the truth table for
the Wake-Up function. When only the receivers
are activated, the SP312E typically draws less
than 5uA supply current. In the case of when
a modem is interfaced to a computer in power
down mode, the Ring Indicator (RI) signal from
the modem would be used to "wake-up" the
computer, allowing it to accept data transmis-
sion.
After the ring indicator has propagated
through the SP312E receiver, it can be used
to trigger the power management circuitry of
the computer to power up the microproces-
sor, and bring the SD pin of the SP312E to a
logic high, taking it out of the shutdown mode.
The receiver propagation delay is typically
1us. The enable time for V+ and V- is typi-
cally 2ms. After V+ and V- have settled to their
nal values, a signal can be sent back to the
modem on the data terminal ready (DTR) pin
signifying that the computer is ready to accept
the transmit data.
SD
EN
Power
Up/Down
Receiver
outputs
0 0 Down Enabled
0 1 Down Tri-state
1 0 Up Enabled
1 1 Up Tri-state
Table 1. Wake-up Function truth table
Pin Strapping for the SP233E
To operate properly, the following pairs of pins
must be externally wired together as noted in
table 2:
Pins Wired
Together
SOICW
Two V- pins 10 & 17
Two C2+ pins 12 & 15
Two C- pins 11 & 16
Connect Pins 6 and 9 to
GND
Table 2. Pin Strapping table for SP233E
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com SP202E,232E,233E, 310E, 312E_101_060311
C
2
+
-
V
CC
C
3
C
4
C
1
+ +
+
e
-
e
-
Phases 1 and 3: Store/Double.
Double charge from C 1 onto C2.
C 2 is now charged to -2xVcc
+
C
2
+
-
V
CC
C
3
C
4
C
1
+ +
+
e
-
+
e
+
e
+
C
2
+
-
V
CC
C
3
C
4
C
1
+ +
+
Phase 2 – Vss transfer from C2 to C4.
Meanwhile C 1 is charged to Vcc
e
-
e
-
e
-
+
Vss
transfer from C2 to C3.
Meanwhile C1 is charged to Vcc
V
DD
V-
V+
V-
V+
V+
Patented 5,306,954
Phase 4 VDD
Figure 1. Charge pump phases
DESCRIPTION
ESD TOLERANCE
The SP202E, 232E, 233E, 310E and 312E
devices incorporates ruggedized ESD cells on
all driver outputs and receiver input pins. The
ESD structure is improved over our previous
family for more rugged applications and envi-
ronments sensitive to electro-static discharges
and associated transients. The improved ESD
tolerance is at least +/-15kV Human Body
Model without damage nor latch-up.
The Human Body Model has been the gener-
ally accepted ESD testing method for semi-
conductors. This method is also specied in
MIL-STD-883, Method 3015.7 for ESD testing.
The premise of this ESD test is to simulate
the human body's potential to store electro-
static energy and discharge it to an intergrated
circuit. The simulation is peformed by using a
test model as shown in gure 2. This method
will test the IC's capability to withstand an ESD
transient during normal handling such as in
manufacturing areas where the IC's tend to be
handled frequently.
Figure 2. ESD test circuit for Human Body
Model
C
S
R
S
SW1
R
C
Device
Under
Test
DC Power
Source
SW2
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com SP202E,232E,233E, 310E, 312E_101_060311
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TYPICAL PERFORMANCE CHARACTERISTICS
Figure 3, SP232E Charge pump waveforms-
no load (1 = C1+, 2 = C2+, 3 = V+, 4 = V-).
Figure 4, SP232E Charge pump waveforms
when fully loaded with 3Kohms (1 = C1+, 2
= C2+, 3 = V+, 4 = V-).
Figure 5, Loopback results at 60KHZ and
2500pF load (1 = TXin, 2 = TXout/RXin, 3 =
RXout).
Figure 6, Charge pump outputs at
start up (1 = Vcc, 2 = V+, 3 = V-).
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com SP202E,232E,233E, 310E, 312E_101_060311
Figure 7, SP202E and SP232E Typical
Application circuit
Figure 9, SP233ECT Typical Application
circuit
Figure 8, SP310E Typical Application
circuit
Figure 10, SP312E Typical Application
circuit
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com SP202E,232E,233E, 310E, 312E_101_060311
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com SP202E,232E,233E, 310E, 312E_101_060311
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com SP202E,232E,233E, 310E, 312E_101_060311
12
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com SP202E,232E,233E, 310E, 312E_101_060311
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com SP202E,232E,233E, 310E, 312E_101_060311
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Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com SP202E,232E,233E, 310E, 312E_101_060311
ORDERING INFORMATION
Part number Temperature range Package Type
SP202ECN-L 00C to +700C 16 pin NSOIC
SP202ECN-L/TR 00C to +700C 16 pin NSOIC
SP202ECP-L 00C to +700C 16 pin PDIP
SP202ECT-L 00C to +700C 16 pin SOICW
SP202ECT-L/TR 00C to +700C 16 pin SOICW
SP202EEN-L -400C to +850C 16 pin NSOIC
SP202EEN-L/TR -400C to +850C 16 pin NSOIC
SP202EEP-L -400C to +850C 16 pin PDIP
SP202EET-L -400C to +850C 16 pin SOICW
SP202EET-L/TR -400C to +850C 16 pin SOICW
SP232ECN-L 00C to +700C 16 pin NSOIC
SP232ECN-L/TR 00C to +700C 16 pin NSOIC
SP232ECP-L 00C to +700C 16 pin PDIP
SP232ECT-L 00C to +700C 16 pin SOICW
SP232ECT-L/TR 00C to +700C 16 pin SOICW
SP232EEN-L -400C to +850C 16 pin NSOIC
SP232EEN-L/TR -400C to +850C 16 pin NSOIC
SP232EEP-L -400C to +850C 16 pin PDIP
SP232EET-L -400C to +850C 16 pin SOICW
SP232EET-L/TR -400C to +850C 16 pin SOICW
SP233ECT-L 00C to +700C 20 pin SOICW
SP233ECT-L/TR 00C to +700C 20 pin SOICW
SP233EET-L -400C to +850C 20 pin SOICW
SP233EET-L/TR -400C to +850C 20 pin SOICW
SP310ECT-L 00C to +700C 18 pin SOICW
SP310ECT-L/TR 00C to +700C 18 pin SOICW
SP310EET-L -400C to +850C 18 pin SOICW
SP310EET-L/TR -400C to +850C 18 pin SOICW
SP312ECT-L 00C to +700C 18 pin SOICW
SP312ECT-L/TR 00C to +700C 18 pin SOICW
SP312EET-L -400C to +850C 18 pin SOICW
SP312EET-L/TR -400C to +850C 18 pin SOICW
All packages are available as lead free (RoHS compliant).
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • www.exar.com SP202E,232E,233E, 310E, 312E_101_060311
16
Notice
EXAR Corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reliabil-
ity. EXAR Corporation assumes no representation that the circuits are free of patent infringement. Charts and schedules contained herein are only for
illustration purposes and may vary depending upon a user's specic application. While the information in this publication has been carefully checked;
no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can
reasonably be expected to cause failure of the life support system or to signicantly affect its safety or effectiveness. Products are not authorized for
use in such applications unless EXAR Corporation receives, in writting, assurances to its satisfaction that: (a) the risk of injury or damage has been
minimized ; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances.
Copyright 2011 EXAR Corporation
Datasheet June 2011
Send your serial transceiver technical inquiry with technical details to: serialtechsupport@exar.com
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
REVISION HISTORY
Date Revision Description
7-19-04 A Original Sipex Data sheet
11-06-08 1.0.0 Generate new Datasheet using Exar format and change
revision to 1.0.0. Remove IEC Air and Contact ESD ratings.
Update ordering information to remove EOL part numbers. Up-
date charge pump description to show regulated charge pump
design.
06-03-11 1.0.1 Remove SP310ECP-L and SP310EEP-L per PDN 110510-01