Datasheet SP202E, SP310EET-L, SP232E, SP233E, SP310E Specification

SP202E,SP232E, SP233E, SP310E and SP312E

High Performance RS-232 Line Drivers/Receivers

FEATURES

• 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

DESCRIPTION

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

Drivers Receivers

active in
Shutdown

No. of External

0.1μF Capacitors

Shutdown WakeUp TTL Tri-State

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

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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 re­liability.

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)

ABSOLUTE MAXIMUM RATINGS

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

Vcc = 5V ±10%, 0.1μF charge pump capacitors, Tmin to Tmax, unless otherwise noted, Typical values are Vcc =

ELECTRICAL CHARACTERISTICS

5V and Ta=25°C

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

RS-232 OUTPUT

Output Voltage Swing

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

Voltage Threshold HIGH

Hysteresis

Resistance

** SP310E and SP312E only

En = Vcc, 0V ≤ VOuT ≤ Vcc 0.05 +/-10 μA

all Transmitter outputs loaded

with 3k ohms to GND

Vcc = 5V, Ta=25°C

Vcc = 5V, Ta=25°C

Vcc = 5V, Ta=25°C

Ta = 25°C, -15V ≤ Vin ≤ +15V

+/-5.0 +/-6 Volts

0.8 1.2 Volts

1.7 2.8 Volts

0.2 0.5 1.0 Volts

3 5 7 kΩ

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Vcc = 5V ±10%, 0.1μF charge pump capacitors, Tmin to Tmax, unless otherwise noted, Typical values are Vcc =

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

VCC = 6V

VCC = 5V

VCC = 4V

VCC = 3V

I

CC

(mA)

0 5 10 15 20

Load Current (mA)

0

6

8

10

12

V+ (Volts)

2

4

VCC = 5V

VCC = 4V

VCC = 6V

25 30 35 40

4.5 4.75 5.0 5.25 5.5

VCC (Volts)

5.0

6.5

7.0

7.5

8.0

8.5

9.0

Load current = 0mA
TA = 25C

V

OH

(Volts)

5.5

6.0

ELECTRICAL CHARACTERISTICS

5V and Ta=25°C

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

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

CL = 2500pF, RL = 3kΩ;
Measured from +3V to -3V or

-3V to +3V

All Transmitters RL = 3kΩ,
Ta= 25°C

10 V/μs

15 mA

Shutdown Supply Current **

** SP310E and SP312E only

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Vcc = 5V, Ta= 25°C 1 5 μA

PERFORMANCE CURVES

3

PIN ASSIGNMENTS

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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 on­board charge pump that operates from a single
5V supply using 0.1μF ceramic capacitors.

The SP202E, 232E, 233E, 310E and 312E de­vices have internal charge pump voltage con­verters which allow them to operate from a sin­gle +5V supply. The charge pumps will operate
with polarized or non-polarized capacitors rang­ing 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/TIA­232 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 stan­dards (EIA-232F). Additionally, the driver out­puts LOW to HIGH transition meets the mon­tonic output requirements of the standard.

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Receivers

DESCRIPTION

The receivers convert EIA/TIA-232 signal lev­els to inverted TTL or CMOS logic output lev­els. Since the input is usually from a transmis­sion 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 pos­sible for signals to be applied to receiver inputs
before power is applied to the receiver circuitry.
This occurs, for example, when a PC user at­tempts 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 ter­minals 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 con­nected 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 invert­ed (V-) voltage onto C4. Meanwhile, capacitor

5

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 posi­tive 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 op­erates 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 resis­tance). Inexpensive surface mount, ceramic ca­pacitors 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.

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 transmis­sion.
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 microproces­sor, 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 typi­cally 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 ENPower

Up/Down

Receiver
outputs

0 0 Down Enabled

0 1 Down Tri-state

1 0 Up Enabled

1 1 Up Tri-state

DESCRIPTION

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 battery­powered 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 shut­down mode puts the SP310E transmitter and
receiver ouptuts into a high impedance con­dition. For the SP312E, this control line is the
SHUTDOWN (pin18) input; this also puts the
transmitter outputs in a tri-state mode. The re­ceiver outputs can be tri-stated seperately dur­ing normal operation or shutdown by applying a
logic "1" on the EN line (pin 1).

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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

Two V- pins 10 & 17

Two C2+ pins 12 & 15

Two C- pins 11 & 16

SOICW

Connect Pins 6 and 9 to
GND

Table 2. Pin Strapping table for SP233E

6

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 V

DD

C

S

R

S

SW1

R

C

Device
Under
Test

DC Power

Source

SW2

DESCRIPTION

Figure 1. Charge pump phases

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 envi­ronments 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 gener­ally accepted ESD testing method for semi-

conductors. This method is also specied in

MIL-STD-883, Method 3015.7 for ESD testing.

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The premise of this ESD test is to simulate
the human body's potential to store electro­static 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

7

TYPICAL PERFORMANCE CHARACTERISTICS

Figure 3, SP232E Charge pump waveforms­no 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 6, Charge pump outputs at
start up (1 = Vcc, 2 = V+, 3 = V-).

Figure 5, Loopback results at 60KHZ and
2500pF load (1 = TXin, 2 = TXout/RXin, 3 =
RXout).

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Figure 7, SP202E and SP232E Typical
Application circuit

Figure 9, SP233ECT Typical Application
circuit

Figure 8, SP310E Typical Application
circuit

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Figure 10, SP312E Typical Application
circuit

9

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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).

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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. Up­date 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

Notice

EXAR Corporation reserves the right to make changes to any products contained in this publication in order to improve design, performance or reliabil­ity. 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: [e-mail]

Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.

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