SP233ACT-L/TR - EXAR - Datasheet.Live

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • Fax (510)668-7017 • www.exar.com SP233A,310A,312A 101_060311

DESCRIPTION

FEATURES

SP233A,SP310A and SP312A

Enhanced RS-232 Line Drivers/Receivers

• Operates from a Single +5V Power Supply

• Meets all RS-232F and ITU V.28 Specications

• Operates with 0.1μF Ceramic Capacitors

• No External Capacitors required (SP233A)

• Low Power Shutdown (SP310A, SP312A)

• High Data Rate - 120kbps under load

• Low power CMOS Operation

• +/-2kV Human Body Model ESD Protection

• Lead Free packaging available

The SP233A / SP310A / SP312A devices are a family of line driver and receiver pairs that meets

the specications of RS-232 and V.28 serial protocols. The devices are pin-to-pin compatible with

popular industry standard pinouts. The SP233A / SP310A / SP312A offer 120kbps data rate under

load, small ceramic type 0.1μF charge pump capacitors and overall ruggedness for comercial appli-

cations. Features include Exar's BiCMOS design allowing for low power operation without sacricing

performance. These devices are available in plastic DIP and SOIC Wide packages operating over

the 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

SP233A 2 2 N/A 0 No No No

SP310A 2 2 0 4 Yes No Yes

SP312A 2 2 2 4 Yes Yes Yes

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • Fax (510)668-7017 • www.exar.com SP233A,310A,312A_101_060311

ABSOLUTE MAXIMUM RATINGS

These are stress ratings only and functional opera-

tion of the device at these ratings or any other above

those indicated in the operation sections of the speci-

cations below are 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............................................................................+/-30V

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

Lead Temperature (soldering, 10s).......... +300°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

SP310A and SP312A only 0.05 +/-10 μA

RS-232 OUTPUT

Output Voltage Swing all Transmitter outputs loaded

with 3k ohms to GND +/-5.0 +/-9V 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 -25 +25 Volts

Voltage Threshold LOW Vcc = 5V, Ta=25°C 0.8 1.2 Volts

Voltage Threshold HIGH Vcc = 5V, Ta=25°C 1.7 2.4 Volts

Hysteresis Vcc = 5V, Ta=25°C 0.2 0.5 1.0 Volts

Resistance Ta=25°C, -25V ≤ Vin ≤ +25V 3 5 7 kΩ

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • Fax (510)668-7017 • www.exar.com SP233A,310A,312A 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 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 SP310A and SP312A 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 10 15 mA

Vcc Power Supply Current, Loaded All Transmitters RL = 3kΩ,

Ta=25°C 25 mA

Shutdown Supply Current

SP310A and SP312A only Vcc = 5V, Ta=25°C 1 10 μA

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

PIN ASSIGNMENTS

20 pin PDIP 20 pin WSOIC

18 pin WSOIC 18 pin WSOIC

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • Fax (510)668-7017 • www.exar.com SP233A,310A,312A_101_060311

DESCRIPTION

DETAILED DESCRIPTION

The SP233A, SP310A and SP312A devices

are a family of line driver and receiver pairs that

meet the EIA/TIA-232 and V.28 serial commu-

nication protocols. These devices are pin-to-pin

compatible with popular industry standards. The

SP233A, SP310A and SP312A devices 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

ESD tolerance has been improved on these de-

vices to +/-2kV Human Body Model.

The SP233A device provides internal charge

pump capacitors. The SP310A provides an ON/

OFF input that simultaneously disables the in-

ternal charge pump circuit and puts all transmit-

ter and receiver outputs into a high impedance

state. The SP312A is identical to the SP310 but

with seperate tri-state and shutdown inputs

Theory Of Operation

The SP233A, SP310A and SP312A devices are

made up of three basic circuit blocks: 1. Drivers,

2. Receivers, and 3. charge pump.

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. Typically, the driver output

voltage swing is +/-9V. 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 drivers can guarantee output data rates of

120kbps under worst case loading of 3k ohms

and 2500pF.

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 levels

to 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 trans-

mission lines. Should an input be left uncon-

nected, an internal 5kohm pull-down resistor to

ground will commit the output of the receiver to

a HIGH state.

Charge pump

The charge pump is a patented design and

uses a unique approach compared to older

less efciant designs. The charge pump re-

quires 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

+/-9V. 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 inverted

(V-) voltage onto C4. Meanwhile, capacitor 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.

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • Fax (510)668-7017 • www.exar.com SP233A,310A,312A 101_060311

DESCRIPTION

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 SP310A and SP312A

Both the SP310A and SP312A 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 SP310A, this control line is

the ON/OFF (pin 18) input. Activating the shut-

down mode puts the SP310A transmitter and re-

ceiver ouptuts into a high impedance condition.

For the SP312A, this control line is the SHUT-

DOWN (pin18) input; this also puts the transmit-

ter outputs in a tri-state mode. The receiver out-

puts can be tri-stated seperately during normal

operation or shutdown by applying a logic "1" on

the EN line (pin 1).

Wake-Up Feature for the SP312A

The SP312A 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 SP312A 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 SP312A 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 SP312A 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.

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 SP233ACT/ACP

The SP233A packaged in a 20 pin SOICW

package (SP233ACT) has a slightly different

pinout than the SP233A in PDIP packaging

(SP233ACP). To operate properly, the fol-

lowing pairs of pins must be externally wired

together as noted in table 2:

Pins Wired

Together

SOICW PDIP

Two V- pins 10 & 17 12 & 17

Two C2+ pins 12 & 15 11 & 15

Two C- pins 11 & 16 10 & 16

No Connections for

Pins 8, 13 and 14

Connect Pins 6 and 9

to GND

Table 2. Pin Strapping table for SP233A

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • Fax (510)668-7017 • www.exar.com SP233A,310A,312A_101_060311

+ +

Phases 1 and 3: Store/Double.

Double charge from C 1 onto C2.

C 2 is now charged to -2xVcc

+ +

Phase 2 – Vss transfer from C2 to C4.

Meanwhile C 1 is charged to Vcc

Vss

transfer from C2 to C3.

Meanwhile C1 is charged to Vcc

V-

V+

V-

V+

Patented 5,306,954

Phase 4 VDD

Figure 1. Charge pump phases

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • Fax (510)668-7017 • www.exar.com SP233A,310A,312A 101_060311

TYPICAL PERFORMANCE CHARACTERISTICS

Figure 2, SP233A Charge pump waveforms-

no load (1 = C1+, 2 = C2+, 3 = V+, 4 = V-).

Figure 3, SP233A Charge pump waveforms

when fully loaded with 3Kohms (1 = C1+, 2

= C2+, 3 = V+, 4 = V-).

Figure 4, Loopback results at 60KHZ and

2500pF load (1 = TXin, 2 = TXout/RXin, 3 =

RXout).

Figure 5, Charge pump outputs at

start up (1 = Vcc, 2 = V+, 3 = V-).

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • Fax (510)668-7017 • www.exar.com SP233A,310A,312A_101_060311

Figure 6, SP233ACP Typical Application

circuit

Figure 8, SP233ACT Typical Application

circuit

Figure 7, SP310A Typical Application

circuit

Figure 9, SP312A Typical Application

circuit

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • Fax (510)668-7017 • www.exar.com SP233A,310A,312A 101_060311

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • Fax (510)668-7017 • www.exar.com SP233A,310A,312A_101_060311

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • Fax (510)668-7017 • www.exar.com SP233A,310A,312A 101_060311

Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • Fax (510)668-7017 • www.exar.com SP233A,310A,312A_101_060311

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.

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.

ORDERING INFORMATION

Part number LEAD FREE Tape & Reel Temperature range Package Type

SP233ACP -L From 0 to +700C 20 pin PDIP

SP233AEP -L From -40 to +850C 20 pin PDIP

SP233ACT -L /TR From 0 to +700C 20 pin SOICW

SP233AET -L /TR From -40 to +850C 20 pin SOICW

SP310ACT -L /TR From 0 to +700C 18 pin SOICW

SP310AET -L /TR From -40 to +850C 18 pin SOICW

SP312ACT -L /TR From 0 to +700C 18 pin SOICW

SP312AET -L /TR From -40 to +850C 18 pin SOICW

All packages are available as lead free (RoHS compliant). To order add “-L” sufx to part number.

For Tape and Reel add “/TR”. Reel quantity is 1,500 for SOICW.

Example: SP233ACT-L/TR = lead free and Tape and Reel. SP233ACT/TR = standard with Tape

and Reel.

REVISION HISTORY

Date Revision Description

1-31-07 Rev B Original SP232A/233A/310A/312A Sipex Data sheet

5-13-08 100 Generate new SP233A/310A/312A Data sheet using Exar

format.

6-03-11 101 Add Revision History table. Remove SP310ACP-L option per

PDN 110510-01.