Datasheet SP231A, SP232A, SP233A, SP310A, SP312A Datasheet (Sipex)

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Page 1

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SP231A/232A/233A/310A/312A

Enhanced RS-232 Line Drivers/Receivers

■ Operates from Single 5V Power Supply

■ Meets All RS-232D and V.28

Specifications

■ Multiple Drivers and Receivers

■ Small Charge Pump Capacitors –

0.1µF

■ Operates with 0.1µF and 100µF Capacitors

■ High Data Rate – 120kbps Under Load

■ High Output Slew Rate –

10V/µs Under Load

■ Low Power Shutdown ≤1µA

■ 3-State TTL/CMOS Receiver Outputs

■ ±30V Receiver Input Levels

■ Low Power CMOS – 15mA Operation

DESCRIPTION…

The Sipex SP231A, SP232A and SP233A are enhanced versions of the Sipex SP231, SP232 and SP233 RS-232 line drivers/receivers. They are pin-for-pin replacements for these earlier versions and will operate in their sockets. Performance enhancements include 10V/µs slew rate, 120k bits per second guaranteed transmission rate, and increased drive current for longer and more flexible cable configurations. Ease of use enhancements include smaller, 0.1µF charge pump capacitors, enhanced ESD protection, low power dissipation and overall ruggedized construction for commercial environments. The series is available in plastic and ceramic DIP and SOIC packages operating over the commercial, industrial and military temperature ranges.

RS-232 OUTPUTS

CHARGE

PUMP

TTL/CMOS INPUTS

RS-232 INPUTS

TTL/CMOS OUTPUTS

Page 2

ABSOLUTE MAXIMUM RATINGS

This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability.

.................................................................................................................................................................

cc +

....................................................................................................................

..............................................................................................................................................................

Input Voltages

.........................................................................................................................

............................................................................................................................................................

(Vcc-0.3V) to +13.2V

-0.3 to (Vcc +0.3V)

+6V

13.2V

±30V

Output Voltages

....................................................................................................

OUT

................................................................................................................

OUT

Short Circuit Duration

.........................................................................................................................................

OUT

Power Dissipation

CERDIP .............................................................................. 675mW

(derate 9.5mW/°C above +70°C)

Plastic DIP .......................................................................... 375mW

(derate 7mW/°C above +70°C)

Small Outline ...................................................................... 375mW

(derate 7mW/°C above +70°C)

(V+, +0.3V) to (V-, -0.3V)

-0.3V to (Vcc +0.3V) Continuous

SPECIFICATIONS

VCC=+5V±10%; V+=+8.5V to +13.2V (SP231A only) 0.1µF charge pump capacitors; T

PARAMETERS MIN. TYP. MAX. UNITS CONDITIONS TTL INPUT

Logic Threshold

LOW 0.8 Volts TIN ; EN, SD

HIGH 2.0 Volts TIN ; EN, SD Logic Pullup Current 15 200 µATIN = 0V Maximum Data Rate 120 kbps CL = 2500pF, RL= 3kΩ

TTL OUTPUT

TTL/CMOS Output

Voltage, Low 0.4 Volts I

Voltage, High 3.5 Volts I Leakage Current **; TA = +25° 0.05 ±10 µA EN = VCC, 0V≤V

RS-232 OUTPUT

Output Voltage Swing ±5 ±9 Volts All transmitter outputs loaded Output Resistance 300 Ohms VCC = 0V; V

Output Short Circuit Current ±18 mA Infinite duration

RS-232 INPUT

Voltage Range -30 +30 Volts Voltage Threshold

LOW 0.8 1.2 Volts VCC = 5V, TA = +25°C

HIGH 1.7 2.4 Volts VCC = 5V, TA = +25°C Hysteresis 0.2 0.5 1.0 Volts VCC = 5V, TA = +25°C Resistance 3 5 7 kΩ

to T

unless otherwise noted.

MIN

MAX

= 3.2mA; Vcc = +5V

OUT

= -1.0mA

OUT

with 3kΩ to Ground

= ±2V

OUT

TA = +25°C, -15V ≤ V

≤V

≤ +15V

DYNAMIC CHARACTERISTICS

Propagation Delay, RS232 to TTL 1.5 µs Instantaneous Slew Rate 30 V/µsCL = 10pF, RL= 3-7kΩ;

TA =+25°C

Transition Region Slew Rate 10 V/µsCL = 2500pF, RL= 3kΩ;

measured from +3V to -3V

or -3V to +3V Output Enable Time ** 400 ns SP310A and SP312A only Output Disable Time ** 250 ns SP310A and SP312A only

POWER REQUIREMENTS

VCC Power Supply Current 10 15 mA No load, TA= +25°C; VCC = 5V

25 mA All transmitters RL = 3kΩ;

TA = +25°C V+ Power Supply Current *** 9 15 mA No load, V+ = 12V,TA=+25°C Shutdown Supply Current ** 1 10 µAVCC = 5V, TA = +25°C

**SP310A and SP312A only; *** SP231A only

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PERFORMANCE CURVES

-11

-10

-9

-8

-7

-6

V– Voltage (Volts)

-5

-4

-3 02468101214

Load Current (mA)

PINOUT…

C+

C-

V-

T2 OUT

R2 IN

R2 OUT

T2 IN

14-Pin Plastic DIP

C +

V+

C -

C +

C -

V-

T OUT

R IN

= 6V

= 5V

= 4V

SP231A

SP232A

14 13 12 11 10

9 8

16 15 14 13 12 11 10

V+ (Volts)

0 5 10 15 20

V+ V

GND T1 OUT R1 IN R1 OUT T1 IN

GND T OUT

R IN

R OUT

T IN

R OUT

= 5V

= 4V

Load Current (mA)

T IN

R OUT

R IN

T OUT

GND V

C +

GND C -

= 6V

25 30 35 40

1 2 3 4 5 6 7 8 9

20-PIN PLASTIC DIP

(mA)

-55 -40 0 25 70 85 125 Temperature (°C)

R OUT

R IN

SP233ACP

T OUT

V-

C -

C +

V+

C -

V-

C +

8.4

8.2

= 6V

= 5V

= 4V

= 3V

C+

CV-

T2 OUT

R2 IN

R2 OUT

T2 IN

2 2

T IN

R OUT

R IN

T OUT

GND

V+ GND V–

8.0

7.8

7.6

(Volts)

7.4

7.2

7.0

6.8

4.5 4.75 5.0 5.25 5.5

1 2

SP231A

3 4 5 6 7 8

16-Pin SOIC

1 2 3

SP233ACT

4 5 6 7 8 9

Load current = 0mA T

= 25°C

(Volts)

16 15 14 13 12 11 10

20 19 18 17 16 15 14 13 12 11

V+ V

GND T1 OUT R1 IN R1 OUT T1 IN NC

R OUT

R IN

T OUT

VC -

C +

C –

C +

C –

20-PIN SOIC

NC C +

V+ C -

C +

C -

VT OUT

R IN

1 2 3

SP310A

4 5 6 7 8 9

ON/OFF

GND

T OUT

R IN

R OUT

T IN

R OUT

EN C +

V+ C -

C +

C -

VT OUT

R IN

2 3

SP312A

4 5 6 7 8 9

17 16 15 14 13 12 11 10

SHUTDOWN V

GND T OUT

R IN

R OUT

T IN

R OUT

Page 4

FEATURES…

0.1 to 100µF, either polarized or non–polarized, and feature several improvements in both performance and ease of use. Performance enhancements include 10V/µs slew rate, 120k bits per second guaranteed transmission rate, and increased drive current for longer and more flexible cable configurations. Ease of use enhancements include smaller, 0.1µF charge pump capacitors, enhanced ESD protection, low power dissipation and overall ruggedized construction for commercial environments.

The SP232A, SP233A, SP310A and SP312A include charge pump voltage converters which allow them to operate from a single +5V supply. These converters convert the +5V input power to the ±10V needed to generate the RS-232 output levels. Both meet all EIA RS-232D and CCITT V.28 specifications. The SP231A has provisions for external V+ supplies. With this power supplied externally, the current drain due to charge pump operation is considerably reduced, typically to 400µA.

The SP310A provides identical features as the SP232A. The SP310A has a single control line which simultaneously shuts down the internal DC/ DC converter and puts all transmitter and receiver outputs into a high impedance state. The SP312A is identical to the SP310A with separate tri-state and shutdown control lines.

The SP231A is available in 14-pin plastic DIP, CERDIP and 16-pin SOIC packages for operation over commercial, industrial and military temperature ranges. The SP232A is available in 16-pin plastic DIP, SOIC and CERDIP

packages, operating over the commercial, industrial and military temperature ranges. The SP233A is available in a 20-pin plastic DIP and 20–pin SOIC package for operation over the commercial and industrial temperature ranges. The SP310A and SP312A are available in 18-pin plastic, CERDIP and SOIC packages for operation over the commercial and industrial temperature ranges. Please consult the factory for DIP and surface-mount packaged parts supplied on tape-on-reel, as well as parts screened to MIL-M-38510.

THEORY OF OPERATION

The SP231A, SP232A, SP233A, SP310A and SP312A devices are made up of three basic circuit

blocks – 1) a driver/transmitter, 2) a receiver and 3) a charge pump. Each block is described below.

Driver/Transmitter

The drivers are inverting transmitters, which accept TTL or CMOS inputs and output the RS-232 signals with an inverted sense relative to the input logic levels. Typically the RS-232 output voltage swing is ±9V. Even under worst case loading conditions of 3kOhms and 2500pF, the output is guaranteed to be ±5V, which is consistent with the RS-232 standard specifications. The transmitter outputs are protected against infinite short-circuits to ground without degradation in reliability.

The instantaneous slew rate of the transmitter output is internally limited to a maximum of 30V/ µs in order to meet the standards [EIA RS-232-D

2.1.7, Paragraph (5)]. However, the transition region slew rate of these enhanced products is typically 10V/µs. The smooth transition of the loaded output from VOL to VOH clearly meets the monotonicity requirements of the standard [EIA RS-232-D 2.1.7, Paragraphs (1) & (2)].

GND

INTERNAL

OSCILLATOR

Figure 1. Charge Pump Voltage Doubler Figure 2. Charge Pump Voltage Inverter

C1 C3

V+ = 2V

V+

FROM

VOLTAGE DOUBLER

GND

INTERNAL

OSCILLATOR

C2 C4

GND

V- = -(V+)

Page 5

Receivers

The receivers convert RS-232 input signals to inverted TTL signals. Since the input is usually from a transmission line, where long cable lengths 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.

As shown in Figure 1, an internal oscillator triggers the charge accumulation and voltage inversion. The voltage doubler momentarily stores a charge on capacitor C1 equal to Vcc, referenced to ground. During the next transition of the oscillator this charge is boot-strapped to transfer charge to capacitor C3. The voltage across C3 is now from Vcc to V+.

The input thresholds are 0.8V minimum and

2.4V maximum, again well within the ±3V RS-232 requirements. The receiver inputs are also protected against voltages up to ±30V. Should an input be left unconnected, a 5kOhm pulldown 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 the receiver inputs before power is applied to the receiver circuitry. This occurs, for example, when a PC user attempts to print, only to realize 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 enhanced devices are fully protected.

Charge Pump

The charge pump section of the these devices allows the circuit to operate from a single +5V ±10% power supply by generating the required operating voltages internal to the devices. The charge pump consists of two sections — 1) a voltage doubler and 2) a voltage inverter.

In the inverter section (Figure 2), the voltage across C3 is transferred to C2 forcing a range of 0V to V+ across C2. Boot-strapping of C2 will then transfer charge to C4 to genrate V-.

One of the significant enhancements over previous products of this type is that the values of the capacitors are no longer critical and have been decreased in size considerably to 0.1µF. Because the charge pump runs at a much higher frequency, the 0.1µF capacitors are sufficient to transfer and sustain charges to the two transmitters.

APPLICATION HINTS Protection From Shorts to ±15V

The driver outputs are protected against shorts to ground, other driver outputs, and V+ or V-. If the possibility exists that the outputs could be inadvertently connected to voltages higher than ±15V, then it is recommended that external protection be provided. For protection against voltages exceeding ±15V, two back-to-back zener diodes connected from each output to ground will clamp the outputs to an acceptable voltage level.

+5V INPUT

10 F 6.3V

+5V INPUT

V+ (+8.5V to +13.2V)

C +

C -

SP231A

+12V to -12V

Voltage Inverter

400k

Ω

400k Ω

V+

V-

Ω

12GND

0.1 F

6.3V

T IN

TTL/CMOS INPUTS

910

TTL/CMOS OUTPUTS

0.1 F

0.1 F 16V

T OUT

RS-232 OUTPUTS

R INR OUT

RS-232 INPUTS

6.3V

0.1 F 16V

T IN

TTL/CMOS INPUTS

TTL/CMOS OUTPUTS

*The negative terminal of the V+ storage capacitor can be tied to either V is recommended.

C +

C -

C +

C -

SP232A

+5V to +10V

Voltage Doubler

+10V to -10V

Voltage Inverter

400k

Ω

400k Ω

15GND

0.1 F 6.3V

V+

V-

Ω

0.1 F

16V

T OUT

R INR OUT

3 4

12 13

or GND. Connecting the capacitor to VCC (+5V)

RS-232 OUTPUTS

RS-232 INPUTS

Figure 3. Typical Circuits using the SP231A and 232A.

Page 6

+5V INPUT

400k Ω

T IN

400k Ω

T IN

TTL/CMOS INPUTS

TTL/CMOS OUTPUTS

Do not make

connection to

these pins

Internal

-10V Power Supply

Internal

+10V Power

Supply

20 19

C +

C -

V-

SP233A

V+

GND

Ω

GND

T OUT

RS-232 OUTPUTS

R INR OUT

RS-232 INPUTS

C +

C -

Figure 4. Typical Circuits using the SP233ACP and SP233ACT

Shutdown (SD) and Enable (EN) SP310A/SP312A Only

Both the SP310A and SP312A have a shut-down/ standby mode to conserve power in battery-powered systems. 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 ON/OFF (pin

18). Activating the shutdown mode also puts the SP310A transmitter and receiver outputs in a high impedance condition (tri-stated). The shutdown mode is controlled on the SP312A by a logic “0” on the SHUTDOWN control line (pin 18); this also puts the transmitter outputs in a tri–state mode. The receiver outputs can be tri–stated separately during normal operation or shutdown by a logic “1” on the ENABLE line (pin 1).

Wake–Up Feature (SP312A Only)

The SP312A has a wake–up feature that keeps all the receivers in an enabled state when the device is in the shutdown mode. Table 1 defines the truth table for the wake–up function.

400k Ω

T IN

400k Ω

T IN

TTL/CMOS INPUTS

TTL/CMOS OUTPUTS

Do not make

connection to

these pins

Internal

-10V Power Supply

Internal

+10V Power

Supply

20 19

C +

C -

V-

SP233ACT

V+

GND

Ω

GND

T OUT

RS-232 OUTPUTS

R INR OUT

RS-232 INPUTS

C +

C -

After the ring indicator signal has propagated through the SP312A 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 SP312A to a logic high, taking it out of the shutdown mode. The receiver propagation delay is typically 1µs. The enable time for V+ and V– is typically 2ms. After V+ and V– have settled to their final 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 and transmit data.

Pin Strapping — SP233ACT Only

The SP233A packaged in the 20–pin SOIC package (SP233ACT) has a slightly different pinout than the SP233A in other package configurations. To operate properly, the following pairs of pins must be externally wired together:

the two V– pins (pins 10 and 17) the two C2+ pins (pins 12 and 15) the two C2– pins (pins 11 and 16)

With only the receivers activated, the SP312A typically draws less than 5µA supply current (10µA maximum). In the case of a modem

All other connections, features, functions and performance are identical to the SP233A as specified elsewhere in this data sheet.

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.

SD EN

0 0 1 1

Table 1. Wake-up Function Truth Table.

0 1 0 1

Power

Up/Down

Down Down

Up Up

Receiver

Outputs

Enable

Tri–state

Enable

Tri–state

Page 7

+5V INPUT

10 F 6.3V

C +

C -

C +

C -

+5V to +10V

Voltage Doubler

+10V to -10V

Voltage Inverter

400k

Ω

400k Ω

SP310A

16GND

0.1 F

6.3V

4 5

0.1 F

16V

T IN

TTL/CMOS INPUTS

13 14

10 9

TTL/CMOS OUTPUTS

*The negative terminal of the V+ storage capacitor can be tied

or GND. Connecting the capacitor to VCC (+5V)

to either V

is recommended.

0.1 µF 16V

V+

V-

Ω

0.1 µF 16V

T OUT

RS-232 OUTPUTS

R INR OUT

RS-232 INPUTS

ON/OFF

Figure 5. Typical Circuits using the SP310A and SP312A

+5V INPUT

10 F 6.3V

C +

C -

C +

C -

+5V to +10V

Voltage Doubler

+10V to -10V

Voltage Inverter

400k

Ω

400k Ω

SP312A

16GND

0.1 F

6.3V

4 5

0.1 F

16V

T IN

TTL/CMOS INPUTS

TTL/CMOS OUTPUTS

*The negative terminal of the V+ storage capacitor can be tied to either V

or GND. Connecting the capacitor to VCC (+5V)

is recommended.

0.1 F

V+

V-

Ω

16V

0.1 F

16V

T OUT

R INR OUT

SHUTDOWN

RS-232 OUTPUTS

RS-232 INPUTS

Page 8

Model .......................................................................................Temperature Range................................................................................ Package

ORDERING INFORMATION

SP231ACP ..................................................................................... 0°C to +70°C ....................................................................... 14–pin Plastic DIP

SP231ACT ..................................................................................... 0°C to +70°C ................................................................................ 16–pin SOIC

SP231ACX ..................................................................................... 0°C to +70°C .............................................................................................. Dice

SP231AEP ................................................................................... –40°C to +85°C ..................................................................... 14–pin Plastic DIP

SP231AET ................................................................................... –40°C to +85°C .............................................................................. 16–pin SOIC

SP232ACN..................................................................................... 0°C to +70°C ........................................................................... 16–pin N–SOIC

SP232ACP ..................................................................................... 0°C to +70°C ....................................................................... 16–pin Plastic DIP

SP232ACT ..................................................................................... 0°C to +70°C ................................................................................ 16–pin SOIC

SP232ACX ..................................................................................... 0°C to +70°C .............................................................................................. Dice

SP232AEN ................................................................................... –40°C to +85°C .......................................................................... 16–pin N-SOIC

SP232AEP ................................................................................... –40°C to +85°C ..................................................................... 16–pin Plastic DIP

SP232AET ................................................................................... –40°C to +85°C .............................................................................. 16–pin SOIC

SP233ACP ..................................................................................... 0°C to +70°C ....................................................................... 20–pin Plastic DIP

SP233ACT ..................................................................................... 0°C to +70°C ................................................................................ 20–pin SOIC

SP233AEP ................................................................................... –40°C to +85°C ..................................................................... 20–pin Plastic DIP

SP233AET ................................................................................... –40°C to +85°C .............................................................................. 20–pin SOIC

SP310ACP ..................................................................................... 0°C to +70°C ....................................................................... 18–pin Plastic DIP

SP310ACT ..................................................................................... 0°C to +70°C ................................................................................ 18–pin SOIC

SP310ACX ..................................................................................... 0°C to +70°C .............................................................................................. Dice

SP310AEP ................................................................................... –40°C to +85°C ..................................................................... 18–pin Plastic DIP

SP310AET ................................................................................... –40°C to +85°C .............................................................................. 18–pin SOIC

SP312ACP ..................................................................................... 0°C to +70°C ....................................................................... 18–pin Plastic DIP

SP312ACT ..................................................................................... 0°C to +70°C ................................................................................ 18–pin SOIC

SP312ACX ..................................................................................... 0°C to +70°C .............................................................................................. Dice

SP312AEP ................................................................................... –40°C to +85°C ..................................................................... 18–pin Plastic DIP

SP312AET ................................................................................... –40°C to +85°C .............................................................................. 18–pin SOIC

Please consult the factory for pricing and availability on a Tape-On-Reel option.

Corporation

SIGNAL PROCESSING EXCELLENCE

Sipex Corporation Headquarters and

Sales Office

22 Linnell Circle Billerica, MA 01821 TEL: (978) 667-8700 FAX: (978) 670-9001 e-mail: sales@sipex.com

Sales Office

233 South Hillview Drive Milpitas, CA 95035 TEL: (408) 934-7500 FAX: (408) 935-7600

Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of the application or use of any product or circuit described hereing; neither does it convey any license under its patent rights nor the rights of others.

Datasheet SP231A, SP232A, SP233A, SP310A, SP312A Datasheet (Sipex)

Specifications and Main Features

Frequently Asked Questions

User Manual