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ADM223

5 V-Powered CMOS RS-232 Drivers/Receivers

Analog Devices 

a

5 V Powered

CMOS RS-232 Drivers/Receivers

ADM223/ADM230L–ADM241L

FEATURES

Single 5 V Power Supply

Meets All EIA-232-E and V.28 Specifications

120 kB/s Data Rate

On-Board DC-DC Converters

؎9 V Output Swing with 5 V Supply

Small 1 ␮F Capacitors

Low Power Shutdown ≤1 ␮A

Receivers Active in Shutdown (ADM223)

؎30 V Receiver Input Levels

Latch-Up FREE

Plug-In Upgrade for MAX223/230-241

Plug-In Upgrade for AD230–AD241

APPLICATIONS

Computers

Peripherals

Modems

Printers

Instruments

ADM232L TYPICAL OPERATING CIRCUIT

5V INPUT

1␮F

6.3V

C1+ +5V TO +10V VCC

VOLTAGE

C1– DOUBLER

V+

1␮F

6.3V

1␮F

6.3V

1␮F

16V

C2+ +10V TO –10V

VOLTAGE

V–

C2– INVERTER

1␮F

16V

TTL/CMOS

T1IN

T1

INPUTS*

T2IN

T2

T1OUT

T2OUT

RS-232

OUTPUTS

TTL/CMOS

OUTPUTS

R1OUT

R2OUT

R1

R2

GND

ADM232L

R1IN

R2IN

RS-232

INPUTS**

* INTERNAL 400k⍀ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT.

** INTERNAL 5k⍀ PULL-DOWN RESISTOR ON EACH RS-232 INPUT.

GENERAL DESCRIPTION

The ADM2xx family of line drivers/receivers is intended for all

EIA-232-E and V.28 communications interfaces, especially in

applications where ±12 V is not available. The ADM223,

ADM230L, ADM235L, ADM236L and ADM241L feature a

low power shutdown mode that reduces power dissipation to

less than 5 µW, making them ideally suited for battery powered

equipment. Two receivers remain enabled during shutdown on

the ADM223. The ADM233L and ADM235L do not require

any external components and are particularly useful in applica-

tions where printed circuit board space is critical.

All members of the ADM230L family, except the ADM231L

and the ADM239L, include two internal charge pump voltage

converters that allow operation from a single 5 V supply. These

converters convert the 5 V input power to the ± 10 V required

for RS-232 output levels. The ADM231L and ADM239L are

designed to operate from 5 V and 12 V supplies. An internal

+12 V to –12 V charge pump voltage converter generates the

–12 V supply.

The ADM2xxL is an enhanced upgrade for the AD2xx family

featuring lower power consumption, faster slew rate and opera-

tion with smaller (1 µF) capacitors.

Table I. Selection Table

Part

Number

ADM223

ADM230L

ADM231L

ADM232L

ADM233L

ADM234L

ADM235L

ADM236L

ADM237L

ADM238L

ADM239L

ADM241L

Power

Supply Voltage

5V

5V

5 V and 7.5 V to 13.2 V

5V

5V

5V

5V

5V

5V

5V

5 V and 7.5 V to 13.2 V

5V

No. of

RS-232

Drivers

4

5

2

2

2

4

5

4

5

4

3

4

No. of

RS-232

Receivers

5

0

2

2

2

0

5

3

3

4

5

5

External

Capacitors

4

4

2

4

None

4

None

4

4

4

2

4

Low Power

Shutdown

(SD)

Yes (SD)

Yes

No

No

No

No

Yes

Yes

No

No

No

Yes

TTL

Three-State

EN

Yes (EN)

No

No

No

No

No

Yes

Yes

No

No

Yes

Yes

No. of

Pins

28

20

14

16

20

16

24

24

24

24

24

28

REV. B

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, nor for any infringements of patents or other rights of third parties that

may result from its use. No license is granted by implication or otherwise

under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2001

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