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ADM223
(Rev.:1997)

+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)

ESD > 2 kV

؎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

1µF

6.3V

1µF

16V

1 C1+

+5V TO +10V

VOLTAGE

VCC 16

3 C1– DOUBLER

V+ 2

4 C2+ +10V TO –10V

VOLTAGE

5 C2– INVERTER

V– 6

1µF

6.3V

1µF

16V

1µF

6.3V

TTL/CMOS T1IN

11

INPUTS*

T2IN 10

TTL/CMOS R1OUT 12

OUTPUTS

R2OUT 9

T1

14

T2

7

R1

13

R2

8

GND ADM232L

15

T1OUT RS-232

OUTPUTS

T2OUT

R1IN

R2IN

RS-232

INPUTS**

*INTERNAL 400kΩ PULL-UP RESISTOR ON EACH TTL/CMOS INPUT

**INTERNAL 5kΩ 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 sup-

plies. An internal +12 V to –12 V charge pump voltage con-

verter 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

Power

Supply Voltage

No. of

RS-232

Drivers

No. of

RS-232 External

Receivers Capacitors

Low Power

Shutdown

(SD)

TTL

Three-State No. of

EN

Pins

ADM223 +5 V

4

5

ADM230L +5 V

5

0

ADM231L +5 V & +7.5 V to +13.2 V 2

2

ADM232L +5 V

2

2

ADM233L +5 V

2

2

ADM234L +5 V

4

0

ADM235L +5 V

5

5

ADM236L +5 V

4

3

ADM237L +5 V

5

3

ADM238L +5 V

4

4

ADM239L +5 V & +7.5 V to +13.2 V 3

5

ADM241L +5 V

4

5

REV. 0

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

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

otherwise under any patent or patent rights of Analog Devices.

4

4

2

4

None

4

None

4

4

4

2

4

Yes (SD)

Yes

No

No

No

No

Yes

Yes

No

No

No

Yes

Yes (EN)

28

No

20

No

14

No

16

No

20

No

16

Yes

24

Yes

24

No

24

No

24

Yes

24

Yes

28

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

Tel: 617/329-4700

World Wide Web Site: http://www.analog.com

Fax: 617/326-8703

© Analog Devices, Inc., 1997

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