ADM232A_15 datasheet(2/11 Pages) AD

Part #	ADM232A

Description	CMOS RS-232 Drivers/Receivers

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Manufacturer	AD [Analog Devices]

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REV.

–2–

ADM222/ADM232A/ADM242–SPECIFICATIONS

(VCC = 5 V

10%. C1–C4 = 0.1

F; all spec-

ifications TMIN to TMAX unless otherwise noted.)

Parameter

Min

Typ

Max

Unit

Test Conditions/Comments

RS-232 TRANSMITTERS

Output Voltage Swing

±5

±9

V

All Transmitter Outputs Loaded with

3 k

Ω to Ground

Input Logic Threshold Low, VINL

1.7

0.8

V

TIN

Input Logic Threshold High, VINH

2.4

1.7

V

TIN

Logic Pull-Up Current

12

40

µATIN = 0 V

Data Rate

200

kB/s

Output Resistance

300

Ω

VCC = V+ = V– = 0 V, VOUT =

±2 V

Output Short Circuit Current (Instantaneous)

±10

mA

RS-232 RECEIVERS

RS-232 Input Voltage Range

–30

+30

V

RS-232 Input Threshold Low

0.8

1.2

V

RS-232 Input Threshold High

1.6

2.4

V

RS-232 Input Hysteresis

0.2

0.4

1.0

V

VCC = 5 V

RS-232 Input Resistance

3

5

7

k

Ω

TA = 0

°C to 85°C

TTL/CMOS Output Voltage Low, VOL

0.05

0.4

V

IOUT = 3.2 mA

TTL/CMOS Output Voltage High, VOH

3.5

V

IOUT = –1.0 mA

TTL/CMOS Output Short-Circuit Current

–2

–85

mA

Source Current (VOUT = GND)*

TTL/CMOS Output Short-Circuit Current

10

35

mA

Sink Current (VOUT = VCC)*

TTL/CMOS Output Leakage Current

±0.05 ±10

µA

SHDN = GND/EN = V

CC

0 V

≤ VOUT ≤ VCC

EN Input Threshold Low, V

INL

1.4

0.8

V

EN Input Threshold High, V

INH

2.0

1.4

V

POWER SUPPLY

Power Supply Current

4

8

mA

No Load

13

mA

3 k

Ω Load on Both Outputs

Shutdown Power Supply Current

0.1

10

µA

SHDN Input Leakage Current

±1

µA

SHDN Input Threshold Low, V

INL

1.4

0.8

V

SHDN Input Threshold High, V

INH

2.0

1.4

V

AC CHARACTERISTICS

Transition Region Slew Rate

3

8

30

V/

µsCL = 50 pF to 1000 pF, RL = 3 kΩ to 7 kΩ

Measured from +3 V to –3 V or –3 V to +3 V

Transmitter Propagation Delay TTL to RS-232

0.85

3.5

µst

PHLT

1.0

3.5

µstPLHT

Receiver Propagation Delay RS-232 to TTL

0.1

0.5

µstPHLR

0.3

0.5

µst

PLHR

Receiver Output Enable Time

125

500

ns

tER

Receiver Output Disable Time

160

500

ns

tDR

Transmitter Output Enable Time

250

µs

SHDN Goes High

Transmitter Output Disable Time

3.5

µs

SHDN Goes Low

Transmitter + to – Propagation Delay Difference

150

ns

Receiver + to – Propagation Delay Difference

200

ns

*Guaranteed by design, not production tested.

Specifications subject to change without notice.

B

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