SN75C189, SN75C189A

QUADRUPLE LOW-POWER LINE RECEIVERS

SLLS041G – OCTOBER 1988 – REVISED JANUARY 2000

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POST OFFICE BOX 655303

TIA/EIA-232-F and ITU Recommendation

V.28

Pin-to-Pin Compatible With

Texas Instruments SN75189/SN75189A and

Motorola MC1489/MC1489A

Small-Outline (D) and Shrink Small-Outline

(DB) Packages, and Standard Plastic (N)

DIP

description

The SN75C189 and SN75C189A are low-power, bipolar, quadruple line receivers that are used to interface data

terminal equipment (DTE) with data circuit-terminating equipment (DCE). These devices have been designed

to conform to TIA/EIA-232-F.

The SN75C189 has a 0.33-V typical hysteresis, compared with 0.97 V for the SN75C189A. Each receiver has

provision for adjustment of the overall input threshold levels. This is achieved by choosing external series

resistors and voltages to provide bias levels for the response-control pins. The output is in the high logic state

if the input is open circuit or shorted to ground.

These devices have an on-chip filter that rejects input pulses of less than 1-

µs duration. An external capacitor

can be connected from the control pins to ground to provide further input noise filtering for each receiver.

The SN75C189 and SN75C189A have been designed using low-power techniques in a bipolar technology. In

most applications, these receivers interface to single inputs of peripheral devices such as UARTs, ACEs, or

microprocessors. By using sampling, such peripheral devices usually are insensitive to the transition times of

the input signals. If this is not the case, or for other uses, it is recommended that the SN75C189 and SN75C189A

outputs be buffered by single Schmitt input gates or single gates of the HCMOS, ALS, or 74F logic families.

The SN75C189 and SN75C189A are characterized for operation from 0

°C to 70°C.

Copyright

© 2000, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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1A

1 CONT

1Y

2A

2 CONT

2Y

GND

4A

4 CONT

4Y

3A

3 CONT

3Y

D, DB, OR N PACKAGE

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