TI SN65C189D

The SN65C189,SN65C189A,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 with ANSl Standard EIA/TIA-232-E.

The SN65C189 and SN75C189 have a 0.33 V typical hysteresis compared with 0.97 V for the SN65C189A and 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 left open circuited or shorted to ground.

The SN65C189, SN75C189, SN65C189A, and SN75C189A have been designed using low-power techniques in a bipolar technology. In most applications, these receivers will interface to single inputs of peripheral devices such as UARTs, ACEs, or microprocessors. By using sampling, such peripheral devices are usually insensitive to the transition times of the input signals. If this is not the case or for other uses, it is recommended that the SN65C189, SN75C189, SN65C189A, and SN75C189A outputs be buffered by single Schmitt input gates or single gates of the HCMOS, ALS, or 74F logic families.

The SN65C189 and SN65C189A are characterized for operation from -40°C to 85°C. The SN75C189 and SN75C189A are characterized for operation from 0°C to 70°C.

• Low Supply Current ... 420 μA Typ
• Preset On-Chip Input Noise Filter
• Built-in Input Hysteresis
• Response and Threshold Control Inputs
• Push-Pull Outputs
• Functionally Interchangeable and Pin Compatible With Texas Instruments SN75189/SN75189A, Motorola MC1489/MC1489A, and National Semiconductor DS14C88A