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-us 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.

• Meet or Exceed the Requirements of TIA/EIA-232-F and ITU Recommendation V.28
• Low Supply Current...420 uA Typ
• Preset On-Chip Input Noise Filter
• Built-in Input Hysteresis
• Response and Threshold Control Inputs
• Push-Pull Outputs
• Functionally Interchangeable and Pin-to-Pin Compatible With Texas Instruments SN75189/SN75189A and Motorola MC1489/MC1489A
• Package Options Include Plastic Small-Outline (D) and Shrink Small-Outline (DB) Packages, and Standard Plastic (N) DIP

• Drivers per package
• 0
• Receivers per package
• 4
• Logic voltage (Min) (V)
• 5
• Data rate (Max) (kbps)
• 1000
• Main supply voltage (Nom) (V)
• 5
• ESD HBM (kV)
• 0
• Rating
• Catalog
• Operating temperature range (C)
• 0 to 70

SN75C189A的完整型号有：SN75C189AD、SN75C189ADBR、SN75C189ADR、SN75C189AN、SN75C189ANSR，以下是这些产品的关键参数及官网采购报价：

SN75C189AD，工作温度：0 to 70，封装：SOIC (D)-14，包装数量MPQ：50个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网SN75C189AD的批量USD价格：.274（1000+）

SN75C189ADBR，工作温度：0 to 70，封装：SSOP (DB)-14，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网SN75C189ADBR的批量USD价格：.253（1000+）

SN75C189ADR，工作温度：0 to 70，封装：SOIC (D)-14，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网SN75C189ADR的批量USD价格：.228（1000+）

SN75C189AN，工作温度：0 to 70，封装：PDIP (N)-14，包装数量MPQ：25个，MSL 等级/回流焊峰值温度：N/A for Pkg Type，引脚镀层/焊球材料：NIPDAU，TI官网SN75C189AN的批量USD价格：.262（1000+）

SN75C189ANSR，工作温度：0 to 70，封装：SO (NS)-14，包装数量MPQ：2000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：NIPDAU，TI官网SN75C189ANSR的批量USD价格：.251（1000+）

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