Differential Bus Transceiver

The SN75176A differential bus

transceiver is a monolithic integrated circuit designed for bidirectional data

communication on multipoint bus-transmission lines. It is designed for balanced

transmission lines and meets ANSI Standard EIA/TIA-422-B and ITU Recommendation

V.11.

The

SN75176A combines a 3-state differential line driver and a differential input line

receiver, both of which operate from a single 5-V power supply. The driver and

receiver have active-high and active-low enables, respectively, that can be

externally connected together to function as a direction control. The driver

differential outputs and the receiver differential inputs are connected internally

to form differential input/output (I/O) bus ports that are designed to offer minimum

loading to the bus whenever the driver is disabled or VCC = 0. These ports feature

wide positive and negative common-mode voltage ranges making the device suitable for

party-line applications.

The driver is designed to handle loads

up to 60 mA of sink or source current. The driver features positive- and

negative-current limiting and thermal shutdown for protection from line fault

conditions. Thermal shutdown is designed to occur at a junction temperature of

approximately 150°C. The receiver features a minimum input impedance of 12 kΩ, an

input sensitivity of ±200 mV, and a typical input hysteresis of 50 mV.

The SN75176A can be used in

transmission-line applications employing the SN75172 and SN75174 quadruple

differential line drivers and SN75173 and SN75175 quadruple differential line

receivers.

The SN75176A is characterized for

operation from 0°C to 70°C.