1 Features

• Meet or exceed the requirements of TIA/EIA-422-

B,TIA/EIA-485-A1 and ITU recommendations V.11

and X.27

• Operate at data rates up to 35 Mbaud

• Four skew limits available:

– SN65ALS176: 15 ns

– SN75ALS176: 10 ns

– SN75ALS176A: 7.5 ns

– SN75ALS176B: 5 ns

• Designed for multipoint transmission onlong bus

lines in noisy environments

• Low supply-current requirements: 30 mA max

• Wide positive and negative input/output busvoltage

ranges

• Thermal shutdown protection

• Driver positive and negative current limiting

• Receiver input hysteresis

• Glitch-free power-up and power-down protection

• Receiver open-circuit fail-safe design

2 Description

The SN65ALS176 and SN75ALS176 series

differential bus transceivers are designed for

bidirectional data communication on multipoint bus

transmission lines. The devices are designed for

balanced transmission lines and meet TIA/EIA-422-B,

TIA/EIA-485-A, and ITU Recommendations V.11 and

X.27.

The SN65ALS176 and SN75ALS176 series combine

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 activehigh

and active-low enables, respectively, that can

be connected together externally to function as a

direction control. The driver differential outputs and

the receiver differential inputs are connected internally

to form a differential input/output (I/O) bus port that

is designed to offer minimum loading to the bus

when the driver is disabled or VCC = 0. This port

features wide positive and negative common-mode

voltage ranges, making the device suitable for partyline

applications.

The SN65ALS176 is characterized for operation

from –40°C to 85°C. The SN75ALS176 series is

characterized for operation from 0°C to 70°C.