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.