Sunday, August 5, 2012

Texas Instruments SN65176B, SN75176B pdf datasheet download

SN65176B, SN75176B

􀀀 Bidirectional Transceivers
􀀀 Meet or Exceed the Requirements of ANSI
Standards TIA/EIA-422-B and TIA/EIA-485-A
and ITU Recommendations V.11 and X.27
􀀀 Designed for Multipoint Transmission on
Long Bus Lines in Noisy Environments
􀀀 3-State Driver and Receiver Outputs
􀀀 Individual Driver and Receiver Enables
􀀀 Wide Positive and Negative Input/Output
Bus Voltage Ranges
􀀀 Driver Output Capability . . . ±60 mA Max
􀀀 Thermal Shutdown Protection
􀀀 Driver Positive and Negative Current
􀀀 Receiver Input Impedance . . . 12 kΩ Min
􀀀 Receiver Input Sensitivity . . . ±200 mV
􀀀 Receiver Input Hysteresis . . . 50 mV Typ
􀀀 Operate From Single 5-V Supply

description/ordering information

The SN65176B and SN75176B differential bus transceivers are integrated circuits designed for bidirectional
data communication on multipoint bus transmission lines. They are designed for balanced transmission lines
and meet ANSI Standards TIA/EIA-422-B and TIA/EIA-485-A and ITU Recommendations V.11 and X.27.
The SN65176B and SN75176B 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 active-high 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 differential input/output
(I/O) bus ports that are designed to offer minimum loading to the bus when 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 for 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 SN65176B and SN75176B can be used in transmission-line applications employing the SN75172 and
SN75174 quadruple differential line drivers and SN75173 and SN75175 quadruple differential line receivers.

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