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Texas Instruments SN65176BDR RS 485 interface IC Differential Bus
Features 3
Description
The SN65176B and SN75176B differential bus 1• Bidirectional
Transceivers
transceivers are designed for bidirectional data
• Meet or Exceed the Requirements of ANSI communication on
multipoint bus transmission lines. Standards TIA/EIA-422-B and
TIA/EIA-485-A They are designed for balanced transmission lines
and ITU Recommendations V.11 and X.27 and meet ANSI Standards
TIA/EIA-422-B and
• Designed for Multipoint Transmission on TIA/EIA-485-A and ITU
Recommendations V.11 and
Long Bus Lines X.27. in Noisy Environments
• 3-State Driver and Receiver Outputs The SN65176B and SN75176B
devices combine a 3-
• Individual Driver and Receiver Enables state differential line
driver and a differential input line
receiver, both of which operate from a single 5-V
• Wide Positive and Negative Input/Output Bus
power supply. The driver and receiver have active- Voltage Ranges
high and active-low enables, respectively, that can be
• ± 60-mA Max Driver Output Capability connected together
externally to function as a
• Thermal Shutdown Protection direction control. The driver
differential outputs and
the receiver differential inputs are connected • Driver Positive
and Negative Current Limiting internally to form differential
input/output (I/O) bus
• 12-kΩ Min Receiver Input Impedance ports that are designed to
offer minimum loading to
• ± 200-mV Receiver Input Sensitivity the bus when the driver is
disabled or VCC = 0. These
ports feature wide positive and negative common- • 50-mV Typ
Receiver Input Hysteresis
mode voltage ranges, making the device suitable for
• Operate From Single 5-V Supply
Pin Configuration and Functions
Parameter Measurement Information
Parameter Measurement Information
Overview 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 devices 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 devices 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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