SN75176A Electronic IC Chips DIFFERENTIAL BUS TRANSCEIVER

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SN75176A DIFFERENTIAL BUS TRANSCEIVER

• Bidirectional Transceiver
• Meets or Exceeds the Requirements of ANSI Standards EIA/TIA-422-B and ITU Recommendation V.11
• 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 Limiting
• Receiver Input Impedance . . . 12 kΩ Min

• Receiver Input Sensitivity... ±200 mV
• Receiver Input Hysteresis . . . 50 mV Typ
• Operates From Single 5-V Supply
• Low Power Requirements

description

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 V_CC = 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.

absolute maximum ratings over operating free-air temperature range

(unless otherwise noted)†

Supply voltage, V_CC (see Note 1)  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7 V

Voltage range at any bus terminal  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –10 V to 15 V

Enable input voltage, V_I . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.5 V

Continuous total power dissipation  . . . . . . . . . . . . . . . . . . . . . . . . See Dissipation Rating Table

Operating free-air temperature range, T_A  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C

Storage temperature range, Tstg  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  – 65°C to 150°C

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds  . . . . . . . . . . . . . . . . . . .  260°C

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: All voltage values, except differential input/output bus voltage, are with respect to network ground terminal.

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          logic symbol†                                                       logic diagram (positive logic)