SN75LBC176

差动总线收发器

The SN55LBC176, SN65LBC176, SN65LBC176Q, and differential bus transceivers are monolithic, integrated circuits designed for bidirectional data communication on multipoint bus-transmission lines. They are designed for balanced transmission lines and meet ANSI Standard A/EIA-485-A RS-485 and ISO 8482:1987E.

The SN55LBC176, SN65LBC176, SN65LBC176Q, and SN75LBC176 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, which can externally connect together to function as a direction control. The driver differential outputs and the receiver differential inputs connect internally to form a differential input/output I/O bus port that is designed to offer minimum loading to the bus whenever the driver is disabled or VCC = 0. This port features wide positive and negative common-mode voltage ranges, making the device suitable for party-line applications. Very low device supply current can be achieved by disabling the driver and the receiver.

These transceivers are suitable for ANSI Standard TIA/EIA-485 RS-485 and ISO 8482 applications to the extent that they are specified in the operating conditions and characteristics section of this data sheet. Certain limits contained in TIA/EIA-485-A and ISO 8482:1987 E are not met or cannot be tested over the entire military temperature range.

The SN55LBC176 is characterized for operation from –55°C to 125°C. The SN65LBC176 is characterized for operation from –40°C to 85°C, and the SN65LBC176Q is characterized for operation from –40°C to 125°C. The SN75LBC176 is characterized for operation from 0°C to 70°C.

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Bidirectional Transceiver

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Meets or Exceeds the Requirements of ANSI Standard TIA/EIA.485.A and

ISO 8482:1987E

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High-Speed Low-Power LinBiCMOS™ Circuitry

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Designed for High-Speed Operation in Both Serial and Parallel Applications

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Low Skew

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Designed for Multipoint Transmission on Long Bus Lines in Noisy Environments

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Very Low Disabled Supply Current . . . 200 µA Maximum

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Wide Positive and Negative Input/Output Bus Voltage Ranges

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Thermal-Shutdown Protection

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Driver Positive-and Negative-Current Limiting

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Open-Circuit Failsafe Receiver Design

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Receiver Input Sensitivity . . . ±200 mV Max

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Receiver Input Hysteresis . . . 50 mV Typ

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Operates From a Single 5-V Supply

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Glitch-Free Power-Up and Power-Down Protection

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Available in Q-Temp Automotive HighRel Automotive ApplicationsConfiguration

Control / Print Support Qualification to Automotive Standards

LinBiCMOS and LinASIC are trademarks of Texas Instruments Incorporated.