描述 Description

The SN55LBC176, SN65LBC176, SN65LBC176Q, and SN75LBC176 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 TIA/EIA-485-A (RS-485) and ISO 8482:1987(E).

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.

特性 Features

? Bidirectional Transceiver
? Meets or Exceeds the Requirements of ANSI Standard TIA/EIA.485.A and ISO 8482:1987(E)
? High-Speed Low-Power LinBiCMOS? Circuitry
? Designed for High-Speed Operation in Both Serial and Parallel Applications
? Low Skew
? Designed for Multipoint Transmission on Long Bus Lines in Noisy Environments
? Very Low Disabled Supply Current . . . 200 μA Maximum
? Wide Positive and Negative Input/Output Bus Voltage Ranges
? Thermal-Shutdown Protection
? Driver Positive-and Negative-Current Limiting
? Open-Circuit Failsafe Receiver Design
? Receiver Input Sensitivity . . . ±200 mV Max
? Receiver Input Hysteresis . . . 50 mV Typ
? Operates From a Single 5-V Supply
? Glitch-Free Power-Up and Power-Down Protection
? Available in Q-Temp Automotive HighRel Automotive ApplicationsConfiguration Control / Print Support Qualification to Automotive Standards
LinBiCMOS and LinASIC are trademarks of Texas Instruments Incorporated.