SN75ALS171 - 三路差动总线收发器

SN75ALS171是TI德州仪器公司的一款SCSI并行接口(SPI)产品，SN75ALS171是三路差动总线收发器，本站介绍了SN75ALS171的封装应用图解、特点和优点、功能等，并给出了与SN75ALS171相关的TI元器件型号供参考。

SN75ALS171 - 三路差动总线收发器 - SCSI并行接口(SPI) - SCSI终端、收发器 - 德州仪器

产品描述

The SN75ALS171 and the SN75ALS171A triple 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 each driver meets ANSI Standards EIA/TIA-422-B and RS-485 and both the drivers and receivers meet ITU Recommendation V.11. The SN75ALS171A is designed for FAST-20 SCSI and can transmit or receive data pulses as short as 30 ns with a maximum skew of 5 ns.

The SN75ALS171 and the SN75ALS171A operate from a single 5-V power supply. The drivers and receivers have individual active-high and active-low enables, respectively, which can be externally connected together to function as a direction control. The driver differential output and the receiver differential input pairs 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 is at 0 V. These ports feature wide positive and negative common-mode voltage ranges making the device suitable for party-line applications.

The SN75ALS171 and the SN75ALS171A are characterized for operation from 0°C to 70°C.

H = high level, L = low level, ? = indeterminate, X = irrelevant, Z = high impedance (off)

产品特性

Three Bidirectional Transceivers
Driver Meets or Exceeds the Requirements of ANSI EIA/TIA-422-B and RS-485 and ITU Recommendation V.11
Two Skew Limits Available
Designed to Operate Up to 20 Million Data Transfers per Second (FAST-20 SCSI)
High-Speed Advanced Low-Power Schottky Circuitry
Low Pulse Skew...5 ns Max
Designed for Multipoint Transmission on Long Bus Lines in Noisy Environments
Features Independent Driver Enables and Combined Receiver Enables
Wide Positive and Negative Input/Output Bus Voltages Ranges
Driver Output Capacity...±60 mA
Thermal Shutdown Protection
Driver Positive- and Negative-Current Limiting
Receiver Input Impedances...12 k Min
Receiver Input Sensitivity...±300 mV Max
Receiver Input Hysteresis...60 mV Typ
Operates From a Single 5-V Supply
Glitch-Free Power-Up and Power-Down Protection

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