描述 Description

The SN65LBC170 and SN75LBC170 are monolithic integrated circuits designed for bidirectional data communication on multipoint bus-transmission lines. Potential applications include serial or parallel data transmission, cabled peripheral buses with twin axial, ribbon, or twisted-pair cabling. These devices are suitable for FAST-20 SCSI and can transmit or receive data pulses as short as 25 ns, with skew less than 3 ns.

These devices combine three 3-state differential line drivers and three differential input line receivers, all of which operate from a single 5-V power supply.

The driver differential outputs and the receiver differential inputs are connected internally to form three differential input/output (I/O) bus ports that are designed to offer minimum loading to the bus whenever the driver is disabled or VCC = 0. These ports feature a wide common-mode voltage range making the device suitable for party-line applications over long cable runs.

The driver?s active-high enable and the receiver?s active-low enable are tied together internally and provide a direction input for each driver/receiver pair.

The SN75LBC170 is characterized for operation over the temperature range of 0°C to 70°C. The SN65LBC170 is characterized for operation over the temperature range of ?40°C to 85°C.

特性 Features

? Three Differential Transceivers in One Package
? Signaling Rates? Up to 30 Mbps
? Low Power and High Speed
? Designed for TIA/EIA-485, TIA/EIA-422, ISO 8482, and ANSI X3.277 (HVD SCSI Fast-20) Applications
? Common-Mode Bus Voltage Range –7 V to 12 V
? ESD Protection on Bus Terminals Exceeds 12 kV
? Driver Output Current up to ±60 mA
? Thermal Shutdown Protection
? Driver Positive and Negative Current Limiting
? Power-Up, Power-Down Glitch-Free Operation
? Pin-Compatible With the SN75ALS170
? Available in Shrink Small-Outline Package