Product details


Number of receivers 3 Number of transmitters 3 Duplex Half Supply voltage (Nom) (V) 5 Signaling rate (Max) (Mbps) 30 IEC 61000-4-2 contact (+/- kV) None Fault protection (V) -10 to 15 Common mode range -7 to 12 Number of nodes 32 Isolated No ICC (Max) (mA) 20 Rating Catalog Operating temperature range (C) 0 to 70 open-in-new Find other RS-485 & RS-422 transceivers

Package | Pins | Size

SSOP (DB) 16 48 mm² 6.2 x 7.8 open-in-new Find other RS-485 & RS-422 transceivers


  • 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

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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.

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Type Title Date
* Datasheet Triple Differential Transceivers datasheet (Rev. C) Mar. 31, 2005

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