SN75971B2DL

Drivers, Receivers, Transceivers Overview

The SN75971B2DL is a 9-channel RS-485 transceiver designed as the data converter component for differential SCSI systems. It operates with a supply voltage of 5 V (range 4.75 V to 5.25 V) and supports data transfer rates up to 20 Mxfer. The device features bidirectional single-ended inputs/outputs rated at ±16 mA and bipolar differential I/Os compliant with EIA-485 and ISO-8482 standards. It includes thermal shutdown protection, positive/negative current limiting, and power-up/down glitch protection. Packaged in a 56-pin SSOP, it functions alongside the SN75970B control transceiver to implement Ultra-SCSI buses.

Drivers, Receivers, Transceivers Feature Summary

• Provides high-voltage differential SCSI conversion from single-ended controllers when paired with the SN75970B control transceiver.
• Features independent direction latching for each channel to manage data flow between single-ended and differential sides.
• Includes internal reset logic that disables all outputs and clears latches upon power-up, thermal shutdown, or external signal assertion.

Drivers, Receivers, Transceivers Applications

• Implementation of 16-bit Ultra-SCSI (Fast-20) bus architectures using minimal external components.
• Conversion of single-ended SCSI controller signals to differential SCSI bus signals.
• Integration into compact storage subsystems requiring space-efficient 56-pin packaging solutions.

Drivers, Receivers, Transceivers Procurement Notes

Verify the specific B2 suffix indicates the 20 Mxfer speed grade during procurement. Confirm the package type matches the required board layout, as the DL suffix denotes a shrink small-outline package (SSOP). Ensure compatibility with the companion SN75970B control transceiver for proper system operation.

Drivers, Receivers, Transceivers Selection Notes

Select the SN75971B2DL for applications requiring 20 Mxfer data rates; use the B1 variant for 10 Mxfer requirements. This component must be used in conjunction with the SN75970B control transceiver to decode SCSI control signals and manage transceiver direction. Verify that the design accommodates the 56-pin SSOP footprint and 5 V supply constraints.

Drivers, Receivers, Transceivers Part Context

The SN75971B series serves as the data path interface in Texas Instruments' differential SCSI solution. It complements the SN75970B control transceiver, which handles bus arbitration and direction control. Together, these devices enable the transition from legacy single-ended SCSI controllers to high-performance differential SCSI environments.

Drivers, Receivers, Transceivers Replacement Considerations

Public confirmed substitute part numbers: SN75971B2DGG.