SN74F657DWR

Buffers, Drivers, Receivers, Transceivers Overview

The SN74F657DWR is an octal bus transceiver with integrated parity generation and checking, housed in a 24-pin SOIC package. It operates on a 4.5V to 5.5V supply voltage within a 0°C to 70°C temperature range. The device features high-impedance NPN inputs drawing only 70 μA. B-port outputs sink 64 mA and source 15 mA, while A-port outputs sink 24 mA. Propagation delays for data paths are up to 8 ns, and parity/ERR path delays reach 22.5 ns.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Integrates bidirectional octal bus transceivers with an 8-bit parity generator/checker circuit
• Provides high-output drive capability with asymmetric current sinking between ports
• Supports configurable odd or even parity systems via dedicated control input
• Features high-impedance NPN inputs to minimize bus loading effects

Buffers, Drivers, Receivers, Transceivers Applications

• Bus-oriented applications requiring error detection
• Data transmission systems utilizing parity verification
• Bidirectional data transfer interfaces

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix matches the required packaging format, as the 'DW' designation indicates a plastic small-outline package. Confirm RoHS compliance status and moisture sensitivity level ratings against project requirements. Ensure the selected variant aligns with the specified operating temperature range of 0°C to 70°C for commercial applications.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when combining octal bus driving with parity checking functionality is necessary. It serves as a combined alternative to separate transceiver and parity generator chips. Consider the asymmetric output drive capabilities where the B port provides higher sinking current than the A port. Verify that the 3-state output control meets system timing requirements.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the Texas Instruments SN74F logic family, characterized by high-speed operation. It combines the functions of the SN74F245 transceiver and SN74F280B parity generator into a single package. The device utilizes standard TTL-compatible input levels and offers 3-state outputs for effective bus management in digital systems.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Public confirmed substitute part numbers: SN74F657DW.