SN74F657NT

Buffers, Drivers, Receivers, Transceivers Overview

The SN74F657NT is an octal transceiver with parity generator/checker and 3-state outputs. It combines 'F245 and 'F280B functions in one package. The device features high-impedance N-P-N inputs for reduced loading (70 μA in low and high states). High output drive capability allows B port outputs to sink 64 mA and source 15 mA. Input diodes are included for termination effects. The T/R input determines data flow direction, while OE controls the 3-state condition. ODD/EVEN selects parity type. Characterized for operation from 0°C to 70°C.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Combines bidirectional octal bus transceiver and 8-bit parity generator/checker functions
• Features high-impedance N-P-N inputs to reduce circuit loading
• Provides strong output drive capabilities with specific current sinking and sourcing ratings
• Includes built-in input diodes designed to handle termination effects

Buffers, Drivers, Receivers, Transceivers Applications

• Bus-oriented applications requiring bidirectional data transfer
• Systems utilizing parity generation or error checking mechanisms
• Digital circuits needing combined buffering and logic verification

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the exact suffix against official Texas Instruments documentation to confirm pinout and package dimensions. Ensure the operating temperature range meets your system requirements. Confirm RoHS compliance status through the manufacturer's latest ordering information. Validate that the supply voltage matches your design specifications before procurement.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when a single integrated solution for both data transmission and parity checking is required. It serves as a direct functional replacement for separate transceiver and parity chip combinations. Consider the high output drive strength if driving heavy bus loads. Verify compatibility with your system's voltage levels and signal timing constraints.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the SN74F series of high-speed TTL logic devices. It integrates functionalities typically found in separate SN74F245 and SN74F280B components. The device is designed for standard plastic DIP packages and small-outline configurations. It supports bidirectional data flow controlled by dedicated direction pins.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

SN74F245 and SN74F280B can be used together as a functional substitute.