I74F657D,118

Overview

The I74F657D,118 is an octal transceiver with an integrated 8-bit parity generator and checker. It combines the functions of a 3-state bus driver and parity logic in a single package. The device features non-inverting buffers with high-impedance inputs to reduce loading on the bus. It supports bidirectional data flow controlled by a Transmit/Receive input. The component operates within an industrial temperature range of -40 °C to +85 °C.

Feature Summary

• Integrates octal transceiver and 8-bit parity generation/checking capabilities
• Provides high-impedance base inputs for reduced bus loading
• Features 3-state outputs with high current sinking capability
• Supports configurable odd or even parity selection

Applications

• Bus-oriented applications requiring high output drive
• Systems needing light bus loading conditions
• Industrial control environments

Procurement Notes

Verify that the ordering code matches the specific industrial temperature range variant required for your application. Confirm the package type corresponds to the SOT137-1 designation for the plastic small outline package. Ensure compatibility with the 5V supply voltage specifications outlined in the recommended operating conditions before finalizing procurement.

Selection Notes

Select this component when both bidirectional data transmission and parity error checking are required in a single footprint. It serves as a direct replacement for designs previously using separate transceiver and parity chip combinations. Consider the high output drive capability if driving multiple loads or long traces on the bus.

Part Context

This part belongs to the 74F series of high-speed TTL logic devices. It supersedes earlier product specifications from 1990. The device was originally manufactured by Philips Semiconductors. It is designed to operate reliably under industrial environmental conditions while maintaining fast propagation delays.

Replacement Considerations

The datasheet indicates it combines the functions of the 74F245 and 74F280A. Designers replacing discrete components should verify pinout compatibility and ensure the combined functionality meets the system requirements without additional external logic.