74HC640N,652

Overview

The NXP 74HC640N,652 is an octal bus transceiver featuring inverting three-state outputs. It operates within a supply voltage range of 2 V to 6 V and supports bidirectional data transfer. The device utilizes high-speed silicon-gate CMOS technology and maintains pin compatibility with low-power Schottky TTL (LSTTL). Packaged in a standard 20-pin DIP format, it is designed for robust digital signal interfacing.

Feature Summary

• Octal bidirectional bus interface capability
• Inverting three-state output configuration
• High-speed silicon-gate CMOS construction

Applications

• Bidirectional bus driver applications
• Digital signal interfacing between logic families
• Memory address and data bus buffering

Procurement Notes

Verify the specific suffix '652' against official NXP documentation to confirm package dimensions and tape-and-reel specifications if applicable. Ensure the procurement channel provides valid RoHS compliance certificates. Confirm that the DIP-20 package matches the target PCB footprint requirements before finalizing orders.

Selection Notes

Select this component when an octal transceiver with inverting functionality and three-state control is required. It serves as a direct replacement for LSTTL equivalents in mixed-voltage systems. Verify that the operating voltage range aligns with the system's power supply rails and that the DIP-20 package fits the available board space.

Part Context

This part belongs to the 74HC series of high-speed CMOS logic devices manufactured by NXP Semiconductors. The 74HC640 specifically functions as an octal bus transceiver. The 'N' designation indicates a through-hole DIP package, while '652' typically denotes specific packaging or ordering details defined by the manufacturer.

Replacement Considerations

The 74HC643 is a non-inverting variant within the same family. Other compatible octal transceivers include the 74HC244 and 74HC245, though polarity and control logic may differ. Verify functional equivalence before substitution.