74HC640D,653

Overview

The NXP USA Inc. 74HC640D,653 is an octal bus transceiver featuring inverting 3-state outputs compatible with low power Schottky TTL (LSTTL). It operates within a supply voltage range of 2V to 6V and supports bidirectional data transfer. The device utilizes CMOS technology and includes common control for direction and output enable functions. It is housed in a PDSO20 package and is designed for high-speed digital applications requiring bus interface capabilities.

Feature Summary

• Octal bidirectional bus interface capability
• Inverting 3-state outputs for both send and receive directions
• CMOS construction ensuring compatibility with LSTTL logic levels

Applications

• Bus driver applications
• Bidirectional data transmission interfaces
• Memory-to-memory or memory-to-I/O transfers

Procurement Notes

Verify the specific suffix 653 against official Nexperia/NXP documentation to confirm tape-and-reel packaging specifications. Ensure the component meets RoHS compliance requirements if applicable to your design constraints. Cross-reference the manufacturer part number with current datasheets to validate pinout and electrical characteristics before finalizing procurement orders.

Selection Notes

Select this component when an octal width bus transceiver with inverting functionality is required. It serves as a suitable alternative for designs needing 3-state isolation on bidirectional buses. Consider the 20-pin SO package constraint and ensure the operating voltage range aligns with the system's power supply rails.

Part Context

This component belongs to the 74HC series of high-speed CMOS logic devices manufactured by NXP Semiconductors. The 74HC640 specifically addresses the need for wide-data bus interfacing with tri-state control. It is widely used in microprocessor systems where data directionality and bus isolation are critical for signal integrity.

Replacement Considerations

Compatible substitutes include other 74HC640 variants from different manufacturers such as IN74AC640 or KK74LV640, provided they maintain the same octal inverting 3-state functionality and pinout compatibility.