CD74HC640EX

Overview

The CD74HC640EX is an octal bus transceiver from the HC/UH series manufactured by Harris Corporation. It features one functional unit with eight bits per unit and true output polarity. The device utilizes CMOS technology and is housed in a 24-pin Plastic Dual In-Line Package (PDIP). It supports bidirectional data transmission with independent control capabilities. The component operates within a temperature range of -55 °C to 125 °C and provides three-state outputs.

Feature Summary

• Octal bidirectional bus interface for data transmission
• Three-state outputs compatible with bus systems
• Independent direction control for registered or real-time data

Applications

• Bidirectional data bus interfaces
• Multiplexed transmission of registered data
• Real-time data transmission systems

Procurement Notes

Verify the manufacturer designation, as Harris Corporation has undergone corporate changes affecting product lines. Confirm the specific package type and pinout compatibility with existing designs. Check RoHS compliance status, as older Harris components may not meet current environmental standards. Ensure the operating temperature range meets system requirements.

Selection Notes

Select this component for applications requiring an octal bus transceiver with true output polarity. Consider the PDIP24 package for through-hole mounting needs. Verify voltage supply compatibility with the HC/UH series specifications. Evaluate thermal performance given the wide operating temperature range.

Part Context

This part belongs to the 74HC logic family, known for high-speed CMOS operation. It is functionally similar to other octal bus transceivers like the 74HC640 but may have specific manufacturing attributes associated with Harris Corporation production. The 'EX' suffix typically denotes a specific package or processing variant within the company's catalog.

Replacement Considerations

Compatible replacements include the NXP 74HC640 or Texas Instruments CD74HC640 variants. Verify pin compatibility and electrical characteristics before substitution. Note that manufacturer-specific variations may exist.