CD74FCT646ATQM96

Overview

The CD74FCT646ATQM96 is a registered bus transceiver from the FCT series, manufactured by Harris Corporation. It features two functional units, each handling eight bits of data with true output polarity. The device utilizes CMOS technology and is housed in a PDSO56 small outline package. It operates within a supply voltage range of 4.5 V to 5.5 V, with a nominal rating of 5 V. The component supports an operating temperature range from -40 °C to 85 °C and exhibits a propagation delay of 6.3 ns. Outputs are three-state with series resistors.

Feature Summary

• Integrated bus hold inputs eliminate the need for external pull-up resistors
• Direction control functionality manages data flow between ports
• Three-state outputs include series resistors for signal integrity

Applications

• High-speed data bus interfaces requiring registered buffering
• Memory systems utilizing 8-bit wide data paths
• Industrial control networks operating within extended temperature ranges

Procurement Notes

Verify the specific suffix M96 against official Harris or successor manufacturer documentation to confirm pinout compatibility and tape-and-reel specifications. Ensure the source document explicitly lists this exact part number variant, as suffixes often dictate packaging or environmental qualifications distinct from standard versions.

Selection Notes

Select this component when a registered 8-bit bidirectional buffer with direction control is required. The FCT series offers faster switching speeds compared to standard HCT logic. Verify that the 56-pin SOIC package fits the board layout constraints and that the 4.5V to 5.5V supply range matches the system power architecture.

Part Context

This device belongs to the Harris FCT (Fast CMOS Technology) family, designed for high-performance digital applications. The 74FCT646 specifically addresses the need for registered data latching on bidirectional buses, providing timing control and noise immunity superior to unbuffered alternatives in complex digital systems.

Replacement Considerations

Cross-reference with Texas Instruments CY74FCT646 variants for potential pin-compatible substitutes. Verify electrical parameters and package dimensions before substitution, as manufacturer transitions may affect specific mechanical tolerances or internal circuitry characteristics.