CD74FCT646ATM

Overview

The CD74FCT646ATM is an octal registered bus transceiver manufactured by Harris Corporation, belonging to the FCT logic series. It features a single functional unit with eight bits per element and non-inverting true output polarity. The device utilizes CMOS technology and provides three-state outputs for bidirectional data transmission. It operates within a supply voltage range of 4.5V to 5.5V and supports a wide operating temperature range from -55°C to 125°C. The component is housed in a 24-pin Small Outline package (PDSO24) designed for surface mount installation.

Feature Summary

• Bidirectional octal registered bus transceiver with independent direction control
• Multiplexed transmission capability allowing selection between registered or real-time data paths
• Three-state outputs compatible with TTL input and output levels

Applications

• High-speed data bus interfaces requiring registered storage
• System memory and I/O mapping applications
• Bus-oriented architectures needing multiplexed data transmission

Procurement Notes

Verify the manufacturer origin carefully, as Harris Corporation's logic assets were acquired by Texas Instruments. Confirm whether the specific part number corresponds to original Harris production or subsequent TI manufacturing runs. Check RoHS compliance status, as original Harris parts may not meet current environmental regulations compared to modern equivalents.

Selection Notes

Select this component when designing systems that require octal width data transfer with internal latching capabilities. The FCT series offers faster switching speeds than standard HCT logic while maintaining CMOS power efficiency. Ensure the design accommodates the specific 24-SOIC footprint and thermal requirements for the extended industrial temperature range.

Part Context

This component is part of the broader 74FCT family of high-speed CMOS logic devices. The 646 variant specifically addresses applications needing bidirectional data flow with registration. It serves as a bridge between microprocessors and peripheral devices, facilitating efficient data handling in complex digital systems through its registered buffer architecture.