CD74FCT646SM

Overview

The CD74FCT646SM 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 a 24-pin Small Outline (SOP) package with plastic/epoxy body material. 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 outputs are three-state capable, designed for bidirectional data transmission on bus-oriented systems.

Feature Summary

• Octal Registered Bus Transceiver architecture supporting 8-bit data transfer
• Non-inverting true output polarity for direct signal routing
• Three-state output capability for efficient bus isolation
• Direction control input for managing bidirectional data flow

Applications

• Bus-oriented memory and I/O systems requiring registered data latching
• Clocking data registers in high-speed digital circuits
• Bidirectional bus drivers for multiplexed transmission environments

Procurement Notes

Verify component authenticity through official manufacturer channels or authorized distributors. Confirm RoHS compliance status as historical records indicate non-compliance. Ensure the specific suffix matches the required SOP-24 package variant. Check for moisture sensitivity level requirements during storage and handling procedures prior to assembly.

Selection Notes

Select this component when an octal registered transceiver with non-inverting outputs is required for bus applications. The FCT series offers compatibility with standard CMOS logic levels while providing higher drive capabilities. Consider the 24-SOP package constraints and the specified temperature range for industrial or commercial deployment scenarios.

Part Context

This part belongs to the Harris Corporation FCT logic family, which bridges Fast CMOS and Fast TTL performance characteristics. The 646 designation specifically identifies the octal registered bus transceiver function within this lineage. Similar variants exist in the ACT and HCT series, differing primarily in speed and voltage thresholds.