CD74HCT646M

Overview

The CD74HCT646M is an octal bus transceiver and register manufactured by Harris Corporation. It operates within a supply voltage range of 4.5V to 5.5V and features non-inverting logic with three-state outputs. The device provides bidirectional data transmission control and supports registered or real-time data multiplexing. It is housed in a 24-SOIC surface-mount package and functions across an industrial temperature range of -55°C to 125°C.

Feature Summary

• Bidirectional octal bus transceiver with registered functionality
• Three-state output capability for bus line isolation
• Direction control input for independent data flow management

Applications

• Multiprocessor system data bus interfacing
• Memory-to-memory data transfer applications
• Control signal routing in industrial automation systems

Procurement Notes

Verify the manufacturer origin, as this component was originally produced by Harris Corporation. Confirm RoHS compliance status, as original Harris versions may not meet current environmental standards. Ensure the 24-SOIC package dimensions match the design requirements. Check for moisture sensitivity level (MSL) ratings appropriate for the assembly process.

Selection Notes

Select this component when an octal bus transceiver with registered storage is required. The HCT logic series ensures compatibility with standard TTL inputs while operating at CMOS voltages. Verify that the 24-SOIC package fits the PCB layout constraints. Consider the bidirectional nature of the device for complex data routing architectures.

Part Context

This part belongs to the 74HCT646 family of high-speed CMOS logic devices. It serves as a bridge between microprocessors and peripheral devices. The device integrates both buffering and latching capabilities in a single package. It is designed for high-performance digital systems requiring reliable data transmission.

Replacement Considerations

Texas Instruments CD74HCT646M96 is a confirmed equivalent part number.