CD74HC646M

Overview

The CD74HC646M is an octal bus transceiver and register featuring three-state non-inverting outputs. It operates within a supply voltage range of 2V to 6V and supports a wide operating temperature range from -55°C to 125°C. The device includes independent registers for A and B buses, allowing data storage on low-to-high clock transitions. Typical propagation delay is 12ns at VCC = 5V with a 15pF load. It drives 15 LSTTL loads and offers high noise immunity.

Feature Summary

• Independent registers for A and B buses
• Three-state non-inverting outputs
• Wide operating temperature range

Applications

• Octal bus transceivers
• Data storage registers
• High-speed CMOS logic systems

Procurement Notes

Verify the specific ordering suffix when purchasing. The suffix '96' indicates tape and reel packaging, while other suffixes may denote different packaging types. Confirm the complete part number matches the required package style and quantity format for your assembly process.

Selection Notes

Select this component for applications requiring bidirectional data transfer with internal storage capabilities. Ensure the system voltage falls within the 2V to 6V range. Consider the 12ns typical propagation delay for timing constraints. Verify compatibility with LSTTL loads if interfacing with legacy logic families.

Part Context

This device belongs to the Texas Instruments HC series of high-speed CMOS logic. It functions as both a bus transceiver and a register, providing flexibility in data routing and storage. The SOIC-24 package allows for surface-mount installation, suitable for compact circuit designs requiring robust signal integrity.

Replacement Considerations

Public confirmed substitute part numbers: CD74HC646M96.