M74HCT646RM13TR

Overview

The M74HCT646RM13TR is an octal bus transceiver and register with 3-state outputs manufactured by STMicroelectronics. It operates within a supply voltage range of 4.5V to 5.5V. The device features a maximum clock frequency of 60 MHz at 4.5V. Propagation delays are specified between 20ns and 48ns depending on load capacitance and temperature. Quiescent supply current is 4μA maximum at 25°C. It utilizes SO-24 packaging.

Feature Summary

• Octal bus transceiver and register configuration with 3-state outputs
• Multiplexed transmission capability allowing data transfer directly from input buses or internal registers
• D-type flip-flops for storing data on low-to-high clock transitions
• Control circuitry for direction, enable, and source selection

Applications

• High-speed data bus interfacing
• Memory buffer applications
• Digital signal routing systems

Procurement Notes

Verify component authenticity through authorized channels as the product is marked obsolete. Confirm datasheet revision and package type matches design requirements. Check RoHS compliance status before integration. Ensure storage conditions adhere to specified limits to prevent degradation.

Selection Notes

Select this component for designs requiring bidirectional octal data transfer with latching capabilities. Verify logic level compatibility with TTL outputs if interfacing with legacy systems. Consider the 3-state output feature for bus sharing applications. Evaluate thermal dissipation requirements based on operating temperature ranges.

Part Context

This part belongs to the 74HCT series of high-speed CMOS logic devices. It is functionally compatible with the standard 74 series 646 pinout. The RM13 suffix indicates tape and reel packaging in an SO-24 format. It represents an advanced CMOS implementation of traditional bipolar logic functions.

Replacement Considerations

Direct substitutes include other manufacturers' 74HCT646 variants in SO-24 packages. Verify pin compatibility and electrical specifications match original requirements. Cross-reference with equivalent parts from NXP or Texas Instruments.