MC74LCX244M

Overview

The MC74LCX244M is a low-voltage CMOS octal buffer manufactured by onsemi. It features five-volt tolerant inputs and outputs, allowing safe interfacing with 5V devices while operating at lower supply voltages. The device provides non-inverting logic functions with three-state outputs for effective bus driving. It utilizes advanced sub-micron silicon gate technology to achieve high-speed performance comparable to 5V AC/ACT families while maintaining significantly lower power consumption. The component includes protection circuits against static discharge and transient excess voltage.

Feature Summary

• Features five-volt tolerant inputs and outputs for direct interface with 5V TTL logic environments
• Provides three-state non-inverting buffering suitable for memory address and data bus applications
• Includes IOFF support to maintain high-impedance states when the power supply is off
• Offers robust electrostatic discharge protection exceeding 2000V under human model testing

Applications

• Memory address drivers in computer systems
• Bus-oriented transceivers connecting different voltage domains
• Clock drivers requiring signal isolation and drive strength
• TTL-to-CMOS level translation interfaces

Procurement Notes

Verify the specific suffix code to confirm the package type, as MC74LCX244 variants exist in multiple form factors including TSSOP and SOIC. Confirm RoHS compliance status and lead times directly with authorized distributors or the manufacturer. Ensure the ordering part number matches the required pin configuration and electrical specifications for the target application design.

Selection Notes

Select this component when designing systems that require buffering between 3.3V or 2.5V logic cores and 5V peripheral devices. The five-volt tolerance eliminates the need for additional level-shifting circuitry. Consider the three-state output capability for multiplexed bus architectures where multiple drivers share a common line. Evaluate the propagation delay specifications against the system timing requirements to ensure signal integrity.

Part Context

This part belongs to the 74LCX family of low-voltage CMOS logic devices from onsemi. The LCX series is designed to replace older 5V logic families in modern low-power applications. It shares functional compatibility with standard 74-series logic but operates at reduced voltages. The octal buffer configuration provides eight independent channels within a single integrated circuit package.

Replacement Considerations

Direct substitutes include other 74LCX244 variants from onsemi such as MC74LCX244D or MC74LCX244MTC, provided the package style matches the PCB footprint. Cross-manufacturer equivalents like SN74LCX244 are functionally compatible but require verification of pinout and electrical characteristics.