74LCX2244WM

Overview

The Fairchild Semiconductor 74LCX2244WM is a low-voltage buffer and line driver featuring two non-inverting elements with four bits per element. It provides 3-state outputs and supports 5V tolerant inputs and outputs, enabling safe interfacing between 2.5V or 3.3V logic systems and 5V environments. The device incorporates 26-ohm series resistors in the output paths to reduce signal reflections and electromagnetic interference (EMI). Fabricated using advanced CMOS technology, it ensures high-speed operation with a maximum propagation delay of 7.5 ns at 2.7V and 6.5 ns at 3.3V, while maintaining low power dissipation.

Feature Summary

• Features 5V tolerant inputs and outputs for direct interfacing with legacy 5V logic systems
• Incorporates 26-ohm series output resistors to minimize signal ringing and EMI emissions
• Provides 3-state outputs to facilitate bus-oriented transmission and reception applications

Applications

• Memory address drivers in low-voltage computing systems
• Clock distribution networks requiring controlled slew rates
• Bus-oriented transmitter and receiver circuits

Procurement Notes

Verify the specific suffix 'WM' against current onsemi datasheets, as Fairchild Semiconductor has been integrated into onsemi. Confirm package dimensions match the 20-Lead Small Outline Integrated Circuit (SOIC) standard JEDEC MS-013. Ensure compatibility with RoHS directives if required by your manufacturing process. Cross-reference part numbers carefully due to potential naming changes post-integration.

Selection Notes

Select this component when designing interfaces between 2.5V/3.3V logic domains and 5V peripherals. The built-in series resistors make it suitable for high-speed data lines where signal integrity is critical. Consider the 20-pin SOIC package constraints for PCB layout. Verify that the 3-state control signals align with your system's bus management requirements.

Part Context

This part belongs to the 74LCX family of low-voltage CMOS logic devices. It shares functional similarities with the DM74LCX244 but differs in channel configuration, offering two 4-bit buffers instead of one 8-bit buffer. The WM suffix typically denotes a specific tape-and-reel packaging option for surface-mount assembly.

Replacement Considerations

The DM74LCX244SJX is a related device within the same family but offers eight channels rather than two. Verify pinout compatibility before substitution. Check onsemi documentation for any updated ordering information following the Fairchild integration.