74LCX240WMX

Overview

The Fairchild Semiconductor 74LCX240WMX is an octal buffer and line driver featuring three-state outputs, manufactured using advanced CMOS technology. It operates within a supply voltage range of 2.3V to 3.6V and provides 5V tolerant inputs and outputs for interfacing with 5V signal environments. The device delivers high-speed performance with a maximum propagation delay of 6.5ns at VCC = 3.3V and supports ±24mA output drive current at VCC = 3.0V. Packaged in a 20-lead Wide SOIC (SOIC-W), it includes patented noise/EMI reduction circuitry and exhibits latch-up performance exceeding 500mA.

Feature Summary

• Provides eight non-inverting buffers with three-state outputs for bus-oriented transmission
• Features 5V tolerant inputs and outputs to interface between low-voltage and 5V systems
• Incorporates patented noise and EMI reduction circuitry for signal integrity
• Supports live insertion and withdrawal via power-down high impedance states

Applications

• Memory address drivers
• Clock drivers
• Bus-oriented transmitter/receiver circuits

Procurement Notes

Verify the specific suffix 'WMX' against official datasheets to confirm package dimensions and tape-and-reel specifications. Ensure compatibility with JEDEC MO-137 standards for the wide SOIC footprint. Confirm RoHS compliance status and lead finish details directly from the manufacturer's documentation prior to procurement.

Selection Notes

Select this component when designing systems requiring bidirectional data transfer or buffering between 3.3V logic domains and 5V peripherals. The 5V tolerance eliminates the need for external level shifters. Consider the 6.5ns propagation delay for timing-critical applications and verify that the ±24mA drive capability meets the load requirements of the destination bus lines.

Part Context

This part belongs to the 74LCX series of low-voltage CMOS logic devices produced by Fairchild Semiconductor, now part of onsemi. The LCX family is optimized for 2.5V and 3.3V applications while maintaining compatibility with legacy 5V systems. The 74LCX240 variant specifically functions as an octal buffer, distinguishing it from transceivers like the 74LCX245 which offer bidirectional control.

Replacement Considerations

The ON Semiconductor 74LCX244MTC is listed as a similar part number. Verify pinout compatibility and package equivalence before substitution. Cross-reference electrical parameters such as propagation delay and output drive current to ensure functional parity.