74LCX646WMX

Overview

The 74LCX646WMX is a low voltage octal bus transceiver and register fabricated with advanced CMOS technology. It operates within a 2.3V to 3.6V supply range and features 5V tolerant inputs and outputs, enabling direct interfacing with 5V signal environments. The device includes D-type flip-flops for data storage and control circuitry for multiplexed transmission from input buses or internal registers. Packaged in a 24-pin SOP format, it supports surface-mount assembly.

Feature Summary

• Provides bidirectional data transfer between two 8-bit buses with optional latching capability via integrated D-type flip-flops.
• Features 5V tolerant I/O structures allowing safe operation when interfacing low-voltage logic with 5V systems.
• Incorporates dedicated Output Enable pins to independently control data flow direction and buffer state.

Applications

• Mobile communication equipment requiring low power consumption
• Battery-powered consumer electronics
• Portable computing devices

Procurement Notes

Verify the manufacturer origin as Fairchild Semiconductor or its successor onsemi, noting that production status may vary due to corporate acquisitions. Confirm the suffix 'WMX' corresponds to the specific 24-SOP tape-and-reel packaging configuration required for automated assembly processes. Ensure compliance with current RoHS directives by checking the specific lot documentation against historical non-compliant batches.

Selection Notes

Select this component when an octal transceiver with latching functionality is required for low-voltage applications. It is suitable for designs needing 5V tolerance on both input and output lines while operating at 3.3V. Consider the 24-SOP package constraints regarding board space and thermal dissipation compared to TSSOP alternatives.

Part Context

This part belongs to the 74LCX series of low-voltage CMOS logic devices. The LCX family is designed to replace older LVC and LVX technologies, offering improved speed and lower power consumption. The 74LCX646 specifically addresses the need for registered bus interfaces in portable systems where voltage translation and data retention are critical.

Replacement Considerations

Check for equivalents such as the 74LCX646DW or other variants within the same LCX family that share identical electrical characteristics but differ in package type or reel specifications.