74LCX543WM

Overview

The onsemi 74LCX543WM is a low voltage octal registered transceiver featuring 5V tolerant inputs and outputs. It operates within a supply voltage range of 2.0V to 3.6V, with typical applications at 2.5V or 3.3V. The device provides a maximum propagation delay of 7.0 ns at VCC = 3.3V and supports ±24 mA output drive current at VCC = 3.0V. It utilizes advanced CMOS technology for high-speed operation while maintaining low power dissipation, with a maximum quiescent supply current of 10 µA.

Feature Summary

• Features 5V tolerant inputs and outputs for interfacing between low voltage logic and 5V signal environments.
• Contains two sets of D-type registers allowing independent input and output control for data flow in either direction.
• Implements patented noise and EMI reduction circuitry to enhance signal integrity during switching operations.

Applications

• High-density memory modules requiring bidirectional data buffering
• Clock drivers and buffer circuits in low voltage systems
• Multi-drop buses connecting microprocessors to peripheral devices

Procurement Notes

Verify the specific package marking and manufacturer origin, as this component was originally produced by Fairchild Semiconductor before acquisition by onsemi. Confirm that the ordering code suffix 'WM' corresponds to the 24-lead SOIC package (M24B) required for your PCB footprint. Ensure compatibility with existing design files regarding pinout and thermal characteristics.

Selection Notes

Select this component when designing systems that require bidirectional data transfer between 2.5V/3.3V logic domains and 5V tolerant interfaces. It is suitable for applications demanding low power consumption alongside moderate speed performance. Consider the separate latch enable and output enable controls if independent management of data storage and transmission states is necessary for the system architecture.

Part Context

This device belongs to the LCX family of low voltage CMOS logic products. It serves as an octal registered transceiver, distinct from non-registered variants like the 74LCX245. The WM suffix specifically denotes the 24-lead Small Outline Integrated Circuit (SOIC) package format, distinguishing it from SSOP or TSSOP versions available within the same logical product line.

Replacement Considerations

Direct replacements include the 74LCX543MSA (SSOP package) and 74LCX543MTC (TSSOP package) which share identical electrical specifications but differ in physical footprint. Other manufacturers may offer equivalent parts such as the SN74LVC543APWR, though voltage ranges and timing characteristics should be verified against the datasheet requirements.