74LCX543MTCX

Overview

The Fairchild Semiconductor 74LCX543MTCX is an octal registered bus transceiver belonging to the 74LCX logic family. It features eight independent bidirectional data paths with registered outputs, designed for low-voltage CMOS applications. The device operates within a supply voltage range of 2.0 V to 3.6 V and supports LVTTL or TTL input levels while providing LVCMOS output levels. Key electrical parameters include a maximum propagation delay of 8 ns, a low-level output current of 24 mA, and a high-level output current of -24 mA. It utilizes a 24-pin TSSOP package and functions as a non-inverting transceiver with three-state outputs.

Feature Summary

• Octal Registered Bus Transceiver
• Bidirectional Data Paths
• Three-State Outputs

Applications

• Memory mapping control
• Clock drivers
• Bus-oriented transmitter/receivers

Procurement Notes

Verify the specific manufacturer origin, as this component was originally produced by Fairchild Semiconductor and later acquired by onsemi. Confirm RoHS compliance status and check for End-of-Life (EOL) notifications or Product Change Notifications (PCN). Ensure the suffix 'X' corresponds to the required tape-and-reel packaging format for your assembly line.

Selection Notes

Select this component when designing systems requiring registered data storage at the bus interface point. It is suitable for applications needing isolation between source and destination buses with latched data integrity. Consider the 8 ns propagation delay and 24 mA drive capability against load requirements. Ensure the 2V to 3.6V operating range aligns with the system's core voltage specifications.

Part Context

This part belongs to the 74LCX series, which represents low-voltage CMOS technology optimized for 3.3V systems. The 74LCX543 variant specifically provides registered buffering capabilities, distinguishing it from unbuffered transceivers like the 74LCX245. It shares pinout compatibility with other octal bus transceivers but offers distinct registration features for timing control in digital logic circuits.

Replacement Considerations

Public confirmed substitute part numbers include 74LCX543MTC and PI74LCX543SX.