74LCX16543MEA

Overview

The Fairchild Semiconductor 74LCX16543MEA is a low-voltage 16-bit registered transceiver manufactured using advanced CMOS technology. It contains 16 non-inverting bus transceivers organized into two groups of eight, each equipped with D-type registers to temporarily store data flowing in either direction. The device supports a supply voltage range of 2V to 3.6V and features 5V-tolerant inputs and outputs, allowing direct interfacing with 5V signal environments. It operates within an industrial temperature range of -40°C to +85°C and utilizes a 56-lead SSOP package.

Feature Summary

• Features 5V-tolerant inputs and outputs for safe interface with 5V logic systems while operating at lower voltages.
• Incorporates D-type registers on both sides to latch and store data during bidirectional transmission.
• Includes independent control inputs for each byte pair, enabling flexible half-byte or full-byte data management.
• Designed with patent-pending noise/EMI reduction circuits to maintain signal integrity during high-speed operation.

Applications

• Low-voltage memory mapping applications requiring level shifting between 3.3V/2.5V and 5V domains.
• Bidirectional data bus buffering in portable consumer electronics and battery-powered devices.
• High-density data acquisition systems utilizing registered interfaces for stable data latching.
• Industrial control systems requiring robust EMI performance and wide operating temperature ranges.

Procurement Notes

Verify component authenticity as the 74LCX16543MEA is marked as obsolete and no longer manufactured by onsemi. Confirm that replacement parts, such as the SN74LVCH16543 series from Texas Instruments or Renesas equivalents, maintain identical pinouts and electrical characteristics. Ensure the selected substitute supports the required 5V tolerance and register functionality to guarantee system compatibility without redesign.

Selection Notes

Select this component when designing systems that require bidirectional data transfer between low-voltage logic cores and 5V peripherals. The integrated registration feature makes it suitable for applications needing data hold capabilities during bus transitions. Consider the 56-SSOP package constraints for PCB layout. Verify that the supply voltage remains within the 2V to 3.6V range to ensure proper operation of the CMOS technology and output drive strengths.

Part Context

The 74LCX16543 belongs to the LCX family of low-voltage CMOS logic devices, designed for high-speed operation with low power consumption. This specific model addresses the need for registered bus transceivers in mixed-voltage environments. It serves as a bridge between modern low-voltage processors and legacy 5V I/O standards, providing essential data storage and direction control functions in compact surface-mount packages.

Replacement Considerations

Public confirmed substitutes include the SN74LVCH16543ADGGR and SN74LVCH16543ADLR from Texas Instruments, as well as the 74LVCH16543APAG from Renesas Electronics Corporation. These alternatives offer similar 16-bit registered transceiver functionality with 5V tolerance. Verify package compatibility and electrical specifications before implementation.