74LCX16543MEA

Overview

The onsemi 74LCX16543MEA is a low-voltage 16-bit registered transceiver designed for 2.5V or 3.3V VCC applications with 5V tolerant inputs and outputs. It contains 16 non-inverting bus transceivers organized into two groups of eight bits each, featuring independent control inputs per byte. The device utilizes advanced CMOS technology to achieve high-speed operation while maintaining low power consumption. Key electrical parameters include a maximum propagation delay of 5.2 ns at VCC = 3.3V, a maximum quiescent current (IICC) of 20μA, and output drive capabilities of ±24 mA at VCC = 3.0V. It operates within a supply voltage range of 2.3V to 3.6V and supports hot insertion.

Feature Summary

• Features 5V tolerant inputs and outputs, enabling safe interfacing between low-voltage logic and 5V signal environments.
• Incorporates two D-type registers to temporarily store data flowing in either direction across the bus.
• Includes patented noise/EMI reduction circuits to minimize electromagnetic interference during switching operations.

Applications

• Interface solutions for low-voltage (2.5V or 3.3V) systems requiring compatibility with 5V signals
• High-speed data bus architectures utilizing registered transceivers
• Hot insertion applications supported by powered-down high-impedance states

Procurement Notes

Verify component authenticity through authorized distributors due to discontinued status. Confirm package integrity as the 56-SSOP form factor may vary slightly between manufacturing lots. Check RoHS compliance documentation to ensure adherence to environmental standards required for modern assembly processes. Validate pinout alignment against target PCB footprint specifications before integration.

Selection Notes

Select this component when designing systems that require bidirectional data transfer with latching capability between mixed-voltage domains. The 5V tolerance feature makes it suitable for legacy interface bridging. Consider the 56-SSOP package constraints regarding board space and thermal dissipation. Ensure supply voltage remains within the 2.3V to 3.6V range for optimal performance and ESD protection levels.

Part Context

Part of the 74LCX family, which focuses on low-voltage CMOS logic with high speed and low power. The 74LCX16543 specifically addresses the need for registered bus transceivers in portable and battery-operated devices. It complements other LCX series components by providing data storage functionality alongside signal translation, facilitating complex digital system designs.

Replacement Considerations

Public confirmed substitute part numbers include 74LVCH16543APAG from Renesas Electronics Corporation. Verify functional equivalence regarding voltage tolerances and register configurations before substitution.

FAQ

What is the maximum propagation delay of the 74LCX16543MEA?

The maximum propagation delay is 5.2 ns when operating at a supply voltage of 3.3V.

Does the device support hot insertion?

Yes, the device supports hot insertion due to its powered-down high-impedance input and output characteristics.