74LVC543ABQ,118

Overview

The NXP USA Inc. 74LVC543ABQ,118 is an octal D-type registered transceiver with 3-state outputs housed in a DHVQFN24 package. It operates on a supply voltage range of 1.2 V to 3.6 V and supports bidirectional data flow between two sets of eight pins. The device features separate latch enable and output enable inputs for independent control of data direction. It provides high-impedance states when VCC is 0 V and includes ESD protection exceeding 2000 V (HBM) and 200 V (MM). Operating temperatures are specified from -40 °C to +85 °C or up to +125 °C.

Feature Summary

• Octal D-type registered transceiver with back-to-back registers for temporary storage
• Separate controls for data flow direction and 3-state non-inverting outputs
• High-impedance state maintained when VCC equals 0 V
• ESD protection compliant with HBM and MM standards

Applications

• Bus-oriented applications requiring bidirectional data transfer
• Temporary storage of data flow in either direction
• Interfacing with 5 V logic using 5 V tolerant inputs/outputs

Procurement Notes

Verify the specific suffix ABQ corresponds to the DHVQFN24 package configuration before procurement. Confirm that the temperature grade matches the required operational environment, as specifications vary between -40 °C to +85 °C and -40 °C to +125 °C ranges. Ensure compatibility with the target system's voltage levels and signal integrity requirements.

Selection Notes

Select this component for designs requiring isolated bidirectional data buffering with latching capabilities. The DHVQFN24 package offers a compact footprint suitable for space-constrained layouts. Consider the propagation delay characteristics relative to the system clock speed and ensure adequate thermal management if operating at higher ambient temperatures within the extended range.

Part Context

This part belongs to the 74LVC543A family of octal registered transceivers. It is manufactured by NXP Semiconductors (formerly Philips Semiconductors). The device is designed to interface low-voltage CMOS logic with other systems while providing isolation and data storage functions through its dual latch structure.

Replacement Considerations

Check for pin-compatible alternatives such as the 74LVC543AD (SO24), 74LVC543ADB (SSOP24), or 74LVC543APW (TSSOP24) if package changes are acceptable. Verify electrical parameters match the original design requirements when substituting.

FAQ

How does the 74LVC543ABQ handle power-off conditions?

The device maintains a high-impedance state on its outputs when VCC is 0 V, preventing interference with other devices on the bus during power-down.

What is the function of the separate enable inputs?

Separate latch enable (LEXX) and output enable (OEXX) inputs allow independent control over data latching and output driving for each direction (A to B and B to A).