74ABT646AD,112

Buffers, Drivers, Receivers, Transceivers Overview

The NXP 74ABT646AD,112 is an octal bus transceiver and register featuring 3-state outputs. It integrates D-type flip-flops with control circuitry for multiplexed data transmission from input buses or internal registers. The device supports real-time transfer and stored data modes via Select pins. It operates within a supply voltage range of 4.5 V to 5.5 V. Maximum frequency reaches 350 MHz at 5.0 V. Propagation delays are typically 3.9 ns (clock-to-output) and 3.2 ns (bus-to-bus). Output drive capability is +64 mA low and -32 mA high.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Combines 74ABT245 transceiver and 74ABT373A register functions in a single device
• Features independent registers for A and B buses allowing multiplexed real-time and stored data handling
• Supports live insertion and extraction operations
• Includes power-up 3-state and power-up reset functionality

Buffers, Drivers, Receivers, Transceivers Applications

• Multiplexed data transmission between buses
• Storage and retrieval of bus data via internal registers
• High-speed bidirectional data communication interfaces

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix '112' against current NXP documentation to confirm package type and tape/reel specifications. Confirm RoHS compliance status as indicated in the latest datasheet revision. Ensure the SO24 plastic small outline package (SOT137-1) matches the target PCB footprint requirements. Check for any recent product change notices that may affect pinout or electrical characteristics.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when both bus transceiving and data storage capabilities are required on a single channel pair. The ABT series offers BiCMOS performance suitable for high-speed applications. Verify that the 4.5 V to 5.5 V operating voltage aligns with the system power rails. Consider the 3-state output isolation features for managing bus contention during live insertion scenarios.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the 74ABT logic family, which utilizes BiCMOS technology for high speed and low power dissipation. The 74ABT646A variant specifically merges the functionalities of standard octal transceivers and latches. It is designed for applications requiring flexible bus management with simultaneous real-time and registered data paths.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

The 74ABT646ADB (SSOP24) and 74ABT646APW (TSSOP24) offer identical electrical specifications with different package footprints. Cross-referencing with other manufacturers requires verifying pin compatibility and ensuring equivalent propagation delay and drive current ratings.