74ABT646ADB,118

Buffers, Drivers, Receivers, Transceivers Overview

The 74ABT646ADB,118 is an octal bus transceiver and register manufactured by NXP USA Inc. It operates within a supply voltage range of 4.5 V to 5.5 V and supports an ambient temperature range from -40 °C to +85 °C. The device features 3-state outputs with a high-level output current capability of -32 mA and a low-level output current capability of 64 mA. It utilizes a 24-lead SSOP package (SOT340-1).

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Combines 74ABT245 and 74ABT373A type functions in one device.
• Independent registers for A and B buses allow multiplexed real-time and stored data transmission.
• Provides latch-up protection exceeding 500 mA per JESD78B class II level A.
• Supports live insertion and extraction operations.

Buffers, Drivers, Receivers, Transceivers Applications

• Bus management systems requiring simultaneous storage and transfer.
• High-performance BiCMOS logic circuits needing low power dissipation.
• Applications permitting live insertion and extraction on data buses.

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific ordering suffix

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal transceiver with integrated storage registers is required. The device supports independent A and B bus registers for flexible data handling. Ensure the application environment remains within the specified -40 °C to +85 °C temperature range and utilizes a 4.5 V to 5.5 V supply voltage. The SSOP24 package is suitable for space-constrained designs requiring surface mount technology.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the 74ABT series of high-performance BiCMOS logic devices. It integrates bus transceiver circuits with D-type flip-flops and control circuitry. The device allows data to be clocked into registers or transmitted directly from the input bus based on control signals. It is designed for applications demanding high speed and high output drive capabilities.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

The datasheet lists the 74ABT646AD and 74ABT646APW as alternative packages for the same logical function. Verify pin compatibility and thermal requirements before substitution.

Buffers, Drivers, Receivers, Transceivers FAQ

What is the maximum operating frequency?

The maximum frequency is 350 MHz at 25 °C and 125 MHz at temperatures ranging from -40 °C to +85 °C.

How does the device handle data storage during isolation mode?

In isolation mode (OE = HIGH), data from bus A may be stored in the B register and/or data from bus B may be stored in the A register.