74AVCAH164245GRE4

Overview

The SN74AVCAH164245 is a 16-bit dual-supply bus transceiver with configurable voltage translation and 3-state outputs. It supports VCCA and VCCB supply voltages ranging from 1.4 V to 3.6 V, enabling universal bidirectional translation between 1.5-V, 1.8-V, 2.5-V, and 3.3-V nodes. The device features DOC circuitry for dynamic output impedance adjustment, active bus-hold inputs, and Ioff support for partial-power-down mode. Control pins are referenced to VCCA. Operating temperature range is -40°C to 85°C.

Feature Summary

• DOC circuitry dynamically adjusts output impedance to reduce noise without speed degradation
• Active bus-hold circuitry maintains valid logic levels on floating data inputs
• Ioff circuitry prevents damaging backflow current during partial-power-down operations
• Overvoltage-tolerant inputs and outputs facilitate mixed-voltage-mode communications

Applications

• Asynchronous communication between data buses
• Universal low-voltage bidirectional translation between different voltage nodes
• Partial-power-down applications requiring high-impedance isolation

Procurement Notes

Verify the specific package variant (TSSOP DGG, TVSOP DGV, or VFBGA GQL) against the required board layout. Confirm that the ordering suffix matches the desired tape-and-reel quantity and lead finish specifications. Ensure design compatibility with the recommended operating conditions for both VCCA and VCCB rails.

Selection Notes

Select this component when designing systems requiring flexible voltage translation across multiple standard logic levels. The dual-supply architecture allows independent configuration of A and B ports. Consider the DOC feature for signal integrity in high-speed asynchronous transfers where noise reduction is critical.

Part Context

This device belongs to the Texas Instruments Widebus family of logic ICs. It is designed specifically for noninverting data transmission between buses operating at different voltage potentials. The architecture supports two separate octal sections within a single package.

Replacement Considerations

SN74AVCB164245GRE4

FAQ

How does the DOC circuitry function?

The DOC circuitry initially lowers output impedance to drive loads effectively and subsequently raises impedance to reduce noise, maintaining performance without speed degradation.

What is the purpose of the Ioff feature?

The Ioff feature disables outputs to prevent damaging current backflow through the device when it is powered down, supporting partial-power-down mode operation.