SN74ALVCHR16269AGR

Overview

The SN74ALVCHR16269AGR is a 12-bit to 24-bit registered bus exchanger with 3-state outputs, operating from 1.65 V to 3.6 V. It features a maximum propagation delay of 5.2 ns at 3.3 V and ±24-mA output drive capability. Outputs include equivalent 26-Ω series resistors to eliminate the need for external components. Bus hold on data inputs removes the requirement for external pullup or pulldown resistors. Latch-up performance exceeds 250 mA per JESD 17.

Feature Summary

• Registered control terminals ensure all transactions are synchronous with the clock input.
• Active bus-hold circuitry maintains valid logic states on unused or undriven inputs.
• Internal series resistors reduce overshoot and undershoot without requiring external components.

Applications

• Interface between synchronous DRAMs and high-speed microprocessors
• Multiplexing two ports onto a single port
• Demultiplexing a single port to two ports

Procurement Notes

Verify the package marking matches ALVCHR16269A for the DGG TSSOP variant. Confirm RoHS compliance status via the manufacturer's current documentation. Ensure design safeguards account for OE routing through a register, which prevents determining active output states prior to the first clock pulse.

Selection Notes

Select this component when multiplexing or demultiplexing sequential 12-bit words into a 24-bit word format. The registered SEL line allows selection of specific B-port data for A outputs. Control terminals being registered ensures synchronous operation across all transactions.

Part Context

This device belongs to the Texas Instruments Widebus family. It is designed specifically for applications requiring the management of wide data buses where multiple ports must share a common interface path efficiently.

Replacement Considerations

SN74ALVCHR16269AL

FAQ

How does the device handle unused inputs?

Active bus-hold circuitry holds unused or undriven inputs at a valid logic state, eliminating the need for external pullup or pulldown resistors.

What is the function of the internal series resistors?

All outputs have equivalent 26-Ω series resistors integrated to reduce overshoot and undershoot, removing the requirement for external resistors.