SN74ALVCHR16269ALR

Overview

The SN74ALVCHR16269ALR 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. All 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

• Supports multiplexing two ports onto or demultiplexing from a single port via internal B-port registers.
• Provides synchronous control terminals where all transactions are synchronized with the clock input.
• Includes active bus-hold circuitry to maintain valid logic states on unused or undriven inputs.

Applications

• Interface between synchronous DRAMs and high-speed microprocessors
• Multiplexing two sequential 12-bit words into a 24-bit word on the B port
• Demultiplexing data from the B port to A outputs using the select line

Procurement Notes

Verify the specific package variant against the datasheet, as the AL suffix indicates an obsolete SSOP DL package while the R suffix denotes a TSSOP DGG tape and reel format. Confirm RoHS compliance status and ensure the ordering information matches the required physical footprint and pin configuration for your design.

Selection Notes

Select this component when designing systems requiring registered bus exchange between 12-bit and 24-bit widths. Ensure the supply voltage falls within the 1.65 V to 3.6 V range and that the application benefits from the integrated series resistors and bus hold features to simplify board layout.

Part Context

This device belongs to the Texas Instruments Widebus family, designed for high-density data routing applications. The SN74ALVCHR16269A series provides registered storage for both A-to-B and B-to-A data transfers, allowing flexible control over data flow direction and timing through dedicated enable and select lines.

Replacement Considerations

SN74ALVCHR16269AG

FAQ

How does the device handle unused inputs?

The device incorporates active bus-hold circuitry on its data inputs, which maintains them at a valid logic state without requiring external pullup or pulldown resistors.

What is the function of the CLKENA inputs?

The CLKENA1 and CLKENA2 inputs control the storage of data in the internal B-port registers during the low-to-high transition of the clock signal.