SN74ALVCH16269KR

Universal Bus Functions Overview

The SN74ALVCH16269KR is a 12-bit to 24-bit registered bus exchanger with 3-state outputs, manufactured by Texas Instruments. It operates from a supply voltage range of 1.65 V to 3.6 V and features a maximum propagation delay of 5 ns at 3.3 V. The device provides ±24-mA output drive capability at 3.3 V and includes bus hold on data inputs to eliminate the need for external pullup or pulldown resistors. It is housed in a 56-pin VFBGA (GQL) package.

Universal Bus Functions Feature Summary

• Registered bus exchanger architecture designed for multiplexing two separate ports onto a single port or demultiplexing from a single port.
• Active bus-hold circuitry maintains unused or undriven inputs at valid logic states without requiring external resistors.
• Control terminals are registered to ensure all transactions remain synchronous with the clock input.

Universal Bus Functions Applications

• Interface between synchronous DRAMs and high-speed microprocessors
• Multiplexing two 12-bit words into a 24-bit word on the B port
• Demultiplexing a 24-bit word back into two sequential 12-bit words

Universal Bus Functions Procurement Notes

Verify the specific GQL package variant against the datasheet pinout diagram. Confirm that the application design accounts for the registered control terminals, as OE active states cannot be determined before the first clock pulse arrives during power-up sequences.

Universal Bus Functions Selection Notes

Select this component when a registered interface is required to bridge synchronous memory and processor buses. Ensure the system supports the 1.65-V to 3.6-V operating range and utilizes the 56-pin VFBGA footprint. Consider the registered nature of control signals when designing the clock distribution network.

Universal Bus Functions Part Context

This device belongs to the Texas Instruments Widebus family, which specializes in wide-data-path logic solutions. The SN74ALVCH16269KR specifically addresses bandwidth requirements by combining two 12-bit channels into a consolidated 24-bit interface while maintaining synchronization through internal registers.

Universal Bus Functions Replacement Considerations

No public confirmed substitute part numbers are available in the provided documentation.

Universal Bus Functions FAQ

How does the device handle unused inputs?

The device incorporates active bus-hold circuitry on the data inputs, which holds unused or undriven inputs at a valid logic state, eliminating the need for external pullup or pulldown resistors.

What determines the active state of the outputs during power-up?

Because the output enables (OE) are routed through a register, their active state cannot be determined before the arrival of the first clock pulse. A clock pulse should be applied as soon as possible after power-up to establish the state.