SN74ALVCH162268DL

Overview

The SN74ALVCH162268DL is a 12-bit to 24-bit registered bus exchanger with 3-state outputs, designed for 1.65-V to 3.6-V VCC operation. It facilitates synchronous data exchange between narrow high-speed buses and wide lower-frequency buses. The device features internal registers that store data on the low-to-high transition of the clock input when appropriate clock-enable inputs are low. A select line synchronously chooses 1B or 2B input data for the A outputs. Data flow is controlled by active-low output enables (OEA, OEB), which are registered for synchronous direction changes.

Feature Summary

• Provides synchronous data exchange between two ports using internal storage registers triggered by clock transitions.
• Features B-port outputs with equivalent series resistors to reduce overshoot and undershoot without external components.
• Includes active bus-hold circuitry on data inputs to maintain valid logic states without requiring external pullup or pulldown resistors.

Applications

• Transferring data from narrow high-speed buses to wide lower-frequency buses
• Synchronous data exchange applications requiring pipeline capabilities
• Systems needing registered bus direction control

Procurement Notes

Verify the specific package type and ordering suffix against the manufacturer's current documentation before procurement. Confirm RoHS compliance status and moisture sensitivity level ratings relevant to your assembly process. Ensure that the selected component matches the required operating temperature range and voltage specifications for your design environment.

Selection Notes

Select this component when designing systems that require converting between 12-bit and 24-bit data widths with synchronous registration. Consider the integrated series resistors on B-port outputs if minimizing external components is a priority. Evaluate the need for active bus-hold functionality to simplify input conditioning in your circuit design.

Part Context

This device belongs to the Texas Instruments Widebus family of logic products. It is part of the 74ALVCH series, which offers advanced low-voltage CMOS technology. The DL package designation indicates a 56-pin SSOP form factor suitable for surface-mount applications.

Replacement Considerations

SN74ALVCH162268GR is an alternative version available in a TSSOP package.

FAQ

How does the device handle data transfer from A to B?

For A-to-B transfer, a two-stage pipeline is provided in the A-to-1B path, while a single storage register exists in the A-to-2B path. Proper control allows two sequential 12-bit words to be presented synchronously as a 24-bit word on the B port.

What is the function of the SEL input?

The select (SEL) line is synchronous with CLK and selects either 1B or 2B input data for the A outputs during B-to-A storage operations.