SN74ALVCH162268DLR

Overview

The SN74ALVCH162268DLR is a registered bus exchanger from the Texas Instruments Widebus family, designed for synchronous data exchange between narrow high-speed buses and wide lower-frequency buses. It operates on a single 1.65-V to 3.6-V supply with a maximum propagation delay of 4.8 ns at 3.3 V. The device provides ±24-mA output drive at 3.3 V and features active bus-hold circuitry on data inputs. B-port outputs include equivalent 26-Ω series resistors to reduce overshoot and undershoot without external components.

Feature Summary

• Synchronous data transfer capability between two ports using internal registers triggered by clock transitions
• Active bus-hold circuitry maintains valid logic states on unused or undriven inputs
• Integrated series resistance in B-port outputs eliminates the need for external resistors
• Registered control terminals ensure synchronous changes in bus direction

Applications

• Transferring data from narrow high-speed buses to wide lower-frequency buses
• Presenting two sequential 12-bit words synchronously as a 24-bit word on the B port
• Applications requiring synchronous data exchange between different bus widths

Procurement Notes

Verify the specific ordering suffix 'DLR' corresponds to the tape-and-reel packaging configuration. Confirm that the SSOP package variant matches the required footprint and pin spacing for the target PCB design. Ensure compatibility with the specified operating temperature range of -40°C to 85°C for the intended application environment.

Selection Notes

Select this component when a registered bus exchanger is needed to bridge narrow and wide bus architectures. Consider the 1.65-V to 3.6-V supply voltage range and the requirement for synchronous data handling. Evaluate the need for integrated series resistance in the B-port outputs to simplify board layout and reduce component count.

Part Context

This device belongs to the Texas Instruments Widebus family, which offers solutions for interfacing between buses of varying widths. The SN74ALVCH162268 specifically addresses scenarios where data must be exchanged synchronously between a 12-bit A port and a 24-bit B port, utilizing internal registers for data storage and control.

Replacement Considerations

SN74ALVCH162268GR is a confirmed substitute part number available in a TSSOP package.

FAQ

How does the device handle unused or undriven inputs?

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

What is the function of the SEL line?

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