SN74ALVCH162268GR

Overview

The SN74ALVCH162268GR 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 two ports, transferring data from a narrow high-speed bus to a wide lower-frequency bus. Data is stored in internal registers on the low-to-high transition of the clock input when appropriate clock-enable inputs are low. The device supports A-to-B and B-to-A data flow control via active-low output enables.

Feature Summary

• Provides synchronous data exchange between two ports using internal registers triggered by clock transitions.
• Features active bus-hold circuitry on data inputs to maintain valid logic states without external pullup or pulldown resistors.
• Includes equivalent series resistors at B-port outputs to reduce overshoot and undershoot.
• Supports latch-up performance exceeding specified limits per industry standards.

Applications

• Transferring data from a narrow high-speed bus to a wide, lower-frequency bus
• Synchronous data exchange applications requiring registered bus exchangers
• Systems utilizing 1.65-V to 3.6-V power supply operations

Procurement Notes

Verify the specific ordering suffix 'GR' corresponds to the TSSOP (DGG) package with 56 pins and tape-and-reel packaging. Confirm that the part status is listed as Active production. Ensure compatibility with -40°C to 85°C operating temperature range requirements. Check for RoHS compliance and lead finish specifications if required by assembly processes.

Selection Notes

Select this component when a registered bus exchanger is needed to bridge different bus widths and frequencies. It is suitable for designs requiring synchronous data transfer with pipeline capabilities. Consider the 56-pin TSSOP package constraints and the 1.65-V to 3.6-V voltage range. Verify that the 3-state outputs and bus-hold features meet the system's interface requirements.

Part Context

This device belongs to the Texas Instruments Widebus family of logic ICs. It is part of the 74ALVCH series, which offers high-speed performance with low power consumption. The SN74ALVCH162268GR is specifically engineered for complex bus architectures requiring data buffering and direction control.

Replacement Considerations

SN74ALVCH162268DL is an alternative in the SSOP package. SN74ALVCH162268KR is available in a VFBGA package. Verify pinout and thermal characteristics when substituting packages within the same functional family.

FAQ

How does the device handle unused or undriven 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 SEL line?

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

Are external resistors required at the B-port outputs?

No, the B-port outputs include equivalent 26-Ω series resistors to reduce overshoot and undershoot, so no external resistors are required.