SN74ALVCH162525GR

Overview

The SN74ALVCH162525GR is an 18-bit registered bus transceiver with 3-state outputs from the Texas Instruments Widebus family. It operates at supply voltages between 1.65 V and 3.6 V using EPIC submicron CMOS technology. Data flow direction is controlled by OEAB and OEBA inputs, while CLKENAB and CLKENBA inputs manage clock enabling. A-to-B data passes through a single register synchronized to CLKAB. B-to-A data utilizes either a four-stage pipeline or single register path based on the SEL input, synchronized to CLK1BA and CLK2BA. The device features active bus-hold circuitry and B-port outputs with equivalent 26-ohm series resistors.

Feature Summary

• Supports asynchronous data transfer between two 18-bit buses with independent control of data flow direction
• Provides flexible B-to-A data routing through selectable single-register or four-stage pipeline paths
• Integrates active bus-hold circuitry to maintain valid logic levels on floating or unused data inputs
• Includes internal series resistance in B-port outputs to minimize signal overshoot and undershoot

Applications

• High-density memory buffer applications requiring registered data storage
• Clock domain crossing interfaces for asynchronous data synchronization
• System interconnects utilizing wide data buses with pipelined transfer requirements

Procurement Notes

Verify the specific package variant when ordering, as the GR suffix denotes the DGGR tape-and-reel configuration. Confirm that the design accommodates the required pullup resistor on the OE pin to ensure high-impedance states during power-up sequences. Ensure all control inputs are tied to defined logic levels to prevent undefined operation.

Selection Notes

Select this component for designs requiring 18-bit width with registered output capabilities across low-voltage domains. Consider the available pipeline depth if timing constraints require multi-cycle latency for reverse data transfers. Verify that the system voltage range aligns with the specified 1.65-V to 3.6-V operating limits.

Part Context

This device belongs to the Texas Instruments ALVCH logic family, designed for low-voltage digital systems. It is part of the Widebus product line, which focuses on high-performance, wide-data-path solutions. The SN74ALVCH162525 serves as a registered interface solution, distinguishing itself from standard unregistered bus transceivers by providing internal storage elements for data synchronization.

Replacement Considerations

The SN74ALVCH162525DL is a direct functional replacement offering the same specifications in a plastic shrink small-outline package.