SN74VMEH22501ZQLR

Overview

The SN74VMEH22501ZQLR is an 8-bit universal bus transceiver and two 1-bit bus transceivers with split LVTTL ports, feedback paths, and 3-state outputs. It operates at a supply voltage of 3.15 V to 3.45 V and supports a maximum clock frequency of 120 MHz. The device features B-port outputs with -48 mA/64 mA drive capability and Y/A-port outputs with -12 mA/12 mA drive. Propagation delays range from 4.5 ns to 14.5 ns depending on the port configuration. It includes Ioff, power-up 3-state, and BIAS VCC support for live insertion.

Feature Summary

• Combines D-type latches and flip-flops for transparent, latched, or clocked data transfer modes
• Provides a feedback path via separate LVTTL inputs and outputs for control and diagnostics monitoring
• Supports live insertion through Ioff, power-up 3-state, and BIAS VCC circuitry
• Features OEC circuitry to improve signal integrity and reduce electromagnetic interference

Applications

• High-speed interface between cards operating at LVTTL logic levels and VME64 backplane topologies
• Implementation of VME64x and 2eSST protocols in distributed-load backplanes
• Replacement for standard transceivers, buffers, latches, and registered transceivers in complex logic designs

Procurement Notes

Verify that the ZQLR suffix corresponds to the MicroStar BGA package as specified in the ordering information. Confirm the device meets the required temperature range of 0°C to 85°C. Ensure compatibility with 5-V tolerant inputs and 3.3-V operation. Check for RoHS compliance status before finalizing procurement specifications.

Selection Notes

Select this component when a single device must replace multiple logic functions such as transceivers, buffers, and flip-flops. It is suitable for applications requiring high drive strength on the B-port and feedback capabilities for diagnostics. Consider the BGA package constraints and thermal requirements during PCB layout. Verify that the system utilizes VME64 or compatible backplane architectures.

Part Context

This device belongs to the Texas Instruments Widebus family, designed for high-performance bus applications. It integrates universal bus transceiver functionality with specialized features for VME standards. The part number indicates a specific package variant within the broader SN74VMEH22501 series, which also includes TSSOP and TVSOP options.

Replacement Considerations

Public confirmed substitute part numbers include SN74VMEH22501DGGR and SN74VMEH22501DGVR. These alternatives share identical electrical characteristics but differ in package type. Verify pinout compatibility and thermal performance when substituting.