SN74VMEH22501GQLR

Overview

The SN74VMEH22501GQLR 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. The B-port outputs provide -48 mA/64 mA drive, while Y and A-port outputs provide -12 mA/12 mA drive. The device supports live insertion via Ioff, power-up 3-state, and BIAS VCC features. It includes active bus-hold on 3A-port data inputs and a 26-Ω equivalent series resistor on 3A ports and Y outputs.

Feature Summary

• UBT transceiver combines D-type latches and flip-flops for transparent, latched, or clocked modes
• Split LVTTL port provides a feedback path for control and diagnostics monitoring
• OEC circuitry improves signal integrity and reduces electromagnetic interference
• Supports live insertion through Ioff, power-up 3-state, and BIAS VCC

Applications

• High-speed interface between cards operating at LVTTL logic levels and VME64 backplane topologies
• VME64x backplane applications supporting 2eVME protocols
• VME systems supporting 2eSST protocols

Procurement Notes

Verify the GQLR suffix corresponds to the VFBGA package and tape-and-reel delivery format. Confirm the component meets RoHS compliance standards as specified in the datasheet. Ensure the ordering part number matches the exact manufacturer designation to avoid compatibility issues with existing designs.

Selection Notes

Select this component when a high-drive universal bus transceiver with integrated latch and flip-flop functionality is required. It is suitable for replacing multiple standard logic functions such as buffers, latches, and registered transceivers in a single package. Consider its 5-V tolerant inputs and split port architecture for complex diagnostic and control requirements.

Part Context

This device belongs to the Texas Instruments Widebus family of universal bus transceivers. It is designed specifically for high-performance backplane applications, offering optimized drive capabilities and noise immunity. The GQLR variant utilizes a VFBGA MicroStar Junior package, providing a compact solution for dense PCB layouts.

Replacement Considerations

SN74VMEH22501DGGR

FAQ

What are the available data transfer modes for the UBT transceiver?

The UBT transceiver allows operation in transparent, latched, or clocked (flip-flop) modes of data transfer.

How does the device support live insertion?

It supports live insertion using Ioff circuitry to prevent backflow current, power-up 3-state to prevent driver conflict, and BIAS VCC to precondition connections during card insertion or removal.