SN74VMEH22501ADGVR

Overview

The SN74VMEH22501ADGVR is an 8-bit universal bus transceiver with two integrated 1-bit three-wire bus transceivers, designed for 3.3-V VCC operation with 5-V tolerant inputs. It operates within a temperature range of -40°C to 85°C and features split LVTTL ports with feedback paths. The device supports transparent, latched, or clocked modes via D-type latches and flip-flops. B-port outputs provide high drive (-48 mA/64 mA), while A-port and Y-output currents are ±12 mA. Propagation delays reach up to 10.6 ns, supporting clock frequencies up to 120 MHz.

Feature Summary

• Combines D-type latches and flip-flops for transparent, latched, or clocked data transfer
• Split LVTTL port architecture provides dedicated feedback paths for control and diagnostics monitoring
• Supports live insertion through Ioff, power-up 3-state, and BIAS VCC circuitry
• Includes active bus-hold circuitry on 3A-port data inputs to maintain valid logic states

Applications

• High-speed interfaces between cards operating at LVTTL logic levels and VME64 backplane topologies
• Interfaces compatible with VME64x and VME320 backplane architectures
• Systems requiring compliance with 2eVME and 2eSST protocols

Procurement Notes

Verify the specific suffix 'DGVR' corresponds to the TVSOP-48 package when sourcing. Confirm that the component meets the required industrial temperature range of -40°C to 85°C. Ensure the design accounts for the 3.3-V supply voltage specifications and 5-V tolerant input requirements. Cross-reference the manufacturer's ordering information to validate the part number against current production data sheets.

Selection Notes

Select this component for applications requiring a unified solution for bus transceiving, latching, and flip-flop operations. It serves as a replacement for multiple standard logic functions including '245, '645, '543, and '374 series devices. The split port design is advantageous for systems needing diagnostic feedback without additional external components. Consider the high-drive B-port capabilities for driving large capacitive loads typical in backplane environments.

Part Context

This device belongs to the Texas Instruments Widebus Family, specifically the UBT (Universal Bus Transceiver) series. It is pin-for-pin compatible with the SN74VMEH22501 but offers an extended operating temperature range. The SN74VMEH22501A integrates complex functionality into a single package, reducing board space compared to using discrete transceivers and registers.

Replacement Considerations

Public confirmed substitute part numbers include SN74VMEH22501ADGGR.