SN74VMEH22501AGQLR

Overview

The SN74VMEH22501AGQLR 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 device supports a maximum clock frequency of 120 MHz. Propagation delays range from 1.4 ns to 14.5 ns depending on the port and direction. High-level output current is -48 mA for B-ports and -12 mA for A/Y-ports; low-level output current is 64 mA for B-ports and 12 mA for A/Y-ports. Operating temperature is -40°C to 85°C.

Feature Summary

• Combines D-type latches and flip-flops for transparent, latched, or clocked data transfer modes
• Includes active bus-hold circuitry on 3A-port inputs to maintain valid logic states
• Supports live insertion via Ioff, power-up 3-state, and BIAS VCC features
• Provides separate LVTTL input and output ports for control and diagnostics monitoring

Applications

• High-speed interface between cards operating at LVTTL logic levels and VME64 backplane topologies
• Systems requiring compliance with VME64, 2eVME, and 2eSST protocols
• Multi-processor platforms for signal processing applications

Procurement Notes

Verify that the specific suffix AGQLR corresponds to the VFBGA package type as listed in the ordering information. Confirm the manufacturer is Texas Instruments and check for RoHS compliance status. Ensure the component meets the required operating temperature range of -40°C to 85°C for your application environment before finalizing procurement.

Selection Notes

Select this component when a single device must replace multiple standard logic functions such as transceivers, buffers, latches, and registered transceivers. It is suitable for designs requiring high drive capability on B-ports and feedback paths for diagnostics. Consider the VFBGA package if space constraints require a compact footprint compared to TSSOP options.

Part Context

This part belongs to the SN74VMEH22501A family within Texas Instruments' Widebus Universal Bus Transceiver (UBT) line. It is designed for 3.3-V operation with 5-V tolerant inputs. The device integrates an 8-bit UBT transceiver with two integral 1-bit three-wire bus transceivers, offering a consolidated solution for complex bus architectures.

Replacement Considerations

The SN74VMEH22501A is pin-for-pin compatible with the SN74VMEH22501 but offers a wider operating temperature range. It can functionally replace devices such as '245, '623, '645, '241, '244, '541, '543, '373, '573, '646, '652, '374, and '574.

FAQ

What is the purpose of the BIAS VCC feature?

BIAS VCC precharges and preconditions the B-port input/output connections, preventing disturbance of active data on the backplane during card insertion or removal.

How does the device support live insertion?

It supports live insertion through Ioff circuitry which prevents damaging backflow current, power-up 3-state circuitry which places outputs in a high-impedance state during power transitions, and BIAS VCC circuitry.

Can this device operate in clocked modes?

Yes, the UBT transceiver allows data storage in latches or flip-flops on the low-to-high transition of CLKAB or CLKBA when the latch-enable (LE) input is low.