74GTLPH16912VRE4

Overview

The SN74GTLPH16912VRE4 is an 18-bit Universal Bus Transceiver (UBT) from the Widebus family, providing LVTTL-to-GTLP and GTLP-to-LVTTL signal-level translation. It operates with a supply voltage range of 3.15 V to 3.45 V and supports clock frequencies up to 175 MHz. The device features medium-drive outputs capable of 50 mA on the B port and ±24 mA on the A port. Propagation delays are typically 6.5 ns for A-to-B transitions and 5.8 ns for B-to-A transitions. It includes TI-OPC circuitry to limit ringing and OEC circuitry to improve signal integrity.

Feature Summary

• Combines D-type latches and flip-flops for transparent, latched, clocked, and clock-enabled data transfer modes
• Supports live insertion through Ioff, power-up 3-state, and BIAS VCC circuitry
• Features active bus-hold on A-port inputs to maintain valid logic states without external resistors
• Includes TI-OPC circuitry to minimize overshoot and bus-settling time on unevenly loaded backplanes

Applications

• High-speed interface between cards operating at LVTTL levels and backplanes operating at GTLP levels
• Replacement for various standard UBT functions including transceivers, buffers, latches, and registered transceivers
• Distributed load backplane applications requiring optimal data-transfer rates and signal integrity

Procurement Notes

Verify the specific ordering suffix 'VRE4' against the latest Texas Instruments Package Option Addendum to confirm current production status and environmental compliance details. Ensure the TVSOP-56 package drawing matches the design requirements. Confirm that the manufacturer's official documentation lists this part as active or recommended for new designs before finalizing procurement plans.

Selection Notes

Select this component when an 18-bit bidirectional interface is required between LVTTL and GTLP domains. It is suitable for designs needing flexible data-path control via clock enables and latch enables. Consider its medium-drive capability for heavily loaded backplanes with low equivalent load impedance. Verify compatibility with existing system timing constraints regarding setup and hold times.

Part Context

This device belongs to the Texas Instruments Widebus family of logic ICs. It serves as a versatile replacement for multiple standard logic functions, including the '245, '645, '373, and '374 series in 18-bit configurations. The SN74GTLPH16912 integrates universal bus transceiver capabilities into a single package, simplifying board layout for high-density systems.

Replacement Considerations

Public confirmed substitute part numbers include SN74GTLPH16912GR and SN74GTLPH16912VR. These variants share identical functional specifications but differ in package type (TSSOP vs. TVSOP). Verify pinout compatibility and thermal characteristics when substituting.