SN74GTLPH16612DLR

Overview

The SN74GTLPH16612DLR is an 18-bit Universal Bus Transceiver (UBT) from Texas Instruments, designed for LVTTL-to-GTLP and GTLP-to-LVTTL signal-level translation. It integrates D-type latches and flip-flops to support transparent, latched, clocked, or clock-enabled data transfer modes. The device operates with a 3.3 V supply for LVTTL buffers and a 5 V supply for internal/GTLP circuitry. Key electrical parameters include a maximum clock frequency of 85 MHz, propagation delays ranging from 1.5 ns to 7.8 ns depending on the path, and output drive currents of -32 mA/64 mA for A-port and 34 mA for B-port. It features OEC circuitry for optimized rise/fall times in distributed loads.

Feature Summary

• Combines D-type latches and flip-flops to enable transparent, latched, clocked, or clock-enabled operation modes.
• Provides bidirectional interface between 5-V tolerant LVTTL logic levels and GTLP signal levels.
• Incorporates Output Edge Control (OEC) circuitry to improve signal integrity and reduce electromagnetic interference.
• Supports partial-power-down mode via Ioff circuitry to prevent damaging current backflow.

Applications

• High-speed interface between cards operating at LVTTL logic levels and backplanes operating at GTLP signal levels.
• Replacement for standard transceivers, buffers, latches, and registered transceivers in 18-bit configurations.
• Distributed load backplane applications requiring optimized transition times for signal integrity.

Procurement Notes

Verify the package type matches the design requirements; the 'DLR' suffix indicates an SSOP-56 tape and reel packaging format. Confirm that the system design accommodates the dual-supply voltage architecture, specifically the 3.3 V for LVTTL outputs and 5 V for GTLP circuitry. Ensure control inputs are properly biased to VCC or GND to maintain stable operation across the specified temperature range.

Selection Notes

Select this component when an 18-bit universal bus transceiver is required for mixed-voltage interfaces between LVTTL and GTLP domains. It is suitable for designs needing flexible data flow control through multiple operational modes including transparent and clocked storage. Consider the medium-drive output capabilities and OEC features if signal integrity on distributed backplane loads is a primary design constraint.

Part Context

This device belongs to Texas Instruments’ Widebus Family and utilizes UBT technology. It serves as a comprehensive replacement for various discrete logic functions such as ’245, ’645, ’16245, ’16863, and ’16474 in 18-bit implementations. The SN74GTLPH16612 consolidates these functionalities into a single integrated circuit to simplify board layout and reduce component count.

Replacement Considerations

Public confirmed substitute part numbers: SN74GTLPH16612DL, SN74GTLPH16612GR.