SN74LVTH16500DLR

Overview

The SN74LVTH16500DLR is an 18-bit universal bus transceiver from the Widebus family, designed for low-voltage 3.3-V VCC operation with TTL interface capability to 5-V systems. It supports unregulated battery operation down to 2.7 V and features active bus-hold circuitry on data inputs. The device includes Ioff and power-up 3-state support for hot insertion applications. It operates within a temperature range of -40°C to 85°C and utilizes a 56-pin SSOP (DL) package.

Feature Summary

• Supports mixed-mode signal operation by providing a TTL interface to 5-V system environments while operating at 3.3 V.
• Features active bus-hold circuitry on data inputs to maintain valid logic states without external pullup or pulldown resistors.
• Includes Ioff and power-up 3-state circuitry to prevent damaging current backflow and driver conflicts during hot insertion.
• Offers distributed VCC and GND pins to minimize high-speed switching noise.

Applications

• Mixed-mode signal environments requiring 3.3-V to 5-V translation
• Hot-insertion applications utilizing Ioff and power-up 3-state support
• Unregulated battery-powered systems operating down to 2.7 V

Procurement Notes

Verify that the specific orderable part number matches the required package type, as the DL suffix denotes the SSOP package. Confirm the manufacturing status and lifecycle stage before finalizing procurement plans. Ensure compatibility with the specified voltage ranges and temperature ratings for the target application environment.

Selection Notes

Select this component when an 18-bit widebus transceiver is needed for mixed-mode 3.3-V and 5-V systems. It is suitable for designs requiring hot-insertion capabilities via Ioff and power-up 3-state features. Consider the 56-pin SSOP package constraints and verify that the flow-through architecture aligns with PCB layout requirements.

Part Context

This device belongs to Texas Instruments' Widebus family, which combines D-type latches and flip-flops for transparent, latched, or clocked operation. The LVTH series is optimized for low-voltage applications while maintaining compatibility with standard TTL interfaces, making it versatile for various digital logic interfacing tasks.

Replacement Considerations

SN74LVTH16500DGGR

FAQ

How does the device handle unused or undriven inputs?

Active bus-hold circuitry holds unused or undriven inputs at a valid logic state, eliminating the need for external pullup or pulldown resistors.

What is the function of the Ioff circuitry in this device?

The Ioff circuitry disables the outputs when VCC is between 0 and 1.5 V, preventing damaging current backflow through the device during power-down or hot-insertion scenarios.