SN74LVTH16500GQLR

Overview

The SN74LVTH16500GQLR is an 18-bit universal bus transceiver from the LVTH family, designed for low-voltage 3.3-V VCC operation with TTL interface capability to a 5-V system environment. It supports mixed-mode signal operation and unregulated battery operation down to 2.7 V. The device features flow-through architecture, active bus-hold circuitry on data inputs, and distributed VCC and GND pins to minimize high-speed switching noise. It includes Ioff and power-up 3-state support for hot insertion applications.

Feature Summary

• Supports mixed-mode signal operation by providing a TTL interface to a 5-V system environment while operating at 3.3 V.
• Features active bus-hold circuitry on data inputs to eliminate the need for external pullup or pulldown resistors.
• Includes Ioff and power-up 3-state circuitry to prevent damaging current backflow and driver conflicts during hot insertion.
• Utilizes a flow-through architecture to optimize printed circuit board layout.

Applications

• Mixed-mode signal environments requiring 3.3-V to 5-V translation
• Hot-insertion applications utilizing Ioff and power-up 3-state capabilities
• Unregulated battery operation systems

Procurement Notes

Verify that the ordering suffix matches the required package type and temperature range. Confirm the specific tape and reel specifications against the manufacturer's latest packaging addendum. Ensure compatibility with the target voltage levels and interface requirements before finalizing procurement.

Selection Notes

Select this component when designing systems that require 18-bit bidirectional data transfer between 3.3-V and 5-V logic domains. Consider its flow-through architecture for efficient PCB routing and its integrated bus-hold feature to simplify input handling without external components.

Part Context

This part belongs to Texas Instruments' Widebus family of UBT transceivers. These devices combine D-type latches and flip-flops for transparent, latched, or clocked operation. The LVTH series specifically targets low-voltage applications while maintaining compatibility with standard TTL interfaces.

Replacement Considerations

SN74LVTH16500DGGR (TSSOP package)

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 states.