SN74LVTH18511DGGR

Overview

The SN74LVTH18511DGGR is a 3.3-V ABT 18-bit universal bus transceiver with boundary scan, housed in a TSSOP-64 package. It supports mixed-mode signal operation with 5-V input and output voltages while operating at 3.3 V VCC. The device features active bus-hold circuitry on data inputs to eliminate external pullup/pulldown resistors. It operates from an unregulated battery supply down to 2.7 V and includes a 4-wire test access port (TAP) interface compliant with IEEE Std 1149.1-1990 for board-level testing.

Feature Summary

• Combines D-type latches and flip-flops for transparent, latched, or clocked data flow modes
• Integrates a 4-wire TAP interface for IEEE Std 1149.1-1990 boundary scan testing
• Supports mixed-mode signal operation between 3.3-V and 5-V systems
• Features active bus-hold circuitry to maintain valid logic states on unused inputs

Applications

• Complex circuit-board assembly testing via JTAG interfaces
• Mixed-mode signal interfacing between 3.3-V and 5-V system environments
• Universal bus transceiver applications requiring transparent, latched, or clocked data modes
• Unregulated battery-powered system designs

Procurement Notes

Verify the specific ordering suffix DGGR corresponds to the TSSOP-64 tape and reel packaging configuration. Confirm that the component meets RoHS standards as indicated by the RG4 designation. Ensure compatibility with the required 3.3-V ABT technology family and verify the operational temperature range aligns with your design specifications before finalizing procurement.

Selection Notes

Select this component when an 18-bit universal bus transceiver with integrated boundary scan capabilities is required. It is suitable for designs needing mixed-mode voltage translation between 3.3-V and 5-V domains. The inclusion of active bus-hold circuitry simplifies input handling for undriven lines. Consider the TSSOP-64 package constraints and the necessity for a 4-wire TAP interface for compliance with standard board-level testing protocols.

Part Context

This device belongs to Texas Instruments' Widebus Family and utilizes state-of-the-art 3.3-V ABT BiCMOS technology. It functions as a universal bus transceiver (UBT) capable of operating as two 9-bit transceivers or one 18-bit transceiver. The integration of boundary scan architecture allows for direct observation and control of I/O boundaries without affecting normal functional operation during standard testing procedures.

Replacement Considerations

Verify pinout and electrical characteristics against potential substitutes. Check if alternative components support the same IEEE Std 1149.1-1990 instruction set and register configurations. Ensure the replacement maintains the 3.3-V ABT technology and 5-V tolerant I/O capabilities required for mixed-mode operation.