74AUC1G125DCKRE4

Overview

The SN74AUC1G125 is a single bus buffer gate with a 3-state output, part of the AUC logic family optimized for high-speed operation. It operates within a wide voltage range of 0.8 V to 2.7 V and features over-voltage tolerant I/Os supporting up to 3.6 V independent of VCC. The device provides ±8-mA output drive at 1.8 V and achieves a maximum propagation delay of 2.5 ns at 1.8 V with a 30 pF load. It includes an Ioff feature for partial power-down mode and back-drive protection, ensuring low power consumption with a maximum ICC of 10 µA.

Feature Summary

• Optimized for high-speed performance in sub-1-V little logic applications
• Includes Ioff circuitry to support partial power-down and prevent back-drive current
• Features ULTTL outputs designed for signal integrity on controlled impedance transmission lines

Applications

• Redriving digital signals
• Enabling or disabling digital signals
• Driving transmission lines with logic

Procurement Notes

Verify the specific package suffix (DCK, DBV, or YZP) matches the required footprint, as the base number covers multiple options. Confirm the 'RE4' suffix indicates the standard tape-and-reel packaging format. Ensure the operating temperature range aligns with system requirements, as this variant supports -40°C to +85°C. Cross-reference the manufacturer's latest orderable addendum for current production status and material compliance details before finalizing procurement.

Selection Notes

Select this component when designing systems requiring high-speed buffering between 0.8 V and 2.7 V domains. It is suitable for applications needing over-voltage tolerant inputs without external level shifting. Consider the specific package size constraints, as the DCK, DBV, and YZP options offer different physical footprints. Ensure input transition rates meet the recommended specifications to avoid excessive power consumption or oscillation during operation.

Part Context

This device belongs to Texas Instruments' AUC (Advanced Ultra-Low Voltage CMOS) logic family, which is engineered for speed and low power. Unlike standard LVC devices, the AUC series is specifically optimized for operation between 1.65 V and 1.95 V, though it functions across a wider 0.8 V to 2.7 V range. The family utilizes unique output structures to maintain signal integrity on short transmission lines without external termination resistors.

Replacement Considerations

SN74AUC1G125DBVR

FAQ

How does the Ioff feature function?

The Ioff circuitry disables all outputs when the supply pin is held at 0 V. This prevents damaging current backflow through the device when it is powered down, regardless of the input voltages applied.

What is the purpose of the ULTTL output structure?

The ULTTL outputs are balanced drivers designed to maximize transition rates while limiting ringing and transmission line reflections. They are optimized for direct connection to 50- to 65-Ω controlled impedance transmission lines of moderate length.