7.3 Feature Description

7.3.1 Extended 1.2V Compatibility

TMUXHS221F comes with extended 1.2V control logic not only makes it compatible with latest generation of low

nm SoCs but also allows sufficient noise margin for system designers and hence easy usage of TMUXHS221F.

The 1.2V logic is non- scalable with supply voltages which gives immense flexibility to power up TMUXHS221F

with supplies from 1.62V-5.5V and still it stands compatible to 1.2V controlled switches via GPIO/I2C compatible

SEL and OE pins.

7.3.2 Overvoltage Protection

The OVP of the TMUXHS221F is designed to protect the system from SBU or D+/- shorts to VBUS at the USB

and USB Type-C connector. Figure 7-2 depicts a moisture short that would cause high voltage of 28V to appear

on an existing USB solution that could pass through the device and damage components behind the device.

Figure 7-2. Existing Solution Being Damaged by a Short

The TMUXHS221F will open the switches and protect the rest of the system by blocking the 28V as depicted in

Figure 7-3.

Figure 7-3. Protecting During a 28V Short

7.3.3 Powered-off Protection

When the TMUXHS221F is powered off the I/Os of the device remain in a high-Z state. The crosstalk, off-

isolation, and leakage remain within the Electrical Specifications.

This prevents errant voltages from reaching the rest of the system and maintains isolation when the system is

powering up.

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TMUXHS221F

SLVSIV4A – SEPTEMBER 2025 – REVISED NOVEMBER 2025

Copyright © 2025 Texas Instruments Incorporated

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Product Folder Links: TMUXHS221F