7 Detailed Description

7.1 Overview

The TMUXHS221 is an analog passive mux with 2:1/1:2 multiplexer/demultiplexer that can work for any low-

speed, high-speed, differential or single ended signals. The signals must be within the allowable voltage range of

−0.3 to 3.6 V. The device is optimized for eUSB2 and USB 2.0 LS, FS, and HS signaling.

Excellent dynamic characteristics of the device allow high speed switching with minimal attenuation to the signal

eye diagram with very little added jitter. While the device is recommended for the interfaces up to 3 Gbps, actual

data rate where the device can be used highly depends on the electrical channels. For low loss channels where

adequate margin is maintained, the device can potentially be used for higher data rates.

7.2 Functional Block Diagram

Charge Pump

/Gate Drive

D+

D-

DA+

DA-

DB+

DB-

SEL

OEn

VCC

GND

7.3 Feature Description

7.3.1 Output Enable and Power Savings

The TMUXHS221 has two power modes: Active or Normal operating mode and Standby or Shutdown mode.

During Standby mode, the device consumes very-little current to achieve ultra low power in systems where

saving power is critical. To enter Standby mode, OEn must be pulled high.

7.3.2 Data Line Biasing

The TMUXHS221 does not contain any internal biasing. All channels of the device must be biased from either of

the two sides to avoid floating channels.

7.4 Device Functional Modes

Table 7-1. Mux Configuration Control Logic for TMUXHS221(1)

SEL

OEn

Mux Configuration

L

L

D to DA

H

L

D to DB

X

H

All channels are disabled and Hi-Z

(1)

The TMUXHS221 can tolerate polarity inversions for differential signals. Ensure that the polarity

consistency is maintained for all differential pairs.

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TMUXHS221

SLASF52A – AUGUST 2022 – REVISED NOVEMBER 2022

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Product Folder Links: TMUXHS221