7 Detailed Description

7.1 Overview

The TMUX121 is an analog passive 2 channel 2:1 (SPDT) that can work for any low-speed, high-speed,

differential or single ended signals. Excellent low capacitance characteristics of the device allow signal switching

with minimal attenuation and very little added jitter. The signals must be within the allowable voltage range of 0

to 3.6 V.

7.2 Functional Block Diagram

Charge

Pump

D1

D2

S1A

S2A

S1B

S2B

SEL

EN

VDD

GND

7.3 Feature Description

7.3.1 Enable and Low Power Mode

The TMUX121 can be placed in a power saving mode by pulling EN high. This reduces the supply power

consumption from 12 µA to 1.5 µA. which is extremely beneficial for systems where saving power is critical.

7.4 Device Functional Modes

Table 7-1. Mux Configuration Control Logic for TMUX121 (1)

SEL

EN

Mux Configuration

L

L

D to SA

H

L

D to SB

X

H

All channels are disabled and Hi-Z

(1)

The TMUX121 can tolerate polarity inversions for differential signals. Keep the polarity consistent

for all differential pairs.

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TMUX121

SCDS381 – AUGUST 2023

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