S1

S2

SEL1

D1

D2

S1

S2

D1

D2

S1

S2

D1

D2

TMUX1121

TMUX1122

TMUX1123

SEL2

SEL1

SEL2

SEL1

SEL2

ALL S WIT CHES SHOWN F OR A LO GI C 0 INPUT

CHANNEL 1

CHANNEL 2

CHANNE L 1

CHANNEL 2

CHANNEL 1

CHANNEL 2

21

TMUX1121, TMUX1122, TMUX1123

www.ti.com

SCDS413 – AUGUST 2019

Product Folder Links: TMUX1121 TMUX1122 TMUX1123

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9 Detailed Description

9.1 Overview

The TMUX1121, TMUX1122, and TMUX1123 are 1:1 (SPST), 2-Channel switches. The devices have two

independently selectable single-pole, single-throw switches that are turned-on or turned-off based on the state of

the corresponding select pin.

9.2 Functional Block Diagram

Figure 25. TMUX112x Functional Block Diagram

9.3 Feature Description

9.3.1 Bidirectional operation

The TMUX112x conducts equally well from source (Sx) to drain (Dx) or from drain (Dx) to source (Sx). Each

channel has very similar characteristics in both directions and supports both analog and digital signals.

9.3.2 Rail to rail operation

9.3.3 1.8 V Logic compatible inputs

The TMUX112x devices have 1.8-V logic compatible control for all logic control inputs. The logic input thresholds

scale with supply but still provide 1.8-V logic control when operating at 5.5 V supply voltage. 1.8-V logic level

inputs allows the TMUX112x devices to interface with processors that have lower logic I/O rails and eliminates

the need for an external translator, which saves both space and BOM cost. The current consumption of the

TMUX112x devices increase when using 1.8V logic with higher supply voltage as shown in Figure 10. For more

information on 1.8 V logic implementations refer to Simplifying Design with 1.8 V logic Muxes and Switches

9.3.4 Fail-safe logic

The TMUX112x supports Fail-Safe Logic on the control input pins (EN, A0, A1) allowing for operation up to 5.5

V, regardless of the state of the supply pin. This feature allows voltages on the control pins to be applied before

the supply pin, protecting the device from potential damage. Fail-Safe Logic minimizes system complexity by

removing the need for power supply sequencing on the logic control pins. For example, the Fail-Safe Logic

of another device up to 5.5 V.