8 Detailed Description

8.1 Overview

The TMUX1101 and TMUX1102 are 1:1 (SPST) switches. The TMUX110x devices have a controllable single-

pole, single-throw switch that is turned on or off based on the state of the select pin. The switch of the

TMUX1101 is turned on with a Logic 1 on the select pin, while a Logic 0 is required to turn on switch in the

TMUX1102. The following figure shows the functional block diagram for the TMUX110x devices.

8.2 Functional Block Diagram

TMUX1101

SEL

S

D

TMUX1102

SEL

S

ALL SWITC HES SHOWN FOR A LOG IC 0 INPUT

D

8.3 Feature Description

8.3.1 Bidirectional Operation

The TMUX110x conducts equally well from source (S) to drain (D) or from drain (D) to source (S). Each channel

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

8.3.2 Rail-to-Rail Operation

The valid signal path input/output voltage for TMUX110x ranges from GND to VDD.

8.3.3 1.8V Logic Compatible Inputs

The TMUX110x devices have 1.8V logic compatible control for all logic control inputs. The logic input thresholds

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

inputs allows the TMUX110x 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

TMUX110x devices increase when using 1.8V logic with higher supply voltage as shown in Figure 6-10. For

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

8.3.4 Fail-Safe Logic

The TMUX110x supports Fail-Safe Logic on the control input pin (SEL) allowing for operation up to 5.5V,

regardless of the state of the supply pin. This feature allows voltages on the control pin 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 pin. For example, the Fail-Safe Logic

feature allows the select pin of the TMUX110x devices to be ramped to 5.5V while VDD = 0V. Additionally, the

feature enables operation of the TMUX110x with VDD = 1.2V while allowing the select pin to interface with a logic

level of another device up to 5.5V.

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TMUX1101, TMUX1102

SCDS410D – MARCH 2019 – REVISED FEBRUARY 2024

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Product Folder Links: TMUX1101 TMUX1102