9 Detailed Description

9.1 Overview

The TMUX7211, TMUX7212, and TMUX7213 are 1:1 (SPST), 4-Channel switches. The devices have four

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

SW

SW

SW

SW

S1

S2

S3

S4

SEL1

SEL2

SEL3

SEL4

D1

D2

D3

D4

S1

S2

S3

S4

D1

D2

D3

D4

SW

SW

SW

SW

S1

S2

S3

S4

D1

D2

D3

D4

SW

SW

SW

SW

SEL1

SEL2

SEL3

SEL4

SEL1

SEL2

SEL3

SEL4

TMUX7211

(SELx = Logic 1)

TMUX7212

(SELx = Logic 1)

TMUX7213

(SELx = Logic 1)

Figure 9-1. TMUX721x Functional Block Diagram

9.3 Feature Description

9.3.1 Bidirectional Operation

The TMUX721x conducts equally well from source (Sx) to drain (Dx) or from drain (Dx) to source (Sx). Each

channel has 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 TMUX721x devices have 1.8-V logic compatible control for all logic control inputs. 1.8-V logic level inputs

allows the TMUX721x 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. 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 TMUX721x supports Fail-Safe Logic on the control input pins (SEL1, SEL2, SEL3, and SEL4) allowing for

operation up to 44 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-

logic control inputs are protected against positive faults of up to +44 V in powered-off condition, but do not offer

protection against negative overvoltage conditions.

www.ti.com

TMUX7211, TMUX7212, TMUX7213

SCDS416 – DECEMBER 2020

Copyright © 2020 Texas Instruments Incorporated

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Product Folder Links: TMUX7211 TMUX7212 TMUX7213