8 Detailed Description

8.1 Overview

The TMUX6211, TMUX6212, and TMUX6213 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.

8.2 Functional Block Diagram

S1

S2

S3

S4

SEL1

SEL2

SEL3

SEL4

D1

D2

D3

D4

TMUX1111

S1

S2

S3

S4

D1

D2

D3

D4

TMUX1112

S1

S2

S3

S4

D1

D2

D3

D4

TMUX1113

SEL1

SEL2

SEL3

SEL4

SEL1

SEL2

SEL3

SEL4

CHANNEL 1

CHANNEL 2

CHANNEL 3

CHANNEL 4

CHANNEL 1

CHANNEL 2

CHANNEL 3

CHANNEL 4

CHANNEL 1

CHANNEL 2

CHANNEL 3

CHANNEL 4

ALL SWITCHES SHOWN FOR A LOGIC 0 INPUT

Figure 8-1. TMUX621x Functional Block Diagram

8.3 Feature Description

8.3.1 Bidirectional Operation

The TMUX621x 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.

8.3.2 Rail-to-Rail Operation

8.3.3 1.8 V Logic Compatible Inputs

The TMUX621x devices have 1.8-V logic compatible control for all logic control inputs. 1.8-V logic level inputs

allows the TMUX621x 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.

8.3.4 Fail-Safe Logic

The TMUX621x supports Fail-Safe Logic on the control input pins (SEL1, SEL2, SEL3, and SEL4) allowing for

operation up to 36 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 36 V in powered-off condition, but do not offer

protection against negative overvoltage conditions.

TMUX6211, TMUX6212, TMUX6213

SCDS431 – OCTOBER 2020

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