9 Detailed Description

9.1 Overview

The TMUX741xF devices are 44-V fault protected switches in a 1:1, 4 channel configuration. The devices work

well with dual supplies (±5 V to ±22 V), a single supply (8 V to 44 V), or asymmetric supplies (such as VDD = 15

V, VSS = –5 V). The overvoltage protection feature on the source pins works under powered and powered-off

conditions, allowing for use in harsh industrial environments.

9.2 Functional Block Diagram

SW

SW

S1

S2

TMUX7411F

(SELx = Logic 1)

Fault Detection/

Switch Driver/

Logic Decoder

SEL1

SEL2

SEL3

SW

SW

S3

S4

D1

D2

D3

D4

FF

SEL4

S1

S2

Fault Detection/

Switch Driver/

Logic Decoder

SEL1

SEL2

SEL3

S3

S4

D1

D2

D3

D4

FF

SEL4

SW

SW

SW

SW

TMUX7412F

(SELx = Logic 1)

S1

S2

Fault Detection/

Switch Driver/

Logic Decoder

SEL1

SEL2

SEL3

S3

S4

D1

D2

D3

D4

FF

SEL4

SW

SW

TMUX7413F

(SELx = Logic 1)

SW

SW

9.3 Feature Description

9.3.1 Low and Flat ON- Resistance

The TMUX7411F, TMUX7412F, and TMUX7413F are designed with a special switch architecture to produce

The architecture is implemented without a charge pump so no unwanted noise is produced from the device to

affect sampling accuracy.

9.3.2 Protection Features

The TMUX7411F, TMUX7412F, and TMUX7413F offer a number of protection features to enable robust system

implementations.

9.3.2.1 Input Voltage Tolerance

The maximum voltage that can be applied to any source input pin is +60 V or -60 V, allowing the device to

handle typical voltage fault condition in industrial applications. It shall be cautioned that the device is rated to

handle maximum stress of 85 V across different pins:

1. Between source pins and supply rails:

any source pin is reduced to –45 V to maintain the 85 V maximum rating across the source pin and the

supply.

2. Between source pins and one or more drain pins:

For example, if channel S1 is ON and the voltage is 40 V. In this case, the drain voltage is also 40 V. The

maximum negative voltage on any of the other source pins is –45 V to maintain the 85 V maximum rating

across the source pin and the drain pin.

TMUX7411F, TMUX7412F, TMUX7413F

SCDS404 – MARCH 2021

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