TMUX7412F datasheet(32/42 Pages) TI

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9.3.2.7 EMC Protection

The TMUX7411F, TMUX7412F, and TMUX7413F are not intended for standalone electromagnetic compatibility

(EMC) protection in industrial applications. There are three common high voltage transient specifications

that govern industrial high voltage transient specification: IEC61000-4-2 (ESD), IEC61000-4-4 (EFT), and

IEC61000-4-5 (surge immunity). A transient voltage suppressor (TVS), along with some low-value series current

limiting resistor, are required to prevent source input voltages from going above the rated ±60 V limits.

When selecting a TVS protection device, it is critical to ensure that the maximum working voltage is greater than

both the normal operating range of the input source pins to be protected and any known system common-mode

overvoltage that may be present due to miswiring, loss of power, or short circuit. Figure 9-1 shows ane example

of the proper design window when selecting a TVS device.

Region 1 denotes normal operation region of TMUX7411F, TMUX7412F, and TMUX7413F, where the input

source voltages stay below the supplies VDD and VSS. Region 2 represents the range of possible persistent

DC (or long duration AC overvoltage fault) presented on the source input pins. Region 3 represents the

margin between any known DC overvoltage level and the absolute maximum rating of the TMUX741xF. The

TVS breakdown voltage must be selected to be less than the absolute maximum rating of the TMUX7411F,

TMUX7412F, and TMUX7413F, but greater than any known possible persistent DC or long duration AC

overvoltage fault to avoid triggering the TVS inadvertently. Region 4 represents the margin system designers

must impose when selecting the TVS protection device to prevent accidental triggering of ESD cells of the

TMUX7411F, TMUX7412F, and TMUX7413F devices.

Normal Operation

Positive Supply

VDD

System

Overvoltage

Protection Window

Device Absolute

Max Rating

Internal ESD

Trigger Voltage

TVS

Breakdown

Voltage

Negative Supply

VSS

0 V

Overvoltage

Protection Window

TVS

Breakdown

Voltage

System

Overvoltage

Device Absolute

Max Rating

Internal ESD

Trigger Voltage

Figure 9-1. System Operation Regions and Proper Region of Selecting a TVS Protection Device

9.3.3 Overvoltage Fault Flags

The voltages on the source input pins of the TMUX7411F, TMUX7412F, and TMUX7413F are continuously

monitored, and the status of whether an overvoltage condition occurs is indicated by an active low general fault

flag (FF). The voltage on the FF pin indicates if any of the source input pins are experiencing an overvoltage

condition. If any source pin voltage exceeds the fault supply voltages by a VT, the FF output is pulled-down to

below VOL.

The FF pin is an open-drain output and an external pull-up resistor of 1 kΩ is recommended. The pull-up voltage

can be in the range of 1.8 V to 5.5 V, depending on the controller voltage the device interfaces with.

TMUX7411F, TMUX7412F, TMUX7413F

SCDS404A – MARCH 2021 – REVISED NOVEMBER 2021

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