7.4 Input and Output Leakage Current Under Overvoltage Fault

If any of the source pin voltage goes above the supplies (VDD or VSS) by one threshold voltage (VT), then the

overvoltage protection feature of the TMUX7436F is triggered to turn off the switch under fault, keeping the

fault channel in a high-impedance state. IS(FA) and ID(FA) denotes the input and output leakage current under

overvoltage fault conditions, respectively. When the overvoltage fault occurs, the supply (or supplies) can either

be in normal operating condition (Figure 7-4) or abnormal operating condition (Figure 7-5). During abnormal

operating condition, the supply (or supplies) can either be unpowered (VDD= VSS = 0 V) or floating (VDD= VSS =

no connection), and remains within the leakage performance specifications.

S1A

GND

VS

D1

VD

A

IS (FA)

S1B

VDD

VSS

S2A

VS

D2

VD

A

IS (FA)

S2B

A

ID (FA)

A

ID (FA)

N.C.

N.C.

IS(FA) / ID(FA)

( |VS| > |VDD + VT| or |VSS - VT| )

Figure 7-4. Measurement Setup for Input and Output Leakage Current under Overvoltage Fault With

Normal Supplies

S1A

GND

VS

D1

A

IS (FA)

S1B

S2A

VS

D2

A

IS (FA)

S2B

A

ID (FA)

A

ID (FA)

N.C.

N.C.

S1A

GND

VS

D1

A

IS (FA)

S1B

S2A

VS

D2

A

IS (FA)

S2B

A

ID (FA)

A

ID (FA)

N.C.

N.C.

VDD

VSS

GND

VDD

VSS

N.C.

Unpowered

(VDD = VSS = GND = 0 V)

Floating

(VDD = VSS = N.C.)

Figure 7-5. Measurement Setup for Input and Output Leakage Current under Overvoltage Fault With

Unpowered or Floating Supplies

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TMUX7436F

SCDS459 – OCTOBER 2022

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