TMUX7309F datasheet(25/40 Pages) TI

25 / 40 page

Region 1 denotes the normal operation region of TMUX7308F and TMUX7309F where the input source voltages

stay below the fault supplies VFP and VFN. 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 TMUX7308F and TMUX7309F. The

selected TVS breakdown voltage must be less than the absolute maximum rating of the TMUX730xF 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 that system designers must impose when selecting the TVS

protection device to prevent accidental triggering of the ESD cells of the TMUX7308F and TMUX7309F 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 8-1. System Operation Regions and Proper Region of Selecting a TVS Protection Device

8.3.3 Bidirectional and Rail-to-Rail Operation

The TMUX7308F and TMUX7309F conducts equally well from source (Sx) to drain (D or Dx) or from drain (D or

Dx) to source (Sx). Each signal path has very similar characteristics in both directions. However, take note that

the overvoltage protection is implemented only on the source (Sx) side. The voltage on the drain is only allowed

to swing between VDD and VSS and no overvoltage protection is available on the drain side.

8.4 Device Functional Modes

The TMUX7308F and TMUX7309F offers two modes of operation (Normal mode and Fault mode) depending on

whether any of the input pins experience an overvoltage condition.

8.4.1 Normal Mode

In Normal mode operation, signals of up to VDD and VSS can be passed through the switch from source (Sx) to

drain (D or Dx) or from drain (D or Dx) to source (Sx). The address (Ax) pins and the enable (EN) pin determines

which switch path to turn on, according to Table 7-1 and Table 7-2. The following conditions must be satisfied for

the switch to stay in the ON condition:

• The difference between the primary supplies (VDD – VSS) must be higher or equal to 8 V. With a minimum

VDD of 5 V.

• The input signals on the source (Sx) or the drain (D or Dx) must be be between VFP+ VT and VFN – VT.

• The digital logic control (Ax and EN) must have selected the switch.

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TMUX7308F

SCDS403A – FEBRUARY 2021 – REVISED OCTOBER 2021

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