TMUX7462F datasheet(23/30 Pages) TI

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15.1.2.4 Bidirectional and Rail-to-Rail Operation

The TMUX7462F conducts equally well from source (Sx) to drain (Dx) or from drain (Dx) to source (Sx). Each

signal path has very similar characteristics in both directions; however, it is noted that the overvoltage protection

is implemented only on the source (Sx) side. The voltage on the drain is only allowed to swing between VFP and

VFN and no overvotlage protection is available on the drain side.

The primary supplies (VDD and VSS) define the on-resistance profile of the switch channel, whereas the fault

voltage supplies (VFP and VFN) define the signal range that can be passed through from source to drain of the

device. It is good practice to use voltages on VFP and VFN that are lower than VDD and VSS to take advantage of

the flat on-resistance region of the device for better input-to-out linearity.

15.1.3 Device Functional Modes

The TMUX7462F offer two modes of operation (Normal mode and Fault mode) depending on whether any of the

input pins experience an overvoltage condition.

15.1.3.1 Normal Mode

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

drain (Dx) or from drain (Dx) to source (Sx). The following conditions must be satisfied for the switch to stay in

the ON condition:

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

• VFP must be between 3 V and VDD, and VFN must be between VSS and 0 V.

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

15.1.3.2 Fault Mode

The TMUX7462F enters into the Fault mode when any of the input signals on the source (Sx) pins exceed VFP

or VFN by a threshold voltage VT. The switch input experiencing the fault automatically turns off, and the source

pin becomes high impedance with negligible amount of leakage current flowing through the switch under the

overvoltage condition. Section 15.1.2.2.4 describes how the drain pin (Dx) behavior under the Fault mode can be

programmed. The general fault flag (FF) is asserted low in the Fault mode.

The overvoltage protection is provided only for the source (Sx) input pins. The drain (Dx) pin, if used as signal

input, must stay in between VFP and VFN at all time since no overvoltage protection is implemented on the drain

pin.

15.1.3.3 Truth Table

Table 15-1 shows the truth tables for the TMUX7462F. Each switch is independently controlled by its own select

pin.

Table 15-1. TMUX7462F Truth Table

DR PIN STATE

Dx State During Fault

Condition

Pulled up to VFP or VFN

Open (HI-Z)

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TMUX7462F

SCDS394 – MARCH 2021

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