TMUX7413FRRPR datasheet(33/48 Pages) TI

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9.3.2.2 Powered-Off Protection

When the supplies of TMUX7411F, TMUX7412F, and TMUX7413F are removed (VDD/ VSS = 0 V or floating), the

source (Sx) pins of the device remain in high impedance (Hi-Z) state, and the device performance remains within

the leakage performance. Powered-off protection minimizes system complexity by removing the need to control

power supply sequencing of the system. The feature prevents errant voltages on the input source pins from

reaching the rest of the system and maintains isolation when the system is powering up. Without powered-off

protection, signals on the input source pins can back-power the supply rails through internal ESD diodes and

cause potential damage to the system.

A GND reference must always be present to ensure proper operation. Source and drain voltage levels of up to

±60 V are blocked in the powered-off condition.

9.3.2.3 Fail-Safe Logic

Fail-safe logic circuitry allows voltages on the logic control pins to be applied before the supply pins, protecting

the device from potential damage. The switch is specified to be in the OFF state, regardless of the state of the

logic signals. The logic inputs are protected against positive faults of up to +44 V in powered-off condition, but do

not offer protection against negative overvoltage condition.

Fail-safe logic also allows the TMUX741xF devices to interface with a voltage greater than VDD during normal

operation to add maximum flexibility in system design. For example, with a VDD of = 15 V, the logic control

pins could be connected to +24 V for a logic high signal which allows different types of signals, such as analog

feedback voltages, to be used when controlling the logic inputs. Regardless of the supply voltage, the logic

inputs can be interfaced as high as 44 V.

9.3.2.4 Overvoltage Protection and Detection

The TMUX7411F, TMUX7412F, and TMUX7413F detect overvoltage inputs by comparing the voltage on a

source pin (Sx) with the supplies (VDD and VSS). A signal is considered overvoltage if it exceeds the supply

voltages by the threshold voltage (VT).

The switch automatically turns OFF regardless of the logic controls when an overvoltage is detected. The source

pin becomes high impedance and ensures only small leakage current flows through the switch. The drain pin

(Dx) is left floating when the fault channel is selected by the logic control. For example, if the source voltage

exceeds VDD or VSS, then the drain output is left floating and the circuit connected to the drain pin, such as RL

and CL, determines the final voltage.

9.3.2.5 ESD Protection

All pins on the TMUX7411F, TMUX7412F, and TMUX7413F support HBM ESD protection level up to ±6 kV,

which helps prevent the device from being damaged by ESD events during manufacturing process.

The drain pins (Dx) have internal ESD protection diodes to the supplies VDD and VSS, therefore the voltage at

the drain pins must not exceed the supply voltages to prevent excessive diode current. The source pins have

specialized ESD protection that allows the signal voltage to reach ±60 V regardless of the supply voltage level.

Exceeding ±60 V on any source input may damage the ESD protection circuitry on the device and cause the

device to malfunction if the damage is excessive.

9.3.2.6 Latch-Up Immunity

Latch-up is a condition where a low impedance path is created between a supply pin and ground. This condition

is caused by a trigger (current injection or overvoltage), but once activated, the low impedance path remains

even after the trigger is no longer present. This low impedance path may cause system upset or catastrophic

damage due to excessive current levels. The latch-up condition typically requires a power cycle to eliminate the

low impedance path.

In the TMUX7411F, TMUX7412F, and TMUX7413F devices, an insulating oxide layer is placed on top of the

silicon substrate to prevent any parasitic junctions from forming. As a result, the devices are latch-up immune

under all circumstances by device construction.

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TMUX7411F, TMUX7412F, TMUX7413F

SCDS404B – MARCH 2021 – REVISED NOVEMBER 2022

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Product Folder Links: TMUX7411F TMUX7412F TMUX7413F

TMUX7413FRRPR Datasheet(PDF) 33 Page - Texas Instruments

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