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TMUX1574

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SCDS391C – OCTOBER 2018 – REVISED DECEMBER 2019

Product Folder Links: TMUX1574

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Feature Description (continued)

8.3.3 1.8 V Logic Compatible Inputs

The TMUX1574 has 1.8-V logic compatible control inputs. Regardless of the VDD voltage, the control input

thresholds remain fixed, allowing a 1.8-V processor GPIO to control the TMUX1574 without the need for an

external translator. This saves both space and BOM cost. For more information on 1.8 V logic implementations,

refer to Simplifying Design with 1.8 V logic Muxes and Switches.

8.3.4 Powered-off Protection

Powered-off protection up to 3.6 V on the signal path of the TMUX1574 provides isolation when the supply

voltage is removed (VDD = 0 V). When the TMUX1574 is powered-off, the I/Os of the device remain in a high-Z

state. Powered-off protection minimizes system complexity by removing the need for power supply sequencing

on the signal path. The device performance remains within the leakage performance mentioned in the Electrical

Specifications. For more information on powered-off protection, refer to Eliminate Power Sequencing with

Powered-off Protection Signal Switches.

8.3.5 Fail-Safe Logic

The TMUX1574 has Fail-Safe Logic on the control input pins (SELx) which allows for operation up to 5.5 V,

regardless of the state of the supply pin. This feature allows voltages on the control pins to be applied before the

supply pin, protecting the device from potential damage. Fail-Safe Logic minimizes system complexity by

removing the need for power supply sequencing on the logic control pins. For example, the Fail-Safe Logic

feature allows the select pins of the TMUX1574 to be ramped to 5.5 V while VDD = 0 V. Additionally, the feature

enables operation of the TMUX1574 with VDD = 1.5 V while allowing the select pins to interface with a logic level

of another device up to 5.5 V.

8.3.6 Low Capacitance

The TMUX1574 has very low capacitance in both the ON and OFF states on the source and drain pins. Low

capacitance helps to reduce large overshoots and ringing of an amplifier circuit when the switch is connected to

the feedback network. Additionally, low capacitance improves system settling time by reducing the switch time

constant formed by the On-resistance and On-capacitance. For more information on the benefits of low

capacitance refer to Improve Stability Issues with Low CON Multiplexers.

8.3.7 Integrated Pull-Down Resistors

The TMUX1574 has internal weak pull-down resistors (6 MΩ) to GND to ensure the logic pins are not left

floating. This feature integrates up to four external components and reduces system size and cost.