TMUX1511PWR datasheet(13/22 Pages) TI1

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TMUX1511

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SCDS390 – SEPTEMBER 2018

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Feature Description (continued)

8.3.4 Powered-off Protection

Powered-off protection up to 3.6 V on the signal path of the TMUX1511 provides isolation when the supply

voltage is removed (VDD = 0 V). When the TMUX1511 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 1.8 V logic implementations refer to Eliminate Power Sequencing with

Powered-off Protection Signal Switches

8.3.5 Fail-Safe Logic

The TMUX1511 support Fail-Safe Logic on the control input pins (SELx) allowing for operation up to 5.5 V,

regardless of the state of the supply pin. This feature allows voltages on the digital 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 TMUX1511 to be ramped to 5.5 V while VDD = 0 V. Additionally, the feature

enables operation of the TMUX1511 with VDD = 1.5 V while allowing the select pins to interface with a logic level

of another device up to 5.5 V.

8.4 Device Functional Modes

The select (SELx) pins are active-high logic pins that control the connection between the source (Sx) and drain

(Dx) pins of the device. The TMUX1511 has internal weak pull-down resistors (6 MΩ) to GND so that it powers-

on with the switches disabled. When a given select pin of the TMUX1511 is pulled high, the corresponding switch

conducts from the source to drain. When any of the select pins are pulled low, the corresponding switch is in an

open state (HI-Z). Each channel of the TMUX1511 can be controlled independently through the associated select

pin, or all four select pins can be tied together for simultaneous control of all channels with a single GPIO.

8.5 Truth Tables

Table 1 shows the truth table for the TMUX1511.

Table 1. TMUX1511 Truth Table

SELx

Sx / Dx: STATE

Hi-Z (OFF)

Conducting (ON)

TMUX1511PWR Datasheet(PDF) 13 Page - Texas Instruments