8 Detailed Description

8.1 Overview

The TMUX6219-Q1 is a 2:1, 1-channel switch. Each input is turned on or turned off based on the state of the

select line and enable pin.

8.2 Functional Block Diagram

Figure 8-1 shows the functional block diagram of the TMUX7219-Q1.

S1

S2

EN

D

Decoder

SEL

Figure 8-1. TMUX7219-Q1 Functional Block Diagram

8.3 Feature Description

8.3.1 Bidirectional Operation

The TMUX7219-Q1 conducts equally well from source (Sx) to drain (D) or from drain (D) to source (Sx). Each

channel has very similar characteristics in both directions and supports both analog and digital signals.

8.3.2 Rail-to-Rail Operation

8.3.3 1.8 V Logic Compatible Inputs

The TMUX7219-Q1 has 1.8 V logic compatible control for all logic control inputs. 1.8 V logic level inputs allows

the device to interface with processors that have lower logic I/O rails and eliminates the need for an external

translator, which 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 Fail-Safe Logic

The TMUX7219-Q1 supports Fail-Safe Logic on the control input pins (EN, SEL) allowing for operation up to 44

V above ground, regardless of the state of the supply pins. 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-

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

not offer protection against negative overvoltage conditions.

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TMUX7219-Q1

SCDS438 – JANUARY 2021

Copyright © 2021 Texas Instruments Incorporated

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Product Folder Links: TMUX7219-Q1