TMUX7208 datasheet(32/52 Pages) TI

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9 Detailed Description

9.1 Overview

The TMUX7208 is an 8:1, 1-channel multiplexer and the TMUX7209 is a 4:1, 2 channel multiplexer. Each

channel is turned on or turned off based on the state of the address lines and enable pin.

9.2 Functional Block Diagram

VDD

VSS

TMUX7208

Logic Decoder

S1A

TMUX7209

Logic Decoder

S4A

S1B

S4B

VDD

VSS

9.3 Feature Description

9.3.1 Bidirectional Operation

The TMUX7208 and TMUX7209 conduct equally well from source (Sx) to drain (D) or from drain (D) to source

(Sx). Each channel has similar characteristics in both directions and supports both analog and digital signals.

9.3.2 Rail-to-Rail Operation

The valid signal path input or output voltage for TMUX7208 and TMUX7209 ranges from VSS to VDD.

9.3.3 1.8 V Logic Compatible Inputs

TMUX7208 and TMUX7209 have 1.8-V logic compatible control for all logic control inputs. 1.8-V logic level

inputs allows the 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.

9.3.4 Integrated Pull-Down Resistor on Logic Pins

The TMUX720x has internal weak pull-down resistors to GND to ensure the logic pins are not left floating. The

value of this pull-down resistor is approximatly 4 MΩ, but is clamped to about 1uA at higher voltages. This

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

9.3.5 Fail-Safe Logic

TMUX7208 and TMUX7209 support Fail-Safe Logic on the control input pins (EN and Ax) allowing it to operate

up to 44 V, 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-Safe Logic feature allows the TMUX7208 and TMUX7209 logic input pins to ramp up to +44 V while VDD

and VSS = 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.

TMUX7208, TMUX7209

SCDS418D – JULY 2020 – REVISED SEPTEMBER 2021

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