8 Detailed Description

8.1 Functional Block Diagram

The TMUX7236 is a 2:1, 2-channel multiplexer or demultiplexer. Each input is turned on or turned off based on

the state of the select lines and enable pin.

S1A

S1B

D1

Log ic

Decoder

S2A

S2B

D2

SEL1

SEL2

EN

8.2 Feature Description

8.2.1 Bidirectional Operation

The TMUX7236 conducts equally well from source (Sx) to drain (Dx) or from drain (Dx) to source (Sx). Each

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

8.2.2 Rail to Rail Operation

8.2.3 1.8 V Logic Compatible Inputs

The TMUX7236 has 1.8-V logic compatible control for all logic control inputs. 1.8-V logic level inputs allows the

TMUX7236 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.

8.2.4 Integrated Pull-Down Resistor on Logic Pins

The TMUX7236 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 approximately 4 MΩ, but is clamped to about 1 µA at higher voltages. This

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

8.2.5 Fail-Safe Logic

The TMUX7236 supports Fail-Safe Logic on the control input pins (EN and SEL) allowing for operation up to 44

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

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

does not offer protection against negative overvoltage conditions.

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TMUX7236

SCDS417 – MARCH 2022

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Product Folder Links: TMUX7236