TMUX1511 datasheet(21/45 Pages) TI2

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7 Detailed Description

7.1 Overview

The TMUX1511 is a high speed 1:1 (SPST) 4-channel switch with powered-off protection up to 3.6V. Wide

operating supply of 1.5V to 5.5V allows for use in a broad array of applications from servers and communication

equipment to industrial applications. The device supports bidirectional analog and digital signals on the source

(Sx) and drain (Dx) pins. The wide bandwidth of this switch allows little or no attenuation of the high-speed

signals at the outputs to pass with minimum edge and phase distortion as well as propagation delay.

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

(Dx) pins of the device. 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.

Fail-Safe Logic circuitry allows voltages on the logic control pins to be applied before the supply pin, protecting

the device from potential damage. All logic control inputs have 1.8V logic compatible thresholds, ensuring both

TTL and CMOS logic compatibility when operating in the valid supply voltage range.

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

voltage is removed (VDD = 0V). Without this protection feature, the system can back-power the supply rail

through an internal ESD diode and cause potential damage to the system.

7.2 Functional Block Diagram

RWB Package

SEL1

SEL2

*Internal 6MΩ Pull-Down on Logic Pins

TMUX1511

SEL1

SEL2

SEL4

SEL3

*Internal 6MO Pull-Down on Logic Pins

7.3 Feature Description

7.3.1 Bidirectional Operation

The TMUX1511 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.

7.3.2 Beyond Supply Operation

When the TMUX1511 is powered from 1.5V to 5.5V, the valid signal path input/output voltage ranges from GND

to VDD x 2, with a maximum input/output voltage of 5.5V.

Example 1: If the TMUX1511 is powered at 1.5V, the signal range is 0V to 3V.

Example 2: If the TMUX1511 is powered at 3V, the signal range is 0V to 5.5V.

Example 3: If the TMUX1511 is powered at 5.5V, the signal range is 0V to 5.5V.

Other voltage levels not mentioned in the examples will support Beyond Supply Operation as long as the supply

voltage falls within the recommended operation conditions of 1.5V to 5.5V.

7.3.3 1.8V Logic Compatible Inputs

The TMUX1511 has 1.8V logic compatible control inputs. Regardless of the VDD voltage, the control input

thresholds remain fixed, allowing a 1.8V processor GPIO to control the TMUX1511 without the need for an

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TMUX1511

SCDS390B – SEPTEMBER 2018 – REVISED MARCH 2025

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