TMUX1574DYYR datasheet(22/45 Pages) TI2

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TMUX1574

SEL

S1A

S1B

S2A

S2B

S3A

S3B

S4A

S4B

LOGIC CONTROL*

*Internal 6MO Pull-Down on Logic Pins

TMUX1574

SCDS391C – OCTOBER 2018 – REVISED DECEMBER 2019

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Product Folder Links: TMUX1574

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8 Detailed Description

8.1 Overview

The TMUX1574 is a high speed 2:1 (SPDT) 4-ch. switch with powered-off protection up to 3.6 V. Wide

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

communication equipment to industrial applications. The device supports bidirectional analog and digital

signals on the source (SxA, SxB) and drain (Dx) pins. The wide bandwidth of this switch allows little or no

attenuation of high-speed signals at the outputs to pass with minimum edge and phase distortion as well as

propagation delay.

The enable (EN) pin is an active-low logic pin that controls the connection between the source (SxA, SxB)

and drain (Dx) pins of the device. The select pin (SEL) controls the state of all four channels of the

TMUX1574 and determines which source pin is connected to the drain. 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 3.6 V on the signal path of the TMUX1574 provides isolation when the supply

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

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

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Bidirectional Operation

The TMUX1574 conducts equally well from source (SxA, SxB) to drain (Dx) or from drain (Dx) to source (SxA,

SxB). Each channel has very similar characteristics in both directions and supports both analog and digital

signals.

8.3.2 Beyond Supply Operation

When the TMUX1574 is powered from 1.5 V to 5.5 V, the valid signal path input/output voltage ranges from

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

Example 1: If the TMUX1574 is powered at 1.5V, the signal range is 0 V to 3 V.

Example 2: If the TMUX1574 is powered at 3V, the signal range is 0 V to 5.5 V.

Example 3: If the TMUX1574 is powered at 5.5V, the signal range is 0 V to 5.5 V.

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

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

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