TMUX1574DYYR datasheet(24/44 Pages) TI

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TMUX1574

SCDS391C – OCTOBER 2018 – REVISED DECEMBER 2019

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8.4 Device Functional Modes

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. When the enable pin is pulled high, all switches are turned off. When the enable is

pulled low, the select pin controls the signal path selection. The select pin (SEL) controls the state of all four

channels of the TMUX1574 and determines which source pin is connected to the drain pins. When the select pin

is pulled low, the SxA pin conducts to the corresponding Dx pins. When the select pin is pulled high, the SxB pin

conducts to the corresponding Dx pins. The TMUX1574 logic pins have internal weak pull-down resistors (6 MΩ)

to GND so that it powers-on in a known state.

The TMUX1574 can be operated without any external components except for the supply decoupling capacitors.

Unused logic control pins should be tied to GND or VDD in order to ensure the device does not consume

additional current as highlighted in Implications of Slow or Floating CMOS Inputs. Unused signal path inputs

(SxA, SxB, or Dx) should be connected to GND.

8.5 Truth Tables

(1)

X denotes don't care.

Table 1. TMUX1574 Truth Table

INPUTS

Selected Source Pins Connected To Drain Pins (Dx)

SEL

S1A connected to D1

S2A connected to D2

S3A connected to D3

S4A connected to D4

S1B connected to D1

S2B connected to D2

S3B connected to D3

S4B connected to D4

X(1)

Hi-Z (OFF)

TMUX1574DYYR Datasheet(PDF) 24 Page - Texas Instruments