TMUX1574

SEL

S1A

D1

S1B

S2A

S2B

S3A

S3B

S4A

S4B

EN

LOGIC CONTROL*

D2

D3

D4

*Internal 6MO Pull-Down on Logic Pins

Processor

GND

VDD

VDD

VI/O

1.8V Logic

I/O

SEL

GND

JTAG

DEBUG,

SPI, GPIO

D1

D2

D3

D4

RAM

CPU

Peripherals

0.1µF

EN

S1B

S2B

S3B

S4B

SPI / JTAG / UART

Device #2

MISO / TDI / GPIO

MOSI / TDO / GPIO

SCLK / TCK / GPIO

SS / TMS / GPIO

S1A

S2A

S3A

S4A

SPI / JTAG / UART

Device #1

MISO / TDI / GPIO

MOSI / TDO / GPIO

SCLK / TCK / GPIO

SS / TMS / GPIO

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

TMUX1574

SCDS391C – OCTOBER 2018 – REVISED DECEMBER 2019

TMUX1574 Low-Capacitance, 2:1 (SPDT) 4-Channel,

Powered-Off Protected Switch with 1.8 V Logic

1

1 Features

1

•

Wide supply range: 1.5 V to 5.5 V

•

Low on-capacitance: 7.5 pF

•

Low on-resistance: 2 Ω

•

High bandwidth: 2 GHz

•

-40°C to +125°C operating temperature

•

1.8 V Logic Compatible

•

Supports Input Voltage Beyond Supply

•

Integrated Pull Down Resistor on Logic Pins

•

Bidirectional Signal Path

•

Fail-Safe Logic

•

Powered-off Protection up to 3.6 V Signals

–

Pinout compatible to SN74CBTLV3257

2 Applications

•

Flash memory sharing

•

JTAG multiplexing

•

SPI multiplexing

•

eMMC multiplexing

•

Servers

•

Data center switches & routers

•

Wireless infrastructure

•

PC & notebooks

•

Building automation

•

Grid infrastructure

•

ePOS

•

Appliances

3 Description

The TMUX1574 is a complementary metal-oxide

semiconductor

(CMOS)

switch.

The

TMUX1574

offers 2:1 SPDT switch configuration with 4-channels.

Wide operating supply of 1.5 V to 5.5 V 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 (SxA, SxB) and drain (Dx) pins

and can pass signals above supply up to VDD x 2,

with a maximum input/output voltage of 5.5 V.

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, switches can back-power the

supply rail through an internal ESD diode and cause

potential damage to the system.

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

control inputs have 1.8 V logic compatible thresholds,

ensuring both TTL and CMOS logic compatibility

when operating in the valid supply voltage range.

Integrated pull down resistor on the logic pins

removes external components to reduce system size

and cost.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

TMUX1574

TSSOP (16)

5.00 mm × 4.40 mm

UQFN (16)

2.60 mm x 1.80 mm

SOT-23-THIN (16)

4.20 mm x 2.00 mm

(1) For all available packages, see the package option addendum

at the end of the data sheet.

Application Example

Block Diagram