TMUX1574DYYR datasheet(25/44 Pages) TI

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Processor

GND

VDD

1.8 V

1.8V Logic

I/O

SEL

GND

SPI PORT

RAM

CPU

Peripherals

0.1µF

S1B

S2B

S3B

S4B

FLASH Device #2

S1A

S2A

S3A

S4A

FLASH Device #1

MISO

MOSI

SCLK

MISO

MOSI

SCLK

VI/O

3.3 V

TMUX1574

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SCDS391C – OCTOBER 2018 – REVISED DECEMBER 2019

Product Folder Links: TMUX1574

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9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

The TMUX15xx family offers high-speed system performance across a wide operating supply (1.5 V to 5.5 V)

and operating temperature (-40°C to +125°C). The TMUX1574 supports a number of features that improve

system performance such as 1.8 V logic compatibility, supports input voltages beyond supply, Fail-Safe Logic,

and Powered-off Protection up to 3.6 V. These features make the TMUX15xx a family of protection multiplexers

and switches that can reduce system complexity, board size, and overall system cost.

9.2 Typical Application

Common applications that require the features of the TMUX1574 include multiplexing various protocols from a

possessor or MCU such as SPI, JTAG, or standard GPIO signals. The TMUX1574 provides superior isolation

performance when the device is powered. The added benefit of powered-off protection allows a system to

minimize complexity by eliminating the need for power sequencing in hot-swap and live insertion applications.

The example shown in Figure 42 illustrates the use of the TMUX1574 to multiplex an SPI bus to multiple flash

memory devices.

Figure 42. Multiplexing Flash Memory

9.2.1 Design Requirements

For this design example, use the parameters listed in Table 2.

Table 2. Design Parameters

PARAMETERS

VALUES

Supply (VDD)

3.3 V

Input / Output signal range

0 V to 3.3 V

Control logic thresholds

1.8 V compatible

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