TCA9548A

I2C or SMBus

Master

(processor)

SDA

SCL

SD0

SC0

Channel 0

Channel 1

Channel 7

RESET

SD1

SC1

SD7

SC7

VCC

A1

A2

GND

A0

Channel 2

SD2

SC2

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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.

TCA9548A

SCPS207F – MAY 2012 – REVISED NOVEMBER 2016

1

1 Features

1

•

1-to-8 Bidirectional Translating Switches

•

•

Active-Low Reset Input

•

Three Address Pins, Allowing up to Eight

•

Combination

•

Power Up With All Switch Channels Deselected

•

•

Allows Voltage-Level Translation Between 1.8-V,

2.5-V, 3.3-V, and 5-V Buses

•

No Glitch on Power Up

•

Supports Hot Insertion

•

Low Standby Current

•

Operating Power-Supply Voltage Range of

1.65 V to 5.5 V

•

5-V Tolerant Inputs

•

0- to 400-kHz Clock Frequency

•

Latch-Up Performance Exceeds 100 mA Per

JESD 78, Class II

•

ESD Protection Exceeds JESD 22

–

±2000-V Human-Body Model (A114-A)

–

200-V Machine Model (A115-A)

–

±1000-V Charged-Device Model (C101)

2 Applications

•

Servers

•

Routers (Telecom Switching Equipment)

•

Factory Automation

•

as Multiple, Identical Temperature Sensors)

3 Description

The

TCA9548A

device

has

eight

bidirectional

translating switches that can be controlled through

eight downstream pairs, or channels. Any individual

SCn/SDn channel or combination of channels can be

selected,

determined

by

the

contents

of

the

programmable control register. These downstream

conflicts.

For

example,

if

eight

identical

digital

temperature sensors are needed in the application,

one sensor can be connected at each channel: 0-7.

The system master can reset the TCA9548A in the

event of a time-out or other improper operation by

asserting a low in the RESET input. Similarly, the

power-on reset deselects all channels and initializes

causes the same reset and initialization to occur

without powering down the part. This allows recovery

a low state.

The pass gates of the switches are constructed so

that the VCC pin can be used to limit the maximum

high voltage, which is passed by the TCA9548A.

Limiting the maximum high voltage allows the use of

different bus voltages on each pair, so that 1.8-V, 2.5-

V or 3.3-V parts can communicate with 5-V parts,

without any additional protection. External pullup

resistors pull the bus up to the desired voltage level

for each channel. All I/O pins are 5-V tolerant.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

TCA9548A

TSSOP (24)

7.80 mm × 4.40 mm

VQFN (24)

4.00 mm × 4.00 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Simplified Application Diagram