PCA9544A

Slaves A , A ...A

0

1

N

Slaves B , B ...B

0

1

N

I2C or SMBus

Master

(e.g. µProcessor)

SDA

SCL

INT

SD0

SC0

INT0

Channel 0

Channel 1

SD1

SC1

INT1

V

CC

A0

A1

GND

A2

Slaves B , B ...B

0

1

N

Channel 2

SD2

SC2

INT2

Slaves B , B ...B

0

1

N

Channel 3

SD3

SC3

INT3

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PCA9544A

SCPS146E – OCTOBER 2005 – REVISED JUNE 2014

1 Features

2 Applications

1

•

1-of-4 Bidirectional Translating Switches

•

Servers

•

•

Routers (Telecom Switching Equipment)

•

Four Active-Low Interrupt Inputs

•

Factory Automation

•

Active-Low Interrupt Output

•

Example, Multiple, Identical Temp Sensors)

•

Three Address Pins, Allowing up to Eight Devices

3 Description

•

The PCA9544A is a quad bidirectional translating

•

Power Up With All Switch Channels Deselected

•

upstream pair fans out to four downstream pairs, or

channels. One SCL/SDA pair can be selected at a

•

Allows Voltage-Level Translation Between 1.8-V,

time, and this is determined by the contents of the

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

programmable control register. Four interrupt inputs

•

No Glitch on Power Up

(INT3–INT0), one for each of the downstream pairs,

•

Supports Hot Insertion

are provided. One interrupt output (INT) acts as an

AND of the four interrupt inputs.

•

Low Standby Current

•

Operating Power-Supply Voltage Range of

A power-on reset function puts the registers in their

2.3 V to 5.5 V

with no channel selected.

•

5.5-V Tolerant Inputs

•

0 to 400-kHz Clock Frequency

The pass gates of the switches are constructed such

•

Latch-Up Performance Exceeds 100 mA Per

high voltage, which will be passed by the PCA9544A.

JESD 78

This allows the use of different bus voltages on each

•

ESD Protection Exceeds JESD 22

pair, so that 1.8-V, 2.5-V, or 3.3-V parts can

–

2000-V Human-Body Model (A114-A)

communicate with 5-V parts, without any additional

protection. External pull-up resistors pull the bus up

–

200-V Machine Model (A115-A)

to the desired voltage level for each channel. All I/O

–

1000-V Charged-Device Model (C101)

pins are 5-V tolerant.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

PCA9544A

TSSOP (20)

6.50 mm × 4.40 mm

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

the end of the data sheet.

4 Simplified Application Diagram

1

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.