SCL

PCA9545A

Slaves A , A ...A

0

1

N

Slaves B

0

1

N

, B ...B

Slaves C

0

1

N

, C ...C

Slaves D

0

1

N

, D ...D

I2C or SMBus

Master

(e.g. µProcessor)

SDA

INT

SD0

SC0

INT0

Channel 0

Channel 1

Channel 2

Channel 3

RESET

SD1

SC1

INT1

SD2

SC2

INT2

SD3

SC3

INT3

VCC

A0

A1

GND

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

PCA9545A

SCPS147D – OCTOBER 2005 – REVISED JUNE 2014

Functions

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

•

Multiple, Identical Temp Sensors)

•

Active-Low Reset Input

•

Two Address Terminals, Allowing up to Four

3 Description

The PCA9545A is a quad bidirectional translating

•

Combination

upstream pair fans out to four downstream pairs, or

•

Power-Up With All Switch Channels Deselected

channels.

Any

individual

SCn/SDn

channel

or

combination of channels can be selected, determined

•

by the contents of the programmable control register.

•

Allows Voltage-Level Translation Between 1.8-V,

Four interrupt inputs (INT3–INT0), one for each of the

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

downstream pairs, are provided. One interrupt (INT)

•

No Glitch on Power-Up

output acts as an AND of the four interrupt inputs.

•

Supports Hot Insertion

An

active-low

reset

(RESET)

input

allows

the

•

Low Standby Current

PCA9545A to recover from a situation in which one of

•

Operating Power-Supply Voltage Range of

2.3 V to 5.5 V

causes all the channels to be deselected, as does the

•

5.5 V Tolerant Inputs

internal power-on reset function.

•

0 to 400-kHz Clock Frequency

The pass gates of the switches are constructed such

•

Latch-Up Performance Exceeds 100 mA per

that the VCC terminal can be used to limit the

JESD 78

maximum high voltage, which will be passed by the

•

ESD Protection Exceeds JESD 22

PCA9545A. This allows the use of different bus

voltages on each pair, so that 1.8-V, 2.5-V, or 3.3-V

–

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

parts can communicate with 5-V parts, without any

–

1000-V Charged-Device Model (C101)

additional protection. External pull-up resistors pull

the bus up to the desired voltage level for each

channel. All I/O terminals are 5.5 V tolerant.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

PCA9545A

TSSOP (20)

6.50 mm x 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.