1

FEATURES

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

A0

A1

A2

P0

P1

P2

P3

GND

SDA

SCL

INT

P7

P6

P5

P4

DW OR N PACKAGE

(TOP VIEW)

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

INT

SCL

NC

SDA

A0

A1

NC

A2

P0

P7

P6

NC

P5

P4

GND

P3

NC

P2

P1

DGV OR PW PACKAGE

(TOP VIEW)

NC – No internal connection

RGY PACKAGE

(TOP VIEW)

1

20

10

11

2

3

4

5

6

7

8

9

19

18

17

16

15

14

13

12

P6

NC

P5

P4

GND

P3

NC

P2

SCL

NC

SDA

A0

A1

NC

A2

NC – No internal connection

RGT PACKAGE

(TOP VIEW)

1

2

3

4

9

10

11

12

GND

P4

P5

P6

V

CC

A0

A1

A2

DESCRIPTION/ORDERING INFORMATION

PCF8574

• Low Standby-Current Consumption of

• Compatible With Most Microcontrollers

10

µA Max

• Latched Outputs With High-Current Drive

Capability for Directly Driving LEDs

• Open-Drain Interrupt Output

• Latch-Up Performance Exceeds 100 mA Per

JESD 78, Class II

operation.

interface [serial clock (SCL), serial data (SDA)].

The device features an 8-bit quasi-bidirectional I/O port (P0–P7), including latched outputs with high-current drive

capability for directly driving LEDs. Each quasi-bidirectional I/O can be used as an input or output without the use

on when an output is written high and is switched off by the negative edge of SCL. The I/Os should be high

before being used as inputs.

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2001–2008, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.