1

FEATURES

RGVPACKAGE

(TOP VIEW)

5

6

7

8

9

10

11

12

13

14

15

16

1

2

3

4

A1

A2

P0

A0

P4

P7

P6

P5

D,DB,DGV,ORPWPACKAGE

(TOP VIEW)

5

6

7

8

9

10

11

12

13

14

15

16

1

2

3

4

P1

A1

A2

P0

A0

GND

SCL

SDA

V

CC

P4

P7

RESET

P3

P6

P2

P5

RGYPACKAGE

(TOP VIEW)

5

6

7

10

11

12

13

14

15

16

1

2

3

4

SDA

A1

A2

P0

A0

P1

8

9

P4

P7

RESET

P6

P3

P5

DESCRIPTION/ORDERING INFORMATION

PCA9557

WITH RESET AND CONFIGURATION REGISTERS

• Low Standby Current Consumption of

• Internal Power-On Reset

1

µA Max

• High-Impedance Open Drain on P0

• Power Up With All Channels Configured as

• Operating Power-Supply Voltage Range of

Inputs

2.3 V to 5.5 V

• No Glitch on Power Up

• 5-V Tolerant I/O Ports

• Noise Filter on SCL/SDA Inputs

• Latched Outputs With High Current Drive

• Three Hardware Address Pins Allow for Use of

Maximum Capability for Directly Driving LEDs

• Latch-Up Performance Exceeds 100 mA Per

• Lower-Voltage Higher-Performance Migration

JESD 78, Class II

Path for PCA9556

• ESD Protection Exceeds JESD 22

• Input/Output Configuration Register

–

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

• Polarity Inversion Register

–

200-V Machine Model (A115-A)

• Active-Low Reset Input

–

1000-V Charged-Device Model (C101)

[serial clock (SCL) and serial data (SDA)].

The PCA9557 consists of one 8-bit configuration (input or output selection), input port, output port, and polarity

inversion (active-high) registers. At power on, the I/Os are configured as inputs. However, the system master can

enable the I/Os as either inputs or outputs by writing to the I/O configuration bits. The data for each input or

output is kept in the corresponding input or output register. The polarity of the input port register can be inverted

with the polarity inversion register. All registers can be read by the system master.

The device outputs (latched) have high-current drive capability for directly driving LEDs. The device has low

current consumption.

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 © 2005–2008, 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.