PCA9557D datasheet(2/16 Pages) PHILIPS

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Philips Semiconductors

Product data

PCA9557

8-bit I2C and SMBus I/0 port with reset

2001 Dec 12

853-2308 27449

FEATURES

• Lower voltage, higher performance migration path for the

PCA9556

• 8 general purpose input/output expander/collector

• Input/output configuration register

• Active HIGH polarity inversion register

• I2C and SMBus interface logic

• Internal power-on reset

• Noise filter on SCL/SDA inputs

• Active LOW reset input

• 3 address pins allowing up to 8 devices on the I2C/SMBus

• High impedance open drain on I/O0

• No glitch on power-up

• Power-up with all channels configured as inputs

• Low standby current

• Operating power supply voltage range of 2.3 V to 5.5 V

• 5 V tolerant inputs/outputs

• 0 to 400 kHz clock frequency

• ESD protection exceeds 2000 V HBM per JESD22-A114,

200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101

• Latch-up testing is done to JESDEC Standard JESD78 which

exceeds 100 mA

• Package offer: SO 16, TSSOP 16

DESCRIPTION

The PCA9557 is a silicon CMOS circuit which provides parallel

input/output expansion for SMBus and I2C applications. The

PCA9557 consists of an 8-bit input port register, 8-bit output port

consumption and a high impedance open drain output pin, I/O0.

The system master can enable the PCA9557’s I/O as either input or

output by writing to the configuration register.

The system master can also invert the PCA9557 inputs by writing to

the active HIGH polarity inversion register.

Finally, the system master can reset the PCA9557 in the event of a

timeout by asserting a LOW in the reset input.

The power-on reset puts the registers in their default state and

initializes the I2C/SMBus state machine. The RESET pin causes the

same reset/initialization to occur without depowering the part.

PIN CONFIGURATION

su01045

SCL

SDA

I/O0

I/O1

VSS

VDD

RESET

I/O7

I/O6

I/O5

I/O4

I/O3

I/O2

Figure 1. Pin configuration

PIN DESCRIPTION

NUMBER

SYMBOL

FUNCTION

SCL

Serial clock line

SDA

Serial data line

Address input 0

Address input 1

Address input 2

I/O0

I/O0 (open drain)

I/O1

VSS

Supply ground

I/O2

I/O3

I/O4

I/O5

I/O6

I/O7

RESET

Active low reset input

VDD

Supply voltage

ORDERING INFORMATION

PACKAGES

TEMPERATURE RANGE

ORDER CODE

DRAWING NUMBER

16-Pin Plastic SO (narrow)

–40 to +85

°C

PCA9557D

SOT109-1

16-Pin Plastic TSSOP

–40 to +85

°C

PCA9557PW

SOT403-1

Standard packing quantities and other packaging data is available at www.philipslogic.com/packaging.

SMBus as specified by the Smart Battery System Implementers Forum is a derivative of the Philips I2C patent.

I2C is a trademark of Philips Semiconductors Corporation.

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