PCA9557 datasheet(1/26 Pages) NXP

Part #	PCA9557

Description	8-bit I2C-bus and SMBus I/O port with reset

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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1.

General description

The PCA9557 is a silicon CMOS circuit which provides parallel input/output expansion for

SMBus and I2C-bus applications. The PCA9557 consists of an 8-bit input port register,

8-bit output port register, and an I2C-bus/SMBus interface. It has low current consumption

and a high-impedance open-drain output pin, IO0.

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 time-out by asserting a LOW in the reset input.

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

I2C-bus/SMBus state machine. The RESET pin causes the same reset/initialization to

occur without de-powering the part.

2.

Features

I Lower voltage, higher performance migration path for the PCA9556

I 8 general purpose input/output expander/collector

I Input/output conﬁguration register

I Active HIGH polarity inversion register

I I2C-bus and SMBus interface logic

I Internal power-on reset

I Noise ﬁlter on SCL/SDA inputs

I Active LOW reset input

I 3 address pins allowing up to 8 devices on the I2C-bus/SMBus

I High-impedance open-drain on IO0

I No glitch on power-up

I Power-up with all channels conﬁgured as inputs

I Low standby current

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

I 5 V tolerant inputs/outputs

I 0 kHz to 400 kHz clock frequency

I ESD protection exceeds 2000 V HBM per JESD22-A114, 150 V MM per

JESD22-A115 and 1000 V CDM per JESD22-C101

I Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

I Three packages offered: SO16, TSSOP16, HVQFN16

PCA9557

8-bit I2C-bus and SMBus I/O port with reset

Rev. 06 — 11 June 2008

Product data sheet

Similar Part No. - PCA9557

Manufacturer	Part #	Datasheet	Description
NXP Semiconductors	PCA9557	127Kb / 16P	8-bit I2C and SMBus I/0 port with reset 2001 Dec 12
Texas Instruments	PCA9557	1,015Kb / 34P	[Old version datasheet] REMOTE 8-BIT I2C AND SMBus LOW-POWER I/O EXPANDER WITH RESET AND CONFIGURATION REGISTERS
Texas Instruments	PCA9557	1Mb / 36P	[Old version datasheet] REMOTE 8-BIT I2C AND SMBus LOW-POWER I/O EXPANDER WITH RESET AND CONFIGURATION REGISTERS
NXP Semiconductors	PCA9557	727Kb / 8P	Smart, simple solutions for the 12 most common design concerns August 2011
NXP Semiconductors	PCA9557D	127Kb / 16P	8-bit I2C and SMBus I/0 port with reset 2001 Dec 12

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