PCA9557

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.

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-bus 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-bus/SMBus
• High-impedance open-drain on IO0
• 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 kHz to 400 kHz clock frequency
• ESD protection exceeds 2000 V HBM per JESD22-A114, 150 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
• Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA
• Three packages offered: SO16, TSSOP16, HVQFN16

Products/packages

Pricing/ordering/availability

Block diagrams/pinning

Design support

Application Notes

AN10216_1; I2C manual (2003-03-27)

AN10216_1; I2C manual (2003-03-27)

AN10216_1; I2C manual (2003-03-27)

AN469_2; I2C/SMBus general purpose I/O expanders (2005-01-20)

AN10441_1; Level shifting techniques in I2C-bus design (2007-06-20)

AN256_2; PCA9500/PCA9501 provides simple card maintenance and control using I (2009-03-23)

AN256_2; PCA9500/PCA9501 provides simple card maintenance and control using I (2009-03-23)

AN262_2; PCA954X FAMILY OF I²C / SMBus MULTIPLEXERS and SWITCHES (2004-10-01)

Support Documents

75016543; An industry-leading portfolio of cost-effective, power-saving solutions for major home appliances (2008-06-01)

design_con_2003_tecforum_i2c_bus_overview; DesignCon 2003 TecForum I 2 C Bus Overview (2003-01-27)

UM10206_1; I2C Demonstration Board 2005-1 Quick Start Guide (2006-06-13)

i2c_overview_2h_2003; I2C Overview 2H 2003 ()

39340011_21; I2C-bus specification (version 2.1) (2000-01-01)

UM10204_3; I2C-bus specification and user manual (2007-06-26)

web; IBIS and HSPICE Model ()

75016534; NXP octal SMBus registered interface PCA9557 (2008-08-01)

UM10267_1; PCA9698 demonstration board OM6281 (2008-09-26)

Parametrics/similar products

Similar products
PCA9557 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.

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