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, 200 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

Applications

Related applications
Digital media adapters
LCD display - discretes focus
PDA - discretes focus
Motherboard components
50-60 Hz CRT integrated DTV (TV210D)
Mid-range integrated DTV (TV810)
Intelligent washing machine
PCI analog/DVB-T stereo TV receiver
Nexperia UMA-enabled GSM/GPRS/EDGE VAS system solution (6100)
Cellular phone - MMS functionality
LCD TV - MMS functionality
Set-top box - MMS functionality

Block diagrams/pinning

Technical documents

Application Notes

AN10216_1; I2C manual (27-Mar-03)

AN10441_1; Level shifting techniques in I2C-bus design (20-Jun-07)

AN262_2; PCA954X FAMILY OF I²C / SMBus MULTIPLEXERS and SWITCHES (01-Oct-04)

AN469_2; I2C/SMBus general purpose I/O expanders (20-Jan-05)

Support Documents

75015669; Continuous innovation. Timeless lifespan. (01-Sep-06)

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

75013239; I 2 C Logic Selection Guide (2005-01-12)

75011212; I2C 2002-1A Evaluation Board Kit (01-Mar-03)

75012744; I2C Bus Solutions 2004 (2004-02-01)

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

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 (26-Jun-07)

pca9557; IBIS model of PCA9557 8-bit I2C and SMBus I/O port with reset SO 16-pin Package and TSSOP 16-pin Package (2002-03-18)

75016022; NXP 8/16-bit I2C/SMBus GPIO expanders PCA9554/54A/55 (2007-06-01)

75010197; PCA9534/9535 I/O Expanders (2002-08-01)

75014395; Your connection to I 2 C,UART,CAN,and USB Connecting with Philips Wired Connectivity (2005-04-01)

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.

Print / Email

• Print this information
• Email this information

Disclaimer

The information published on product information pages of the www.nxp.com or www.semiconductors.com websites is an extract from product data sheets and is for information purposes only. For detailed information please check the most recent version of the relevant product data sheet as published on these websites. In the event of any conflict between product information pages and data sheets or deviations from information provided in the product data sheets on these product information pages, the information provided in the product data sheets shall prevail.

The product status of the product(s) described in the product data sheet may have changed since publication of the data sheet and therefore information in datasheets on product status may be outdated. The latest information on product status is published on the product information pages of the above-mentioned websites.

As from October 1st, 2006 Philips Semiconductors has a new trade name - NXP Semiconductors, which will be used in future data sheets together with new contact details. In data sheets where the previous Philips references remain, please use the new links as shown below.

http://www.philips.semiconductors.com use http://www.nxp.com

http://www.semiconductors.philips.com use http://www.nxp.com (Internet)

sales.addresses@www.semiconductors.philips.com use salesaddresses@nxp.com (e-mail)

The copyright notice at the bottom of each page (or elsewhere in the document, depending on the version)
- © Koninklijke Philips Electronics N.V. (year). All rights reserved -
is replaced with:
- © NXP B.V. (year). All rights reserved.-

If you have any questions related to the data sheet, please contact our nearest sales office via e-mail or phone (details via salesaddresses@nxp.com). Thank you for your cooperation and understanding.