8-Bit I²C-Bus and SMBus I/O Port with Reset

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Products
Interfaces
I²C, SPI, I3C Interface Devices
General Purpose I/O (GPIO)
- PCA6408A
- PCA6416A
- PCA8574/74A
- PCA8575
- PCA9500
- PCA9501
- PCA9502BS
- PCA9505/06
- PCA9534
- PCA9535A
- PCA9535_PCA9535C
- PCA9536
- PCA9537DP
- PCA9538
- PCA9538A
- PCA9539A
- PCA9539_PCA9539R
- PCA9554B_PCA9554C
- PCA9554_PCA9554A
- PCA9555
- PCA9555A
- PCA9557
- PCA9570
- PCA9574
- PCA9575
- PCA9670BS
- PCA9670PW
- PCA9671
- PCA9672
- PCA9673
- PCA9674_PCA9674A
- PCA9675
- PCA9698
- PCA9701_PCA9702
- PCA9703
- PCA9704PW
- PCAL6408A
- PCAL6416A
- PCAL6416AEX
- PCAL6524
- PCAL6534
- PCAL9535A
- PCAL9538A
- PCAL9539A
- PCAL9554B; PCAL9554C
- PCAL9555A
- PCAL9714
- PCAL9722
- PCF8574/74A
- PCF8575
PCA9557

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 controller can enable the PCA9557's I/O as either input or output by writing to the configuration register. The system controller can also invert the PCA9557 inputs by writing to the active HIGH polarity inversion register. Finally, the system controller 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.

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Data Sheet

Application Notes

Product Details

Block Diagram

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PCA9557

PCA9557BS, PCA9557D, PCA9557PW

PCA9557BS, PCA9557D, PCA9557PW

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Features

Key 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 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

Part numbers include: PCA9557BS, PCA9557D, PCA9557PW.

Buy/Parametrics

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Documentation

Quick reference to our documentation types.

1-5 of 17 documents

^{Data Sheet}
8-bit I2C-bus and SMBus I/O port with reset

PDFRev 7.0Dec 10, 2013289.1 KBPCA9557English
^{Application Note}
Driving stepper motors using NXP I2C-bus GPIO expanders

PDFRev 2.0Oct 24, 2011281.2 KBAN10814English
^{Application Note}
AN256: PCA9500/PCA9501 provides simple card maintenance and control using I²C-bus

PDFRev 1.0Mar 23, 200992.3 KBAN256English
Sign in required
^{Application Note}
AN469

PDFRev 2.0Jan 20, 2005301.0 KBAN469English
^{Application Note}
AN262

PDFRev 2.0Oct 1, 2004826.2 KBAN262English
^{Application Note}
AN10216

PDFRev 1.0Mar 27, 20034.3 MBAN10216English
^{User Guide}
I2C-bus specification and user manual

PDFRev 7.0Oct 1, 2021751.0 KBUM10204English, 日本語
^Brochure
Convenient parallel I/O expansion or collection via the I2C/SMBus; NXP Octal SMBus registered interface PCA9557

PDFRev 1.2Aug 1, 2008386.1 KB750_16534English
^{Package Information}
plastic thermal enhanced very thin quad flat package; no leads; 16 terminals; body 4 x 4 x 0.85 mm

PDFRev 1.0Dec 8, 2021191.3 KBSOT629-1English
^{Package Information}
plastic, thin shrink small outline package; 16 leads; 0.65 mm pitch; 5 mm x 4.4 mm x 1.1 mm body

PDFRev 1.2Dec 10, 2019298.1 KBSOT403-1English
^{Packing Information}
HVQFN16; Reel pack; SMD, 13" Q2/T3 Standard product orientation Orderable part number ending ,128 or HP Ordering code (12NC) ending 128

PDFRev 1.0Dec 14, 2015193.2 KBSOT629-1_128English
^{Packing Information}
SO16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118

PDFRev 4.0Apr 24, 2013215.2 KBSOT109-1_118English
^{Packing Information}
HVQFN16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118

PDFRev 1.0Apr 17, 2013264.7 KBSOT629-1_118English
^{Packing Information}
TSSOP16; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118

PDFRev 1.0Apr 8, 2013223.6 KBSOT403-1_118English
^{Training Presentation}
DesignCon 2003 TecForum I²C-Bus Overview

PDFRev 0.1Jan 27, 20034.4 MBDESIGN_CON_2003_TECFORUM_I2C_B_1English
^{Supporting Information}
Footprint for wave soldering

PDFRev 1.0Oct 8, 200916.6 KBSSOP-TSSOP-VSO-WAVEEnglish
^{Supporting Information}
Footprint for Wave Soldering

PDFRev 1.0Oct 8, 20098.3 KBSO-SOJ-WAVEEnglish

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Design Resources

Design Files

Quick reference to our design files types.

5 design files

Receive the full breakdown. See the product footprint and more in the eCad file.

^Models
PCA9557 IBIS model

IBSRev 1.2Sep 11, 2014 00:00:0059.6 KBPCA9557_1
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^{Symbols and Footprints}
PCA9557BS-HVQFN16-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Jun 22, 2020 16:50:0054.4 KBPCA9557BS-HVQFN16-BXL
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^{Symbols and Footprints}
PCA9557D-SO16-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Sep 22, 2020 17:52:0050.4 KBPCA9557D-SO16-BXL
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^{Symbols and Footprints}
PCA9557PW-TSSOP16-CAD Symbol and PCB Footprint – BXL File

ZIPRev 1Sep 22, 2020 17:52:0038.6 KBPCA9557PW-TSSOP16-BXL
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^{Design Files - miscellaneous}
Expert mode sample code for PCA9557

TXTRev 1.0Dec 10, 2014 00:00:002.0 KB8-BIT-PCA9557-TOTEM-POLE-READ-
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Engineering Services

To get further assistance directly from NXP, please see our Engineering Services.

1 engineering service

^{Independent Design House (IDH)}
Embedded Software Design

By TAGnology RFID GmbH GoldHQ: Voitsberg, AustriaSupporting Regions: EMEA

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8-Bit I²C-Bus and SMBus I/O Port with Reset

Product Details

Block Diagram

PCA9557

PCA9557BS, PCA9557D, PCA9557PW

PCA9557BS, PCA9557D, PCA9557PW

Features

Key Features

Buy/Parametrics

Documentation

Filter by

Design Resources

Design Files

Filter by

PCA9557 IBIS model

PCA9557BS-HVQFN16-CAD Symbol and PCB Footprint – BXL File

PCA9557D-SO16-CAD Symbol and PCB Footprint – BXL File

PCA9557PW-TSSOP16-CAD Symbol and PCB Footprint – BXL File

Expert mode sample code for PCA9557

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