PCF8574P

Remote 8-bit I/O expander for I2C-bus


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The PCF8574 is a silicon CMOS circuit. It provides general purpose remote I/O expansion for most microcontroller families via the two-line bidirectional bus (I²C-bus).

The device consists of an 8-bit quasi-bidirectional port and an I²C-bus interface. The PCF8574 has a low current consumption and includes latched outputs with high current drive capability for directly driving LEDs. It also possesses an interrupt line (INT) which can be connected to the interrupt logic of the microcontroller. By sending an interrupt signal on this line, the remote I/O can inform the microcontroller if there is incoming data on its ports without having to communicate via the I²C-bus. This means that the PCF8574 can remain a simple slave device.

The PCF8574 and PCF8574A versions differ only in their slave address as shown in Fig.10.

Features and benefits

  • Operating supply voltage 2.5 to 6 V
  • Low standby current consumption of 10 uA maximum
  • I²C-bus to parallel port expander
  • Open-drain interrupt output
  • 8-bit remote I/O port for the I²C-bus
  • Compatible with most microcontrollers
  • Latched outputs with high current drive capability for directly driving LEDs
  • Address by 3 hardware address pins for use of up to 8 devices (up to 16 with PCF8574A)
  • DIP16, or space-saving SO16 or SSOP20 packages.

Applications

All information on this product information page is subject to the subsequent disclaimers:
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Show functional diagram

Block diagram: PCF8574AP, PCF8574AT, PCF8574ATS, PCF8574P, PCF8574T, PCF8574TS
Block diagram: PCF8574AP, PCF8574AT, PCF8574ATS, PCF8574P, PCF8574T, PCF8574TS

Parametrics of this product

Type numberPackageSource Current per bit(mA)Weak Pull-Up Current Source Max Sink Current per bit(mA)Operating voltage(VDC)I²C-bus(kHz)Operating
temp.(Cel)
# of Addresses# of BitsINTERRUPTMax Sink Current
per package(mA)
PCF8574PSOT38-4
(DIP16)
0.1yes202.5~6.0100-40~8588yes100

Products / Packages

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarking
PCF8574PPCF8574P,1129337 060 60112Volume productionSOT38-4
(DIP16)
Bulk PackStandard Marking

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHSLeadfree conversion dateRHFIFR (FIT)MTBF (hours)MSLMSL LF
PCF8574PPCF8574P,112PCF8574PAlways Pb-free
Quality and reliability disclaimer

Quality and reliability disclaimer

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Documentation for this product

TypeFormatTitleDate
Data sheetpdfRemote 8-bit I/O expander for I2C-bus (v.4.0)2002-11-22
Application notepdfLevel shifting techniques in I2C-bus design (v.1.0)2007-06-20
Application notepdfPCA9500/PCA9501 provides simple card maintenance and control using I²C-bus (v.2.0)2009-03-23
Application notepdfI2C/SMBus general purpose I/O expanders (v.2.0)2005-01-20
Application notepdfI2C manual (v.1.0)2003-03-27
Application notepdfP83CE258 for High-End RDS/EON Car Radio System CCR520S V2.5 (v.1.0)1996-02-01
Application notepdfUART/SPI/I2C code examples (v.1.0)2005-04-12
Application notepdfHigh-end RDS/EON car radio system CCR612 user manual (v.1.0)2003-03-14
Application notepdfA guide to designing for ESD and EMC (v.2.0)2010-01-22
BrochurepdfCreate smarter, more efficient white goods; An industry-leading portfolio of cost-effective, power-saving solutions for major home appliances (v.1.0)2008-06-01
LeafletpdfLow-power GPIO expanders for portable applications; NXP 8/16-bit I2C/SMBus GPIO expanders PCA9534/35/35C for low-power applications (v.1.0)2007-06-01
LeafletpdfVersatile, easy-to-use GPIO expanders; NXP 4/8/16-bit I2C/SMBus GPIO expanders PCA9536/54/54A/55 (v.1.0)2008-08-01
LeafletpdfCombination GPIO expanders and EEPROMs for smaller boards; NXP 8-bit I2C/SMBus GPIO expanders with 2-K EEPROM PCA9500/01 (v.1.0)2007-06-01
LeafletpdfI2C Selection Guide 2H 2011 (v.1.0)2011-09-29
Other typepdfDesignCon 2003 TecForum I 2 C Bus Overview (v.1.0)2003-01-27
Other typepdfApplication guide: Set-top boxes (STBs) (v.1.0)2011-11-28
User manualpdfI2C-bus specification and user manual (v.4.0)2007-06-26
User manualpdfI2C Demonstration Board 2005-1 Quick Start Guide (v.1.0)2006-06-13
User manualpdfPCA9698 demonstration board OM6281 (v.1.0)2008-09-26

Ordering & availability

Type numberOrdering code(12NC)Orderable part numberRegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
PCF8574P9337 060 60112PCF8574P,112NAWPG AMERICAS INC.11,7505/24/2012Buy online 
   EUAVNET EXPRESS EUROPE10,9755/24/2012Buy online 
   ASIAWPI4,575100005/14/2012Buy online 
   NAARROW ELECTRONICS3,7335/24/2012Buy online 
   NAMOUSER ELECTRONICS3,4355/24/2012Buy online 
   NAMOUSER ELECTRONICS3,4355/24/2012Buy online 
   NADIGI-KEY CORPORATION2,3975/24/2012Buy online 
   NANEWARK/ELEMENT147865/24/2012Buy online 
   NAAVNET EXPRESS6735/24/2012Buy online 
   NAFUTURE ELECTRONICS4775/23/2012Buy online 
   EUFUTURE ELECTRONICS UK4775/23/2012Buy online 
   ASIAFUTURE ELECTRONICS- ASIA4775/23/2012Buy online 
   ASIAELEMENT14 APAC2455/24/2012Buy online 
   EUFARNELL1165/24/2012Buy online 
   JAPANCHIP ONE STOPyes05/14/2012Buy online 

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