PCF8574AP

Remote 8-bit I/O expander for I²C‑bus with interrupt

Devices listed on this page should not be used for new designs!
This product has been discontinued. Click here for discontinuation information.


The PCF8574/74A provides general-purpose remote I/O expansion via the two-wire bidirectional I²C‑bus (serial clock (SCL), serial data (SDA)).

The devices consist of eight quasi-bidirectional ports, 100 kHz I²C‑bus interface, three hardware address inputs and interrupt output operating between 2.5 V and 6 V. The quasi-bidirectional port can be independently assigned as an input to monitor interrupt status or keypads, or as an output to activate indicator devices such as LEDs. System master can read from the input port or write to the output port through a single register.

The low current consumption of 2.5 μA (typical, static) is great for mobile applications and the latched output ports directly drive LEDs.

The PCF8574 and PCF8574A are identical, except for the different fixed portion of the slave address. The three hardware address pins allow eight of each device to be on the same I²C‑bus, so there can be up to 16 of these I/O expanders PCF8574/74A together on the same I²C‑bus, supporting up to 128 I/Os (for example, 128 LEDs).

The active LOW open-drain interrupt output (INT) can be connected to the interrupt logic of the microcontroller and is activated when any input state differs from its corresponding input port register state. It is used to indicate to the microcontroller that an input state has changed and the device needs to be interrogated without the microcontroller continuously polling the input register via the I²C‑bus.

The internal Power-On Reset (POR) initializes the I/Os as inputs with a weak internal pull-up 100 μA current source.

Features and benefits

  • I²C-bus to parallel port expander
  • 100 kHz I²C‑bus interface (Standard-mode I²C-bus)
  • Operating supply voltage 2.5 V to 6 V with non-overvoltage tolerant I/O held to VDD with 100 μA current source
  • 8-bit remote I/O pins that default to inputs at power-up
  • Latched outputs directly drive LEDs
  • Total package sink capability of 80 mA
  • Active LOW open-drain interrupt output
  • Eight programmable slave addresses using three address pins
  • Low standby current (2.5 μA typical)
  • -40 °C to +85 °C operation
  • 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
  • Packages offered: DIP16, SO16, SSOP20

Applications

  • LED signs and displays
  • Servers
  • Key pads
  • Industrial control
  • Medical equipment
  • PLC
  • Cellular telephones
  • Mobile devices
  • Gaming machines
  • Instrumentation and test measurement
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 numberMax Sink Current per bit (mA)Max Sink Current, per package (mA)Source Current per bit (mA)I2C-bus (kHz)Package namePackage versionOperating Temperature (Cel)# of Addresses
PCF8574AP201000.1100DIP16SOT38-4-40~858

Similar products

Package

All type numbers in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.

Type numberPackageOutline versionReflow-/Wave solderingPackingProduct statusMarkingOrderable part number, (Ordering code (12NC))
PCF8574APDIP16
(SOT38-4)
sot038-4_poBulk PackDiscontinued
Replacement product
PCF8574APPCF8574AP,112
( 9338 516 70112 )

Discontinuation information

Type numberOrdering code (12NC)Last-time buy dateLast-time delivery dateReplacement productDN NoticeStatusComments
PCF8574AP93385167011231-Mar-1430-Jun-14PCF8574AT/3DN NXP-DN_201306022DNFull WithdrawalOnly this variant is discontinued, available in other package(s).

Quality, reliability & chemical content

All type numbers in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.

Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateMSLMSL LF
PCF8574APPCF8574AP,112Not availableAlways Pb-free
Quality and reliability disclaimer

Quality and reliability disclaimer

Important Legal Notice on the product/generic quality information, No Warranty

NXP Semiconductors is providing this data for your convenience only. Please note however that NO WARRANTY, REPRESENTATION, GUARANTEE OR LEGALLY BINDING PRODUCT DESCRIPTION is provided by publishing this informational data, nor does NXP Semiconductors acknowledge or accept any liability related thereto. The documentation and data on NXP Semiconductors products can be found in the data sheets as officially published by NXP Semiconductors. For all purchase of products from NXP Semiconductors the NXP Semiconductors' General Terms and Conditions of Commercial Sale will apply.

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Discontinuation information

Type numberOrdering code (12NC)Last-time buy dateLast-time delivery dateReplacement productDN NoticeStatusComments
PCF8574AP93385167011231-Mar-1430-Jun-14PCF8574AT/3DN NXP-DN_201306022DNFull WithdrawalOnly this variant is discontinued, available in other package(s).

Documentation for this product

File nameTitleTypeFormatDate
PCF8574_PCF8574ARemote 8-bit I/O expander for I2C-bus with interruptData sheetpdf2013-05-27
AN10441Level shifting techniques in I2C-bus designApplication notepdf2007-06-20
AN256PCA9500/PCA9501 provides simple card maintenance and control using I²C-busApplication notepdf2009-03-23
AN469I2C/SMBus general purpose I/O expandersApplication notepdf2005-01-20
AN10216I2C manualApplication notepdf2003-03-27
AN96007P83CE258 for High-End RDS/EON Car Radio System CCR520S V2.5Application notepdf1996-02-01
AN10369UART/SPI/I2C code examplesApplication notepdf2005-04-12
AN96029High-end RDS/EON car radio system CCR612 user manualApplication notepdf2003-03-14
75016543Create smarter, more efficient white goods; An industry-leading portfolio of cost-effective, power-saving solutions for major home appliancesBrochurepdf2008-06-01
75016020Low-power GPIO expanders for portable applications; NXP 8/16-bit I2C/SMBus GPIO expanders PCA9534/35/35C for low-power applicationsLeafletpdf2007-06-01
75016535Versatile, easy-to-use GPIO expanders; NXP 4/8/16-bit I2C/SMBus GPIO expanders PCA9536/54/54A/55Leafletpdf2008-08-01
75016018Combination GPIO expanders and EEPROMs for smaller boards; NXP 8-bit I2C/SMBus GPIO expanders with 2-K EEPROM PCA9500/01Leafletpdf2007-06-01
75017424NXP I2C-bus solutions 2013: Smart, simple solutions for the 12 most common design concernsLeafletpdf2013-05-23
design_con_2003_tecforum_i2c_bus_overviewDesignCon 2003 TecForum I 2 C Bus OverviewOther typepdf2003-01-27
UM10204I2C-bus specification and user manualUser manualpdf2014-04-07
UM10206I2C Demonstration Board 2005-1 Quick Start GuideUser manualpdf2006-06-12
UM10267PCA9698 demonstration board OM6281User manualpdf2008-09-26
UM10204_JAI2C-bus specification and user manualUser manualpdf2013-04-03
sot038-4_poplastic dual in-line package; 16 leads (300 mil)Outline drawingpdf2009-10-08

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