PCF8574

General description

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

• 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.

Products/packages

Pricing/ordering/availability

Applications

Block diagrams/pinning

Design support

Application Notes

AN96018_1; Application and Product Description of the 16:9 Compressor SAA4981/T (2003-08-28)

AN96029_1; High-end RDS/EON car radio system CCR612 user manual (2003-03-14)

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)

AN96007_1; P83CE258 for High-End RDS/EON Car Radio System CCR520S V2.5 (1996-02-01)

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)

AN10369_1; UART/SPI/I2C code examples (2005-04-12)

AN10369_1; UART/SPI/I2C code examples (2005-04-12)

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)

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

web; IBIS and HSPICE Model ()

75016535; NXP 4/8/16-bit I (2008-08-01)

75016018; NXP 8-bit I2C/SMBus GPIO expanders with 2-K EEPROM PCA9500/01 (2007-06-01)

75016020; NXP 8/16-bit I2C/SMBus GPIO expanders PCA9534/35/35C for low-power applications (2007-06-01)

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

Parametrics/similar products

Similar products
PCF8574 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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