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.

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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.

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Products/packages

Type number	Orderable part number	Ordering code (12NC)	Product status	Package	Packing	Marking
PCF8574AP	PCF8574AP,112	9338 516 70112	Volume production	SOT38-4 (DIP16)	Bulk Pack	Standard Marking
PCF8574AT/3	PCF8574AT/3,512	9352 755 81512	Volume production	SOT162-1 (SO16)	Tube Dry Pack	Standard Marking
PCF8574AT/3	PCF8574AT/3,518	9352 755 81518	Volume production	SOT162-1 (SO16)	Reel Dry Pack, SMD, 13"	Standard Marking
PCF8574ATS/3	PCF8574ATS/3,118	9352 765 44118	Volume production	SOT266-1 (SSOP20)	Reel Pack, SMD, 13"	Standard Marking
PCF8574P	PCF8574P,112	9337 060 60112	Volume production	SOT38-4 (DIP16)	Bulk Pack	Standard Marking
PCF8574T/3	PCF8574T/3,512	9352 756 17512	Volume production	SOT162-1 (SO16)	Tube Dry Pack	Standard Marking
PCF8574T/3	PCF8574T/3,518	9352 756 17518	Volume production	SOT162-1 (SO16)	Reel Dry Pack, SMD, 13"	Standard Marking
PCF8574TS/3	PCF8574TS/3,118	9352 756 72118	Volume production	SOT266-1 (SSOP20)	Reel Pack, SMD, 13"	Standard Marking
PCF8574TS/3	PCF8574TS/3,112	9352 756 72112	Volume production	SOT266-1 (SSOP20)	Tube	Standard Marking

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Quality/reliability/chemical content

Type number	Orderable part number	Chemical content	Leadfree Conversion date
PCF8574AP	PCF8574AP,112	PCF8574AP	Always Pb-free
PCF8574AT/3	PCF8574AT/3,512	PCF8574AT_3	week 35, 2004
PCF8574AT/3	PCF8574AT/3,518	PCF8574AT_3	week 35, 2004
PCF8574ATS/3	PCF8574ATS/3,118	PCF8574ATS_3	Always Pb-free
PCF8574P	PCF8574P,112	PCF8574P	Always Pb-free
PCF8574T/3	PCF8574T/3,512	PCF8574T_3	Always Pb-free
PCF8574T/3	PCF8574T/3,518	PCF8574T_3	Always Pb-free
PCF8574TS/3	PCF8574TS/3,118	PCF8574TS_3	Always Pb-free
PCF8574TS/3	PCF8574TS/3,112	PCF8574TS_3	Always Pb-free

Quality and reliability disclaimer

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Pricing/ordering/availability

Type number	Ordering code(12NC)	Orderable part number	Indicative price/unit($)	Region	Distributor	In stock	Order quantity	Inventory date	Buy online	Samples
PCF8574AP	9338 516 70112	PCF8574AP,112	2.1300	NA	ARROW ELECTRONICS	2,715		11/6/2009	Buy online	Order samples
				NA	DIGI-KEY CORPORATION	975		11/7/2009	Buy online
				NA	MOUSER ELECTRONICS	943		11/7/2009	Buy online
				NA	FUTURE ELECTRONICS	1,758		11/7/2009	Buy online
				NA	AVNET ELECTRONICS MARKETING	1,226		11/7/2009	Buy online
PCF8574AT/3	9352 755 81512	PCF8574AT/3,512	2.0400	NA	NEWARK	504		11/6/2009	Buy online	not available
				NA	ARROW ELECTRONICS	1,691		11/6/2009	Buy online
				NA	DIGI-KEY CORPORATION	251		11/7/2009	Buy online
				NA	FUTURE ELECTRONICS	7,468		11/7/2009	Buy online
				NA	AVNET ELECTRONICS MARKETING	1,206		11/7/2009	Buy online
PCF8574AT/3	9352 755 81518	PCF8574AT/3,518	2.0400	ASIA	WPI	4,000	1000	11/07/2009	Buy online	Order samples
				NA	MOUSER ELECTRONICS	632		11/7/2009	Buy online
				NA	FUTURE ELECTRONICS	34,438		11/7/2009	Buy online
PCF8574ATS/3	9352 765 44118	PCF8574ATS/3,118	1.3900	NA	DIGI-KEY CORPORATION	6,409		11/7/2009	Buy online	Order samples
				NA	MOUSER ELECTRONICS	1,581		11/7/2009	Buy online
				NA	FUTURE ELECTRONICS	15,000		11/7/2009	Buy online
				NA	AVNET ELECTRONICS MARKETING	2,375		11/7/2009	Buy online
PCF8574P	9337 060 60112	PCF8574P,112	2.1300	NA	NEWARK	389		11/6/2009	Buy online	Order samples
				NA	ARROW ELECTRONICS	3,506		11/6/2009	Buy online
				NA	DIGI-KEY CORPORATION	395		11/7/2009	Buy online
				NA	MOUSER ELECTRONICS	570		11/7/2009	Buy online
				NA	FUTURE ELECTRONICS	4,577		11/7/2009	Buy online
				NA	AVNET ELECTRONICS MARKETING	1,820		11/7/2009	Buy online
PCF8574T/3	9352 756 17512	PCF8574T/3,512	2.0400	NA	NEWARK	31		11/6/2009	Buy online	not available
				NA	MOUSER ELECTRONICS	404		11/7/2009	Buy online
				NA	ARROW ELECTRONICS	584		11/6/2009	Buy online
				NA	DIGI-KEY CORPORATION	1,969		11/7/2009	Buy online
				NA	FUTURE ELECTRONICS	7,108		11/7/2009	Buy online
				NA	AVNET ELECTRONICS MARKETING	441		11/7/2009	Buy online
PCF8574T/3	9352 756 17518	PCF8574T/3,518	2.0400	NA	ARROW ELECTRONICS	8,000		11/6/2009	Buy online	Order samples
				ASIA	SAC - Taiwan	yes	1000	11/08/2009	Buy online
				ASIA	SACL - Hong Kong/China	yes	1000	11/08/2009	Buy online
				ASIA	WPI	10,000	1000	11/07/2009	Buy online
				NA	DIGI-KEY CORPORATION	2,078		11/7/2009	Buy online
				NA	FUTURE ELECTRONICS	3,180		11/7/2009	Buy online
PCF8574TS/3	9352 756 72118	PCF8574TS/3,118	2.1100	ASIA	SAC - Taiwan	yes	2500	11/08/2009	Buy online	Order samples
				ASIA	SACL - Hong Kong/China	yes	2500	11/08/2009	Buy online
				ASIA	WPI	25,000	2500	11/07/2009	Buy online
				NA	DIGI-KEY CORPORATION	3,791		11/7/2009	Buy online
				NA	MOUSER ELECTRONICS	437		11/7/2009	Buy online
PCF8574TS/3	9352 756 72112	PCF8574TS/3,112	2.1100	NA	DIGI-KEY CORPORATION	4,810		11/7/2009	Buy online	not available
				NA	FUTURE ELECTRONICS	5,049		11/7/2009	Buy online
				NA	AVNET ELECTRONICS MARKETING	1,265		11/7/2009	Buy online

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Applications

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Block diagrams/pinning

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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)

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 I²C-bus (2009-03-23)

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 I²C/SMBus GPIO expanders PCA9536/54/54A/55 (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)

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Parametrics/similar products

Type number	Package	INTERRUPT	Operating temp.(Cel)	# of Bits	Source Current per bit(mA)	I²C-bus(kHz)	Operating voltage(VDC)	Weak Pull-Up Current Source	Max Sink Current per bit(mA)	# of Addresses	Max Sink Current per package(mA)
PCF8574AP	SOT38-4 (DIP16)	0-1	-40~85	8	0.1	100	2.5~6.0	yes	20	4	100
PCF8574AT/3	SOT162-1 (SO16)	0-1	-40~85	8	0.1	100	2.5~6.0	yes	20	4	100
PCF8574ATS/3	SOT266-1 (SSOP20)	0-1	-40~85	8	0.1	100	2.5~6.0	yes	20	8	100
PCF8574P	SOT38-4 (DIP16)	0-1	-40~85	8	0.1	100	2.5~6.0	yes	20	4	100
PCF8574T/3	SOT162-1 (SO16)	0-1	-40~85	8	0.1	100	2.5~6.0	yes	20	4	100
PCF8574TS/3	SOT266-1 (SSOP20)	0-1	-40~85	8	0.1	100	2.5~6.0	yes	20	8	100

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.

Datasheet

PCF8574 - Remote 8-bit I/O expander for I2C-bus

General description

Features

Products/packages

Quality/reliability/chemical content

Pricing/ordering/availability

Applications

Block diagrams/pinning

Design support

Parametrics/similar products

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