PCF8574A Status: ACTIVE

Remote 8-Bit I/O Expander for I2C-Bus

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Datasheet

PCF8574A (Rev. D) (PDF 786 KB) 9635 views
13 Oct 2005

	PCF8574A
Voltage Nodes(V)	5, 3.3
Interrupt Output	Yes
Reset Input	No
Rating	Catalog
fSCLK(Max)(MHz)	0.1
VCC(Min)(V)	2.5
VCC(Max)(V)	6
Pin/Package	16PDIP, 16SOIC, 20QFN, 20TSSOP, 20TVSOP
Operating Temp Range(Celsius)	-40 to 85
Max Frequency(kHz)	100
I2C Address	0111 xxx
# of I/Os	8
Vcc range(V)	2.5 to 6.0
Push–Pull I/O Type	Yes
	Samples
	Inventory

Customers Who Evaluated This Product Also Evaluated

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LMV331: Single General Purpose Low-Voltage Comparator
ADS1256: 24 Bit, 30kSPS Very Low Noise Delta-Sigma ADC with Multiplexer

Product Information

Features

Low Standby-Current Consumption of 10 µA Max
I²C to Parallel-Port Expander
Open-Drain Interrupt Output
Compatible With Most Microcontrollers
Latched Outputs With High-Current Drive Capability for Directly Driving LEDs
Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II

DESCRIPTION/ORDERING INFORMATION

This 8-bit input/output (I/O) expander for the two-line bidirectional bus (I²C) is designed for 2.5-V to 6-V V_CC operation.

The PCF8574A provides general-purpose remote I/O expansion for most microcontroller families via the I²C interface [serial clock (SCL), serial data (SDA)].

The device features an 8-bit quasi-bidirectional I/O port (P0-P7), including latched outputs with high-current drive capability for directly driving LEDs. Each quasi-bidirectional I/O can be used as an input or output without the use of a data-direction control signal. At power on, the I/Os are high. In this mode, only a current source to V_CC is active. An additional strong pullup to V_CC allows fast rising edges into heavily loaded outputs. This device turns on when an output is written high and is switched off by the negative edge of SCL. The I/Os should be high before being used as inputs.

The PCF8574A provides an open-drain output (INT) that can be connected to the interrupt input of a microcontroller. An interrupt is generated by any rising or falling edge of the port inputs in the input mode. After time, t_iv, INT is valid. Resetting and reactivating the interrupt circuit is achieved when data on the port is changed to the original setting or data is read from, or written to, the port that generated the interrupt. Resetting occurs in the read mode at the acknowledge bit after the rising edge of the SCL signal, or in the write mode at the acknowledge bit after the high-to-low transition of the SCL signal. Interrupts that occur during the acknowledge clock pulse can be lost (or be very short) due to the resetting of the interrupt during this pulse. Each change of the I/Os after resetting is detected and, after the next rising clock edge, is transmitted as INT. Reading from, or writing to, another device does not affect the interrupt circuit.

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. Therefore, the PCF8574A can remain a simple slave device.

Pricing / Packaging / CAD Design Tools / Samples

			Price	Packaging			CAD Design Tools		Samples
Device	Status	Temp (^oC)	Price \| Quantity	Package \| Pins	Top Side Marking	Package QTY \| Package Carrier	Symbols	Footprints	Samples
PCF8574ADGVR	ACTIVE	-40 to 85	1.15 \| 1ku	TVSOP (DGV) \| 20		2000 \| LARGE T&R
PCF8574ADGVRE4	ACTIVE	-40 to 85	1.15 \| 1ku	TVSOP (DGV) \| 20		2000 \| LARGE T&R
PCF8574ADGVRG4	ACTIVE	-40 to 85	1.15 \| 1ku	TVSOP (DGV) \| 20		2000 \| LARGE T&R
PCF8574ADW	ACTIVE	-40 to 85	1.25 \| 1ku	SOIC (DW) \| 16	View	40 \| TUBE		Purchase Samples
PCF8574ADWE4	ACTIVE	-40 to 85	1.25 \| 1ku	SOIC (DW) \| 16	View	40 \| TUBE		Purchase Samples
PCF8574ADWG4	ACTIVE	-40 to 85	1.25 \| 1ku	SOIC (DW) \| 16	View	40 \| TUBE		Purchase Samples
PCF8574ADWR	ACTIVE	-40 to 85	1.15 \| 1ku	SOIC (DW) \| 16	View	2000 \| LARGE T&R
PCF8574ADWRE4	ACTIVE	-40 to 85	1.15 \| 1ku	SOIC (DW) \| 16	View	2000 \| LARGE T&R
PCF8574ADWRG4	ACTIVE	-40 to 85	1.15 \| 1ku	SOIC (DW) \| 16	View	2000 \| LARGE T&R
PCF8574AN	ACTIVE	-40 to 85	1.15 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE
PCF8574ANE4	ACTIVE	-40 to 85	1.15 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE
PCF8574APW	ACTIVE	-40 to 85	1.25 \| 1ku	TSSOP (PW) \| 20	View	70 \| TUBE		Purchase Samples
PCF8574APWE4	ACTIVE	-40 to 85	1.25 \| 1ku	TSSOP (PW) \| 20	View	70 \| TUBE		Purchase Samples
PCF8574APWG4	ACTIVE	-40 to 85	1.25 \| 1ku	TSSOP (PW) \| 20	View	70 \| TUBE	Purchase Samples
PCF8574APWR	ACTIVE	-40 to 85	1.15 \| 1ku	TSSOP (PW) \| 20	View	2000 \| LARGE T&R
PCF8574APWRE4	ACTIVE	-40 to 85	1.15 \| 1ku	TSSOP (PW) \| 20	View	2000 \| LARGE T&R
PCF8574APWRG4	ACTIVE	-40 to 85	1.15 \| 1ku	TSSOP (PW) \| 20	View	2000 \| LARGE T&R
PCF8574ARGYR	ACTIVE	-40 to 85	1.15 \| 1ku	QFN (RGY) \| 20		1000 \| LARGE T&R
PCF8574ARGYRG4	ACTIVE	-40 to 85	1.15 \| 1ku	QFN (RGY) \| 20		1000 \| LARGE T&R

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

	TI Inventory Status		Reported Distributor Inventory
PCF8574ADGVR	As of 11:08 AM GMT, 03 Jul 2009		As of 11:08 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	6 Weeks		Americas	DigiKey	>1k
				Mouser Electronics	>1k
				Rochester Electronics	>1k
			Asia	WPI	>1k
			Europe	Avnet-SILICA	>1k
PCF8574ADGVRE4	As of 11:08 AM GMT, 03 Jul 2009		As of 11:08 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	6 Weeks		Americas	DigiKey	Available
PCF8574ADGVRG4	As of 11:08 AM GMT, 03 Jul 2009		As of 11:08 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	6 Weeks		Americas	DigiKey	Available
PCF8574ADW	As of 11:08 AM GMT, 03 Jul 2009		As of 11:08 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	5 Weeks		Americas	Arrow	104
				Avnet	838
				DigiKey	Available
				Mouser Electronics	730
				Newark	186
				Rochester Electronics	>1k
			Asia	WPI	279
			Europe	Abacus Polar	160
				Avnet-SILICA	>1k
				Spoerle	280
PCF8574ADWE4	As of 11:08 AM GMT, 03 Jul 2009		As of 11:08 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	5 Weeks		Americas	DigiKey	Available
PCF8574ADWG4	As of 11:08 AM GMT, 03 Jul 2009		As of 11:08 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	5 Weeks		Americas	Avnet	300
			Americas	DigiKey	Available
			Europe	EBV Elektronik	240
PCF8574ADWR	As of 11:08 AM GMT, 03 Jul 2009		As of 11:08 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	5 Weeks		Americas	Arrow	>1k
				Avnet	>1k
				DigiKey	>1k
				Mouser Electronics	>1k
				Rochester Electronics	>1k
			Asia	WPI	>1k
			Asia	Wintech	>1k
			Europe	Avnet-SILICA	>1k
PCF8574ADWRE4	As of 11:08 AM GMT, 03 Jul 2009		As of 11:08 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	5 Weeks		Americas	DigiKey	Available
PCF8574ADWRG4	As of 11:08 AM GMT, 03 Jul 2009		As of 11:08 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	5 Weeks		Americas	DigiKey	Available
PCF8574AN	As of 11:08 AM GMT, 03 Jul 2009		As of 11:08 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	5 Weeks		Americas	Arrow	370
				DigiKey	>1k
				Mouser Electronics	24
				Newark	338
				Rochester Electronics	>1k
			Asia	WPI	72
			Europe	Avnet-SILICA	300
			Europe	EBV Elektronik	25
PCF8574ANE4	As of 11:08 AM GMT, 03 Jul 2009		As of 11:08 AM GMT, 03 Jul 2009
	Lead Time		Region	Company	In Stock	Purchase
	5 Weeks		Americas	DigiKey	Available
	5 Weeks		Americas	Mouser Electronics	306
PCF8574APW	As of 11:08 AM GMT, 03 Jul 2009	As of 11:08 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	10 Weeks	Americas	DigiKey	Available
		Americas	Mouser Electronics	293
		Europe	Avnet-SILICA	5
PCF8574APWE4	As of 11:08 AM GMT, 03 Jul 2009	As of 11:08 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	10 Weeks	Americas	DigiKey	Available
	10 Weeks	Europe	Arrow Northern Europe	140
PCF8574APWG4	As of 11:08 AM GMT, 03 Jul 2009	As of 11:08 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	10 Weeks	Americas	DigiKey	Available
PCF8574APWR	As of 11:08 AM GMT, 03 Jul 2009	As of 11:08 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	11 Weeks	Americas	DigiKey	560
		Americas	Rochester Electronics	>1k
		Asia	WPI	>1k
		Europe	Avnet-SILICA	>1k
PCF8574APWRE4	As of 11:08 AM GMT, 03 Jul 2009	As of 11:08 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	11 Weeks	Americas	DigiKey	Available
PCF8574APWRG4	As of 11:08 AM GMT, 03 Jul 2009	As of 11:08 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	11 Weeks	Americas	DigiKey	Available
PCF8574ARGYR	As of 11:08 AM GMT, 03 Jul 2009	As of 11:08 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	7 Weeks	Americas	Avnet	1k
			DigiKey	>1k
			Mouser Electronics	600
			Rochester Electronics	>1k
		Asia	WPI	>1k
		Europe	Avnet-SILICA	>1k
PCF8574ARGYRG4	As of 11:08 AM GMT, 03 Jul 2009	As of 11:08 AM GMT, 03 Jul 2009
	Lead Time	Region	Company	In Stock	Purchase
	7 Weeks	Americas	DigiKey	Available
View all Distributors

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

	Product Content				DPPM / MTBF / FIT Rate
Device	Eco Plan*	Lead / Ball Finish	MSL Rating / Peak Reflow	Details	Details
PCF8574ADGVR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574ADGVRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574ADGVRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574ADW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574ADWE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574ADWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574ADWR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574ADWRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574ADWRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574AN	Pb-Free (RoHS)	CU NIPDAU	N/A for Pkg Type	View	View
PCF8574ANE4	Pb-Free (RoHS)	CU NIPDAU	N/A for Pkg Type	View	View
PCF8574APW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574APWE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574APWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574APWR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574APWRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574APWRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574ARGYR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
PCF8574ARGYRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

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Datasheet

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PCF8574A Status: ACTIVE

Remote 8-Bit I/O Expander for I2C-Bus

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