PCF8574 Status: ACTIVE

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

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Datasheet

Remote 8-Bit I/O Expander for I2C Bus (Rev. G) (PDF 1090 KB) 11697 views
02 May 2008

	PCF8574
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, 16QFN, 16SOIC, 20QFN, 20TSSOP, 20TVSOP
Operating Temp Range(Celsius)	-40 to 85
Max Frequency(kHz)	100
I2C Address	0100 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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SN65LVDS1: Single LVDS Transmitter

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 PCF8574 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 PCF8574 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 PCF8574 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
PCF8574DGVR	ACTIVE	-40 to 85	1.15 \| 1ku	TVSOP (DGV) \| 20		2000 \| LARGE T&R
PCF8574DGVRE4	ACTIVE	-40 to 85	1.15 \| 1ku	TVSOP (DGV) \| 20		2000 \| LARGE T&R
PCF8574DGVRG4	ACTIVE	-40 to 85	1.15 \| 1ku	TVSOP (DGV) \| 20		2000 \| LARGE T&R
PCF8574DW	ACTIVE	-40 to 85	1.25 \| 1ku	SOIC (DW) \| 16	View	40 \| TUBE	Purchase Samples
PCF8574DWE4	ACTIVE	-40 to 85	1.25 \| 1ku	SOIC (DW) \| 16	View	40 \| TUBE		Purchase Samples
PCF8574DWG4	ACTIVE	-40 to 85	1.25 \| 1ku	SOIC (DW) \| 16	View	40 \| TUBE	Purchase Samples
PCF8574DWR	ACTIVE	-40 to 85	1.15 \| 1ku	SOIC (DW) \| 16	View	2000 \| LARGE T&R
PCF8574DWRE4	ACTIVE	-40 to 85	1.15 \| 1ku	SOIC (DW) \| 16	View	2000 \| LARGE T&R
PCF8574DWRG4	ACTIVE	-40 to 85	1.15 \| 1ku	SOIC (DW) \| 16	View	2000 \| LARGE T&R
PCF8574N	ACTIVE	-40 to 85	1.15 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE
PCF8574NE4	ACTIVE	-40 to 85	1.15 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE
PCF8574PW	ACTIVE	-40 to 85	1.25 \| 1ku	TSSOP (PW) \| 20	View	70 \| TUBE		Purchase Samples
PCF8574PWE4	ACTIVE	-40 to 85	1.25 \| 1ku	TSSOP (PW) \| 20	View	70 \| TUBE		Purchase Samples
PCF8574PWG4	ACTIVE	-40 to 85	1.25 \| 1ku	TSSOP (PW) \| 20	View	70 \| TUBE	Purchase Samples
PCF8574PWR	ACTIVE	-40 to 85	1.15 \| 1ku	TSSOP (PW) \| 20	View	2000 \| LARGE T&R
PCF8574PWRE4	ACTIVE	-40 to 85	1.15 \| 1ku	TSSOP (PW) \| 20	View	2000 \| LARGE T&R
PCF8574PWRG4	ACTIVE	-40 to 85	1.15 \| 1ku	TSSOP (PW) \| 20	View	2000 \| LARGE T&R
PCF8574RGTR	ACTIVE	-40 to 85	1.15 \| 1ku	QFN (RGT) \| 16	View	3000 \| LARGE T&R
PCF8574RGTRG4	ACTIVE	-40 to 85	1.15 \| 1ku	QFN (RGT) \| 16	View	3000 \| LARGE T&R
PCF8574RGYR	ACTIVE	-40 to 85	1.15 \| 1ku	QFN (RGY) \| 20		1000 \| LARGE T&R
PCF8574RGYRG4	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
PCF8574DGVR	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	390
				Rochester Electronics	>1k
			Europe	Avnet-SILICA	>1k
PCF8574DGVRE4	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
PCF8574DGVRG4	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
PCF8574DW	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	620
				Avnet	>1k
				DigiKey	Available
				Mouser Electronics	370
				Rochester Electronics	>1k
			Asia	WPI	87
			Europe	Abacus Polar	440
				Arrow Northern Europe	688
				Avnet-SILICA	>1k
				EBV Elektronik	>1k
				Spoerle	80
PCF8574DWE4	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
PCF8574DWG4	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
PCF8574DWR	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
	4 Weeks		Americas	Arrow	>1k
				Avnet	>1k
				DigiKey	>1k
				Mouser Electronics	>1k
				Rochester Electronics	>1k
			Asia	WPI	>1k
			Europe	Avnet-SILICA	>1k
			Europe	EBV Elektronik	1k
PCF8574DWRE4	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
	4 Weeks		Americas	DigiKey	Available
PCF8574DWRG4	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
	4 Weeks		Americas	DigiKey	Available
PCF8574N	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	45
				Avnet	561
				DigiKey	>1k
				Mouser Electronics	415
				Newark	645
				Rochester Electronics	>1k
			Asia	WPI	66
			Europe	Avnet-SILICA	>1k
			Europe	Compel	308
PCF8574NE4	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
PCF8574PW	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	Avnet	280
			DigiKey	Available
			Mouser Electronics	165
		Asia	WPI	167
		Europe	Abacus Polar	560
			Avnet-SILICA	460
			EBV Elektronik	19
PCF8574PWE4	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
PCF8574PWG4	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
PCF8574PWR	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
	9 Weeks	Americas	Arrow	>1k
			DigiKey	>1k
			Mouser Electronics	853
			Rochester Electronics	>1k
		Asia	WPI	>1k
		Asia	Wintech	>1k
		Europe	Avnet-SILICA	>1k
PCF8574PWRE4	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
	9 Weeks	Americas	DigiKey	Available
PCF8574PWRG4	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
	9 Weeks	Americas	DigiKey	Available
PCF8574RGTR	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	>1k
		Americas	Mouser Electronics	>1k
		Asia	WPI	>1k
PCF8574RGTRG4	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
PCF8574RGYR	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
	15 Weeks	Americas	DigiKey	>1k
		Americas	Mouser Electronics	950
		Asia	WPI	>1k
PCF8574RGYRG4	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
	15 Weeks	Americas	DigiKey	Available
	15 Weeks	Americas	Mouser Electronics	1k
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
PCF8574DGVR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574DGVRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574DGVRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574DW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574DWE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574DWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574DWR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574DWRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574DWRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574N	Pb-Free (RoHS)	CU NIPDAU	N/A for Pkg Type	View	View
PCF8574NE4	Pb-Free (RoHS)	CU NIPDAU	N/A for Pkg Type	View	View
PCF8574PW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574PWE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574PWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574PWR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574PWRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574PWRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574RGTR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574RGTRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8574RGYR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
PCF8574RGYRG4	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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PCF8574 Status: ACTIVE

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

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