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 1089 KB)
02 May 2008

	PCF8574
Voltage Nodes(V)	5, 3.3
Interrupt Output	Yes
Reset Input	No
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

PCF8574A: Remote 8-Bit I/O Expander for I2C-Bus
PCF8575: Remote 16-Bit I2C and SMBus I/O Expander with Interrupt Output
TL431A: Adjustable Precision Shunt Regulator
SN74LVC1T45: Single-Bit Dual-Supply Bus Transceiver with Configurable Voltage Translation and 3-State Outputs
SN74HC14: Hex Schmitt-Trigger Inverters

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

Reported Distributor Inventory as of 11:45 AM GMT, 20 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 12 WeeksPCF8574DGVR
Americas	Rochester Electronics	>1k
Europe	Avnet-SILICA	>1k
Worldwide	DigiKey	>1k
Worldwide	Mouser Electronics	350
TI Lead Time*: 12 WeeksPCF8574DGVRE4
Worldwide	DigiKey	Available
TI Lead Time*: 12 WeeksPCF8574DGVRG4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksPCF8574DW
Americas	Arrow	>1k
	Avnet	>1k
	Rochester Electronics	>1k
Asia	WPI	23
Europe	Abacus Polar	440
	Arrow Northern Europe	8
	Avnet-SILICA	>1k
	Compel	937
	EBV Elektronik	>1k
Worldwide	DigiKey	Available
Worldwide	Mouser Electronics	217
TI Lead Time*: 15 WeeksPCF8574DWE4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksPCF8574DWG4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksPCF8574DWR
Americas	Arrow	>1k
Americas	Rochester Electronics	>1k
Asia	WPI	>1k
Europe	Avnet-SILICA	>1k
Worldwide	DigiKey	>1k
TI Lead Time*: 15 WeeksPCF8574DWRE4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksPCF8574DWRG4
Worldwide	DigiKey	Available
TI Lead Time*: 18 WeeksPCF8574N
Americas	Avnet	561
	Newark	350
	Rochester Electronics	>1k
Asia	Farnell Asia	376
Asia	WPI	49
Europe	Avnet-SILICA	>1k
	Compel	>1k
	EBV Elektronik	75
	Spoerle	350
Worldwide	DigiKey	741
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 18 WeeksPCF8574NE4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksPCF8574PW
Americas	Avnet	205
Asia	WPI	70
Europe	Abacus Polar	140
	Avnet-SILICA	110
	EBV Elektronik	19
Worldwide	DigiKey	Available
Worldwide	Mouser Electronics	3
TI Lead Time*: 20 WeeksPCF8574PWE4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksPCF8574PWG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksPCF8574PWR
Americas	Rochester Electronics	>1k
Asia	WPI	>1k
Asia	Wintech	>1k
Europe	Avnet-SILICA	>1k
Worldwide	DigiKey	>1k
Worldwide	Mouser Electronics	352
TI Lead Time*: 20 WeeksPCF8574PWRE4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksPCF8574PWRG4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksPCF8574RGTR
Asia	WPI	>1k
TI Lead Time*: 15 WeeksPCF8574RGTRG4
None Reported View Distributors
TI Lead Time*: 16 WeeksPCF8574RGYR
Asia	WPI	>1k
Worldwide	DigiKey	>1k
Worldwide	Mouser Electronics	950
TI Lead Time*: 16 WeeksPCF8574RGYRG4
Worldwide	DigiKey	Available
Worldwide	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

Most useful technical documents for PCF8574

Datasheet

Remote 8-Bit I/O Expander for I2C Bus (Rev. G) (PDF, 1089 KB)
02 May 2008

Application Notes

Shelf-Life Evaluation of Lead-Free Component Finishes (HTM, 8 KB) 27183 views
24 May 2004 Read Abstract
Understanding and Interpreting Standard-Logic Data Sheets (Rev. B) (HTM, 8 KB) 21623 views
28 May 2003 Read Abstract
Improving System Interrupt Management Using the PCF8574 and PCF8574A I/O Expande (HTM, 9 KB) 2595 views
27 Jul 2001 Read Abstract
Programming Fun Lights With TI's TCA6507 (HTM, 8 KB) 3555 views
30 Nov 2007 Read Abstract

Selection Guides

I2C Guide (Rev. B) (PDF, 2830 KB) 13396 views
12 Aug 2009

More Literature

I2C and Serial Bus Devices Application Clip (PDF, 1671 KB) 1391 views
10 Jul 2003
I2C Application Clip (PDF, 104 KB) 3124 views
19 Jul 2004
PCF8574 and PCF8574A Application Clip (PDF, 289 KB) 2694 views
18 Aug 2004

Simulation Models

IBIS Model
- PCF8574 IBIS Model (Multiple File Format) 416 views
  21 Oct 2005 Read Abstract

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PCF8574 Status: ACTIVE

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

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