PCF8574A Status: ACTIVE

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

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Datasheet

PCF8574A (Rev. D) (PDF 782 KB)
13 Oct 2005

	PCF8574A
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, 16SOIC, 20TSSOP, 20TVSOP, 20VQFN
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

PCF8574: Remote 8-Bit I/O Expander for I2C-Bus
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TLV320AIC33: Low-Power Stereo CODEC with 10 Inputs, 7 Outputs, HP/Speaker Amplifier and Enhanced Digital Effects
MAX232: Dual EIA-232 Driver/Receiver

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	1.00 \| 1ku	TVSOP (DGV) \| 20		2000 \| LARGE T&R
PCF8574ADGVRE4	ACTIVE	-40 to 85	1.00 \| 1ku	TVSOP (DGV) \| 20		2000 \| LARGE T&R
PCF8574ADGVRG4	ACTIVE	-40 to 85	1.00 \| 1ku	TVSOP (DGV) \| 20		2000 \| LARGE T&R
PCF8574ADW	ACTIVE	-40 to 85	1.10 \| 1ku	SOIC (DW) \| 16	View	40 \| TUBE		Purchase Samples
PCF8574ADWE4	ACTIVE	-40 to 85	1.10 \| 1ku	SOIC (DW) \| 16	View	40 \| TUBE		Purchase Samples
PCF8574ADWG4	ACTIVE	-40 to 85	1.10 \| 1ku	SOIC (DW) \| 16	View	40 \| TUBE		Purchase Samples
PCF8574ADWR	ACTIVE	-40 to 85	1.00 \| 1ku	SOIC (DW) \| 16	View	2000 \| LARGE T&R
PCF8574ADWRE4	ACTIVE	-40 to 85	1.00 \| 1ku	SOIC (DW) \| 16	View	2000 \| LARGE T&R
PCF8574ADWRG4	ACTIVE	-40 to 85	1.00 \| 1ku	SOIC (DW) \| 16	View	2000 \| LARGE T&R
PCF8574AN	ACTIVE	-40 to 85	1.00 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE
PCF8574ANE4	ACTIVE	-40 to 85	1.00 \| 1ku	PDIP (N) \| 16	View	25 \| TUBE
PCF8574APW	ACTIVE	-40 to 85	1.10 \| 1ku	TSSOP (PW) \| 20	View	70 \| TUBE		Purchase Samples
PCF8574APWE4	ACTIVE	-40 to 85	1.10 \| 1ku	TSSOP (PW) \| 20	View	70 \| TUBE		Purchase Samples
PCF8574APWG4	ACTIVE	-40 to 85	1.10 \| 1ku	TSSOP (PW) \| 20	View	70 \| TUBE	Purchase Samples
PCF8574APWR	ACTIVE	-40 to 85	1.00 \| 1ku	TSSOP (PW) \| 20	View	2000 \| LARGE T&R
PCF8574APWRE4	ACTIVE	-40 to 85	1.00 \| 1ku	TSSOP (PW) \| 20	View	2000 \| LARGE T&R
PCF8574APWRG4	ACTIVE	-40 to 85	1.00 \| 1ku	TSSOP (PW) \| 20	View	2000 \| LARGE T&R
PCF8574ARGYR	ACTIVE	-40 to 85	1.00 \| 1ku	VQFN (RGY) \| 20		3000 \| LARGE T&R
PCF8574ARGYRG4	ACTIVE	-40 to 85	1.00 \| 1ku	VQFN (RGY) \| 20		3000 \| 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 11:12 AM GMT, 09 Feb 2010
Region	Company	In Stock	Purchase
TI Lead Time*: 20 WeeksPCF8574ADGVR
Americas	Rochester Electronics	>1k
Europe	Avnet-SILICA	>1k
Worldwide	DigiKey	>1k
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 20 WeeksPCF8574ADGVRE4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksPCF8574ADGVRG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksPCF8574ADW
Americas	Avnet	438
	Newark	48
	Rochester Electronics	>1k
Europe	Avnet-SILICA	>1k
Worldwide	DigiKey	Available
Worldwide	Mouser Electronics	387
TI Lead Time*: 20 WeeksPCF8574ADWE4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksPCF8574ADWG4
Americas	Avnet	300
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksPCF8574ADWR
Americas	Avnet	>1k
Americas	Rochester Electronics	>1k
Asia	WPI	960
Worldwide	DigiKey	>1k
Worldwide	Mouser Electronics	28
TI Lead Time*: 20 WeeksPCF8574ADWRE4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksPCF8574ADWRG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksPCF8574AN
Americas	Rochester Electronics	>1k
Asia	Farnell Asia	309
Asia	WPI	21
Europe	Avnet-SILICA	300
Europe	Farnell	309
Worldwide	DigiKey	115
Worldwide	Mouser Electronics	189
TI Lead Time*: 20 WeeksPCF8574ANE4
Worldwide	DigiKey	Available
Worldwide	Mouser Electronics	183
TI Lead Time*: 22 WeeksPCF8574APW
Europe	Avnet-SILICA	5
Worldwide	DigiKey	Available
TI Lead Time*: 22 WeeksPCF8574APWE4
Worldwide	DigiKey	Available
TI Lead Time*: 22 WeeksPCF8574APWG4
Worldwide	DigiKey	Available
TI Lead Time*: 22 WeeksPCF8574APWR
Asia	WPI	554
Worldwide	DigiKey	>1k
TI Lead Time*: 22 WeeksPCF8574APWRE4
Worldwide	DigiKey	Available
TI Lead Time*: 22 WeeksPCF8574APWRG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksPCF8574ARGYR
Americas	Rochester Electronics	>1k
Asia	WPI	913
Worldwide	DigiKey	>1k
TI Lead Time*: 20 WeeksPCF8574ARGYRG4
Worldwide	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

Most useful technical documents for PCF8574A

Datasheet

PCF8574A (Rev. D) (PDF, 782 KB)
13 Oct 2005

Application Notes

Shelf-Life Evaluation of Lead-Free Component Finishes (HTM, 8 KB) 28292 views
24 May 2004 Read Abstract
Understanding and Interpreting Standard-Logic Data Sheets (Rev. B) (HTM, 8 KB) 23173 views
28 May 2003 Read Abstract
Improving System Interrupt Management Using the PCF8574 and PCF8574A I/O Expande (HTM, 9 KB) 2763 views
27 Jul 2001 Read Abstract
Programming Fun Lights With TI's TCA6507 (HTM, 8 KB) 4038 views
30 Nov 2007 Read Abstract

Selection Guides

I2C Guide (Rev. B) (PDF, 2830 KB) 15097 views
12 Aug 2009

More Literature

I2C and Serial Bus Devices Application Clip (PDF, 1671 KB) 1465 views
10 Jul 2003
I2C Application Clip (PDF, 104 KB) 3584 views
19 Jul 2004
PCF8574 and PCF8574A Application Clip (PDF, 289 KB) 3078 views
18 Aug 2004

Simulation Models

IBIS Model
- PCF8574A IBIS Model (Multiple File Format) 291 views
  20 Oct 2005 Read Abstract

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PCF8574A Status: ACTIVE

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

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