PCF8575 Status: ACTIVE

Remote 16-Bit I2C and SMBus I/O Expander with Interrupt Output

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Datasheet

Remote 16-Bit I2C and SMBus I/O Expander With Interrupt Output (Rev. D) (PDF 829 KB)
05 Apr 2007

	PCF8575
Voltage Nodes(V)	5.5, 3.6, 2.7, 2.5
Interrupt Output	Yes
Reset Input	No
fSCLK(Max)(MHz)	0.4
VCC(Min)(V)	2.5
VCC(Max)(V)	5.5
Pin/Package	24SOIC, 24SSOP, 24SSOP/QSOP, 24TSSOP, 24TVSOP, 24VQFN
Operating Temp Range(Celsius)	-40 to 85
Max Frequency(kHz)	400
I2C Address	0100 xxx
# of I/Os	16
Vcc range(V)	2.5 to 5.5
Push–Pull I/O Type	Yes
	Samples
	Inventory

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TPA6011A4: Stereo, Class-AB Audio Amplifier with Volume Control and Stereo Headphone Drive
TPS73701: Single Output LDO, 1A, Adj. (1.2 to 5.0V), Reverse Current Protection

Product Information

Features

Low Standby-Current Consumption of 10 µA Max
I²C to Parallel-Port Expander
Open-Drain Interrupt Output
Compatible With Most Microcontrollers
400-kHz Fast I²C Bus
Address by Three Hardware Address Pins for Use of up to Eight Devices
Latched Outputs With High-Current Drive Capability for Directly Driving LEDs
Current Source to V_CC for Actively Drivinga High at the Output
Latch-Up Performance Exceeds 100 mA Per JESD 78, Class II
ESD Protection Exceeds JESD 22
- 2000-V Human-Body Model (A114-A)
- 200-V Machine Model (A115-A)
- 1000-V Charged-Device Model (C101)

DESCRIPTION/ORDERING INFORMATION

This 16-bit I/O expander for the two-line bidirectional bus (I²C) is designed for 2.5-V to 5.5-V V_CC operation.

The PCF8575 provides general-purpose remote I/O expansion for most microcontroller families via the I²C interface serial clock (SCL) and serial data (SDA).

The device features a 16-bit quasi-bidirectional input/output (I/O) port (P07-P00, P17-P10), 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 (I_OH) to V_CC is active. An additional strong pullup to V_CC (I_OHT) 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. After power on, as all the I/Os are set high, all of them can be used as inputs. Any change in setting of the I/Os as either input or outputs can be done with the write mode. If a high is applied externally to an I/O that has been written earlier to low, a large current (I_OL) will flow to GND.

The PCF8575 provides an open-drain interrupt (INT) output, which 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, the signal 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 (ACK) bit after the rising edge of the SCL signal or in the write mode at the ACK bit after the falling edge of the SCL signal. Interrupts that occur during the ACK 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 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. Thus, the PCF8575 can remain a simple slave device.

Every data transmission to or from the PCF8575 must consist of an even number of bytes. The first data byte in every pair refers to port 0 (P07-P00), and the second data byte in every pair refers to port 1 (P17-P10). To write to the ports (output mode), the master first addresses the slave device, setting the last bit of the byte containing the slave address to logic 0. The PCF8575 acknowledges, and the master sends the first data byte for P07-P00. After the first data byte is acknowledged by the PCF8575, the second data byte (P17-P10) is sent by the master. Once again, the PCF8575 acknowledges the receipt of the data, after which this 16-bit data is presented on the port lines.

The number of data bytes that can be sent successively is not limited. After every two bytes, the previous data is overwritten. When the PCF8575 receives the pairs of data bytes, the first byte is referred to as P07-P00 and the second byte as P17-P10. The third byte is referred to as P07-P00, the fourth byte as P17-P10, and so on.

Before reading from the PCF8575, all ports desired as input should be set to logic 1. To read from the ports (input mode), the master first addresses the slave device, setting the last bit of the byte containing the slave address to logic 1. The data bytes that follow on the SDA are the values on the ports. If the data on the input port changes faster than the master can read, this data may be lost.

When power is applied to V_CC, an internal power-on reset holds the PCF8575 in a reset state until V_CC has reached V_POR. At that time, the reset condition is released, and the device I²C-bus state machine initializes the bus to its default state.

The hardware pins (A0, A1, and A2) are used to program and vary the fixed I²C address and allow up to eight devices to share the same I²C bus or SMBus. The fixed I²C address of the PCF8575 is the same as the PCF8575C, PCF8574, PCA9535, and PCA9555, allowing up to eight of these devices, in any combination, to share the same I²C bus or SMBus.

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
PCF8575DBQR	ACTIVE	-40 to 85	1.45 \| 1ku	SSOP/QSOP (DBQ) \| 24	View	2500 \| LARGE T&R
PCF8575DBQRE4	ACTIVE	-40 to 85	1.45 \| 1ku	SSOP/QSOP (DBQ) \| 24	View	2500 \| LARGE T&R
PCF8575DBQRG4	ACTIVE	-40 to 85	1.45 \| 1ku	SSOP/QSOP (DBQ) \| 24	View	2500 \| LARGE T&R
PCF8575DBR	ACTIVE	-40 to 85	1.60 \| 1ku	SSOP (DB) \| 24	View	2000 \| LARGE T&R
PCF8575DBRE4	ACTIVE	-40 to 85	1.60 \| 1ku	SSOP (DB) \| 24	View	2000 \| LARGE T&R
PCF8575DBRG4	ACTIVE	-40 to 85	1.60 \| 1ku	SSOP (DB) \| 24	View	2000 \| LARGE T&R
PCF8575DGVR	ACTIVE	-40 to 85	1.45 \| 1ku	TVSOP (DGV) \| 24		2000 \| LARGE T&R
PCF8575DGVRE4	ACTIVE	-40 to 85	1.45 \| 1ku	TVSOP (DGV) \| 24		2000 \| LARGE T&R
PCF8575DGVRG4	ACTIVE	-40 to 85	1.45 \| 1ku	TVSOP (DGV) \| 24		2000 \| LARGE T&R
PCF8575DW	ACTIVE	-40 to 85	1.60 \| 1ku	SOIC (DW) \| 24	View	25 \| TUBE	Purchase Samples
PCF8575DWG4	ACTIVE	-40 to 85	1.60 \| 1ku	SOIC (DW) \| 24	View	25 \| TUBE	Purchase Samples
PCF8575DWR	ACTIVE	-40 to 85	1.45 \| 1ku	SOIC (DW) \| 24	View	2000 \| LARGE T&R
PCF8575DWRG4	ACTIVE	-40 to 85	1.45 \| 1ku	SOIC (DW) \| 24	View	2000 \| LARGE T&R
PCF8575PW	ACTIVE	-40 to 85	1.60 \| 1ku	TSSOP (PW) \| 24	View	60 \| TUBE	Purchase Samples
PCF8575PWE4	ACTIVE	-40 to 85	1.60 \| 1ku	TSSOP (PW) \| 24	View	60 \| TUBE		Purchase Samples
PCF8575PWG4	ACTIVE	-40 to 85	1.60 \| 1ku	TSSOP (PW) \| 24	View	60 \| TUBE	Purchase Samples
PCF8575PWR	ACTIVE	-40 to 85	1.45 \| 1ku	TSSOP (PW) \| 24	View	2000 \| LARGE T&R
PCF8575PWRE4	ACTIVE	-40 to 85	1.45 \| 1ku	TSSOP (PW) \| 24	View	2000 \| LARGE T&R
PCF8575PWRG4	ACTIVE	-40 to 85	1.45 \| 1ku	TSSOP (PW) \| 24	View	2000 \| LARGE T&R
PCF8575RGER	ACTIVE	-40 to 85	1.45 \| 1ku	VQFN (RGE) \| 24	View	3000 \| LARGE T&R
PCF8575RGERG4	ACTIVE	-40 to 85	1.45 \| 1ku	VQFN (RGE) \| 24	View	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 11:45 AM GMT, 20 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 15 WeeksPCF8575DBQR
Americas	Arrow	>1k
Europe	Avnet-SILICA	>1k
Worldwide	DigiKey	>1k
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 15 WeeksPCF8575DBQRE4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksPCF8575DBQRG4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksPCF8575DBR
Asia	Wintech	>1k
Europe	Compel	120
Worldwide	DigiKey	5
TI Lead Time*: 15 WeeksPCF8575DBRE4
Americas	Rochester Electronics	>1k
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksPCF8575DBRG4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksPCF8575DGVR
Americas	Arrow	>1k
Americas	Rochester Electronics	>1k
Worldwide	Mouser Electronics	610
TI Lead Time*: 15 WeeksPCF8575DGVRE4
None Reported View Distributors
TI Lead Time*: 15 WeeksPCF8575DGVRG4
None Reported View Distributors
TI Lead Time*: 15 WeeksPCF8575DW
Americas	Arrow	>1k
	Newark	255
	Rochester Electronics	>1k
Worldwide	DigiKey	Available
Worldwide	Mouser Electronics	332
TI Lead Time*: 15 WeeksPCF8575DWG4
Worldwide	DigiKey	Available
TI Lead Time*: 15 WeeksPCF8575DWR
Americas	Arrow	>1k
Asia	WPI	>1k
Europe	Avnet-SILICA	>1k
Worldwide	DigiKey	154
Worldwide	Mouser Electronics	>1k
TI Lead Time*: 15 WeeksPCF8575DWRG4
Worldwide	DigiKey	Available
TI Lead Time*: 20 WeeksPCF8575PW
Americas	Arrow	150
Worldwide	Mouser Electronics	200
TI Lead Time*: 20 WeeksPCF8575PWE4
Asia	Farnell Asia	>1k
Europe	Farnell	>1k
TI Lead Time*: 20 WeeksPCF8575PWG4
None Reported View Distributors
TI Lead Time*: 20 WeeksPCF8575PWR
Americas	Rochester Electronics	>1k
Asia	Wintech	>1k
TI Lead Time*: 20 WeeksPCF8575PWRE4
None Reported View Distributors
TI Lead Time*: 20 WeeksPCF8575PWRG4
None Reported View Distributors
TI Lead Time*: 16 WeeksPCF8575RGER
Americas	Arrow	>1k
Americas	Rochester Electronics	>1k
Worldwide	Mouser Electronics	897
TI Lead Time*: 16 WeeksPCF8575RGERG4
None Reported View Distributors
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
PCF8575DBQR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
PCF8575DBQRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
PCF8575DBQRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
PCF8575DBR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8575DBRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8575DBRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8575DGVR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8575DGVRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8575DGVRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8575DW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8575DWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8575DWR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8575DWRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8575PW	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8575PWE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8575PWG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8575PWR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8575PWRE4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8575PWRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-1-260C-UNLIM	View	View
PCF8575RGER	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
PCF8575RGERG4	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 PCF8575

Datasheet

Remote 16-Bit I2C and SMBus I/O Expander With Interrupt Output (Rev. D) (PDF, 829 KB)
05 Apr 2007

Application Notes

Shelf-Life Evaluation of Lead-Free Component Finishes (HTM, 8 KB) 27183 views
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Selection Guides

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

More Literature

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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
- PCF8575 IBIS Model (Multiple File Format) 258 views
  20 Apr 2005 Read Abstract

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PCF8575 Status: ACTIVE

Remote 16-Bit I2C and SMBus I/O Expander with Interrupt Output

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