PCF8574A Status: ACTIVE

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


      
         
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Datasheet

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 PCF8574A
Voltage Nodes(V)5, 3.3  
Interrupt OutputYes  
Reset InputNo  
fSCLK(Max)(MHz)0.1  
VCC(Min)(V)2.5  
VCC(Max)(V)6  
Pin/Package16PDIP, 16SOIC, 20QFN, 20TSSOP, 20TVSOP  
Operating Temp Range(Celsius)-40 to 85  
Max Frequency(kHz)100  
I2C Address0111 xxx  
# of I/Os8  
Vcc range(V)2.5 to 6.0  
Push–Pull I/O TypeYes  
 Samples
 Inventory

Customers Who Evaluated This Product Also Evaluated

  • PCF8574: Remote 8-Bit I/O Expander for I2C-Bus
  • TPS3823-33: Supply Voltage Supervisor w/Watchdog input and manual reset
  • MAX3232E: 3-V to 5.5-V Multichannel RS-232 Line Driver/Receiver With +/-15kV IEC ESD Protection
  • MAX3221: 3-V to 5.5-V Single-Channel RS-232 Line 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 VCC 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 VCC is active. An additional strong pullup to VCC 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, tiv, 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

PricePackagingCAD Design ToolsSamples
DeviceStatusTemp (oC)Price | QuantityPackage | PinsTop Side MarkingPackage QTY | Package CarrierSymbolsFootprintsSamples
PCF8574ADGVRACTIVE-40 to 851.15 | 1kuTVSOP (DGV) | 20  2000 | LARGE T&R  Download CAD Format for this Footprint
PCF8574ADGVRE4ACTIVE-40 to 851.15 | 1kuTVSOP (DGV) | 20  2000 | LARGE T&R  Download CAD Format for this Footprint
PCF8574ADGVRG4ACTIVE-40 to 851.15 | 1kuTVSOP (DGV) | 20  2000 | LARGE T&R Download CAD Format for this Symbol Download CAD Format for this Footprint
PCF8574ADWACTIVE-40 to 851.25 | 1kuSOIC (DW) | 16 View 40 | TUBE  Download CAD Format for this FootprintPurchase Samples
PCF8574ADWE4ACTIVE-40 to 851.25 | 1kuSOIC (DW) | 16 View 40 | TUBE  Download CAD Format for this FootprintPurchase Samples
PCF8574ADWG4ACTIVE-40 to 851.25 | 1kuSOIC (DW) | 16 View 40 | TUBE  Download CAD Format for this FootprintPurchase Samples
PCF8574ADWRACTIVE-40 to 851.15 | 1kuSOIC (DW) | 16 View 2000 | LARGE T&R  Download CAD Format for this Footprint
PCF8574ADWRE4ACTIVE-40 to 851.15 | 1kuSOIC (DW) | 16 View 2000 | LARGE T&R  Download CAD Format for this Footprint
PCF8574ADWRG4ACTIVE-40 to 851.15 | 1kuSOIC (DW) | 16 View 2000 | LARGE T&R  Download CAD Format for this Footprint
PCF8574ANACTIVE-40 to 851.15 | 1kuPDIP (N) | 16 View 25 | TUBE  Download CAD Format for this Footprint
PCF8574ANE4ACTIVE-40 to 851.15 | 1kuPDIP (N) | 16 View 25 | TUBE Download CAD Format for this Symbol Download CAD Format for this Footprint
PCF8574APWACTIVE-40 to 851.25 | 1kuTSSOP (PW) | 20 View 70 | TUBE  Download CAD Format for this FootprintPurchase Samples
PCF8574APWE4ACTIVE-40 to 851.25 | 1kuTSSOP (PW) | 20 View 70 | TUBE  Download CAD Format for this FootprintPurchase Samples
PCF8574APWG4ACTIVE-40 to 851.25 | 1kuTSSOP (PW) | 20 View 70 | TUBE Download CAD Format for this Symbol Download CAD Format for this FootprintPurchase Samples
PCF8574APWRACTIVE-40 to 851.15 | 1kuTSSOP (PW) | 20 View 2000 | LARGE T&R  Download CAD Format for this Footprint
PCF8574APWRE4ACTIVE-40 to 851.15 | 1kuTSSOP (PW) | 20 View 2000 | LARGE T&R  Download CAD Format for this Footprint
PCF8574APWRG4ACTIVE-40 to 851.15 | 1kuTSSOP (PW) | 20 View 2000 | LARGE T&R  Download CAD Format for this Footprint
PCF8574ARGYRACTIVE-40 to 851.15 | 1kuQFN (RGY) | 20  1000 | LARGE T&R  
PCF8574ARGYRG4ACTIVE-40 to 851.15 | 1kuQFN (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 11:35 AM GMT, 06 Nov 2009
RegionCompanyIn StockPurchase
TI Lead Time*: 12 WeeksPCF8574ADGVR
AmericasRochester Electronics >1k
EuropeAvnet-SILICA >1k
WorldwideDigiKey >1k
Mouser Electronics >1k
TI Lead Time*: 12 WeeksPCF8574ADGVRE4
WorldwideDigiKey  Available
TI Lead Time*: 12 WeeksPCF8574ADGVRG4
WorldwideDigiKey  Available
TI Lead Time*: 15 WeeksPCF8574ADW
AmericasArrow >1k
Avnet 838
Newark 60
Rochester Electronics >1k
AsiaWPI 3
EuropeAbacus Polar 160
Avnet-SILICA >1k
Spoerle 280
WorldwideDigiKey  Available
Mouser Electronics 616
TI Lead Time*: 15 WeeksPCF8574ADWE4
WorldwideDigiKey  Available
TI Lead Time*: 15 WeeksPCF8574ADWG4
AmericasAvnet 300
WorldwideDigiKey  Available
TI Lead Time*: 15 WeeksPCF8574ADWR
AmericasArrow >1k
Avnet >1k
Rochester Electronics >1k
AsiaWPI >1k
Wintech >1k
WorldwideDigiKey >1k
Mouser Electronics >1k
TI Lead Time*: 15 WeeksPCF8574ADWRE4
WorldwideDigiKey  Available
TI Lead Time*: 15 WeeksPCF8574ADWRG4
WorldwideDigiKey  Available
TI Lead Time*: 14 WeeksPCF8574AN
AmericasArrow 145
Newark 190
Rochester Electronics >1k
AsiaWPI 48
EuropeAvnet-SILICA 300
EBV Elektronik 100
WorldwideDigiKey >1k
Mouser Electronics 338
TI Lead Time*: 14 WeeksPCF8574ANE4
WorldwideDigiKey  Available
Mouser Electronics 296
TI Lead Time*: 20 WeeksPCF8574APW
EuropeAvnet-SILICA 5
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksPCF8574APWE4
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksPCF8574APWG4
EuropeEBV Elektronik 45
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksPCF8574APWR
AmericasRochester Electronics >1k
AsiaWPI 578
WorldwideDigiKey >1k
TI Lead Time*: 20 WeeksPCF8574APWRE4
WorldwideDigiKey  Available
TI Lead Time*: 20 WeeksPCF8574APWRG4
WorldwideDigiKey  Available
TI Lead Time*: 14 WeeksPCF8574ARGYR
AmericasRochester Electronics >1k
AsiaWPI 913
WorldwideDigiKey >1k
Mouser Electronics 600
TI Lead Time*: 14 WeeksPCF8574ARGYRG4
WorldwideDigiKey  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 ContentDPPM / MTBF / FIT Rate
DeviceEco Plan* Lead / Ball FinishMSL Rating / Peak ReflowDetailsDetails
PCF8574ADGVR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCF8574ADGVRE4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCF8574ADGVRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCF8574ADW RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCF8574ADWE4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCF8574ADWG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCF8574ADWR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCF8574ADWRE4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCF8574ADWRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCF8574AN RoHS Compliant Pb-Free (RoHS) CU NIPDAU N/A for Pkg TypeViewView
PCF8574ANE4 RoHS Compliant Pb-Free (RoHS) CU NIPDAU N/A for Pkg TypeViewView
PCF8574APW RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCF8574APWE4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCF8574APWG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCF8574APWR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCF8574APWRE4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCF8574APWRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIMViewView
PCF8574ARGYR RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView
PCF8574ARGYRG4 RoHS Compliant Green (RoHS & no Sb/Br) CU NIPDAU Level-2-260C-1 YEARViewView

* 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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