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    PCF8574AP Search Results

    PCF8574AP Result Highlights (5)

    Part ECAD Model Manufacturer Description Download Buy
    PCF8574APWR Texas Instruments Remote 8-Bit I/O Expander for I2C-Bus 20-TSSOP -40 to 85 Visit Texas Instruments Buy
    PCF8574APWRE4 Texas Instruments Remote 8-Bit I/O Expander for I2C-Bus 20-TSSOP -40 to 85 Visit Texas Instruments Buy
    PCF8574APWRG4 Texas Instruments Remote 8-Bit I/O Expander for I2C-Bus 20-TSSOP -40 to 85 Visit Texas Instruments Buy
    PCF8574APWG4 Texas Instruments Remote 8-Bit I/O Expander for I2C-Bus 20-TSSOP -40 to 85 Visit Texas Instruments Buy
    PCF8574APW Texas Instruments Remote 8-Bit I/O Expander for I2C-Bus 20-TSSOP -40 to 85 Visit Texas Instruments Buy
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    PCF8574AP Price and Stock

    Texas Instruments PCF8574APWR

    IC XPNDR 100KHZ I2C 20TSSOP
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey PCF8574APWR Cut Tape 1,986 1
    • 1 $1.18
    • 10 $0.85
    • 100 $0.6798
    • 1000 $0.59029
    • 10000 $0.59029
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    PCF8574APWR Digi-Reel 1,986 1
    • 1 $1.18
    • 10 $0.85
    • 100 $0.6798
    • 1000 $0.59029
    • 10000 $0.59029
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    PCF8574APWR Reel 2,000
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    Mouser Electronics PCF8574APWR 8,289
    • 1 $1.18
    • 10 $0.77
    • 100 $0.638
    • 1000 $0.591
    • 10000 $0.538
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    Newark PCF8574APWR Cut Tape 312 1
    • 1 $0.694
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    Bristol Electronics PCF8574APWR 479
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    Quest Components PCF8574APWR 1,260
    • 1 $1.4
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    • 100 $0.42
    • 1000 $0.364
    • 10000 $0.364
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    PCF8574APWR 220
    • 1 $2.3612
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    • 100 $1.2987
    • 1000 $1.1806
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    TME PCF8574APWR 228 1
    • 1 $1.76
    • 10 $1.56
    • 100 $1.22
    • 1000 $0.68
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    Chip 1 Exchange PCF8574APWR 645
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    Component Electronics, Inc PCF8574APWR 3
    • 1 $1.54
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    • 100 $1.15
    • 1000 $1
    • 10000 $1
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    Win Source Electronics PCF8574APWR 15,000
    • 1 -
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    • 100 $0.5796
    • 1000 $0.3864
    • 10000 $0.3864
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    Texas Instruments PCF8574APW

    IC XPNDR 100KHZ I2C 20TSSOP
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    DigiKey PCF8574APW Tube 350
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    • 1000 $1.37706
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    Quest Components PCF8574APW 80
    • 1 $3.75
    • 10 $2.75
    • 100 $2.5
    • 1000 $2.5
    • 10000 $2.5
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    Rochester Electronics PCF8574APW 98 1
    • 1 $1.17
    • 10 $1.17
    • 100 $1.1
    • 1000 $0.9945
    • 10000 $0.9945
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    Win Source Electronics PCF8574APW 15,000
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    • 100 $1.314
    • 1000 $1.068
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    Texas Instruments PCF8574APWG4

    IC XPNDR 100KHZ I2C 20TSSOP
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    DigiKey PCF8574APWG4 Tube 350
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    • 1000 $1.70083
    • 10000 $1.70083
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    NXP Semiconductors PCF8574AP,112

    IC XPNDR 100KHZ I2C 16DIP
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    DigiKey PCF8574AP,112 Bulk
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    Texas Instruments PCF8574APWRG4

    IC XPNDR 100KHZ I2C 20TSSOP
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    DigiKey PCF8574APWRG4 Reel 2,000
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    • 10000 $0.83419
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    Mouser Electronics PCF8574APWRG4
    • 1 $1.33
    • 10 $1.2
    • 100 $0.93
    • 1000 $0.779
    • 10000 $0.777
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    Win Source Electronics PCF8574APWRG4 15,000
    • 1 -
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    • 100 $1.0144
    • 1000 $0.6763
    • 10000 $0.6763
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    PCF8574AP Datasheets (33)

    Part ECAD Model Manufacturer Description Curated Datasheet Type PDF
    PCF8574AP NXP Semiconductors Remote 8-bit I/O expander for I2C-bus with interrupt Original PDF
    PCF8574AP NXP Semiconductors AN469 - I2C/SMBus general purpose I/O expanders Original PDF
    PCF8574AP Philips Semiconductors Remote 8-bit I/O expander for I 2 C-bus Original PDF
    PCF8574AP Unknown Shortform IC and Component Datasheets (Plus Cross Reference Data) Short Form PDF
    PCF8574AP Unknown Shortform Data and Cross References (Misc Datasheets) Short Form PDF
    PCF8574AP Philips Semiconductors Remote 8-bit I/O expander for I2C-bus Scan PDF
    PCF8574AP Philips Semiconductors Remote 8-Bit I/O Expander for I2C Bus Scan PDF
    PCF8574AP Philips Semiconductors Remote 8-bit I/O expander for I2C-bus Scan PDF
    PCF8574AP Philips Semiconductors Remote 8-bit I/O expander for I2C-bus Scan PDF
    PCF8574AP,112 NXP Semiconductors Remote 8-bit I/O expander for I2C-bus - # of Addresses: 4 ; I2C-bus: 100 kHz; Interrupt: 0-1 ; Max Sink Current per bit: 20 mA; Max Sink Current, per package: 100 mA; Number of bits: 8 ; Operating temperature: -40~85 Cel; Operating voltage: 2.5~6.0 VDC; Source Current per bit: 0.1 mA; Weak Pull-Up Current Source: yes; Package: SOT38-4 (DIP16); Container: Bulk Pack Original PDF
    PCF8574AP,112 NXP Semiconductors Interface - I/O Expanders, Integrated Circuits (ICs), IC I/O EXPANDER I2C 8B 16DIP Original PDF
    PCF8574APN NXP Semiconductors Remote 8-bit I/O expander for I2C-bus - # of Addresses: 4 ; I2C-bus: 100 kHz; Interrupt: 0-1 ; Max Sink Current per bit: 20 mA; Max Sink Current, per package: 100 mA; Number of bits: 8 ; Operating temperature: -40~85 Cel; Operating voltage: 2.5~6.0 VDC; Source Current per bit: 0.1 mA; Weak Pull-Up Current Source: yes Original PDF
    PCF8574APN Unknown Historical semiconductor price guide (US$ - 1998). From our catalog scanning project. Historical PDF
    PCF8574APN Philips Semiconductors Remote 8-Bit I/O Expander for I2C Bus Scan PDF
    PCF8574APW Texas Instruments LED, Remote 8-Bit I/O Expander for I2C-Bus Original PDF
    PCF8574APW Texas Instruments Remote 8-Bit I/O Expander for I2C-Bus 20-TSSOP -40 to 85 Original PDF
    PCF8574APW Texas Instruments PCF8574 - Remote 8-Bit I/O Expander for I2C-Bus 20-TSSOP -40 to 85 Original PDF
    PCF8574APWE4 Texas Instruments Remote 8-Bit I/O Expander for I2C-Bus 20-TSSOP -40 to 85 Original PDF
    PCF8574APWE4 Texas Instruments Remote 8-Bit I/O Expander for I2C-Bus Original PDF
    PCF8574APWE4 Texas Instruments PCF8574 - Remote 8-Bit I/O Expander for I2C-Bus 20-TSSOP -40 to 85 Original PDF

    PCF8574AP Datasheets Context Search

    Catalog Datasheet MFG & Type PDF Document Tags

    8051 microcontroller LED dot matrix

    Abstract: led display alarm clock 8051 microcontroller Digital Clock with Alarm Using PCF8583P and 8051 circuit diagram of bi colour led blinker PCF8575 PCF8577 PCA9518 z80 processor application traffic circuit p87c528 replacement ic software program pcf8583
    Text: s bu I C2 a ria ld at se ria lc lo ck se Quarndon Electronics Quarndon Electronics Ltd. Slack Lane Derby DE22 3ED tel: 01332 332651 fax: 01332 360922 email: sales@quarndon.co.uk website: www.quarndon.co.uk Contents 3 Philips Semiconductor I2C Devices 3 Typical I2C Product Characteristics


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    PDF PCA9518, 8051 microcontroller LED dot matrix led display alarm clock 8051 microcontroller Digital Clock with Alarm Using PCF8583P and 8051 circuit diagram of bi colour led blinker PCF8575 PCF8577 PCA9518 z80 processor application traffic circuit p87c528 replacement ic software program pcf8583

    PCA9555

    Abstract: AN469 PCA9536 PCF8574TS-T PCA9539D-T 24c02 eeprom smbus PCA9534 PCA9535 PCA95xx PCA9538
    Text: AN469 I2C/SMBus general purpose I/O expanders Rev. 02 — 20 January 2005 Application note Document information Info Content Keywords I2C-bus, I/O expander, GPIO, EEPROM Abstract One of the more common functions of the I2C-bus is to provide additional I/O port capability for a controller without increasing the number of pins on


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    PDF AN469 PCA9555 AN469 PCA9536 PCF8574TS-T PCA9539D-T 24c02 eeprom smbus PCA9534 PCA9535 PCA95xx PCA9538

    Untitled

    Abstract: No abstract text available
    Text: PCF8574A REMOTE 8-BIT I/O EXPANDER FOR I2C BUS www.ti.com SCPS069D – JULY 2001 – REVISED OCTOBER 2005 FEATURES • 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC SDA SCL INT P7 P6 P5 P4 P7 1 1 20 DGV OR PW PACKAGE TOP VIEW 3 4 19 P6 18 NC 17 P5 5 6 16 P4 15 GND


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    PDF PCF8574A SCPS069D

    SCPS069

    Abstract: No abstract text available
    Text: PCF8574A REMOTE 8-BIT I/O EXPANDER FOR I2C BUS SCPS069 – JULY 2001 D D D D D D Low Standby Current Consumption of 10 µA Maximum I2C to Parallel Port Expander Open-Drain Interrupt Output Compatible With Most Microcontrollers Latched Outputs With High Current Drive


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    PDF PCF8574A SCPS069 PCF8574A, PCF8574APWR PCF8574ARGYR SCPS069

    5555 FAIRCHILD optocoupler

    Abstract: MC74HC374N 74hc14n equivalent NC7S125M5 14069 HCF4541BEY APPLICATION HCF4013BE 4026 fairchild datasheet 14543 motorola Motorola DM74LS139N
    Text: R E L I A B L E . L O G I C . I N N O V A T I O N . Logic Cross-Reference Logic Cross-Reference 2003 Texas Instruments Printed in the U.S.A. by Texoma Business Forms, Durant, Oklahoma Printed on recycled paper. SCYB017A NEW First Revision Logic Cross-Reference


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    PDF SCYB017A A010203 5555 FAIRCHILD optocoupler MC74HC374N 74hc14n equivalent NC7S125M5 14069 HCF4541BEY APPLICATION HCF4013BE 4026 fairchild datasheet 14543 motorola Motorola DM74LS139N

    computer motherboard circuit diagram P4

    Abstract: ST92F120 programmer PC MOTHERBOARD CIRCUIT diagram 10K-RV MW1X12C PC MOTHERBOARD CIRCUIT diagram p4 led 7 segment display POWER SUPPLY WITH 7 SEGMENT DISPLAY 12 pin 7 segment display layout MAX232 I2C control display
    Text: ST9 FAMILY Evaluation Board GETTING STARTED Release 1.7 October 2002 1 USE IN LIFE SUPPORT DEVICES OR SYSTEMS MUST BE EXPRESSLY AUTHORIZED. STMicroelectronics PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF


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    PDF

    Untitled

    Abstract: No abstract text available
    Text: PCF8574A REMOTE 8-BIT I/O EXPANDER FOR I2C BUS www.ti.com SCPS069D – JULY 2001 – REVISED OCTOBER 2005 FEATURES • 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC SDA SCL INT P7 P6 P5 P4 P7 1 1 20 DGV OR PW PACKAGE TOP VIEW 3 4 19 P6 18 NC 17 P5 5 6 16 P4 15 GND


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    PDF PCF8574A SCPS069D

    PF574A

    Abstract: No abstract text available
    Text: PCF8574A REMOTE 8-BIT I/O EXPANDER FOR I2C BUS www.ti.com SCPS069D – JULY 2001 – REVISED OCTOBER 2005 FEATURES • 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC SDA SCL INT P7 P6 P5 P4 P7 1 1 20 DGV OR PW PACKAGE TOP VIEW 3 4 19 P6 18 NC 17 P5 5 6 16 P4 15 GND


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    PDF PCF8574A SCPS069D PF574A

    PF574A

    Abstract: PCF8574A PCF8574 PCF8574ADGVR PCF8574ADW PCF8574ADWR PCF8574AN PCF8574APWR PCF8574ARGYR PF57
    Text: PCF8574A REMOTE 8-BIT I/O EXPANDER FOR I2C BUS www.ti.com SCPS069C – JULY 2001 – REVISED APRIL 2005 • • FEATURES 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC SDA SCL INT P7 P6 P5 P4 P7 16 2 1 20 DGV OR PW PACKAGE TOP VIEW 3 4 19 P6 18 NC 17 P5 5 6 16 P4 15 GND


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    PDF PCF8574A SCPS069C PF574A PCF8574A PCF8574 PCF8574ADGVR PCF8574ADW PCF8574ADWR PCF8574AN PCF8574APWR PCF8574ARGYR PF57

    PCF8574A

    Abstract: PCF8574ADGVR PCF8574ADGVRE4 PCF8574ADW PCF8574ADWR PCF8574AN PCF8574APWR PCF8574ARGYR PF574A
    Text: PCF8574A REMOTE 8-BIT I/O EXPANDER FOR I2C BUS www.ti.com SCPS069D – JULY 2001 – REVISED OCTOBER 2005 FEATURES • 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC SDA SCL INT P7 P6 P5 P4 P7 1 1 20 DGV OR PW PACKAGE TOP VIEW 3 4 19 P6 18 NC 17 P5 5 6 16 P4 15 GND


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    PDF PCF8574A SCPS069D PCF8574A PCF8574ADGVR PCF8574ADGVRE4 PCF8574ADW PCF8574ADWR PCF8574AN PCF8574APWR PCF8574ARGYR PF574A

    BLF4G08LS-160A

    Abstract: J3A080GA4/T0BG1610 MARKING S08 NXP TJA1050T-CM,11 power+wizard+1.1+fault+codes SCC2691AC1A28 IP5004CX6 TDA8275AHN/C1,557 H3-BGA3XX_11 BZA456A
    Text: NXP Semiconductors Product Discontinuation DN66 June 30, 2010 SEE DN66 NOTICE LETTER FOR APPLICABLE LAST TIME BUY TERMS, CONDITIONS AND CODE DEFINITIONS FOR THESE DISCONTINUED PRODUCTS. FOR ADDED INFORMATION, REFER TO NXP WEB-SITE "http://www.nxp.com/products/eol/"


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    PDF 31-Dec-10 30-Jun-11 UBA2074AT/N1 UBA2074T/N1 UBA2074T/N1 31-Mar-11 UBA2074TS/N1 UBA2074TS/N1 BLF4G08LS-160A J3A080GA4/T0BG1610 MARKING S08 NXP TJA1050T-CM,11 power+wizard+1.1+fault+codes SCC2691AC1A28 IP5004CX6 TDA8275AHN/C1,557 H3-BGA3XX_11 BZA456A

    PCF8574A

    Abstract: pf574a PCF8574ADGVR PCF8574ADGVRE4 PCF8574ADW PCF8574ADWR PCF8574AN PCF8574APWR PCF8574ARGYR
    Text: PCF8574A REMOTE 8-BIT I/O EXPANDER FOR I2C BUS www.ti.com SCPS069D – JULY 2001 – REVISED OCTOBER 2005 FEATURES • 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC SDA SCL INT P7 P6 P5 P4 P7 1 1 20 DGV OR PW PACKAGE TOP VIEW 3 4 19 P6 18 NC 17 P5 5 6 16 P4 15 GND


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    PDF PCF8574A SCPS069D PCF8574A pf574a PCF8574ADGVR PCF8574ADGVRE4 PCF8574ADW PCF8574ADWR PCF8574AN PCF8574APWR PCF8574ARGYR

    schematic diagram atx Power supply 500w

    Abstract: pioneer PAL 012A 1000w inverter PURE SINE WAVE schematic diagram 600va numeric ups circuit diagrams winbond bios 25064 TLE 9180 infineon smsc MEC 1300 nu TBE schematic diagram inverter 2000w DK55 circuit diagram of luminous 600va UPS
    Text: QUICK INDEX NEW IN THIS ISSUE! Detailed Index - See Pages 3-24 Digital Signal Processors, iCoupler , iMEMS® and iSensor . . . . . 805, 2707, 2768-2769 Connectors, Cable Assemblies, IC Sockets . . . . . . . . . . . 28-568 RF Connectors . . . . . . . . . . . . . . . . . . . . . . Pages 454-455


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    PDF P462-ND P463-ND LNG295LFCP2U LNG395MFTP5U US2011) schematic diagram atx Power supply 500w pioneer PAL 012A 1000w inverter PURE SINE WAVE schematic diagram 600va numeric ups circuit diagrams winbond bios 25064 TLE 9180 infineon smsc MEC 1300 nu TBE schematic diagram inverter 2000w DK55 circuit diagram of luminous 600va UPS

    Untitled

    Abstract: No abstract text available
    Text: PCF8574A REMOTE 8-BIT I/O EXPANDER FOR I2C BUS www.ti.com SCPS069D – JULY 2001 – REVISED OCTOBER 2005 FEATURES • 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC SDA SCL INT P7 P6 P5 P4 P7 1 1 20 DGV OR PW PACKAGE TOP VIEW 3 4 19 P6 18 NC 17 P5 5 6 16 P4 15 GND


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    PDF PCF8574A SCPS069D

    Untitled

    Abstract: No abstract text available
    Text: PCF8574A REMOTE 8ĆBIT I/O EXPANDER FOR I2C BUS SCPS069B − JULY 2001 − REVISED JANUARY 2004 D Low Standby-Current Consumption of 15 3 14 4 13 5 12 6 11 7 10 8 9 SCL NC SDA VCC A0 A1 NC A2 P7 2 VCC SDA SCL INT P7 P6 P5 P4 1 20 DGV OR PW PACKAGE TOP VIEW


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    PDF PCF8574A SCPS069B

    PCF85741

    Abstract: PCF8574 pcf8574 Application Note PCF8574A PCF8574AP PCF8574AT PCF8574P PCF8574T PCF8574TS SSOP20
    Text: Philips Semiconductors Product specification Remote 8-bit I/O expander for I2C-bus PCF8574 FEATURES • Operating supply voltage 2.5 to 6 V • Low standby current consumption of 10 µA maximum • I2C to parallel port expander • Open-drain interrupt output


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    PDF PCF8574 PCF8574 PCF85741 pcf8574 Application Note PCF8574A PCF8574AP PCF8574AT PCF8574P PCF8574T PCF8574TS SSOP20

    ST92F120 programmer

    Abstract: computer motherboard circuit diagram P4 vc 22p trimmer MAX232 pin diagram mother board power soft start reset circuit POWER SUPPLY WITH 7 SEGMENT DISPLAY PC MOTHERBOARD CIRCUIT diagram mc74HC541b1 "7 Segment Display" 7-segment-display pin configuration
    Text: ST9 FAMILY Evaluation Board GETTING STARTED c u d e t le s t o r P o s b O - ) Release 1.7 s ( ct u d o r P e s b O t e l o October 2002 1 c u d e t le ) s ( ct ) s t( o r P o s b O - u d o r P e t e l o s b O USE IN LIFE SUPPORT DEVICES OR SYSTEMS MUST BE EXPRESSLY AUTHORIZED.


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    PDF

    pca8574a

    Abstract: No abstract text available
    Text: UM10751 OM13488 8-bit GPIO Daughter Card User Manual Rev. 1.0 — 11 October 2013 User manual Document information Info Content Keywords Fm+ Development Kit, OM13320, GPIO, OM13303 Abstract Installation guide and User Manual for the OM13488 8-bit GPIO Daughter


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    PDF UM10751 OM13488 OM13320, OM13303 OM13320 pca8574a

    PF574A

    Abstract: No abstract text available
    Text: PCF8574A REMOTE 8-BIT I/O EXPANDER FOR I2C BUS www.ti.com SCPS069D – JULY 2001 – REVISED OCTOBER 2005 FEATURES • 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 VCC SDA SCL INT P7 P6 P5 P4 P7 1 1 20 DGV OR PW PACKAGE TOP VIEW 3 4 19 P6 18 NC 17 P5 5 6 16 P4 15 GND


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    PDF PCF8574A SCPS069D PF574A

    pcf8574 Application Note

    Abstract: PCF85741 PCF8574 PCF8574s PCF8574A PCF8574AP PCF8574T mab8400 PCFB PCF8574P
    Text: PCF8574 PCF8574A BUS REMOTE 8-BIT I/O EXPANDER FOR l2C-BUS G E N E R A L D E S C R IP T IO N The PCF8574 is a single-chip silicon gate CMOS circuit. It provides remote I/O expansion fo r the MAB8400 and PCF84CXX m icrocontroller families via the two-line serial bidirectional bus l2C .


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    PDF PCF8574 PCF8574A PCF8574 MAB8400 PCF84CXX pcf8574 Application Note PCF85741 PCF8574s PCF8574A PCF8574AP PCF8574T PCFB PCF8574P

    pj 929 diode picture

    Abstract: bf471 A7R SMD Transistor TDA8391 transistor f488 tda8351 pin-compatible tda1000 Germanium drift transistor marking 3U 3T 3C diode germanium transistor
    Text: Philips Sem iconductors Semiconductors for Television and Video Systems Contents PART A page SELECTION GUIDE Functional index 5 Numerical index 17 Maintainance list 27 GENERAL Quality 31 Pro Electron type numbering system for Discrete Semiconductors 31 Pro Electron type numbering system for Integrated Circuits


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    PDF BA481 SAA7197 SAA7199B TDA4680 TDA4685 pA733C LFC02 MEH469 pj 929 diode picture bf471 A7R SMD Transistor TDA8391 transistor f488 tda8351 pin-compatible tda1000 Germanium drift transistor marking 3U 3T 3C diode germanium transistor

    PCF8574

    Abstract: No abstract text available
    Text: Philips Sem iconductors Short-form product specification Remote 8-bit I/O expander for l2C-bus PCF8574 es FEATURES • Operating supply voltage 2.5 to 6 V • Low standby current consumption of 10 maximum fSj is • l2C to parallel port expander • O pen-drain interrupt output


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    PDF PCF8574A) DIP16, SSOP20 PCF8574 PCF8574 F8574 PCF0574A PCF8574TS MBD979 DIP16;

    PCF8574

    Abstract: PCF8574A PCF8574AP PCF8574AT PCF8574P PCF8574T PCF8574TS pcf8574 Application Note PCF8574S PCF85741
    Text: Philips Semiconductors Product specification Remote 8-bit I/O expander for l2C-bus PCF8574 CONTENTS 1 FEATURES 2 GENERAL DESCRIPTION 3 ORDERING INFORMATION 4 BLOCK DIAGRAM 5 PINNING 6 CHARACTERISTICS OF THE l2C-BUS 6.1 6.2 6.3 6.4 Bit transfer Start and stop conditions


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    PDF PCF8574 PCF8574 PCF8574A PCF8574AP PCF8574AT PCF8574P PCF8574T PCF8574TS pcf8574 Application Note PCF8574S PCF85741

    PCF875

    Abstract: PM8447 mab8400 8048 SAA9064 Signetics 8035 PCF8577T
    Text: I2C Peripherals for Microcontrollers Signetics Philips Sem iconductors [philips I PHILIPS Signetics reserves the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve


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    PDF