Please enter a valid full or partial manufacturer part number with a minimum of 3 letters or numbers

    CD74HC193M Search Results

    CD74HC193M Result Highlights (3)

    Part ECAD Model Manufacturer Description Download Buy
    CD74HC193M96 Texas Instruments High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counter with Asynchronous Reset 16-SOIC -55 to 125 Visit Texas Instruments
    CD74HC193M Texas Instruments High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counter with Asynchronous Reset 16-SOIC -55 to 125 Visit Texas Instruments Buy
    CD74HC193MT Texas Instruments High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counter with Asynchronous Reset 16-SOIC -55 to 125 Visit Texas Instruments
    SF Impression Pixel

    CD74HC193M Price and Stock

    Texas Instruments CD74HC193M96

    IC BINARY COUNTER 4-BIT 16SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey CD74HC193M96 Reel 2,500 2,500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.18453
    Buy Now
    CD74HC193M96 Cut Tape 1
    • 1 $0.87
    • 10 $0.54
    • 100 $0.3512
    • 1000 $0.24624
    • 10000 $0.24624
    Buy Now
    CD74HC193M96 Digi-Reel 1
    • 1 $0.87
    • 10 $0.54
    • 100 $0.3512
    • 1000 $0.24624
    • 10000 $0.24624
    Buy Now
    Mouser Electronics CD74HC193M96 2,390
    • 1 $0.86
    • 10 $0.452
    • 100 $0.302
    • 1000 $0.247
    • 10000 $0.171
    Buy Now
    Rochester Electronics CD74HC193M96 2,500 1
    • 1 $0.1838
    • 10 $0.1838
    • 100 $0.1728
    • 1000 $0.1562
    • 10000 $0.1562
    Buy Now

    Rochester Electronics LLC CD74HC193MT

    IC BINARY COUNTER 4-BIT 16SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey CD74HC193MT Bulk 2,437 693
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.43
    • 10000 $0.43
    Buy Now

    Rochester Electronics LLC CD74HC193M

    IC BINARY COUNTER 4-BIT 16SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey CD74HC193M Tube 1,098 693
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.43
    • 10000 $0.43
    Buy Now

    Texas Instruments CD74HC193M

    IC BINARY COUNTER 4-BIT 16SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey CD74HC193M Tube 761 1
    • 1 $1.63
    • 10 $1.03
    • 100 $0.6933
    • 1000 $0.5526
    • 10000 $0.5526
    Buy Now
    Newark CD74HC193M Bulk 1
    • 1 $1.16
    • 10 $1.07
    • 100 $0.975
    • 1000 $0.879
    • 10000 $0.879
    Buy Now
    Quest Components CD74HC193M 20
    • 1 $0.8367
    • 10 $0.6973
    • 100 $0.6973
    • 1000 $0.6973
    • 10000 $0.6973
    Buy Now
    Rochester Electronics CD74HC193M 11,730 1
    • 1 $0.4375
    • 10 $0.4375
    • 100 $0.4113
    • 1000 $0.3719
    • 10000 $0.3719
    Buy Now

    Texas Instruments CD74HC193MT

    IC BINARY COUNTER 4-BIT 16SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey CD74HC193MT Reel 750 250
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.5757
    • 10000 $0.40299
    Buy Now
    CD74HC193MT Cut Tape 235 1
    • 1 $1.63
    • 10 $1.03
    • 100 $0.6933
    • 1000 $0.6933
    • 10000 $0.6933
    Buy Now
    CD74HC193MT Digi-Reel 1
    • 1 $1.63
    • 10 $1.03
    • 100 $0.6933
    • 1000 $0.6933
    • 10000 $0.6933
    Buy Now
    Rochester Electronics CD74HC193MT 2,437 1
    • 1 $0.4375
    • 10 $0.4375
    • 100 $0.4113
    • 1000 $0.3719
    • 10000 $0.3719
    Buy Now

    CD74HC193M Datasheets (28)

    Part ECAD Model Manufacturer Description Curated Type PDF
    CD74HC193M Texas Instruments High-Speed CMOS Logic Presettable Synchronous 4 Bit Up/Down Counters Original PDF
    CD74HC193M Texas Instruments High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counter with Asynchronous Reset 16-SOIC -55 to 125 Original PDF
    CD74HC193M Texas Instruments HIGH SPEED CMOS LOGIC PRESETTABLE SYNCHRONOUS 4-BIT BINARY UP/DOWN COUNTER WITH ASYNCHRONOUS RESET Original PDF
    CD74HC193M Texas Instruments CD74HC193 - High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counter with Asynchronous Reset 16-SOIC -55 to 125 Original PDF
    CD74HC193M Unknown Historical semiconductor price guide (US$ - 1998). From our catalog scanning project. Historical PDF
    CD74HC193M96 Texas Instruments High-Speed CMOS Logic Presettable Synchronous 4 Bit Up/Down Counters Original PDF
    CD74HC193M96 Texas Instruments HIGH SPEED CMOS LOGIC PRESETTABLE SYNCHRONOUS 4-BIT BINARY UP/DOWN COUNTER WITH ASYNCHRONOUS RESET Original PDF
    CD74HC193M96 Texas Instruments High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counter with Asynchronous Reset 16-SOIC -55 to 125 Original PDF
    CD74HC193M96 Texas Instruments CD74HC193 - High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counter with Asynchronous Reset 16-SOIC -55 to 125 Original PDF
    CD74HC193M96 Unknown Historical semiconductor price guide (US$ - 1998). From our catalog scanning project. Historical PDF
    CD74HC193M96E4 Texas Instruments High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counter with Asynchronous Reset Original PDF
    CD74HC193M96E4 Texas Instruments High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counter with Asynchronous Reset 16-SOIC -55 to 125 Original PDF
    CD74HC193M96E4 Texas Instruments CD74HC193 - High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counter with Asynchronous Reset 16-SOIC -55 to 125 Original PDF
    CD74HC193M96G4 Texas Instruments High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counter with Asynchronous Reset 16-SOIC -55 to 125 Original PDF
    CD74HC193M96G4 Texas Instruments CD74HC193 - High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counter with Asynchronous Reset 16-SOIC -55 to 125 Original PDF
    CD74HC193ME4 Texas Instruments High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counter with Asynchronous Reset Original PDF
    CD74HC193ME4 Texas Instruments High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counter with Asynchronous Reset 16-SOIC -55 to 125 Original PDF
    CD74HC193ME4 Texas Instruments CD74HC193 - High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counter with Asynchronous Reset 16-SOIC -55 to 125 Original PDF
    CD74HC193MG4 Texas Instruments High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counter with Asynchronous Reset 16-SOIC -55 to 125 Original PDF
    CD74HC193MG4 Texas Instruments CD74HC193 - High Speed CMOS Logic Presettable Synchronous 4-Bit Binary Up/Down Counter with Asynchronous Reset 16-SOIC -55 to 125 Original PDF

    CD74HC193M Datasheets Context Search

    Catalog Datasheet MFG & Type PDF Document Tags

    HC192

    Abstract: No abstract text available
    Text: [ /Title CD74 HC192 , CD74 HC193 , CD74 HCT19 3 /Subject (High Speed CMOS Logic Preset- CD54/74HC192, CD54/74HC193, CD54/74HCT193 Data sheet acquired from Harris Semiconductor SCHS163D September 1997 - Revised December 2002 High Speed CMOS Logic Presettable Synchronous 4-Bit Up/Down Counters


    Original
    PDF CD54/74HC192, CD54/74HC193, CD54/74HCT193 SCHS163D HC192, HC193 HCT193 5962-9084801MEA 9084801MEAS2035 CD54HCT193F3A HC192

    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


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

    Untitled

    Abstract: No abstract text available
    Text: [ /Title CD74 HC192 , CD74 HC193 , CD74 HCT19 3 /Subject (High Speed CMOS Logic Preset- CD54/74HC192, CD54/74HC193, CD54/74HCT193 Data sheet acquired from Harris Semiconductor SCHS163F September 1997 - Revised October 2003 High-Speed CMOS Logic Presettable Synchronous 4-Bit Up/Down Counters


    Original
    PDF CD54/74HC192, CD54/74HC193, CD54/74HCT193 SCHS163F

    74hc192

    Abstract: CD74HC192 application note
    Text: [ /Title CD74 HC192 , CD74 HC193 , CD74 HCT19 3 /Subject (High Speed CMOS Logic Preset- CD54/74HC192, CD54/74HC193, CD54/74HCT193 Data sheet acquired from Harris Semiconductor SCHS163F September 1997 - Revised October 2003 High-Speed CMOS Logic Presettable Synchronous 4-Bit Up/Down Counters


    Original
    PDF CD54/74HC192, CD54/74HC193, CD54/74HCT193 SCHS163F scyd013 sdyu001x sgyc003d SN74HC4851/HC4852 scyb019b scyb017a 74hc192 CD74HC192 application note

    Untitled

    Abstract: No abstract text available
    Text: [ /Title CD74 HC192 , CD74 HC193 , CD74 HCT19 3 /Subject (High Speed CMOS Logic Preset- CD54/74HC192, CD54/74HC193, CD54/74HCT193 Data sheet acquired from Harris Semiconductor SCHS163F September 1997 - Revised October 2003 High-Speed CMOS Logic Presettable Synchronous 4-Bit Up/Down Counters


    Original
    PDF CD54/74HC192, CD54/74HC193, CD54/74HCT193 SCHS163F

    Untitled

    Abstract: No abstract text available
    Text: [ /Title CD74 HC192 , CD74 HC193 , CD74 HCT19 3 /Subject (High Speed CMOS Logic Preset- CD54/74HC192, CD54/74HC193, CD54/74HCT193 Data sheet acquired from Harris Semiconductor SCHS163F September 1997 - Revised October 2003 High-Speed CMOS Logic Presettable Synchronous 4-Bit Up/Down Counters


    Original
    PDF HC192 HC193 HCT19 CD54/74HC192, CD54/74HC193, CD54/74HCT193 SCHS163F

    Untitled

    Abstract: No abstract text available
    Text: [ /Title CD74 HC192 , CD74 HC193 , CD74 HCT19 3 /Subject (High Speed CMOS Logic Preset- CD54/74HC192, CD54/74HC193, CD54/74HCT193 Data sheet acquired from Harris Semiconductor SCHS163F September 1997 - Revised October 2003 High-Speed CMOS Logic Presettable Synchronous 4-Bit Up/Down Counters


    Original
    PDF CD54/74HC192, CD54/74HC193, CD54/74HCT193 SCHS163F

    CD4000 series

    Abstract: CD4060BE CD4017BE CD40106BE CD4541BE CD4066BE CD4511BE DATASHEET CD4511BE CD4011BE CD4020BE Datasheet
    Text: CD4000 Series CD4001BE CD4001BM CD4001BM96 CD4001UBE CD4001UBM CD4002BE CD4006BE CD4007UBE CD4007UBM CD4009UBE CD4010BE CD4011BE CD4011BM CD4011BM96 CD4011UBE CD4011UBM CD4012BE CD4012BM CD4012BM96 CD4013BE CD4013BM CD4013BM96 CD4014BE CD4015BE CD4016BE


    Original
    PDF CD4000 CD4001BE CD4001BM CD4001BM96 CD4001UBE CD4001UBM CD4002BE CD4006BE CD4007UBE CD4007UBM CD4000 series CD4060BE CD4017BE CD40106BE CD4541BE CD4066BE CD4511BE DATASHEET CD4511BE CD4011BE CD4020BE Datasheet

    HC193

    Abstract: CD54HC192 CD54HC193 HC192
    Text: [ /Title CD74 HC192 , CD74 HC193 , CD74 HCT19 3 /Subject (High Speed CMOS Logic Preset- CD54/74HC192, CD54/74HC193, CD54/74HCT193 Data sheet acquired from Harris Semiconductor SCHS163D September 1997 - Revised December 2002 High Speed CMOS Logic Presettable Synchronous 4-Bit Up/Down Counters


    Original
    PDF HC192 HC193 HCT19 CD54/74HC192, CD54/74HC193, CD54/74HCT193 SCHS163D HC192, HC193 HCT193 CD54HC192 CD54HC193 HC192

    74HC193 74HCT193

    Abstract: CD54HC192F3A CD54HC193F3A HC192 HC193
    Text: [ /Title CD74 HC192 , CD74 HC193 , CD74 HCT19 3 /Subject (High Speed CMOS Logic Preset- CD54/74HC192, CD54/74HC193, CD54/74HCT193 Data sheet acquired from Harris Semiconductor SCHS163F September 1997 - Revised October 2003 High-Speed CMOS Logic Presettable Synchronous 4-Bit Up/Down Counters


    Original
    PDF HC192 HC193 HCT19 CD54/74HC192, CD54/74HC193, CD54/74HCT193 SCHS163F 74HC193 74HCT193 CD54HC192F3A CD54HC193F3A HC192 HC193

    Untitled

    Abstract: No abstract text available
    Text: [ /Title CD74 HC192 , CD74 HC193 , CD74 HCT19 3 /Subject (High Speed CMOS Logic Preset- CD54/74HC192, CD54/74HC193, CD54/74HCT193 Data sheet acquired from Harris Semiconductor SCHS163F September 1997 - Revised October 2003 High-Speed CMOS Logic Presettable Synchronous 4-Bit Up/Down Counters


    Original
    PDF CD54/74HC192, CD54/74HC193, CD54/74HCT193 SCHS163F

    SN74HC573DW

    Abstract: SN74HC573N CD74ACT00 SN74HC14D sn74hc14n datasheet CD74HC14M SN74HC74D HARRIS PACKAGE LOGIC hCT CD74HC125M SN74HC138D
    Text: TEXAS INSTRUMENTS Errata to Equivalent TI Die to be Used in Select CD74HC/HCT and CD74AC/ACT Devices March 30, 1999 Abstract Texas Instruments has determined select TI SN74HC/HCT and SN74AC/ACT devices that are equivalent to CD74HC/HCT and CD74AC/ACT devices in all data book parameters. Therefore, TI will


    Original
    PDF CD74HC/HCT CD74AC/ACT SN74HC/HCT SN74AC/ACT CD74AC/ACT ThisC32M96S2497 CD74AC32M96S5001 SN74HC573DW SN74HC573N CD74ACT00 SN74HC14D sn74hc14n datasheet CD74HC14M SN74HC74D HARRIS PACKAGE LOGIC hCT CD74HC125M SN74HC138D

    CD74HC14M

    Abstract: CD74HC00M 5354A SN74HC573DW CD74HC04M HARRIS PACKAGE LOGIC hCT SN74HC14D CD74HC125M SN74HC74D CD74HC74M
    Text: TEXAS INSTRUMENTS Equivalent TI Die to be Used in Select CD74HC/HCT and CD74AC/ACT Devices March 17, 1999 Abstract Texas Instruments has determined select TI SN74HC/HCT and SN74AC/ACT devices are equivalent to CD74HC/HCT and CD74AC/ACT devices in all data book parameters. Therefore, TI will


    Original
    PDF CD74HC/HCT CD74AC/ACT SN74HC/HCT SN74AC/ACT CD74HC/HCT. CD74AC/ACT. Cu6S2497 CD74AC32M96S5001 CD74HC14M CD74HC00M 5354A SN74HC573DW CD74HC04M HARRIS PACKAGE LOGIC hCT SN74HC14D CD74HC125M SN74HC74D CD74HC74M

    CD54HC192F3A

    Abstract: CD54HC193F3A HC192 HC193
    Text: [ /Title CD74 HC192 , CD74 HC193 , CD74 HCT19 3 /Subject (High Speed CMOS Logic Preset- CD54/74HC192, CD54/74HC193, CD54/74HCT193 Data sheet acquired from Harris Semiconductor SCHS163F September 1997 - Revised October 2003 High-Speed CMOS Logic Presettable Synchronous 4-Bit Up/Down Counters


    Original
    PDF HC192 HC193 HCT19 CD54/74HC192, CD54/74HC193, CD54/74HCT193 SCHS163F CD54HC192F3A CD54HC193F3A HC192 HC193

    Untitled

    Abstract: No abstract text available
    Text: [ /Title CD74 HC192 , CD74 HC193 , CD74 HCT19 3 /Subject (High Speed CMOS Logic Preset- CD54/74HC192, CD54/74HC193, CD54/74HCT193 Data sheet acquired from Harris Semiconductor SCHS163F September 1997 - Revised October 2003 High-Speed CMOS Logic Presettable Synchronous 4-Bit Up/Down Counters


    Original
    PDF HC192 HC193 HCT19 CD54/74HC192, CD54/74HC193, CD54/74HCT193 SCHS163F

    74HC193

    Abstract: CD54HC192 CD54HC193 HC192 HC193
    Text: [ /Title CD74 HC192 , CD74 HC193 , CD74 HCT19 3 /Subject (High Speed CMOS Logic Preset- CD54/74HC192, CD54/74HC193, CD54/74HCT193 Data sheet acquired from Harris Semiconductor SCHS163E September 1997 - Revised May 2003 High-Speed CMOS Logic Presettable Synchronous 4-Bit Up/Down Counters


    Original
    PDF HC192 HC193 HCT19 CD54/74HC192, CD54/74HC193, CD54/74HCT193 SCHS163E HC192, HC193 HCT193 74HC193 CD54HC192 CD54HC193 HC192

    HC193

    Abstract: CD54HC192F3A CD54HC193F3A HC192
    Text: [ /Title CD74 HC192 , CD74 HC193 , CD74 HCT19 3 /Subject (High Speed CMOS Logic Preset- CD54/74HC192, CD54/74HC193, CD54/74HCT193 Data sheet acquired from Harris Semiconductor SCHS163F September 1997 - Revised October 2003 High-Speed CMOS Logic Presettable Synchronous 4-Bit Up/Down Counters


    Original
    PDF HC192 HC193 HCT19 CD54/74HC192, CD54/74HC193, CD54/74HCT193 SCHS163F HC193 CD54HC192F3A CD54HC193F3A HC192

    IC - 74HC193

    Abstract: No abstract text available
    Text: [ /Title CD74 HC192 , CD74 HC193 , CD74 HCT19 3 /Subject (High Speed CMOS Logic Preset- CD54/74HC192, CD54/74HC193, CD54/74HCT193 Data sheet acquired from Harris Semiconductor SCHS163D September 1997 - Revised December 2002 High Speed CMOS Logic Presettable Synchronous 4-Bit Up/Down Counters


    Original
    PDF CD54/74HC192, CD54/74HC193, CD54/74HCT193 SCHS163D HC192, HC193 HCT193 IC - 74HC193

    CD54HC192F3A

    Abstract: CD54HC193F3A HC192 HC193
    Text: [ /Title CD74 HC192 , CD74 HC193 , CD74 HCT19 3 /Subject (High Speed CMOS Logic Preset- CD54/74HC192, CD54/74HC193, CD54/74HCT193 Data sheet acquired from Harris Semiconductor SCHS163F September 1997 - Revised October 2003 High-Speed CMOS Logic Presettable Synchronous 4-Bit Up/Down Counters


    Original
    PDF HC192 HC193 HCT19 CD54/74HC192, CD54/74HC193, CD54/74HCT193 SCHS163F CD54HC192F3A CD54HC193F3A HC192 HC193

    Untitled

    Abstract: No abstract text available
    Text: [ /Title CD74 HC192 , CD74 HC193 , CD74 HCT19 3 /Subject (High Speed CMOS Logic Preset- CD54/74HC192, CD54/74HC193, CD54/74HCT193 Data sheet acquired from Harris Semiconductor SCHS163F September 1997 - Revised October 2003 High-Speed CMOS Logic Presettable Synchronous 4-Bit Up/Down Counters


    Original
    PDF CD54/74HC192, CD54/74HC193, CD54/74HCT193 SCHS163F

    74HC193 74HCT193

    Abstract: 74HC192 IC 74HC192 CD54HC192F3A CD54HC193F3A HC192 HC193
    Text: [ /Title CD74 HC192 , CD74 HC193 , CD74 HCT19 3 /Subject (High Speed CMOS Logic Preset- CD54/74HC192, CD54/74HC193, CD54/74HCT193 Data sheet acquired from Harris Semiconductor SCHS163F September 1997 - Revised October 2003 High-Speed CMOS Logic Presettable Synchronous 4-Bit Up/Down Counters


    Original
    PDF HC192 HC193 HCT19 CD54/74HC192, CD54/74HC193, CD54/74HCT193 SCHS163F 74HC193 74HCT193 74HC192 IC 74HC192 CD54HC192F3A CD54HC193F3A HC192 HC193

    Untitled

    Abstract: No abstract text available
    Text: [ /Title CD74 HC192 , CD74 HC193 , CD74 HCT19 3 /Subject (High Speed CMOS Logic Preset- CD54/74HC192, CD54/74HC193, CD54/74HCT193 Data sheet acquired from Harris Semiconductor SCHS163F September 1997 - Revised October 2003 High-Speed CMOS Logic Presettable Synchronous 4-Bit Up/Down Counters


    Original
    PDF HC192 HC193 HCT19 CD54/74HC192, CD54/74HC193, CD54/74HCT193 SCHS163F

    Untitled

    Abstract: No abstract text available
    Text: [ /Title CD74 HC192 , CD74 HC193 , CD74 HCT19 3 /Subject (High Speed CMOS Logic Preset- CD54/74HC192, CD54/74HC193, CD54/74HCT193 Data sheet acquired from Harris Semiconductor SCHS163F September 1997 - Revised October 2003 High-Speed CMOS Logic Presettable Synchronous 4-Bit Up/Down Counters


    Original
    PDF CD54/74HC192, CD54/74HC193, CD54/74HCT193 SCHS163F

    74ls74apc

    Abstract: HD74ls04p 74LVC1G04ady8 semiconductor AZ431BZ-AE1 HCF4060BE HEF4093BP datasheet free download ne5334 hd74hc132p dm74ls47n
    Text: Standard Linear and Logic Products Cross-Reference Introduction Notice This Standard Linear and Logic Products CrossReference will assist in finding a device made by Texas Instruments that is a drop-in or similar replacement to many of our competitors’ standard linear and logic products.


    Original
    PDF