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

    TBR24 Search Results

    TBR24 Result Highlights (2)

    Part ECAD Model Manufacturer Description Download Buy
    DF2215TBR24V Renesas Electronics Corporation Microcontrollers for Mobile Device Applications (Non Promotion) Visit Renesas Electronics Corporation
    DF2215TBR24WV Renesas Electronics Corporation Microcontrollers for Mobile Device Applications (Non Promotion) Visit Renesas Electronics Corporation
    SF Impression Pixel

    TBR24 Price and Stock

    KEMET Corporation FC0H224ZFTBR24

    CAP 220MF -20% +80% 5.5V SMD
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey FC0H224ZFTBR24 Reel 15,500 500
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.46857
    • 10000 $1.32159
    Buy Now
    Avnet Americas FC0H224ZFTBR24 Reel 500
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.27956
    • 10000 $1.2125
    Buy Now
    Newark FC0H224ZFTBR24 Cut Tape 16,855 1
    • 1 $3.44
    • 10 $2.52
    • 100 $1.9
    • 1000 $1.61
    • 10000 $1.61
    Buy Now
    RS FC0H224ZFTBR24 Bulk 1
    • 1 $3
    • 10 $2.7
    • 100 $2.55
    • 1000 $2.55
    • 10000 $2.55
    Get Quote
    Bristol Electronics FC0H224ZFTBR24 4,478
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    TME FC0H224ZFTBR24 301 1
    • 1 $2.98
    • 10 $2.01
    • 100 $1.14
    • 1000 $1.12
    • 10000 $1.12
    Buy Now
    Avnet Abacus FC0H224ZFTBR24 Reel 2,000 25 Weeks 500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Buy Now
    Avnet Asia FC0H224ZFTBR24 500
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.43319
    • 10000 $1.35776
    Buy Now
    Chip Stock FC0H224ZFTBR24 72,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    Win Source Electronics FC0H224ZFTBR24 57,142
    • 1 -
    • 10 -
    • 100 $1.557
    • 1000 $1.3058
    • 10000 $1.3058
    Buy Now

    KEMET Corporation FCS0V104ZFTBR24

    CAP 100MF -20% +80% 3.5V SMD
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey FCS0V104ZFTBR24 Digi-Reel 10,012 1
    • 1 $4.55
    • 10 $3.054
    • 100 $2.2577
    • 1000 $1.9339
    • 10000 $1.9339
    Buy Now
    FCS0V104ZFTBR24 Cut Tape 10,012 1
    • 1 $4.55
    • 10 $3.054
    • 100 $2.2577
    • 1000 $1.9339
    • 10000 $1.9339
    Buy Now
    FCS0V104ZFTBR24 Reel 10,000 1,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.83553
    • 10000 $1.66136
    Buy Now
    Newark FCS0V104ZFTBR24 Cut Tape 3,685 1
    • 1 $3.61
    • 10 $2.75
    • 100 $2.18
    • 1000 $1.96
    • 10000 $1.96
    Buy Now
    FCS0V104ZFTBR24 Reel 1,000
    • 1 $2.18
    • 10 $2.18
    • 100 $2.18
    • 1000 $2.18
    • 10000 $1.79
    Buy Now
    Bristol Electronics FCS0V104ZFTBR24 69
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    Ameya Holding Limited FCS0V104ZFTBR24 20,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    Avnet Abacus FCS0V104ZFTBR24 Reel 25 Weeks 1,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Buy Now
    Chip-Germany GmbH FCS0V104ZFTBR24 89
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote

    KEMET Corporation FCS0V474ZFTBR24

    CAP 470MF -20% +80% 3.5V SMD
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey FCS0V474ZFTBR24 Reel 9,500 500
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.70375
    • 10000 $1.53916
    Buy Now
    Avnet Americas FCS0V474ZFTBR24 Reel 42 Weeks, 1 Days 500
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.50487
    • 10000 $1.39563
    Buy Now
    Newark FCS0V474ZFTBR24 Cut Tape 27,784 1
    • 1 $4.17
    • 10 $2.97
    • 100 $2.19
    • 1000 $1.87
    • 10000 $1.87
    Buy Now
    Avnet Abacus FCS0V474ZFTBR24 Reel 148,500 25 Weeks 500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Buy Now
    Avnet Asia FCS0V474ZFTBR24 2,500 500
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.68556
    • 10000 $1.59684
    Buy Now

    KEMET Corporation FC0H473ZFTBR24

    CAP 47MF -20% +80% 5.5V SMD
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey FC0H473ZFTBR24 Reel 8,000 1,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.13454
    • 10000 $0.97608
    Buy Now
    Avnet Americas FC0H473ZFTBR24 Reel 155,000 42 Weeks, 1 Days 1,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.98743
    • 10000 $0.90162
    Buy Now
    Newark FC0H473ZFTBR24 Cut Tape 7,478 1
    • 1 $3.07
    • 10 $2.06
    • 100 $1.49
    • 1000 $1.26
    • 10000 $1.26
    Buy Now
    RS FC0H473ZFTBR24 Bulk 20
    • 1 -
    • 10 -
    • 100 $2.26
    • 1000 $2.26
    • 10000 $2.26
    Get Quote
    TME FC0H473ZFTBR24 641 1
    • 1 $1.97
    • 10 $1.5
    • 100 $1.24
    • 1000 $0.98
    • 10000 $0.98
    Buy Now
    Avnet Abacus FC0H473ZFTBR24 Reel 25 Weeks 1,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Buy Now
    Avnet Asia FC0H473ZFTBR24 1,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.09507
    • 10000 $1.02303
    Buy Now
    Chip-Germany GmbH FC0H473ZFTBR24 18
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    Chip1Stop FC0H473ZFTBR24 Cut Tape 901
    • 1 $2.41
    • 10 $1.58
    • 100 $1.14
    • 1000 $0.962
    • 10000 $0.962
    Buy Now

    KEMET Corporation FC0H104ZFTBR24

    CAP 100MF -20% +80% 5.5V SMD
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey FC0H104ZFTBR24 Reel 3,000 1,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.40093
    • 10000 $1.23653
    Buy Now
    Avnet Americas FC0H104ZFTBR24 Reel 3,000 42 Weeks, 1 Days 1,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.2446
    • 10000 $1.1446
    Buy Now
    Newark FC0H104ZFTBR24 Cut Tape 5,830 1
    • 1 $3.47
    • 10 $2.35
    • 100 $1.82
    • 1000 $1.55
    • 10000 $1.55
    Buy Now
    FC0H104ZFTBR24 Reel 1,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.59
    • 10000 $1.26
    Buy Now
    RS FC0H104ZFTBR24 Bulk 114 52 Weeks 1
    • 1 $2.85
    • 10 $2.57
    • 100 $2.42
    • 1000 $2.42
    • 10000 $2.42
    Buy Now
    TME FC0H104ZFTBR24 2,454 1
    • 1 $3
    • 10 $1.9
    • 100 $1.33
    • 1000 $1.19
    • 10000 $1.19
    Buy Now
    Avnet Abacus FC0H104ZFTBR24 Reel 27,000 25 Weeks 1,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Buy Now
    Avnet Asia FC0H104ZFTBR24 1,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.38028
    • 10000 $1.28947
    Buy Now

    TBR24 Datasheets Context Search

    Catalog Datasheet MFG & Type Document Tags PDF

    CR21

    Abstract: GR-499-CORE TBR24 XRT71D00 XRT7300 XRT7302 XRT73L03 role of microprocessor
    Text:  XRT71D00 PRELIMINARY DS3/E3 JITTER ATTENUATOR IC OCTOBER 1999 REV. 1.0.6 FEATURES • Meets output jitter generation requirement as spec- ified by ETSI TBR24 • A single-chip that does the following: • Accepts “jittery” clock and data from an LIU IC


    Original
    XRT71D00 TBR24 TBR24 34Mbit/s XRT71D00ID XRT71D00IQ32 CR21 GR-499-CORE XRT71D00 XRT7300 XRT7302 XRT73L03 role of microprocessor PDF

    HDB3 matlab

    Abstract: block diagram prbs generator in matlab matlab pn sequence generator HP54502A
    Text: DART Device Advanced E3/DS3 Receiver/Transmitter TXC-02030 FEATURES DESCRIPTION • Single LIU for E3 and DS3 The Dual-market Advanced E3/DS3 Receiver/Transmitter DART device performs the receive and transmit line interface functions required for transmission of E3


    Original
    TXC-02030 TXC-02030-MB HDB3 matlab block diagram prbs generator in matlab matlab pn sequence generator HP54502A PDF

    TIC126 equivalent

    Abstract: BCR40 93C46 AM79C978A PC99 of finite state machine AM79C901A
    Text: Am79C978A PCnet - Home Single-Chip 1/10 Mbps PCI Home Networking Controller DISTINCTIVE CHARACTERISTICS n Fully integrated 1 Mbps HomePNA Physical Layer PHY as defined by Home Phoneline Networking Alliance (HomePNA) specification 1.1 — Optimized for home networking applications


    Original
    Am79C978A Index-10 TIC126 equivalent BCR40 93C46 PC99 of finite state machine AM79C901A PDF

    CX28331

    Abstract: CX28332 CX28333 TBR24 48-ETQFP AMI 52 732 V
    Text: Single/Dual/Triple E3/DS3/STS-1 Line Interface Unit Data Sheet CX28331/CX28332/CX28333 –3x 28333-DSH-002-B Feb 2003 Revision History Revision Level Date Description A — 6/2001 Initial Release [Document number 28333-DSH-002-A] B — 2/2003 Removed CX2833i-1x information (see separate document)


    Original
    CX28331/CX28332/CX28333 28333-DSH-002-B 28333-DSH-002-A] CX2833i-1x 00371A CX28331 CX28332 CX28333 TBR24 48-ETQFP AMI 52 732 V PDF

    AM79C901A

    Abstract: 79C901 TIC106
    Text: PRELIMINARY Am79C901A HomePHY Single-Chip 1/10 Mbps Home Networking PHY DISTINCTIVE CHARACTERISTICS n Fully integrated 1 Mbps HomePNA Physical Layer PHY as defined by Home Phoneline Networking Alliance (HomePNA) specification 1.1 — Optimized for home networking applications


    Original
    Am79C901A RLL25 22304C 79C901 TIC106 PDF

    yx 801

    Abstract: yx 801 led yx 801 led driver BCR40 IC yx 801 led driver yx 801 led pl 93C46 PC97 PQL144 PQR160
    Text: Am79C978 PCnet - Home Single-Chip 1/10 Mbps PCI Home Networking Controller DISTINCTIVE CHARACTERISTICS n Fully integrated 1 Mbps HomePNA Physical Layer PHY as defined by Home Phoneline Networking Alliance (HomePNA) specification 1.1 — Supports both PCI 5.0-V and 3.3-V signaling


    Original
    Am79C978 yx 801 yx 801 led yx 801 led driver BCR40 IC yx 801 led driver yx 801 led pl 93C46 PC97 PQL144 PQR160 PDF

    ANSI T1.102

    Abstract: 728A filter EASY3452 GR-499-CORE pulse shaper QUADLIU - PEB 22504
    Text: P R O D U C T B R I E F DS3/STS-1/E3 Line Interface Unit The TE3-LIU former PUCCINI; PEB 3452 is a DS3 / STS-1 / E3 Line Interface Unit. It interfaces DS3 / STS-1 / E3 framer device to the analog transmission line. It fulfills the relevant standards for DS3 (44.736 Mbit/s), STS-1 (51.840 Mbit/s) and


    Original
    B119-H7614-G1-X-7600 ANSI T1.102 728A filter EASY3452 GR-499-CORE pulse shaper QUADLIU - PEB 22504 PDF

    75l00d

    Abstract: No abstract text available
    Text: áç XRT75L00D E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER NOVEMBER 2003 REV. 1.0.1 • On-chip clock synthesizer provides the appropriate GENERAL DESCRIPTION The XRT75L00D is a single-channel fully integrated Line Interface Unit LIU with Sonet Desynchronizer


    Original
    XRT75L00D XRT75L00D 75l00d PDF

    Untitled

    Abstract: No abstract text available
    Text: XRT75L04 xr FOUR CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR JANUARY 2006 GENERAL DESCRIPTION The XRT75L04 is a four-channel fully integrated Line Interface Unit LIU with Jitter Attenuator for E3/DS3/ STS-1 applications. It incorporates four independent


    Original
    XRT75L04 XRT75L04 PDF

    Untitled

    Abstract: No abstract text available
    Text: xr PRELIMINARY XRT79L71 1-CHANNEL DS3/E3 ATM UNI/PPP/CLEAR-CHANNEL FRAMER IC - CC/HDLC ARCHITECTURAL DESCRIPTION NOVEMBER 2005 GENERAL DESCRIPTION The XRT79L71 is a single channel, ATM UNI/PPP Physical Layer Processor with integrated DS3/E3 framing controller and Line Interface Unit with Jitter


    Original
    XRT79L71 XRT79L71 PDF

    Untitled

    Abstract: No abstract text available
    Text: áç XRT71D04 PRELIMINARY 4 CHANNEL E3/DS3/STS-1 JITTER ATTENUATOR, STS-1 TO DS3 DESYNCHRONIZER DECEMBER 2000 REV. P1.0.2 GENERAL DESCRIPTION The XRT71D04 is a four channel, single chip Jitter Attenuator, that meets the Jitter transfer characteristic requirements specified in the ETSI TBR-24, Bellcore


    Original
    XRT71D04 XRT71D04 TBR-24, GR-499 GR-253 PDF

    Untitled

    Abstract: No abstract text available
    Text: áç XRT71D03 PRELIMINARY 3 CHANNEL E3/DS3/STS-1 JITTER ATTENUATOR, STS-1 TO DS3 DESYNCHRONIZER DECEMBER 2000 REV. P1.0.2 GENERAL DESCRIPTION The XRT71D03 is a three channel, single chip Jitter Attenuator, that meets the Jitter transfer characteristics requirements specified in the ETSI TBR-24,


    Original
    XRT71D03 XRT71D03 TBR-24, GR-499 GR-253 755oration PDF

    34.368Mhz oscillator

    Abstract: chn 543
    Text: XRT75L03 THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR JULY 2003 GENERAL DESCRIPTION The XRT75L03 is a three-channel fully integrated Line Interface Unit LIU with Jitter Attenuator for E3/ DS3/STS-1 applications. It incorporates 3


    Original
    XRT75L03 XRT75L03 34.368Mhz oscillator chn 543 PDF

    chn 923

    Abstract: No abstract text available
    Text: xr XRT75R03 THREE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR MARCH 2005 REV. 1.0.7 GENERAL DESCRIPTION TRANSMITTER: The XRT75R03 is a three-channel fully integrated Line Interface Unit LIU featuring EXAR’s R3 Technology (Reconfigurable, Relayless Redundancy)


    Original
    XRT75R03 XRT75R03 chn 923 PDF

    M28335-13P

    Abstract: M28335 ferrite RM6 CX28365 M28335EBGC TBR24 DIMENSIONAL STANDARD AH31 AK20 ferrite e16 ferrite transformer ch9i
    Text: Preliminary Information This document contains information on a new product. The parametric information, although not fully characterized, is the result of testing initial devices. M28335 Twelve Port T3/E3/STS-1 Line Interface Unit The M28335 is a 12-channel, T3/E3/STS-1 Line Interface Unit LIU . It is configured via a


    Original
    M28335 M28335 12-channel, GR253, TA-NWT-000253) TR-TSY-000191, TBR24 TBR25 TR54014, M28335-13P ferrite RM6 CX28365 M28335EBGC DIMENSIONAL STANDARD AH31 AK20 ferrite e16 ferrite transformer ch9i PDF

    DMO11

    Abstract: DMO10 0X00 GR-253 GR-499-CORE XRT73R12 XRT73R12IB em7 120 cc11r
    Text: XRT73R12 PRELIMINARY TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT OCTOBER 2003 REV. P1.0.3 GENERAL DESCRIPTION The XRT73R12 provides a Parallel Microprocessor Interface for programming and control. The XRT73R12 is a twelve channel fully integrated Line Interface Unit LIU featuring EXAR’s R3


    Original
    XRT73R12 XRT73R12 DMO11 DMO10 0X00 GR-253 GR-499-CORE XRT73R12IB em7 120 cc11r PDF

    ATM timing diagram

    Abstract: addressing mode motorola 68000 hdlc LAN switch with HDLC GR-253 GR-499-CORE PC403 XRT79L74 XRT79L74IB
    Text: PRELIMINARY XRT79L74 4 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC MARCH 2004 HARDWARE MANUAL The XRT79L74 is a four channel, ATM UNI/PPP Physical Layer Processor with integrated DS3/E3 framing controllers and Line Interface Units with Jitter Attenuators that are designed to support ATM direct


    Original
    XRT79L74 XRT79L74 ATM timing diagram addressing mode motorola 68000 hdlc LAN switch with HDLC GR-253 GR-499-CORE PC403 XRT79L74IB PDF

    chn 834

    Abstract: CHN 833 CR69 0X00 GR-253 GR-499-CORE XRT75R12D XRT75R12DIB CHN 703 GR-253 J0 byte length 14
    Text: XRT75R12D TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DECEMBER 2006 REV. 1.0.1 GENERAL DESCRIPTION The XRT75R12D is a twelve channel fully integrated Line Interface Unit LIU featuring EXAR’s R3 Technology (Reconfigurable, Relayless Redundancy)


    Original
    XRT75R12D XRT75R12D chn 834 CHN 833 CR69 0X00 GR-253 GR-499-CORE XRT75R12DIB CHN 703 GR-253 J0 byte length 14 PDF

    CHN 703

    Abstract: diode ja8 75R12 AS11D eh3 encoder DMO10 DMO11 JA8R GR-253 GR-499-CORE
    Text: XRT75R12 PRELIMINARY TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER ATTENUATOR OCTOBER 2003 REV. P1.0.2 GENERAL DESCRIPTION attenuator performance meets the ETSI TBR-24 and Bellcore GR-499 specifications. The XRT75R12 is a twelve channel fully integrated


    Original
    XRT75R12 TBR-24 GR-499 XRT75R12 CHN 703 diode ja8 75R12 AS11D eh3 encoder DMO10 DMO11 JA8R GR-253 GR-499-CORE PDF

    hdlc

    Abstract: IBM POS GR-253 GR-499-CORE PC403 XRT79L72 XRT79L72IB
    Text: xr PRELIMINARY XRT79L72 2 - CHANNEL DS3/E3 ATM UNI/PPP COMBO IC FEBRUARY 2005 HARDWARE MANUAL The XRT79L72 is a two channel, ATM UNI/PPP Physical Layer Processor with integrated DS3/E3 framing controllers and Line Interface Units with Jitter Attenuators that are designed to support ATM direct


    Original
    XRT79L72 XRT79L72 hdlc IBM POS GR-253 GR-499-CORE PC403 XRT79L72IB PDF

    HDB3 CODING DECODING FPGA

    Abstract: chn 834 chn 832 R13C7 CHN 833 GR-253 GR-253-CORE GR-499-CORE XRT75R06D FPGA AMI coding decoding
    Text: áç XRT75R06D SIX CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH SONET DESYNCHRONIZER DECEMBER 2004 REV. 1.0.0 GENERAL DESCRIPTION The XRT75R06D is a six channel fully integrated Line Interface Unit LIU featuring EXAR’s R3 Technology (Reconfigurable, Relayless, Redundancy) for E3/


    Original
    XRT75R06D XRT75R06D HDB3 CODING DECODING FPGA chn 834 chn 832 R13C7 CHN 833 GR-253 GR-253-CORE GR-499-CORE FPGA AMI coding decoding PDF

    TXN612

    Abstract: MT 8222 t1e8 AMI 8531
    Text: + DS32506/DS32508/DS32512 6-/8-/12-Port DS3/E3/STS-1 LIU www.maxim-ic.com FEATURES GENERAL DESCRIPTION Pin-Compatible Family of Products Each Port Independently Configurable Receive Clock and Data Recovery for Up to 457 meters 1500 feet of 75Ω Coaxial Cable


    Original
    DS32506/DS32508/DS32512 6-/8-/12-Port DS32506 DS32508 DS32512 DS32512, DS32508, DS32506 TXN612 MT 8222 t1e8 AMI 8531 PDF

    tokin 0.47f 5.5v

    Abstract: NEC tokin 0,22F tokin 108 tokin 473
    Text: FC Series Features Dimensions • Enables surface mounting. D ± 0.5 • High rated voltage of 5.5V. • High reliability solution leakage. H Max. L Applications B ± 0.2 • Subsidiary power supply. Buck up power supply line. A ± 0.2 Memory backup during battery exchange.


    Original
    FC0H473ZFTBR24 FC0H104ZFTBR24 FC0H224ZFTBR24 FC0V104ZFTBR24 FC0V224ZFTBR24 FC0V474ZFTBR24 FC0V683ZFTBR16 FC0H474ZFTBR32 FC0H105ZFTBR44 L5-001 tokin 0.47f 5.5v NEC tokin 0,22F tokin 108 tokin 473 PDF

    Untitled

    Abstract: No abstract text available
    Text: PRELIM INARY AMDH Am79C901 HomePHY Single-Chip 1/10 Mbps Home Networking PHY DISTINCTIVE CHARACTERISTICS Fully in tegrated 1 M bps H om ePNA Physical Layer PHY as defined by Hom e Phoneline N etw orking A llian ce (H om ePN A ) s p ecificatio n 1.1 — Optimized for home networking applications


    OCR Scan
    Am79C901 10BASE-T PDF