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

    74VHC Search Results

    74VHC Result Highlights (3)

    Part ECAD Model Manufacturer Description Download Buy
    74VHC08FT Toshiba Electronic Devices & Storage Corporation CMOS Logic IC, 2-Input/AND, TSSOP14B, -40 to 125 degC, AEC-Q100 Visit Toshiba Electronic Devices & Storage Corporation
    74VHCT541AFT Toshiba Electronic Devices & Storage Corporation CMOS Logic IC, Octal Buffer, TSSOP20B Visit Toshiba Electronic Devices & Storage Corporation
    74VHC541FT Toshiba Electronic Devices & Storage Corporation CMOS Logic IC, Octal Buffer, TSSOP20B Visit Toshiba Electronic Devices & Storage Corporation
    SF Impression Pixel

    74VHC Price and Stock

    onsemi MC74VHC1G125DBVT1G

    IC BUFFER NON-INVERT 5.5V SC74A
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey MC74VHC1G125DBVT1G Digi-Reel 17,822 1
    • 1 $0.27
    • 10 $0.156
    • 100 $0.0937
    • 1000 $0.05895
    • 10000 $0.05895
    Buy Now
    MC74VHC1G125DBVT1G Cut Tape 17,822 1
    • 1 $0.27
    • 10 $0.156
    • 100 $0.0937
    • 1000 $0.05895
    • 10000 $0.05895
    Buy Now
    MC74VHC1G125DBVT1G Reel 15,000 3,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.04832
    Buy Now
    Avnet Silica MC74VHC1G125DBVT1G 24,000 7 Weeks 3,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Buy Now
    New Advantage Corporation MC74VHC1G125DBVT1G 6,000 1
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.0363
    Buy Now

    Nexperia 74VHCT126BQ,115

    IC BUF NON-INVERT 5.5V 14DHVQFN
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey 74VHCT126BQ,115 Digi-Reel 5,000 1
    • 1 $0.54
    • 10 $0.383
    • 100 $0.2982
    • 1000 $0.2537
    • 10000 $0.2537
    Buy Now
    74VHCT126BQ,115 Cut Tape 5,000 1
    • 1 $0.54
    • 10 $0.383
    • 100 $0.2982
    • 1000 $0.2537
    • 10000 $0.2537
    Buy Now
    Avnet Asia 74VHCT126BQ,115 6,000 8 Weeks 3,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.21805
    Buy Now

    Nexperia 74VHC125PW,118

    IC BUF NON-INVERT 5.5V 14TSSOP
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey 74VHC125PW,118 Cut Tape 3,881 1
    • 1 $0.49
    • 10 $0.344
    • 100 $0.2665
    • 1000 $0.22614
    • 10000 $0.22614
    Buy Now
    74VHC125PW,118 Digi-Reel 3,881 1
    • 1 $0.49
    • 10 $0.344
    • 100 $0.2665
    • 1000 $0.22614
    • 10000 $0.22614
    Buy Now
    Rochester Electronics 74VHC125PW,118 127,500 1
    • 1 $0.1796
    • 10 $0.1796
    • 100 $0.1688
    • 1000 $0.1527
    • 10000 $0.1527
    Buy Now
    TME 74VHC125PW,118 1
    • 1 $0.539
    • 10 $0.437
    • 100 $0.303
    • 1000 $0.241
    • 10000 $0.241
    Get Quote

    onsemi MC74VHCT245ADWRG

    IC TXRX NON-INVERT 5.5V 20SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey MC74VHCT245ADWRG Cut Tape 1,899 1
    • 1 $1.89
    • 10 $1.171
    • 100 $0.7717
    • 1000 $0.6036
    • 10000 $0.6036
    Buy Now
    MC74VHCT245ADWRG Reel 1,000 1,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.54996
    • 10000 $0.45
    Buy Now
    TME MC74VHCT245ADWRG 1
    • 1 $1.395
    • 10 $0.839
    • 100 $0.586
    • 1000 $0.494
    • 10000 $0.494
    Get Quote
    Chip 1 Exchange MC74VHCT245ADWRG 3,653
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    Avnet Silica MC74VHCT245ADWRG 3,000 10 Weeks 1,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Buy Now
    New Advantage Corporation MC74VHCT245ADWRG 4,000 1
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.755
    • 10000 $0.6987
    Buy Now

    STMicroelectronics 74VHC594MTR

    IC SHIFT REGISTER 8BIT 16-SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey 74VHC594MTR Cut Tape 1,878 1
    • 1 $2.63
    • 10 $1.96
    • 100 $1.6078
    • 1000 $1.42301
    • 10000 $1.42301
    Buy Now
    74VHC594MTR Digi-Reel 1,878 1
    • 1 $2.63
    • 10 $1.96
    • 100 $1.6078
    • 1000 $1.42301
    • 10000 $1.42301
    Buy Now

    74VHC Datasheets (500)

    Part ECAD Model Manufacturer Description Curated Datasheet Type PDF
    74VHC00 Fairchild Semiconductor Quad 2-Input NAND Gate Original PDF
    74VHC00 STMicroelectronics QUAD 2-INPUT NAND GATE Original PDF
    74VHC00 STMicroelectronics QUAD 2-INPUT NAND GATE Original PDF
    74VHC00 STMicroelectronics QUAD 2-INPUT NAND GATE Original PDF
    74VHC00CW Fairchild Semiconductor Quad 2-Input NAND Gate Original PDF
    74VHC00FT Toshiba General Purpose Logic ICs Original PDF
    74VHC00M Fairchild Semiconductor Quad 2-Input NAND Gate Original PDF
    74VHC00M Fairchild Semiconductor Quad 2-Input NAND Gate; Package: SOIC; No of Pins: 14; Container: Rail Original PDF
    74VHC00M STMicroelectronics QUAD 2-INPUT NAND GATE Original PDF
    74VHC00M STMicroelectronics QUAD 2-INPUT NAND GATE Original PDF
    74VHC00M_NL Fairchild Semiconductor Quad 2-Input NAND Gate Original PDF
    74VHC00MSC National Semiconductor Quad 2-Input NAND Gate Original PDF
    74VHC00MSCX Fairchild Semiconductor Quad 2-Input NAND Gate Original PDF
    74VHC00MTC Fairchild Semiconductor Quad 2-Input NAND Gate; Package: TSSOP; No of Pins: 14; Container: Rail Original PDF
    74VHC00MTC Fairchild Semiconductor Quad 2-Input NAND Gate Original PDF
    74VHC00MTC National Semiconductor Quad 2-Input NAND Gate Original PDF
    74VHC00MTC_NL Fairchild Semiconductor Quad 2-Input NAND Gate Original PDF
    74VHC00MTCX Fairchild Semiconductor Quad 2-Input NAND Gate; Package: TSSOP; No of Pins: 14; Container: Tape & Reel Original PDF
    74VHC00MTCX Fairchild Semiconductor Quad 2-Input NAND Gate Original PDF
    74VHC00MTCX_NL Fairchild Semiconductor Quad 2-Input NAND Gate Original PDF
    ...

    74VHC Datasheets Context Search

    Catalog Datasheet MFG & Type Document Tags PDF

    Untitled

    Abstract: No abstract text available
    Text: 74VHC139 DUAL 2 TO 4 DECODER/DEMULTIPLEXER • ■ ■ HIGH SPEED: tPD = 5.0 ns TYP. at VCC = 5V LOW POWER DISSIPATION: ICC = 4 µA (MAX.) at TA=25°C HIGH NOISE IMMUNITY: VNIH = VNIL = 28% VCC (MIN.) POWER DOWN PROTECTION ON INPUTS SYMMETRICAL OUTPUT IMPEDANCE:


    Original
    74VHC139 74VHC139MTR 74VHC139TTR 74VHC139 PDF

    VHC 04

    Abstract: vhct04 74VHC04 74VHC04M 74VHC04MTC 74VHC04N 74VHC04SJ 74VHCT04 74VHCT04M 74VHCT04SJ
    Text: 74VHC0474VHCT04 Hex Inverter General Description Features The VHC/VHCT04 is an advanced high speed CMOS INVERTER fabricated with silicon gate CMOS technology. It achieves the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low power


    Original
    74VHC04 74VHCT04 VHC/VHCT04 VHC 04 vhct04 74VHC04 74VHC04M 74VHC04MTC 74VHC04N 74VHC04SJ 74VHCT04 74VHCT04M 74VHCT04SJ PDF

    74VHC244

    Abstract: 74vhc244 buffer ic top 246 yn 74VHC244M 74VHC244T
    Text: 74VHC244  OCTAL BUS BUFFER WITH 3 STATE OUTPUTS NON INVERTED • ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 3.9 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 4 µA (MAX.) at TA = 25 oC HIGH NOISE IMMUNITY: VNIH = VNIL = 28% VCC (MIN.)


    Original
    74VHC244 74VHC244 74vhc244 buffer ic top 246 yn 74VHC244M 74VHC244T PDF

    74VHC238

    Abstract: 74VHC238M 74VHC238MTR 74VHC238TTR PO13H TSSOP16
    Text: 74VHC238 3 TO 8 LINE DECODER • ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 5.5 ns TYP. at VCC = 5V LOW POWER DISSIPATION: ICC = 4 µA (MAX.) at TA=25°C HIGH NOISE IMMUNITY: VNIH = V NIL = 28% VCC (MIN.) POWER DOWN PROTECTION ON INPUTS SYMMETRICAL OUTPUT IMPEDANCE:


    Original
    74VHC238 74VHC238 74VHC238M 74VHC238MTR 74VHC238TTR PO13H TSSOP16 PDF

    74VHC16373

    Abstract: 74VHC16373TTR TSSOP48
    Text: 74VHC16373 16-BIT D-TYPE LATCH WITH 3-STATE OUTPUTS NON INVERTING • ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 5.0 ns TYP. at VCC = 5V LOW POWER DISSIPATION: ICC = 4 µA (MAX.) at TA=25°C HIGH NOISE IMMUNITY: VNIH = VNIL = 28% VCC (MIN.) POWER DOWN PROTECTION ON INPUTS


    Original
    74VHC16373 16-BIT 74VHC16373TTR 74VHC16373 74VHC16373TTR TSSOP48 PDF

    74VHC32

    Abstract: 74VHC32M 74VHC32MTR 74VHC32TTR TSSOP14
    Text: 74VHC32 QUAD 2-INPUT OR GATE • ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 3.8 ns TYP. at VCC = 5V LOW POWER DISSIPATION: ICC = 2 µA (MAX.) at TA=25°C HIGH NOISE IMMUNITY: VNIH = V NIL = 28% VCC (MIN.) POWER DOWN PROTECTION ON INPUTS SYMMETRICAL OUTPUT IMPEDANCE:


    Original
    74VHC32 74VHC32 74VHC32M 74VHC32MTR 74VHC32TTR TSSOP14 PDF

    74VHCT245A

    Abstract: 74VHCT245AM 74VHCT245AMTR 74VHCT245ATTR
    Text: 74VHCT245A OCTAL BUS TRANSCEIVER 3-STATE • ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 4.5 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 4 µA (MAX.) at TA=25°C COMPATIBLE WITH TTL OUTPUTS: VIH = 2V (MIN.), VIL = 0.8V (MAX) POWER DOWN PROTECTION ON INPUTS


    Original
    74VHCT245A 74VHCT245A 74VHCT245AM 74VHCT245AMTR 74VHCT245ATTR PDF

    74VHC20

    Abstract: 74VHC20M 74VHC20MTR 74VHC20TTR TSSOP14
    Text: 74VHC20 DUAL 4-INPUT NAND GATE • ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 3.3 ns TYP. at VCC = 5V LOW POWER DISSIPATION: ICC = 2 µA (MAX.) at TA=25°C HIGH NOISE IMMUNITY: VNIH = V NIL = 28% VCC (MIN.) POWER DOWN PROTECTION ON INPUTS SYMMETRICAL OUTPUT IMPEDANCE:


    Original
    74VHC20 74VHC20 74VHC20M 74VHC20MTR 74VHC20TTR TSSOP14 PDF

    74VHCT238A

    Abstract: 74VHCT238AM 74VHCT238AMTR 74VHCT238ATTR PO13H TSSOP16
    Text: 74VHCT238A 3 TO 8 LINE DECODER • ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 5.5 ns TYP. at VCC = 5V LOW POWER DISSIPATION: ICC = 4 µA (MAX.) at TA=25°C COMPATIBLE WITH TTL OUTPUTS: VIH = 2V (MIN.), VIL = 0.8V (MAX) POWER DOWN PROTECTION ON INPUTS


    Original
    74VHCT238A 74VHCT238A 74VHCT238AM 74VHCT238AMTR 74VHCT238ATTR PO13H TSSOP16 PDF

    74VHCT86A

    Abstract: 74VHCT86AM 74VHCT86AMTR 74VHCT86ATTR TSSOP14
    Text: 74VHCT86A QUAD EXCLUSIVE OR GATE • ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 5.5ns TYP. at VCC = 5V LOW POWER DISSIPATION: ICC = 2 µA (MAX.) at TA=25°C COMPATIBLE WITH TTL OUTPUTS: VIH = 2V (MIN.), VIL = 0.8V (MAX) POWER DOWN PROTECTION ON INPUTS


    Original
    74VHCT86A 74VHCT86A 74VHCT86AM 74VHCT86AMTR 74VHCT86ATTR TSSOP14 PDF

    74VHCT08A

    Abstract: 74VHCT08AM 74VHCT08AMTR 74VHCT08ATTR TSSOP14
    Text: 74VHCT08A QUAD 2-INPUT AND GATE • ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 4.7 ns TYP. at VCC = 5V LOW POWER DISSIPATION: ICC = 2 µA (MAX.) at TA=25°C COMPATIBLE WITH TTL OUTPUTS: VIH = 2V (MIN.), VIL = 0.8V (MAX) POWER DOWN PROTECTION ON INPUTS


    Original
    74VHCT08A 74VHCT08A 74VHCT08AM 74VHCT08AMTR 74VHCT08ATTR TSSOP14 PDF

    74VHC573

    Abstract: 74VHC573M 74VHC573MTR 74VHC573TTR
    Text: 74VHC573 OCTAL D-TYPE LATCH WITH 3 STATE OUTPUTS NON INVERTING • ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 5.0 ns TYP. at VCC = 5V LOW POWER DISSIPATION: ICC = 4 µA (MAX.) at TA=25°C HIGH NOISE IMMUNITY: VNIH = VNIL = 28% VCC (MIN.) POWER DOWN PROTECTION ON INPUTS


    Original
    74VHC573 74VHC573 74VHC573M 74VHC573MTR 74VHC573TTR PDF

    74VHCT16244A

    Abstract: 74VHCT16244ATTR TSSOP48
    Text: 74VHCT16244A 16-BIT BUS BUFFER WITH 3-STATE OUTPUTS NON INVERTED • ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 5.4 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 4 µA (MAX.) at TA=25°C COMPATIBLE WITH TTL OUTPUTS: VIH =2V (MIN.) VIL = 0.8 (MAX.)


    Original
    74VHCT16244A 16-BIT 74VHCT16244ATTR 74VHCT16244A 74VHCT16244ATTR TSSOP48 PDF

    Untitled

    Abstract: No abstract text available
    Text: 74VHC165FT CMOS Digital Integrated Circuits Silicon Monolithic 74VHC165FT 1. Functional Description • 8-Bit Shift Register P-IN, S-OUT 2. General The 74VHC165FT is an advanced high speed CMOS 8-BIT PARALLEL/SERIAL-IN, SERIAL-OUT SHIFT REGISTER fabricated with silicon gate C2MOS technology.


    Original
    74VHC165FT 74VHC165FT PDF

    74VHC594

    Abstract: M74VHC594TTR PO13H TSSOP16
    Text: 74VHC594 8 BIT SHIFT REGISTER WITH OUTPUT REGISTER • ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 4.2ns TYP. at VCC = 5V LOW POWER DISSIPATION: ICC = 4 µA (MAX.) at TA=25°C HIGH NOISE IMMUNITY: VNIH = VNIL = 28% VCC (MIN.) POWER DOWN PROTECTION ON INPUTS


    Original
    74VHC594 74VHC594 M74VHC594TTR PO13H TSSOP16 PDF

    74VHC157

    Abstract: 74VHC157M 74VHC157MTR 74VHC157TTR PO13H TSSOP16
    Text: 74VHC157 QUAD 2 CHANNEL MULTIPLEXER • ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 4.1 ns TYP. at VCC = 5V LOW POWER DISSIPATION: ICC = 4 µA (MAX.) at TA=25°C HIGH NOISE IMMUNITY: VNIH = V NIL = 28% VCC (MIN.) POWER DOWN PROTECTION ON INPUTS


    Original
    74VHC157 74VHC157 74VHC157M 74VHC157MTR 74VHC157TTR PO13H TSSOP16 PDF

    74VHC02

    Abstract: 74VHC02M 74VHC02MTR 74VHC02TTR TSSOP14
    Text: 74VHC02 QUAD 2-INPUT NOR GATE • ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 3.6ns TYP. at VCC = 5V LOW POWER DISSIPATION: ICC = 2 µA (MAX.) at TA=25°C HIGH NOISE IMMUNITY: VNIH = V NIL = 28% VCC (MIN.) POWER DOWN PROTECTION ON INPUTS SYMMETRICAL OUTPUT IMPEDANCE:


    Original
    74VHC02 74VHC02 74VHC02M 74VHC02MTR 74VHC02TTR TSSOP14 PDF

    74VHC04

    Abstract: 74VHC14 74VHCT14A 74VHCT14AM 74VHCT14AMTR 74VHCT14ATTR TSSOP14
    Text: 74VHCT14A HEX SCHMITT INVERTER • ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 5.5 ns TYP. at VCC = 5V LOW POWER DISSIPATION: ICC = 2 µA (MAX.) at TA=25°C TYPICAL HYSTERESIS : 0.7V at VCC = 4.5V POWER DOWN PROTECTION ON INPUTS & OUTPUTS SYMMETRICAL OUTPUT IMPEDANCE:


    Original
    74VHCT14A 74VHCT14A 74VHC04 74VHC14 74VHCT14AM 74VHCT14AMTR 74VHCT14ATTR TSSOP14 PDF

    74VHC04

    Abstract: 74VHC04M 74VHC04MTR 74VHC04TTR TSSOP14
    Text: 74VHC04 HEX INVERTER • ■ ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 3.8ns TYP. at VCC = 5V LOW POWER DISSIPATION: ICC = 2 µA (MAX.) at TA=25°C HIGH NOISE IMMUNITY: VNIH = V NIL = 28% VCC (MIN.) POWER DOWN PROTECTION ON INPUTS SYMMETRICAL OUTPUT IMPEDANCE:


    Original
    74VHC04 74VHC04 74VHC04M 74VHC04MTR 74VHC04TTR TSSOP14 PDF

    VHC32

    Abstract: 74HC32 74VHC32 74VHC32M 74VHC32MTC 74VHC32MTCX 74VHC32MX 74VHC32N 74VHC32SJ M14A
    Text: Revised February 2005 74VHC32 Quad 2-Input OR Gate General Description Features The VHC32 is an advanced high speed CMOS 2-Input OR Gate fabricated with silicon gate CMOS technology. It achieves the high speed operation similar to equivalent Bipolar Schottky TTL while maintaining the CMOS low


    Original
    74VHC32 VHC32 74HC32 74VHC32 74VHC32M 74VHC32MTC 74VHC32MTCX 74VHC32MX 74VHC32N 74VHC32SJ M14A PDF

    74HC4066

    Abstract: 74VHC 74VHC4066 74VHC4066M 74VHC4066MTC 74VHC4066N 74VHC4066WM M14A M14B MTC14
    Text: Revised April 1999 74VHC4066 Quad Analog Switch General Description These devices are digitally controlled analog switches utilizing advanced silicon-gate CMOS technology. These switches have low “on” resistance and low “off” leakages. They are bidirectional switches, thus any analog input may


    Original
    74VHC4066 74VHC4066 74HC4066 74VHC 74VHC4066M 74VHC4066MTC 74VHC4066N 74VHC4066WM M14A M14B MTC14 PDF

    74VHC16240

    Abstract: 74VHC16240TTR TSSOP48
    Text: 74VHC16240 16-BIT BUS BUFFER WITH 3-STATE OUTPUTS INVERTED • ■ ■ ■ ■ ■ ■ ■ ■ HIGH SPEED: tPD = 5.3 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 4 µA (MAX.) at TA=25°C HIGH NOISE IMMUNITY VNIH=VNIL= 28% VCC (MIN.) POWER DOWN PROTECTION ON INPUTS


    Original
    74VHC16240 16-BIT 74VHC16240TTR 74VHC16240 74VHC16240TTR TSSOP48 PDF

    VHCT244

    Abstract: 74HC buffer tri-state output 74VHC244 74VHC244M 74VHC244MSC 74VHC244MTC 74VHC244SJ 74VHCT244 M20D
    Text: 9 io .et N a t i o n a l S e m i c o n d u c t o r 74VHC24474VHCT244 Octal Buffer/Line Driver with TRI-STATE Outputs General Description Features The ’V H C /’VHCT244 is an advanced high speed CMOS oc­ tal bus buffer fabricated with silicon gate C2MOS technolo­


    OCR Scan
    74VHC244 74VHCT244 VHCT244 74HC buffer tri-state output 74VHC244 74VHC244M 74VHC244MSC 74VHC244MTC 74VHC244SJ M20D PDF

    I12W

    Abstract: 3.5795 crystal power line carrier communication dc 74VHC 74VHC943 audio FSK modulator and Demodulator
    Text: June 1994 74VHC943 300 Baud Modem General Description Features The 74VHC943 is a full duplex low speed modem. It pro­ vides a 300 baud bidirectional serial interface for data com­ munication over telephone lines and other narrow band­ width channels. It is Bell 103 compatible.


    OCR Scan
    74VHC943 Cap41451. bS0112M DD1QG31 I12W 3.5795 crystal power line carrier communication dc 74VHC audio FSK modulator and Demodulator PDF