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

    SN74ALS520DW Search Results

    SN74ALS520DW Result Highlights (1)

    Part ECAD Model Manufacturer Description Download Buy
    SN74ALS520DW Texas Instruments 8-Bit Identity Comparators (P=Q) with Enable and 20K Ohm Q-Input Pullup Resistors 20-SOIC 0 to 70 Visit Texas Instruments Buy
    SF Impression Pixel

    SN74ALS520DW Price and Stock

    Texas Instruments SN74ALS520DW

    IC COMPARATOR IDENTITY 8B 20SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74ALS520DW Tube 318 1
    • 1 $2.78
    • 10 $2.074
    • 100 $1.704
    • 1000 $1.51001
    • 10000 $1.43241
    Buy Now
    Mouser Electronics SN74ALS520DW 308
    • 1 $2.45
    • 10 $1.67
    • 100 $1.49
    • 1000 $1.31
    • 10000 $1.28
    Buy Now
    Verical SN74ALS520DW 1,875 216
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.575
    • 10000 $1.575
    Buy Now
    SN74ALS520DW 475 216
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.575
    • 10000 $1.575
    Buy Now
    Bristol Electronics SN74ALS520DW 306
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    SN74ALS520DW 250
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    Quest Components SN74ALS520DW 3,267
    • 1 $3.45
    • 10 $3.45
    • 100 $3.45
    • 1000 $1.2938
    • 10000 $1.2938
    Buy Now
    SN74ALS520DW 200
    • 1 $3.45
    • 10 $3.45
    • 100 $1.725
    • 1000 $1.5956
    • 10000 $1.5956
    Buy Now
    SN74ALS520DW 140
    • 1 $3.45
    • 10 $3.45
    • 100 $1.725
    • 1000 $1.725
    • 10000 $1.725
    Buy Now
    SN74ALS520DW 54
    • 1 $2.1563
    • 10 $2.1563
    • 100 $1.2938
    • 1000 $1.2938
    • 10000 $1.2938
    Buy Now
    SN74ALS520DW 10
    • 1 $2.2865
    • 10 $1.8292
    • 100 $1.8292
    • 1000 $1.8292
    • 10000 $1.8292
    Buy Now
    Rochester Electronics SN74ALS520DW 2,585 1
    • 1 $1.48
    • 10 $1.48
    • 100 $1.39
    • 1000 $1.26
    • 10000 $1.26
    Buy Now
    ComSIT USA SN74ALS520DW 4
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote

    Rochester Electronics LLC SN74ALS520DW

    SN74ALS520 8-BIT IDENTITY COMPAR
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74ALS520DW Bulk 226
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.33
    • 10000 $1.33
    Buy Now

    Texas Instruments SN74ALS520DWR

    IC COMPARATOR IDENTITY 8B 20SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74ALS520DWR Reel 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.93392
    Buy Now
    Bristol Electronics SN74ALS520DWR 92
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    Quest Components SN74ALS520DWR 73
    • 1 $4.29
    • 10 $3.146
    • 100 $2.86
    • 1000 $2.86
    • 10000 $2.86
    Buy Now
    ComSIT USA SN74ALS520DWR 2,050
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote
    Chip 1 Exchange SN74ALS520DWR 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Get Quote

    Texas Instruments SN74ALS520DWRE4

    IC COMPARATOR IDENTITY 8B 20SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74ALS520DWRE4 Reel 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.93392
    Buy Now

    Texas Instruments SN74ALS520DWRG4

    IC COMPARATOR IDENTITY 8B 20SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74ALS520DWRG4 Reel 2,000
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.93392
    Buy Now

    SN74ALS520DW Datasheets (18)

    Part ECAD Model Manufacturer Description Curated Datasheet Type PDF
    SN74ALS520DW Texas Instruments 8-Bit Identity Comparators (P=Q) with Enable and 20K Ohm Q-Input Pullup Resistors 20-SOIC 0 to 70 Original PDF
    SN74ALS520DW Texas Instruments 8 Bit Identity Comparator Original PDF
    SN74ALS520DW Texas Instruments SN74ALS520 - 8-Bit Identity Comparators (P=Q) with Enable and 20K Ohm Q-Input Pullup Resistors 20-SOIC 0 to 70 Original PDF
    SN74ALS520DW Unknown Historical semiconductor price guide (US$ - 1998). From our catalog scanning project. Historical PDF
    SN74ALS520DWE4 Texas Instruments 8-Bit Identity Comparators (P=Q) with Enable and 20K Ohm Q-Input Pullup Resistors 20-SOIC 0 to 70 Original PDF
    SN74ALS520DWE4 Texas Instruments 8-Bit IDENTITY COMPARATOR Original PDF
    SN74ALS520DWE4 Texas Instruments SN74ALS520 - 8-Bit Identity Comparators (P=Q) with Enable and 20K Ohm Q-Input Pullup Resistors 20-SOIC 0 to 70 Original PDF
    SN74ALS520DWG4 Texas Instruments 8-Bit Identity Comparators (P=Q) with Enable and 20K Ohm Q-Input Pullup Resistors 20-SOIC 0 to 70 Original PDF
    SN74ALS520DWG4 Texas Instruments SN74ALS520 - 8-Bit Identity Comparators (P=Q) with Enable and 20K Ohm Q-Input Pullup Resistors 20-SOIC 0 to 70 Original PDF
    SN74ALS520DWR Texas Instruments 8-Bit Comparator, inverting Output Original PDF
    SN74ALS520DWR Texas Instruments 8-Bit Identity Comparators (P=Q) with Enable and 20K Ohm Q-Input Pullup Resistors 20-SOIC 0 to 70 Original PDF
    SN74ALS520DWR Texas Instruments 8-BIT IDENTITY COMPARATORS Original PDF
    SN74ALS520DWR Texas Instruments SN74ALS520 - IC ALS SERIES, 8-BIT IDENTITY COMPARATOR, INVERTED OUTPUT, PDSO20, GREEN, PLASTIC, SOIC-20, Arithmetic Circuit Original PDF
    SN74ALS520DWRE4 Texas Instruments 8-Bit Identity Comparators (P=Q) with Enable and 20K Ohm Q-Input Pullup Resistors 20-SOIC 0 to 70 Original PDF
    SN74ALS520DWRE4 Texas Instruments 8-Bit IDENTITY COMPARATOR Original PDF
    SN74ALS520DWRE4 Texas Instruments SN74ALS520 - IC ALS SERIES, 8-BIT IDENTITY COMPARATOR, INVERTED OUTPUT, PDSO20, GREEN, PLASTIC, SOIC-20, Arithmetic Circuit Original PDF
    SN74ALS520DWRG4 Texas Instruments 8-Bit Identity Comparators (P=Q) with Enable and 20K Ohm Q-Input Pullup Resistors 20-SOIC 0 to 70 Original PDF
    SN74ALS520DWRG4 Texas Instruments SN74ALS520 - IC ALS SERIES, 8-BIT IDENTITY COMPARATOR, INVERTED OUTPUT, PDSO20, GREEN, PLASTIC, SOIC-20, Arithmetic Circuit Original PDF

    SN74ALS520DW Datasheets Context Search

    Catalog Datasheet MFG & Type Document Tags PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 300-mil SN54ALS520 PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 300-mil SN54ALS520 PDF

    5962-88691012A

    Abstract: SN54ALS520 SN74ALS518 SN74ALS520 SN74ALS521
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 SN74ALS521 ALS688. 5962-88691012A SN54ALS520 SN74ALS518 SN74ALS520 PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 300-mil SN54ALS520 PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 300-mil SN54ALS520 PDF

    5962-88691012A

    Abstract: SN54ALS520 SN74ALS518 SN74ALS520 SN74ALS521
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 SN74ALS521 ALS688. 5962-88691012A SN54ALS520 SN74ALS518 SN74ALS520 PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 300-mil SN54ALS520 PDF

    5962-88691012A

    Abstract: SN54ALS520 SN74ALS518 SN74ALS520 SN74ALS521 automotive video switch
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 SN74ALS521 ALS688. 5962-88691012A SN54ALS520 SN74ALS518 SN74ALS520 automotive video switch PDF

    5962-88691012A

    Abstract: SN54ALS520 SN74ALS518 SN74ALS520 SN74ALS521
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 SN74ALS521 ALS688. 5962-88691012A SN54ALS520 SN74ALS518 SN74ALS520 PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 300-mil SN54ALS520 PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 300-mil SN54ALS520 PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 300-mil SN54ALS520 PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 300-mil SN54ALS520 PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 300-mil SN54ALS520 PDF

    8-BIT IDENTITY COMPARATORS

    Abstract: SN54ALS520 SN74ALS518 SN74ALS520 SN74ALS521 5962-88691012A
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 SN74ALS521 ALS688. 8-BIT IDENTITY COMPARATORS SN54ALS520 SN74ALS518 SN74ALS520 5962-88691012A PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 300-mil SN54ALS520 PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 SN74ALS521 ALS688. PDF

    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

    Untitled

    Abstract: No abstract text available
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 300-mil SN54ALS520 PDF

    c5088 transistor

    Abstract: transistor C3207 TLO84CN sec c5088 IN5355B D2817A C3207 transistor toshiba f630 TLO81CP MC74HC533N
    Text: Transistor - Diode Cross Reference - H.P. Part Numbers to JEDEC Numbers Part Num. 1820-0225 1820-0240 1820-0352 1820-1804 1821-0001 1821-0002 1821-0006 1850-0062 1850-0064 1850-0075 1850-0076 1850-0093 1850-0099 1850-0126 1850-0137 1850-0150 1850-0151 1850-0154


    Original
    1853IMPATT c5088 transistor transistor C3207 TLO84CN sec c5088 IN5355B D2817A C3207 transistor toshiba f630 TLO81CP MC74HC533N PDF

    Untitled

    Abstract: No abstract text available
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 SN74ALS521 ALS688. PDF

    ALS520

    Abstract: No abstract text available
    Text: SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 8-BIT IDENTITY COMPARATORS SDAS224B – JUNE 1982 – REVISED NOVEMBER 1995 • TYPE SN74ALS518 INPUT PULLUP RESISTOR Yes G P0 Q0 P1 Q1 P2 Q2 P3 Q3 GND OUTPUT FUNCTION AND CONFIGURATION P = Q open collector ′ALS520


    Original
    SN54ALS520, SN74ALS518, SN74ALS520, SN74ALS521 SDAS224B SN74ALS518 ALS520 300-mil SN54ALS520 PDF

    SN74LS00N

    Abstract: SN74LS14N SN74HC74D SN74HC125D SN74LS04N SN74HC138D SN74LS163AN SN74LS138N SN74LS126AN sn74ls148n
    Text: Semiconductor Directory Mfr.Õs Type 13 Price Mfr.Õs Code Page Mfr.Õs Type Price Mfr.Õs Code Page Mfr.Õs Type Price Mfr.Õs Code Page Mfr.Õs Type Price Mfr.Õs Code Page SN74ALS109AN SN74ALS10AN SN74ALS112AN SN74ALS11AN SN74ALS139N 0.64 0.37 0.76 0.53


    Original
    SN74ALS109AN SN74AS804BN SN74HC165N SN74LS07N SN74ALS10AN SN74AS805BN SN74HC166N SN74LS08D SN74ALS112AN SN74AS808BN SN74LS00N SN74LS14N SN74HC74D SN74HC125D SN74LS04N SN74HC138D SN74LS163AN SN74LS138N SN74LS126AN sn74ls148n PDF