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    SN74LS390 Search Results

    SN74LS390 Result Highlights (4)

    Part ECAD Model Manufacturer Description Download Buy
    SN74LS390D Texas Instruments Dual 4-Bit Decade Counters 16-SOIC 0 to 70 Visit Texas Instruments Buy
    SN74LS390NSR Texas Instruments Dual 4-Bit Decade Counters 16-SO 0 to 70 Visit Texas Instruments
    SN74LS390N Texas Instruments Dual 4-Bit Decade Counters 16-PDIP 0 to 70 Visit Texas Instruments Buy
    SN74LS390NE4 Texas Instruments Dual 4-Bit Decade Counters 16-PDIP 0 to 70 Visit Texas Instruments Buy
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    SN74LS390 Price and Stock

    Texas Instruments SN74LS390N

    IC DECADE COUNTER DL 4BIT 16DIP
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74LS390N Tube 869 1
    • 1 $2.1
    • 10 $1.551
    • 100 $1.2634
    • 1000 $1.11253
    • 10000 $1.05217
    Buy Now
    Mouser Electronics SN74LS390N 585
    • 1 $2.1
    • 10 $1.42
    • 100 $1.26
    • 1000 $1.11
    • 10000 $1.05
    Buy Now
    Verical SN74LS390N 975 295
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.1475
    • 10000 $1.1475
    Buy Now
    SN74LS390N 625 295
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.1475
    • 10000 $1.1475
    Buy Now
    SN74LS390N 461 6
    • 1 -
    • 10 $1.4048
    • 100 $1.2307
    • 1000 $1.1064
    • 10000 $1.0474
    Buy Now
    SN74LS390N 305 295
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.1475
    • 10000 $1.1475
    Buy Now
    Arrow Electronics SN74LS390N 461 12 Weeks 1
    • 1 $2.0689
    • 10 $1.4048
    • 100 $1.2307
    • 1000 $1.1064
    • 10000 $1.0474
    Buy Now
    SN74LS390N 50 12 Weeks 25
    • 1 -
    • 10 -
    • 100 $1.0603
    • 1000 $0.9868
    • 10000 $0.9529
    Buy Now
    Newark SN74LS390N Bulk 784 1
    • 1 $2.84
    • 10 $2.63
    • 100 $2.2
    • 1000 $2.06
    • 10000 $2.06
    Buy Now
    Bristol Electronics SN74LS390N 420
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
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    SN74LS390N 277
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
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    SN74LS390N 13
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
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    Quest Components SN74LS390N 175
    • 1 $1.7
    • 10 $1.7
    • 100 $0.85
    • 1000 $0.85
    • 10000 $0.85
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    SN74LS390N 29
    • 1 $3
    • 10 $2.25
    • 100 $1.875
    • 1000 $1.875
    • 10000 $1.875
    Buy Now
    SN74LS390N 28
    • 1 $2.123
    • 10 $1.6984
    • 100 $1.2738
    • 1000 $1.2738
    • 10000 $1.2738
    Buy Now
    Rochester Electronics SN74LS390N 2,238 1
    • 1 $1.08
    • 10 $1.08
    • 100 $1.02
    • 1000 $0.918
    • 10000 $0.918
    Buy Now
    TME SN74LS390N 254 1
    • 1 $2.05
    • 10 $1.82
    • 100 $1.49
    • 1000 $1.32
    • 10000 $1.32
    Buy Now
    Chip1Stop SN74LS390N Tube 38
    • 1 $1.13
    • 10 $0.943
    • 100 $0.943
    • 1000 $0.943
    • 10000 $0.943
    Buy Now

    Texas Instruments SN74LS390D

    IC DECADE COUNTR DL 4BIT 16SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74LS390D Tube 146 1
    • 1 $1.66
    • 10 $1.219
    • 100 $1.66
    • 1000 $0.86284
    • 10000 $0.81388
    Buy Now
    Mouser Electronics SN74LS390D 422
    • 1 $1.54
    • 10 $1.07
    • 100 $1.07
    • 1000 $0.811
    • 10000 $0.774
    Buy Now
    Quest Components SN74LS390D 2,177
    • 1 $2.3012
    • 10 $2.3012
    • 100 $2.3012
    • 1000 $0.9492
    • 10000 $0.863
    Buy Now
    SN74LS390D 714
    • 1 $1.4383
    • 10 $1.4383
    • 100 $1.4383
    • 1000 $0.7191
    • 10000 $0.7191
    Buy Now
    SN74LS390D 270
    • 1 $2.065
    • 10 $2.065
    • 100 $0.6195
    • 1000 $0.6195
    • 10000 $0.6195
    Buy Now
    SN74LS390D 172
    • 1 $2.065
    • 10 $2.065
    • 100 $0.6195
    • 1000 $0.6195
    • 10000 $0.6195
    Buy Now

    Rochester Electronics LLC SN74LS390N

    SN74LS390 DUAL 4-BIT DECADE COUN
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74LS390N Bulk 268
    • 1 -
    • 10 -
    • 100 -
    • 1000 $1.12
    • 10000 $1.12
    Buy Now

    Texas Instruments SN74LS390DR

    IC DECADE COUNTR DL 4BIT 16SOIC
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74LS390DR Reel 2,500
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 $0.59091
    Buy Now

    Texas Instruments SN74LS390NS

    IC DECADE COUNTER DL 4BIT 16SO
    Distributors Part Package Stock Lead Time Min Order Qty Price Buy
    DigiKey SN74LS390NS Tube
    • 1 -
    • 10 -
    • 100 -
    • 1000 -
    • 10000 -
    Buy Now
    Verical SN74LS390NS 1,150 360
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.9439
    • 10000 $0.9439
    Buy Now
    SN74LS390NS 700 360
    • 1 -
    • 10 -
    • 100 -
    • 1000 $0.9439
    • 10000 $0.9439
    Buy Now
    Rochester Electronics SN74LS390NS 1,850 1
    • 1 $0.8883
    • 10 $0.8883
    • 100 $0.835
    • 1000 $0.7551
    • 10000 $0.7551
    Buy Now

    SN74LS390 Datasheets (72)

    Part ECAD Model Manufacturer Description Curated Datasheet Type PDF
    SN74LS390 Motorola DUAL DECADE COUNTER DUAL 4-STAGE BINARY COUNTER Original PDF
    SN74LS390 On Semiconductor DUAL DECADE COUNTER DUAL 4-STAGE BINARY COUNTER Original PDF
    SN74LS390 Texas Instruments DUAL 4-BIT DECADE AND BINARY COUNTERS Original PDF
    SN74LS390D Motorola DUAL DECADE COUNTER DUAL 4-STAGE BINARY COUNTER Original PDF
    SN74LS390D On Semiconductor DUAL DECADE COUNTER DUAL 4-STAGE BINARY COUNTER Original PDF
    SN74LS390D Texas Instruments Logic - Counters, Dividers, Integrated Circuits (ICs), IC BIN COUNTR DUAL 4BIT 16-SOIC Original PDF
    SN74LS390D Texas Instruments Dual 4-Bit Decade Counters 16-SOIC 0 to 70 Original PDF
    SN74LS390D Texas Instruments DUAL 4-BIT DECADE AND BINARY COUNTERS Original PDF
    SN74LS390D Texas Instruments SN74LS390 - Dual 4-Bit Decade Counters 16-SOIC 0 to 70 Original PDF
    SN74LS390D Motorola Dual Decade Counter Scan PDF
    SN74LS390D Unknown Historical semiconductor price guide (US$ - 1998). From our catalog scanning project. Historical PDF
    SN74LS390D Unknown Historical semiconductor price guide (US$ - 1998). From our catalog scanning project. Historical PDF
    SN74LS390DE4 Texas Instruments Logic - Counters, Dividers, Integrated Circuits (ICs), IC BIN COUNTR DUAL 4BIT 16-SOIC Original PDF
    SN74LS390DE4 Texas Instruments DUAL 4-Bit DECADE and BINARY COUNTER Original PDF
    SN74LS390DE4 Texas Instruments Dual 4-Bit Decade Counters 16-SOIC 0 to 70 Original PDF
    SN74LS390DE4 Texas Instruments SN74LS390 - Dual 4-Bit Decade Counters 16-SOIC 0 to 70 Original PDF
    SN74LS390DG4 Texas Instruments Logic - Counters, Dividers, Integrated Circuits (ICs), IC COUNTER DECADE 8BIT 16SOIC Original PDF
    SN74LS390DG4 Texas Instruments Dual 4-Bit Decade Counters 16-SOIC 0 to 70 Original PDF
    SN74LS390DG4 Texas Instruments SN74LS390 - Dual 4-Bit Decade Counters 16-SOIC 0 to 70 Original PDF
    SN74LS390DR Texas Instruments Logic - Counters, Dividers, Integrated Circuits (ICs), IC BIN COUNTR DUAL 4BIT 16-SOIC Original PDF

    SN74LS390 Datasheets Context Search

    Catalog Datasheet MFG & Type PDF Document Tags

    Untitled

    Abstract: No abstract text available
    Text: SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS SDLS107 – OCTOBER 1976 – REVISED MARCH 1988 Copyright  1988, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.


    Original
    PDF SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 SDLS107

    Untitled

    Abstract: No abstract text available
    Text: SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS SDLS107 – OCTOBER 1976 – REVISED MARCH 1988 Copyright  1988, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.


    Original
    PDF SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 SDLS107

    M38510

    Abstract: No abstract text available
    Text: SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS SDLS107 – OCTOBER 1976 – REVISED MARCH 1988 Copyright  1988, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.


    Original
    PDF SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 SDLS107 M38510

    SN74LS390

    Abstract: M38510
    Text: SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS SDLS107 – OCTOBER 1976 – REVISED MARCH 1988 Copyright  1988, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.


    Original
    PDF SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 SDLS107 SN74LS390 M38510

    Untitled

    Abstract: No abstract text available
    Text: SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS SDLS107 – OCTOBER 1976 – REVISED MARCH 1988 Copyright  1988, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.


    Original
    PDF SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 SDLS107

    7802601EA

    Abstract: SN54390 SN54393 SN54LS390 SN54LS393 SN74390 SN74393 SN74LS390 SN74LS393
    Text: SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS SDLS107 – OCTOBER 1976 – REVISED MARCH 1988 Copyright  1988, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.


    Original
    PDF SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 SDLS107 7802601EA SN54390 SN54393 SN54LS390 SN54LS393 SN74390 SN74393 SN74LS390 SN74LS393

    Untitled

    Abstract: No abstract text available
    Text: SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS SDLS107 – OCTOBER 1976 – REVISED MARCH 1988 Copyright  1988, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.


    Original
    PDF SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 SDLS107

    SN74LS390

    Abstract: SN54390 SN54393 SN54LS390 SN54LS393 SN74390 SN74393 SN74LS393
    Text: SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS SDLS107 – OCTOBER 1976 – REVISED MARCH 1988 Copyright  1988, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.


    Original
    PDF SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 SDLS107 SN74LS390 SN54390 SN54393 SN54LS390 SN54LS393 SN74390 SN74393 SN74LS393

    JM38510/01405BEA

    Abstract: 74ls390 M38510
    Text: SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS SDLS107 – OCTOBER 1976 – REVISED MARCH 1988 Copyright  1988, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.


    Original
    PDF SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 SDLS107 JM38510/01405BEA 74ls390 M38510

    M38510

    Abstract: No abstract text available
    Text: SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS SDLS107 – OCTOBER 1976 – REVISED MARCH 1988 Copyright  1988, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.


    Original
    PDF SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 SDLS107 M38510

    Untitled

    Abstract: No abstract text available
    Text: SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS SDLS107 – OCTOBER 1976 – REVISED MARCH 1988 Copyright  1988, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.


    Original
    PDF SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 SDLS107

    JM38510/01405BEA

    Abstract: 74ls390 M38510
    Text: SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS SDLS107 – OCTOBER 1976 – REVISED MARCH 1988 Copyright  1988, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.


    Original
    PDF SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 SDLS107 JM38510/01405BEA 74ls390 M38510

    SN7439

    Abstract: No abstract text available
    Text: SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS SDLS107 – OCTOBER 1976 – REVISED MARCH 1988 Copyright  1988, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.


    Original
    PDF SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 SDLS107 SN7439

    Untitled

    Abstract: No abstract text available
    Text: SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS SDLS107 – OCTOBER 1976 – REVISED MARCH 1988 Copyright  1988, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.


    Original
    PDF SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 SDLS107

    Untitled

    Abstract: No abstract text available
    Text: SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS SDLS107 – OCTOBER 1976 – REVISED MARCH 1988 Copyright  1988, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.


    Original
    PDF SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 SDLS107

    SN74LS393N

    Abstract: SN-74LS393N SN74393N sn74ls390n 7802601EA SN54390 SN54393 SN54LS390 SN54LS393 SN74390
    Text: SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS SDLS107 – OCTOBER 1976 – REVISED MARCH 1988 Copyright  1988, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.


    Original
    PDF SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 SDLS107 SN74LS393N SN-74LS393N SN74393N sn74ls390n 7802601EA SN54390 SN54393 SN54LS390 SN54LS393 SN74390

    Untitled

    Abstract: No abstract text available
    Text: SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS SDLS107 – OCTOBER 1976 – REVISED MARCH 1988 Copyright  1988, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.


    Original
    PDF SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 SDLS107

    Untitled

    Abstract: No abstract text available
    Text: SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS SDLS107 – OCTOBER 1976 – REVISED MARCH 1988 Copyright  1988, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.


    Original
    PDF SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 SDLS107

    Untitled

    Abstract: No abstract text available
    Text: SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS SDLS107 – OCTOBER 1976 – REVISED MARCH 1988 Copyright  1988, Texas Instruments Incorporated PRODUCTION DATA information is current as of publication date.


    Original
    PDF SN54390, SN54LS390, SN54393, SN54LS393 SN74390, SN74LS390, SN74393, SN74LS393 SDLS107

    ic 74393

    Abstract: ic 74390
    Text: TYPES SN54390, SN54LS390, SN54393, SN54LS393, SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS O C T O B E R 1 9 7 6 — R E V IS E D D E C E M B E R 1 9 8 3 Dual Versions o f the Popular '90A, 'LS90 and '93A, 'LS93 S N 54390, SN 54LS390


    OCR Scan
    PDF SN54390, SN54LS390, SN54393, SN54LS393, SN74390, SN74LS390, SN74393, SN74LS393 LS390 LS393 ic 74393 ic 74390

    Untitled

    Abstract: No abstract text available
    Text: ? TYPES SN74LS390, SN74393, SN74LS393 SN54LS390, SN54393, SN54LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS OCTOBER 1976 • REVISED DECEMBER 1983 D ual Versions o f th e Popular '9 0 A , 'L S 9 0 a n d 'L S 9 3 '3 9 0 , 'L S 3 9 0 . . . Individual Clocks fo r A and B


    OCR Scan
    PDF SN74LS390, SN74393, SN74LS393 SN54LS390, SN54393, SN54LS393 SN54LS390. SN74LS390 LS390 LS393

    ic 74390

    Abstract: 74390 Decade Counter 54LS390
    Text: SN54390, SN54LS390, SN54393, SN54LS393, SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4-BIT DECADE AND BINARY COUNTERS OCTOBER 1 9 7 6 - '390, 'LS390 . . . Individual Clocks for A and B Flip-Flops Provide Dual ^ 2 and + 5 Counters TOP VIEW £ 1CKA U , 6 D v Cc


    OCR Scan
    PDF SN54390, SN54LS390, SN54393, SN54LS393, SN74390, SN74LS390, SN74393, SN74LS393 LS390 LS393 ic 74390 74390 Decade Counter 54LS390

    Untitled

    Abstract: No abstract text available
    Text: SN54390, SN54LS390, SN54393, SN54LS393, SN74390, SN74LS390, SN74393, SN74LS393 DUAL 4 BIT DECADE AND BINARY COUNTERS OCTOBER 1976 - S N 7 4 3 9 0 . . . N P AC K A G E SN 74LS390 . D OR N P AC KA G E '390, 'LS390 . . . Individual Clocks for A and B Flip-Flops Provide Dual + 2 and 5 Counters


    OCR Scan
    PDF SN54390, SN54LS390, SN54393, SN54LS393, SN74390, SN74LS390, SN74393, SN74LS393 74LS390 LS390

    IC 74390

    Abstract: ic 74393 74390 Decade Counter 74390 binary counter ic 7490 Decade Counter of 7490 IC decade counter SN74383 74LS380 ic ttl 7490 SN74LS383
    Text: _ TTL TYPES SNS4390, SNS4LS39D, SN54393. SN54LS393, SN74390, SN74LS390. SN74393, SN74LS393 DUAL 4-BIT DECADE AND BlNAltY COUNTERS SN S4390, SN 54LS390 . . . J O R W P A C K A G E • Dual Versions of the Popular '90A, 'LS90 and '93A, 'LS93 • '390, 'LS390. . .Individual Clocks for A and B


    OCR Scan
    PDF SNS4390, SNS4LS39D, SN54393. SN54LS393, SN74390, SN74LS390. SN74393, SN74LS393 S4390, 54LS390 IC 74390 ic 74393 74390 Decade Counter 74390 binary counter ic 7490 Decade Counter of 7490 IC decade counter SN74383 74LS380 ic ttl 7490 SN74LS383