Expansion to 32 key encoder mm74c922 theory of operationthe mm74c922 mm74c923 keyboard encoders implement all the logic necessary to interface a 16 or 20 spstkey switch matrix to a digital system. Absolute maximum ratings are those values beyond which thesafety of the device cannot be guaranteed. Mm74c221 dual monostable multivibrator mm74c221 dual monostable multivibrator general description the mm74c221 dual monostable multivibrator is a monolithic complementary mos integrated circuit. October 1987 revised january 1999 mm74c922 mm74c923 16key encoder 20key encoder general description the mm74c922 and mm74c923 cmos key encoders provide all the necessary logic to fully encode an array of spst swi. Select the part name and then you can download the datasheet in. Fairchild, alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. The mm74c922 and mm74c923 cmos key encoders provide all. Dc electrical characteristics continuedac electrical characteristics note 3ta 25c, cl 50 pf, unless otherwise notednote 3. Pcf8574 remote 8bit io expander for i2c bus datasheet rev. The table of electrical characteristics providesconditions for actual device operation. The encoder will convert a key switch closer to a 4 mm74c922 or 5mm74c923 bit nibble. October 1987revised january 1999 1999 fairchild semiconductor corporationds006037.
The encoder chip continuously scans the keypad waiting for a key press. Mm74c925, mm74c926, mm74c927, mm74c928, datasheet, datasheets, pdf, national semiconductor, texas instruments, datasheetcatalog. The table of electrical characteristics providesconditions for actual device. Mm74c925 mm74c926 mm74c 927 mm74c928 4digit counters. Mm74c922 datasheet, mm74c922 pdf, mm74c922 data sheet, mm74c922 manual, mm74c922 pdf, mm74c922, datenblatt, electronics mm74c922, alldatasheet, free, datasheet. Mm74hc datasheet, mm74hc pdf, mm74hc data sheet, datasheet, data sheet, pdf. Mm74c922n datasheet texas instruments, download pdf. Mm74c922 mm74c923 16key encoder 20key encoder general description the mm74c922 and mm74c923 cmos key encoders provide all the necessary logic to fully encode an array of spst switches. These cmos key encoders provide all the necessary logic. Each multivibrator features a negativetransitiontriggered input and a positivetransitiontriggered input, either of which can be used as an inhibit input, and a clear input. Nsc 16, 20key encoder,alldatasheet, datasheet, datasheet search site for electronic.
Compare pricing for on semiconductor mm74c922wm across 6 distributors and discover alternative parts, cad models, technical specifications, datasheets, and more on octopart. Fairchild 16key encoder 20key encoder,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Select the part name and then you can download the datasheet in pdf. Mm74c922 mm74c922 mm74c923 16key encoder 20key encoder. This is one package pinout of mm74c922,if you need more pinouts please download mm74c922s pdf datasheet. The 74c922 datasheet shows the truth table on pg4 and the layout and wiring on pgs. The datasheetarchive datasheet search engine author. Mm54c922mm74c922 16key encoder mm54c923mm74c923 20key encoder. Mm74c922 mm74c92316key encoder 20key encodergeneral descriptionthe mm74c922 and mm74c923 cmos key encoders provide all the necessary logic to fully encode an array of datasheet search, datasheets, datasheet search site for electronic components and semiconductors, integrated. Mm74c42 bcdtodecimal decoder mm74c42 bcdtodecimal decoder general description the mm74c42 oneoften decoder is a monolithic complementary mos cmos integrated circuit constructed with n and pchannel enhancement transistors. Mm74c922wm on semiconductor datasheet and cad model download. An important notice at the end of this data sheet addresses availability, warranty, changes, use in safetycritical applications, intellectual property matters. Mm54c922mm74c922 16key encoder mm54c923mm74c923 20key encoder generaldescription these cmos key encoders provide all the necessary logic to fully encode an array of spst switches the keyboard scan can be implemented by either an external clock or external capacitor these encoders also have onchip pull.
Mm74c922 datasheetpdf 8 page fairchild semiconductor. Output drive see family characteristics data sheet short circuit current. Mm74c922n datasheetpdf 5 page fairchild semiconductor. Processor peripheral devices reset, enable, or control inputs int or status outputs leds sda scl int a0 a1 a2 gnd vcc p0 p1 p2. When a switch is pressed, it provides a 4bit nibble corresponding to the pressed switch at its output pins d, b, c, and a 1417. The mm74c922 encoder implements all the logic necessary to interface a 16key switch matrix to a digital system. Mm74c925 mm74c926 4digit counters with multiplexed 7segment output drivers mm74c925 mm74c926 4digit counters with multiplexed 7segment output drivers general description the mm74c925 and mm74c926 cmos counters consist of a 4digit counter, an internal output latch, npn output sourcing drivers for a 7segment display, and an internal.
Mm74c922 datasheet, pinout,application circuits 16, 20key encoder. Mm74c922 mm74c92316key encoder 20key encodergeneral descriptionthe mm74c922 and mm74c923 cmos key encoders provide all the necessary logic to fully encode an array of datasheet search, datasheets, datasheet search. The mm74c922 and mm74c923 cmos key encoders pro vide all the. These encoders also have onchip pullup devices which permit switches with up to 50 k. Expansion to 32 key encoder mm74c922 theory of operation the mm74c922 mm74c923 keyboard encoders implement all the logic necessary to interface a 16 or 20 spst key switch matrix to a digital system. The mm74c922 mm74c923 keyboard encoders implement all the logic necessary to interface a 16 or 20 spst key switch matrix to a digital system the encoder will convert a key switch closer to a 4mm74c922 or 5mm74c923 bit nibble the designer can control both the keyboard scan rate and the key debounce period by altering. Lm35 precision centigrade temperature sensors datasheet rev. Mm74c925 mm74c926 mm74c927 mm74c928 4digit counters with. Offer mm74c922 from kynix semiconductor hong kong limited. Mm54c922,mm54c923,mm74c922,mm74c923 mm54c922 mm74c922 16 key encoder mm54c923 mm74c923 20key encoder literature number. Ic encoder 20key 20dip online from elcodis, view and download mm74c923n pdf datasheet, logic signal switches, multiplexers, decoders specifications.
Mm74c922 pdf, mm74c922 description, mm74c922 datasheets. Pob 123 new hill nc 27562 919 2907104part number 74c922sodecember 2012 page 1 of 574c922so ickeyboard keypad encoder for up to 16 switchesmm74c922 replacement icgeneral descriptionthe 74c922so is designed as a replacement chip for the obsolete mm74c922 surface mountpart. Ac parameters are guaranteed by dc correlated testing. Relays, solenoids, lamps, hammers, displays, memories, transistors, etc. The mm74c922 cmos key encoders provide all the necessary logic to fully encode an array of spst switches. Mm74c922wm on semiconductor datasheet and cad model. Mm74c922 datasheet, mm74c922 datasheets, mm74c922 pdf, mm74c922 circuit. Mm74c922 mm74c923 asynchronous data entry onto bus mm74c922 outputs are in 3state until key is pressed, then data is placed on bus. Expansion to 32 key encoder mm74c922theory of operationthe mm74c922mm74c923 keyboard encoders implement all the logic necessary to interface a. This is a 16key matrix keypad project using the 74c922 16key encoder ic circa 1995.
Fairchildon semiconductor mm74c922wm is available at win source. Functional diagram mna858 rd ff sd 5 11 q 1q 2q 1q 2q 6 10 2 14 4 12 7 9 q 1sd cp 2cp 1cp 2j 1j. Tlf6037july 1993mm54c922mm74c922 16key encodermm54c923mm74c923 20key encodergeneral descriptionthese cmos key encoders provide all the necessary logicto fully encode an array of spst switches the keyboardscan can be implemented by either an external clock orexternal capacitor these encoders also have onchip pullup devices which permit switches with up to 50 kx on resist datasheet search. Download datasheets and manufacturer documentation for on semiconductor mm74c922wm. Compare pricing for national semiconductor mm74c935n1 across 3 distributors and discover alternative parts, cad models, technical specifications, datasheets, and more on octopart. Mm74c923n fairchild semiconductor, mm74c923n datasheet. Dc electrical characteristicsminmax limits apply across temperature range unless otherwise specified datasheet search, datasheets, datasheet search site for electronic components and semiconductors, integrated circuits, diodes and other semiconductors. The mm74c221 dual monostable multivibrator is a monolithic complementary mos integrated circuit. Output drive see 54c 74c family characteristics data sheet short circuit current. Mm74c925 mm74c926 mm74c927 mm74c928 4digit counters with multiplexed 7segment output drivers generaldescription these cmos counters consist of a 4digit counter an internal output latch npn output sourcing drivers for a 7segment display and an internal multiplexing circuitry with four multiplexing outputs the multiplexing circuit has its own. Hex inverter,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. Mm74c922 datasheetpdf 2 page fairchild semiconductor.
Expansion to 32 key encoder mm74c922 theory of operation the mm74c922mm74c923 keyboard encoders implement all the logic necessary to interface a. Nsc, alldatasheet, datasheet, datasheet search site for electronic components and. Each multivibrator features a negativetransitiontriggered input and a positivetransitiontriggered input, either of which can be. Except for operating temperature range they are not meant to imply that the devices should be operated at these limits. Ic encoder 20key 20dip online from elcodis, view and download mm74c923n pdf datasheet, logic. This decoder produces a logical 0 at the output corresponding to a four. Mm74c925 mm74c926 4digit counters with multiplexed 7.
Mm74c925 mm74c926 mm74c927 mm74c928 4digit counters with multiplexed 7segment output drivers. Family characteristics data sheet short circuit current isource. Click here to download 74c922 datasheet click here to download datasheet. Pcf8574 remote 8bit io expander for i2c bus datasheet. Symbolparameterconditions datasheet search, datasheets, datasheet search site for electronic components and semiconductors. Mm74c922 logic signal switches, multiplexers, decoders.
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