What would we do without them?
+---+--+---+ +---+---+----+----*---+---+ 1J |1 +--+ 14| VCC | J | K |/CLK|/RST| Q |/Q | /1Q |2 13| /1RST +===+===+====+====*===+===+ 1Q |3 74 12| /1CLK | X | X | X | 0 | 0 | 1 | 1K |4 107 11| 2K | 0 | 0 | \ | 1 | - | - | 2Q |5 10| /2RST | 0 | 1 | \ | 1 | 0 | 1 | /2Q |6 9| /2CLK | 1 | 0 | \ | 1 | 1 | 0 | GND |7 8| 2J | 1 | 1 | \ | 1 |/Q | Q | +----------+ | X | X | !\ | 1 | - | - | +---+---+----+----*---+---+
+---+--+---+ +---+---+---+----+----*---+---+ /1RST |1 +--+ 16| VCC | J |/K |CLK|/SET|/RST| Q |/Q | 1J |2 15| /2RST +===+===+===+====+====*===+===+ /1K |3 14| 2J | X | X | X | 0 | 0 | 1 | 1 | 1CLK |4 74 13| /2K | X | X | X | 0 | 1 | 1 | 0 | /1SET |5 109 12| 2CLK | X | X | X | 1 | 0 | 0 | 1 | 1Q |6 11| /2SET | 0 | 0 | / | 1 | 1 | 0 | 1 | /1Q |7 10| 2Q | 0 | 1 | / | 1 | 1 | - | - | GND |8 9| /2Q | 1 | 0 | / | 1 | 1 |/Q | Q | +----------+ | 1 | 1 | / | 1 | 1 | 1 | 0 | | X | X |!/ | 1 | 1 | - | - | +---+---+---+----+----*---+---+
+---+--+---+ +---+---+----+----+----*---+---+ /1CLK |1 +--+ 16| VCC | J | K |/CLK|/SET|/RST| Q |/Q | 1K |2 15| /1RST +===+===+====+====+====*===+===+ 1J |3 14| /2RST | X | X | X | 0 | 0 | 0 | 0 | /1SET |4 74 13| /2CLK | X | X | X | 0 | 1 | 1 | 0 | 1Q |5 112 12| 2K | X | X | X | 1 | 0 | 0 | 1 | /1Q |6 11| 2J | 0 | 0 | \ | 1 | 1 | - | - | /2Q |7 10| /2SET | 0 | 1 | \ | 1 | 1 | 0 | 1 | GND |8 9| 2Q | 1 | 0 | \ | 1 | 1 | 1 | 0 | +----------+ | 1 | 1 | \ | 1 | 1 |/Q | Q | | X | X | !\ | 1 | 1 | - | - | +---+---+----+----+----*---+---+
+---+--+---+ +---+---+----+----*---+---+ /1CLK |1 +--+ 14| VCC | J | K |/CLK|/SET| Q |/Q | 1K |2 13| /2CLK +===+===+====+====*===+===+ 1J |3 74 12| 2K | X | X | X | 0 | 1 | 0 | /1SET |4 113 11| 2J | X | X | X | 1 | 0 | 1 | 1Q |5 10| /2SET | 0 | 0 | \ | 1 | - | - | /1Q |6 9| 2Q | 0 | 1 | \ | 1 | 0 | 1 | GND |7 8| /2Q | 1 | 0 | \ | 1 | 1 | 0 | +----------+ | 1 | 1 | \ | 1 |/Q | Q | | X | X | !\ | 1 | - | - | +---+---+----+----*---+---+
+---+--+---+ +---+---+----+----+----*---+---+ /RST |1 +--+ 14| VCC | J | K |/CLK|/SET|/RST| Q |/Q | 1K |2 13| /CLK +===+===+====+====+====*===+===+ 1J |3 74 12| 2K | X | X | X | 0 | 0 | ? | ? | /1SET |4 114 11| 2J | X | X | X | 0 | 1 | 1 | 0 | 1Q |5 10| /2SET | X | X | X | 1 | 0 | 0 | 1 | /1Q |6 9| 2Q | 0 | 0 | \ | 1 | 1 | - | - | GND |7 8| /2Q | 0 | 1 | \ | 1 | 1 | 0 | 1 | +----------+ | 1 | 0 | \ | 1 | 1 | 1 | 0 | | 1 | 1 | \ | 1 | 1 |/Q | Q | | X | X | !\ | 1 | 1 | - | - | +---+---+----+----+----*---+---+
+---+--+---+ /Q |1 +--+ 14| VCC |2 13| /TR1 |3 74 12| /TR2 |4 121 11| RCext TR |5 10| Cext Q |6 9| Rint GND |7 8| +----------+
+---+--+---+ /TR1 |1 +--+ 14| VCC /TR2 |2 13| RCext TR1 |3 74 12| TR2 |4 122 11| Cext /RST |5 10| /Q |6 9| Rint GND |7 8| Q +----------+
+---+--+---+ /1TR |1 +--+ 16| VCC 1TR |2 15| 1RCext /1RST |3 14| 1Cext /1Q |4 74 13| 1Q 2Q |5 123 12| /2Q 2Cext |6 11| /2RST 2RCext |7 10| 2TR GND |8 9| /2TR +----------+
+---+--+---+ +---+---*---+ /1OE |1 +--+ 14| VCC | A |/OE| Y | 1A |2 13| /4OE +===+===*===+ 1Y |3 74 12| 4A | 0 | 0 | 0 | /2OE |4 125 11| 4Y | 1 | 0 | 1 | 2A |5 10| /3OE | X | 1 | Z | 2Y |6 9| 3A +---+---*---+ GND |7 8| 3Y +----------+
+---+--+---+ +---+---*---+ 1OE |1 +--+ 14| VCC | A | OE| Y | 1A |2 13| 4OE +===+===*===+ 1Y |3 74 12| 4A | X | 0 | Z | 2OE |4 126 11| 4Y | 0 | 1 | 0 | 2A |5 10| 3OE | 1 | 1 | 1 | 2Y |6 9| 3A +---+---*---+ GND |7 8| 3Y +----------+
+---+--+---+ +---+---*---+ ___ /1Y |1 +--+ 14| VCC | A | B |/Y | /Y = A+B 1A |2 13| /4Y +===+===*===+ 1B |3 12| 4B | 0 | 0 | 1 | /2Y |4 7402 11| 4A | 0 | 1 | 0 | 2A |5 10| /3Y | 1 | 0 | 0 | 2B |6 9| 3B | 1 | 1 | 0 | GND |7 8| 3A +---+---*---+ +----------+
+---+--+---+ S0 |1 +--+ 16| VCC S1 |2 15| /Y0 S2 |3 14| /Y1 CLK |4 74 13| /Y2 /EN2 |5 131 12| /Y3 EN1 |6 11| /Y4 /Y7 |7 10| /Y5 GND |8 9| /Y6 +----------+
+---+--+---+ +---+---*---+ __ 1A |1 +--+ 14| VCC | A | B |/Y | /Y = AB 1B |2 13| 4B +===+===*===+ /1Y |3 12| 4A | 0 | 0 | 1 | 2A |4 74132 11| /4Y | 0 | 1 | 1 | 2B |5 10| 3B | 1 | 0 | 1 | /2Y |6 9| 3A | 1 | 1 | 0 | GND |7 8| /3Y +---+---*---+ +----------+
+---+--+---+ _____________ A |1 +--+ 16| VCC /Y = ABCDEFGHIJKLM B |2 15| M C |3 14| L D |4 74 13| K E |5 133 12| J F |6 11| I G |7 10| H GND |8 9| /Y +----------+
+---+--+---+ +---+---*---+ _ _ 1A |1 +--+ 14| VCC | A | B | Y | Y = A$B = (A.B)+(A.B) 1B |2 13| 4B +===+===*===+ 1Y |3 12| 4A | 0 | 0 | 0 | 2A |4 74136 11| 4Y | 0 | 1 | Z | 2B |5 10| 3B | 1 | 0 | Z | 2Y |6 9| 3A | 1 | 1 | 0 | GND |7 8| 3Y +---+---*---+ +----------+
+---+--+---+ S0 |1 +--+ 16| VCC S1 |2 15| /Y0 S2 |3 14| /Y1 /LE |4 74 13| /Y2 /EN2 |5 137 12| /Y3 EN1 |6 11| /Y4 /Y7 |7 10| /Y5 GND |8 9| /Y6 +----------+
+---+--+---+ +---+----+----+---+---+---*---+---+---+---+ S0 |1 +--+ 16| VCC |EN1|/EN2|/EN3| S2| S1| S0|/Y0|/Y1|...|/Y7| S1 |2 15| /Y0 +===+====+====+===+===+===*===+===+===+===+ S2 |3 14| /Y1 | 0 | X | X | X | X | X | 1 | 1 | 1 | 1 | /EN3 |4 74 13| /Y2 | 1 | 1 | X | X | X | X | 1 | 1 | 1 | 1 | /EN2 |5 138 12| /Y3 | 1 | 0 | 1 | X | X | X | 1 | 1 | 1 | 1 | EN1 |6 11| /Y4 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | /Y7 |7 10| /Y5 | 1 | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 1 | GND |8 9| /Y6 | 1 | 0 | 0 | . | . | . | 1 | 1 | . | 1 | +----------+ | 1 | 0 | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | +---+----+----+---+---+---*---+---+---+---+
+---+--+---+ +---+---+---*---+---+---+---+ /1EN |1 +--+ 16| VCC |/EN| S1| S0|/Y0|/Y1|/Y2|/Y3| 1S0 |2 15| /2EN +===+===+===*===+===+===+===+ 1S1 |3 14| 2S0 | 1 | X | X | 1 | 1 | 1 | 1 | /1Y0 |4 74 13| 2S1 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | /1Y1 |5 139 12| /2Y0 | 0 | 0 | 1 | 1 | 0 | 1 | 1 | /1Y2 |6 11| /2Y1 | 0 | 1 | 0 | 1 | 1 | 0 | 1 | /1Y3 |7 10| /2Y2 | 0 | 1 | 1 | 1 | 1 | 1 | 0 | GND |8 9| /2Y3 +---+---+---*---+---+---+---+ +----------+
+---+--+---+ +---+---+---+---*---+ ____ 1A |1 +--+ 14| VCC | A | B | C | D |/Y | /Y = ABCD 1B |2 13| 2D +===+===+===+===*===+ |3 74 12| 2C | 0 | X | X | X | 1 | 1C |4 140 11| | 1 | 0 | X | X | 1 | 1D |5 10| 2B | 1 | 1 | 0 | X | 1 | /1Y |6 9| 2A | 1 | 1 | 1 | 0 | 1 | GND |7 8| /2Y | 1 | 1 | 1 | 1 | 0 | +----------+ +---+---+---+---*---+
+---+--+---+ +---+---+---+---*---+---+---+---+ /Y8 |1 +--+ 16| /Y0 | S3| S2| S1| S0|/Y0|/Y1|...|/Y9| /Y9 |2 15| /Y1 +===+===+===+===*===+===+===+===+ S0 |3 14| /Y5 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | S3 |4 74 13| /Y4 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 1 | VCC |5 141 12| GND | . | . | . | . | 1 | 1 | . | 1 | S1 |6 11| /Y6 | 1 | 0 | 0 | 1 | 1 | 1 | 1 | 0 | S2 |7 10| /Y7 | 1 | 0 | 1 | X | 1 | 1 | 1 | 1 | /Y2 |8 9| /Y3 | 1 | 1 | X | X | 1 | 1 | 1 | 1 | +----------+ +---+---+---+---*---+---+---+---+
+---+--+---+ +---+---+---+---*---+---+---+---+ /Y0 |1 +--+ 16| VCC | S3| S2| S1| S0|/Y0|/Y1|...|/Y9| /Y1 |2 15| S0 +===+===+===+===*===+===+===+===+ /Y2 |3 14| S1 | 0 | 0 | 0 | 0 | 0 | Z | Z | Z | /Y3 |4 74 13| S2 | 0 | 0 | 0 | 1 | Z | 0 | Z | Z | /Y4 |5 145 12| S3 | . | . | . | . | Z | Z | . | Z | /Y5 |6 11| /Y9 | 1 | 0 | 0 | 1 | Z | Z | Z | 0 | /Y6 |7 10| /Y8 | 1 | 0 | 1 | X | Z | Z | Z | Z | GND |8 9| /Y7 | 1 | 1 | X | X | Z | Z | Z | Z | +----------+ +---+---+---+---*---+---+---+---+
+---+--+---+ /A4 |1 +--+ 16| VCC /A5 |2 15| /A6 |3 14| Y3 /A7 |4 74 13| /A3 /A8 |5 147 12| /A2 Y2 |6 11| /A1 Y1 |7 10| /A9 GND |8 9| Y0 +----------+
+---+--+---+ /A4 |1 +--+ 16| VCC /A5 |2 15| /EO /A6 |3 14| /GS /A7 |4 74 13| /A3 /EI |5 148 12| /A2 Y2 |6 11| /A1 Y1 |7 10| /A0 GND |8 9| Y0 +----------+