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MC74AC4020N Scheda tecnica(PDF) 1 Page - Motorola, Inc |
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MC74AC4020N Scheda tecnica(HTML) 1 Page - Motorola, Inc |
1 / 5 page 5-1 FACT DATA 14Stage Binary Ripple Counter The MC74AC4020 consists of 14 master-slave flip-flops with 12 stages brought out to pins. The output of each flip-flop feeds the next and the frequency at each output is half that of the preceding one. The state of the counter advances on the negative-going edge of the Clock input. Reset is asynchronous and active-high. State changes of the Q outputs do not occur simultaneously because of internal ripple delays. Therefore, decoded output signals are subject to decoding spikes and may have to be gated with the Clock of the MC74AC4020 for some designs. • 140 MHz Typ. Clock • Outputs Source/Sink 24 mA • Operating Voltage Range: 2.0 to 6.0 V • High Noise Immunity 15 16 14 13 12 11 10 2 1 3 4 5 6 7 VCC 9 8 Q11 Q10 Q8 Q9 RESET CLK Q1 Q12 Q13 Q14 Q6 Q5 Q7 Q4 GND FUNCTION TABLE Clock Reset Output State L No Change L Advance to next state X H All Outputs are low MC74AC4020 14-STAGE BINARY RIPPLE COUNTER N SUFFIX CASE 648-08 PLASTIC D SUFFIX CASE 751B-05 PLASTIC LOGIC DIAGRAM CLOCK 10 11 RESET PIN 16 = VCC PIN 8 = GND 9 7 5 4 6 13 12 14 15 1 2 3 Q1 Q4 Q5 Q6 Q7 Q8 Q9 Q10 Q11 Q12 Q13 Q14 |
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