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MC74HC4040A 数据表(PDF) 6 Page - ON Semiconductor |
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MC74HC4040A 数据表(HTML) 6 Page - ON Semiconductor |
6 / 8 page MC74HC4040A http://onsemi.com 6 Clock Reset Q1 1 2 4 8 16 32 64 128 256 512 1024 2048 4096 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q10 Q11 Figure 6. Timing Diagram Q9 Q12 APPLICATIONS INFORMATION Time–Base Generator A 60Hz sinewave obtained through a 100 K resistor connected to a 120 Vac power line through a step down transformer is applied to the input of the MC54/74HC14A, Schmitt-trigger inverter. The HC14A squares–up the input waveform and feeds the HC4040A. Selecting outputs Q5, Q10, Q11, and Q12 causes a reset every 3600 clocks. The HC20 decodes the counter outputs, produces a single (narrow) output pulse, and resets the binary counter. The resulting output frequency is 1.0 pulse/minute. HC4040A Figure 7. Time–Base Generator Clock Q5 Q10 Q11 Q12 VCC 13 12 10 9 1 2 4 5 8 1/2 HC20 1/2 HC20 6 1/6 of HC14A ≥20 pF 100 K 1.0 Pulse/Minute Output VCC 110 Vac 15 – 30 Volts |
类似零件编号 - MC74HC4040A |
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类似说明 - MC74HC4040A |
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