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MC74HC4040ANG Datasheet(PDF) 7 Page - ON Semiconductor |
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MC74HC4040ANG Datasheet(HTML) 7 Page - ON Semiconductor |
7 / 10 page MC74HC4040A http://onsemi.com 7 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 8. 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 9. 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 1.0 Pulse/Minute Output ≥20pF 1.0M 120Vac 60Hz NOTE: Ground MUST be isolated by a transformer or opto−isolator for safety reasons. |
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