| 摘要 |
<p>PURPOSE:To miniature an automatic clear circuit and to apply a monolithic IC to a desk electronic computer, etc., by providing a time constant circuit to the monolithic IC and performing a clearing action to the power supply voltage having a fast rise through said time constant circuit. CONSTITUTION:MISFETs Q1 and Q2 as well as FETs Q3 and Q4 which form a source follower circuit using the power supply voltage VDD as an input are provided to a monolithic IC. The output of this IC is supplied to an inverter circuit consisting of FETQ8 and Q6. The output of the inverter circuit is supplied to a time constant circuit consisting of FETs Q7-Q10. Then a capacitor C is charged with the VDD via FETs Q7-Q9 serving as resistance means respectively. Clocks phi1 and phi2 are applied to FETs Q8 and Q9 of said time constant circuit. Thus a time constant is substantially increased. In this case, the output of the time constant circuit is applied to FETs Q13-Q18 forming a latch circuit via a buffer circuit consisting of FETs Q11 and Q12. Thus a clearing action is accelerated by the time constant circuit, and an automatic clear circuit is miniaturized.</p> |
