two-gate bistable

46 two-gate bistable Probably unequalled as to its simplicity given the digital function, this circuit may serve as a single- button on/off control for incorpor- ation in a wide variety of electronic designs. The operation of the pro- posed bistable is best understood if it assumed that the input of Schmitt- trigger inverter Ni is at logic high level; the output of N2 will therefore be high as well. It is seen that the ca- nS_1 i Pll CI N1...N2 = 1/3 IC1= 40106 N2 depression of the button pulls the in- put of Ni to logic low level, causing the bistable to toggle; the capacitor is charged via the 1 M resistor, and the circuit will change state again at the next switch action. The indicated resistor values have been found to of- fer optimum stability of the bistable, while the use of Schmitt-trigger 00n N1 86472-1 pacitor is discharged because of the low output level of Ni. Therefore, correct operation. HS CMOS inverters is essential to the