Figure 1 Use a portion of a programmable-logic device or gate array to implement a Schmitt-trigger buffer (a) by adding either two (b) or four external resistors (c). Thanks to its internal hysteresis ...
D-type flip-flops, with the invertedoutput connected to theD input, can toggle a clock signal. Ifyour circuit has an extra Schmitt-triggerinverter gate, you can use it to accomplishthe same thing.