Here is how the circuet looks.
Initally the output the D flip flop is HIGH, when the there is HIGH to LOW input across the multivirator, it create a pulse of 200ms, which is connected to the Clear pin of the Flip Flop.
Shouldn't this happen?
- Q outputs Low
- Causes U5A to output HIGH
- Which in turn causes the Flip-Flop Set to HIGH
- Q outputs HIGH
- Causes U5A to output LOW
- Due to reset still HIGH causing Q to output Low
- Cycle Repeats
But this does not happen, can anybody explain why?
Is it due to propagation delay time of each device?
Propagation of Flip flop is around 150ns whereas of NAND is 200ns, there are actually 4 more NAND (not shown connected as not gates).