Flip-flop can be operated either as a set-reset flip-flop or as a toggled complementing flip-flop.
The NL505 Flip-flop can be operated either as a set-reset flip-flop or as a toggled complementing flip-flop. This makes it useful in setting up conditional and single-shot stimuli, and testing logic outputs for the presence of pulses, logic levels etc. It has three inputs, Set, Complement and Clear, and two outputs (Q and Q') all of which drive or are driven from TTL logic (ie +5V and 0V). An LED indicator is illuminated when the Q output is at a high level.
The table below shows the relationship between inputs and outputs.
Where a 1 is a logic high (+5V)
0 is a logic low (0V) or unconnected inputs
X is irrelevant
QO is the previous output
^ is a positive going pulse * This is a non-stable situation, it will only remain whilst Set and Clear are both held high. The Set and Clear inputs override the Complement input. That is why the output is only affected by the complement input when both of these are low.
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