The optoelectronic logic element AND, OR and XOR is considered, the output signal of which can be inverted when the input control signal is applied, thereby converting the logic element into NAND, NOR ...

A close look at the circuit reveals that it consists of a discrete D-type flip-flop formed by NAND gates U1a-U1c. The setup delay of the LS series gates is around 10 ns. This causes the settling ...