Lecture No. 27 Sequential Logic

Recap 555 Monostable, Astable Timing problems (hold time) Clock Skew (clock delay) Race Conditions

Recap Asynchronous Counters Mod-n Counters Decade Counter Propagation delay Propagation Delay at high frequency Mod-n Counters Decade Counter Integrated Circuit 74LS93A counter MOD-16 and Decade Counters MOD-50 Counter

Asynchronous Counters Down Counters (fig 1) Down Counter with truncated sequence (fig 2)

Synchronous Counters Synchronous Counter (fig 3) 3-bit counter (fig 4) 4-bit counter (fig 5) Synchronous Decade Counter (tab 1 fig 6)