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About Digital Counters
Digital counters are integrated circuits (ICs) that count events in computers and other digital systems. Because they must remember past states, digital counters include memory. Generally, digital counters consist of bistable devices or bistable multivibrators called flip-flops. The number of flip-flops and the way in which they are connected determines the number of states and the sequence of states that digital counters complete in each full cycle. The way in which devices are clocked determines whether digital counters are categorized as synchronous or asynchronous. In synchronous devices, one clock triggers all of the flip-flops simultaneously. With asynchronous or ripple counters, an external clock pulse triggers only the first first-flop. Each successive flip-flop is then clocked by one of the outputs (Q or Q’) of the previous flip-flop. Some digital counters can operate either synchronously or asynchronously. Devices can count in an increasing sequence, a decreasing sequence, or in either increasing or decreasing sequences.
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Engineering Web: Digital Counters - Machine Design
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