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# SYNCHRONOUS COUNTERS

الكلية كلية الهندسة     القسم  الهندسة الكهربائية     المرحلة 4
أستاذ المادة ايهاب عبد الرزاق حسين محمد       10/07/2018 17:59:46
Synchronous digital counters have a common clock signal that controls all flip-flop stages. Since a common clock controls all flip-flops simultaneously, there are no cumulative delays that result when a clock signal must ripple through the stages, as in the case of asynchronous counters. Synchronous counters can count up and down, and can be designed to produce special purpose count sequences of nonconsecutive numbers.
A digital counter is a device that generates binary numbers in a specified count sequence. The counter progresses through the specified sequence of numbers when triggered by an incoming clock waveform, and it advances from one number to the next only on a clock pulse. The counter cycles through the same sequence of numbers continuously so long as there is an incoming clock pulse.
The binary number sequence generated by the digital counter can be used in logic systems to count up or down, to generate truth table input variable sequences for logic circuits, to cycle through addresses of memories in microprocessor applications, to generate waveforms of specific patterns and frequencies, and to activate other logic circuits in a complex process.
Two common types of counters are decade counters and binary counters. A decade counter counts a sequence of ten numbers, ranging from 0 to 9. The counter generates four output bits whose logic levels correspond to the number in the count sequence.

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