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A binary counter can represent 2 N states, where N is the number of bits in the code, whereas a straight ring counter can represent only N states and a Johnson counter can represent only 2N states. This may be an important consideration in hardware implementations where registers are more expensive than combinational logic.
Up/down counter – counts up and down, as directed by a control input, or by the use of separate "up" and "down" clocks. Ring counter – formed by a "circular" shift register. Johnson counter – a twisted ring counter. Gray-code counter – outputs a sequence of Gray codes. Shift register generator counter – based on a shift register with ...
Robert Royce "Bob" Johnson (1928–2016) was an American inventor, engineer, computer pioneer, and professor. Besides the Johnson counter , a type of ring counter that was named for him, he developed the method of encoding numbers on checks still in use as of 2018.
Gray code to decimal decoder 16 SN7444A: 74x45 1 ... 5-stage ÷10 Johnson counter 16 CD74HC4017: 74x4020 1 14-stage binary counter 16 SN74HC4020: 74x4022 1
The counter itself must count in Gray code, or if the counter runs in binary then the output value from the counter must be reclocked after it has been converted to Gray code, because when a value is converted from binary to Gray code, [nb 1] it is possible that differences in the arrival times of the binary data bits into the binary-to-Gray ...
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English: 4-bit Johnson counter using four D-Type Flip Flops. Synchronous Clock and Reset line shown. Synchronous Clock and Reset line shown. Русский: 4-х битовый счётчик, работающий в коде Джонсона, реализованный на D-триггерах.
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