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synchronous presettable 4-bit binary counter, synchronous clear 25 Ω series resistor 16 QS74FCT2163T: 74x2164 1 16k x 5 cache address comparator three-state (32) SN74ACT2164: 74x2166 1 16k x 5 cache address comparator with input latches three-state (32) SN74BCT2166: 74x2191 1 synchronous presettable 4-bit binary up/down counter, common clock
A 4-bit synchronous counter using JK flip-flops. In a synchronous counter, the clock inputs of the flip-flops are connected, and the common clock simultaneously triggers all flip-flops. Consequently, all of the flip-flops change state at the same time (in parallel). For example, the circuit shown to the right is an ascending (up-counting) four ...
The following is a list of CMOS 4000-series digital logic integrated circuits.In 1968, the original 4000-series was introduced by RCA.Although more recent parts are considerably faster, the 4000 devices operate over a wide power supply range (3V to 18V recommended range for "B" series) and are well suited to unregulated battery powered applications and interfacing with sensitive analogue ...
The most common example of this kind of software is the Espresso heuristic logic minimizer. Optimizing large logic systems may be done using the Quine–McCluskey algorithm or binary decision diagrams. There are promising experiments with genetic algorithms and annealing optimizations.
An animation of a frequency divider implemented with D flip-flops, counting from 0 to 7 in binary. For power-of-2 integer division, a simple binary counter can be used, clocked by the input signal. The least-significant output bit alternates at 1/2 the rate of the input clock, the next bit at 1/4 the rate, the third bit at 1/8 the rate, etc.
Before the development of high-speed serial technologies, the choice of parallel links over serial links was driven by these factors: Speed: Superficially, the speed of a parallel data link is equal to the number of bits sent at one time times the bit rate of each individual path; doubling the number of bits sent at once doubles the data rate.
The very fastest shifters are implemented as full crossbars, in a manner similar to the 4-bit shifter depicted above, only larger. These incur the least delay, with the output always a single gate delay behind the input to be shifted (after allowing the small time needed for the shift count decoder to settle; this penalty, however, is only incurred when the shift count changes).
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