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The counter may use for to demonstrate that the product the active status, generally speaking is mainly uses for to express the product already completed how many shares to fold printed book-sheets into pages matches the page work. The CD 4518 pairs 2--10 enter the system synchronous counter, is the commonly used counter electric circuit, mainly by the P trench, N the trench enlargement mode MOS tube is composed the elemental area by the supplementary way, each counter is composed four BCD synchronous counter by four level of D triggers, two counters have independence clock out-port CP respectively, enables to carry E and the elimination carries CR. When clock by CP end input, clock pulse forward border flip-flop number counting (this time E=H), when clock by E end input, clock pulse negative border flip-flop number counting (this time CP=L). When CR=H, no matter CP and the E input end is any condition, counter all outputs are L, this circuit structure and performance with American RCA Corporation's CD 4518 consistent. This article introduced the CD 4518 principles, the parameter and the working condition, introduced its design rule and the design domain with emphasis, and has made the detailed analysis to its principle of work and the working pattern.

Counter can be used to display the working status of products in general is mainly used to indicate how many products have completed the page with the work of folding. CD 4518 双 2 - 10 synchronous counter, the counter circuit is used mainly by the P-channel, N-channel enhancement-type MOS control the basic unit composed of a complementary way, each counter by the four D-type flip-flop 4 synchronous BCD counters, two counters have separate clock output CP, so to clear the terminal end of E and CR. When the clock input from the CP side, the clock pulse positive edge-triggered counter count (in this case E = H), the clock input from the E side, the negative clock edge triggered counter count (now CP = L). In CR = H, and when the CP E regardless of what state the input, output of the counter were all L, the circuit structure and performance are the company with the U.S. RCA CD 4518 is consistent.