Published:2011/7/23 1:15:00 Author:Joyce | Keyword: RS , Trigger , Operating Principle | From:SeekIC
As shown in the figure is a circuit in which 555 works as a RS trigger. If the control voltage on the controlling end feet 5 is removed, there will be no need to connect any external component with 555, but add negative and positive control pulse on feet 2 and 6 respectively to constitute a RS trigger circuit. End R is the reset control input end feet 6, which is also called threshold end (TH);end S is the set control input feet 2, which is also called set trigger end T. The output end (feet 3) within the chip is actually push-pull output, whose low level output is only about 0.3 V and whose high level is close to VDD, so it has a very strong load capacity
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