Published:2011/9/13 0:11:00 Author:Zoey | Keyword: Practical Technology, Digital, Integrated Circuit | From:SeekIC
1.Time fordata setup and maintainmentDigital Circuit mainly refers to synchronouscircuits , which means by using a clock, part of the circuit or all circuits can worksynchronously.synchronouscircuits usually adoptD trigger or J-Ktrigger tolatch the data. Using these triggers, we should pay attention to the latched signal and clock timing, if thereis anyproblem, it will cause circuit malfunction. Figure a, b, c refer to the time for data setup ts and maintainment th. Trigger D uses the clock edge to read the data input and output. Before the ascending edge appears, the data should be setup. This time margin is ts. Afer the ascending edge appears, the data needs to be maintained for some time, this time margin is th.The higher IC's working speed, the shorter time is required.
In practical, if ts and th are not long enough, the trigger will be in a multi-valued state, that is, in ameta-stable state,which means theinput processwillhave along delay time, the level will not be determined, and the trigger will havemalfunction.
Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/Digital_Circuit/Practical_Technology_Circuit_Diagram_for_Digital_Integrated_Circuit.html
Print this Page | Comments | Reading(3)
Code: