EE2731_Class_Notes_02-14

C a b d c a incorrectversionofcascadingtwo flipflops

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Unformatted text preview: called output enable. When this input is asserted the device behaves like a normal gate, otherwise, the output behaves like anC' A circuit. open Y 0 0 1 1 0 1 0 1 1 0 Hi-Z Hi-Z Tri­State Devices Tri­State Devices One application of tri-state devices is to be used to connect several devices to a single bus. When changing which output is connected to bus one must ensure that all outputs must first go into the hi-Z state thus avoiding the possibility that two outputs would be connected to the bus simultaneously. Schmitt Trigger Gates Used for wave-shaping purposes. Level sensitive with output switching state at two distinct trigger levels, called lower trigger level – VT- and upper trigger level – VT+ . The difference between the two trigger levels is called hysteresis ( VT+ - VT- ). Shown below is the input-output transfer characteristic. Schmitt Trigger Gates Transforming an analog input signal into a clean square form signal....
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