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4 / 14 page FUNCTIONAL DESCRIPTION (continued) RE-TRIGGERED OPERATION When a second trigger pulse follows the first its ef- fect will depend on the state of the multivibrator. If the capacitor Cx is being charged the voltage level of R/C external falls to Vrefl again and Q remains high i.e. the retrigger pulse arrives in a time shorter than the period Rx ⋅ Cx seconds, the capacitor charging time constant. If the second trigger pulse is very close to the initial trigger pulse it is ineffective ; i.e. the second trigger must arrive in the capacitor discharge cycle to be ineffective; Hence the mini- mum time for a second trigger to be effective de- pends on VCC and Cx. RESET OPERATION CL is normally high. If CL is low, the trigger is not ef- fective because Q output goes low and trigger con- trol flip-flop is reset. Also transistor Op is turned on and Cx is charged quicky to VCC. This means if CL input goes low, the IC becomes waiting state both in operating and non operating state. TRUTH TABLE INPUTS OUTPUTS NOTE AB CL Q Q H H OUTPUT ENABLE X L H L H INHIBIT H X H L H INHIBIT L H OUTPUT ENABLE L H OUTPUT ENABLE X X L L H INHIBIT X: Don’t Care Z: High Impedance INPUT AND OUTPUT EQUIVALENT CIRCUIT M54/M74HC123/123A 4/14 |
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