Hi friends: I got a serious problem with 74LS123. 74LS123 has been configured as following: 1CLR-----VCC 1A-------GND 1CEXT----100PF( one pin is conected to GND ) 1REXT----120K 1B-------INPUT 1Q-------OUPUT Input keeps changing from 1V to 3.5V repeatedly. Why this chip can not be triggered? Beg for you help....
A VERY personal opinion I call these devices one shot in the foot. I will, if needed, use 5 chips to avoid using a one shot in the foot. The one shot in the foot chips are the most noise sensitive chips you can find. The mixture of analog and digital circuitry makes for a device that acts different from all other chips of the same family. My opinion Erik