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....