Logic circuit for controlling a supply on drive pulses to regulate an output level

摘要

A logic circuit has means for controlling an active pull-down circuit in response to a detected result of an output level detection circuit. This prevents an undershoot of the output. Accordingly, it is possible to prevent malfunctions of a logic circuit in the next stage. It also prevents a prolongation of the transition time at the time of a rise of the output potential. Moreover, it reduces the power consumption of the circuit as a whole by decreasing a wasteful current from the output transistor of the emitter-follower to the active transistor.