The present invention teaches a level shift device and a related method. The level shift device contains a first input terminal, a second input terminal, a number of output terminals, and a pulse generation circuit. The first input terminal is for receiving a first pulse input signal. The second input terminal is for receiving a second pulse input signal. The pulse generation circuit cyclically produces pulse output signals, one on each output terminal, according to the first and second pulse input signals. The level shift device further contains a third input terminal for receiving a third pulse input signal. The pulse generation circuit controls the number of pulse output signals produced within each cycle according to third pulse input signal. The present invention is able to produce various numbers of pulse output signals, which is flexible for different applications without investing a new design.