Semiconductor large scale integrated circuit with noise cut circuit.

摘要

In a semiconductor large scale integrated circuit including a plurality of input terminals, sequential circuits (FF) and output buffer circuits (OB), and further comprising a noise cut circuit, the semiconductor large scale integrated circuit comprises: a sense amplifier (SA) connected to an input terminal of the output buffer circuit (OB) for detecting a change of signal level at the input terminal and for generating an edge detection signal; a pulse generator (PG) connected to the sense amplifier (SA) for outputting a trigger pulse signal having a predetermined pulse width based on a plurality of the edge detection signals; and at least one tri-state circuit (TS) connected between the input terminal and the sequential circuit (FF), and having a control terminal for receiving the trigger pulse signal for obtaining a high impedance state at an output line of the tri-state circuit during a predetermined period based on the trigger pulse signal input from the pulse generator (PG).