Patent ID: 8310297
Filing Date: 2012-11-13
Classification: H01L,H03K

Abstract:
1. A semiconductor integrated circuit device comprising a functional circuit part that includes a plurality of field effect transistors to perform a predetermined function; a timer circuit that generates a timer output signal at every prescribed time interval; a mode control circuit that receives a first control signal and that when said first control signal is in an active state, generates a second control signal that is used to change a logic state of said functional circuit part, at every prescribed time interval, responsive to said timer output signal outputted from said timer circuit; an output control circuit that receives an output signal of said functional circuit part and controls output of said output signal; and a control signal generation circuit that generates a third control signal responsive to said second control signal and supplies said third control signal to said output control circuit, wherein during a time period when said functional circuit part changes a logic state responsive to said second control signal, said output control circuit, responsive to said third control signal, performs control so as not to transfer an output signal of said functional circuit part to an output of said output control circuit, but to hold and output an output signal of said functional circuit part immediately before said functional circuit part changes a logic state thereof responsive to said second control signal.