Patent ID: 7397286
Filing Date: 2008-07-08
Classification: G11C,H03K

Abstract:
1. A flip-flop circuit comprising a first latch circuit including a first inverter circuit and a second inverter circuit as well as a first equalizer circuit equalizing the potential of an output node of said first inverter circuit and the potential of an output node of said second inverter circuit with each other, wherein a first power supply line capable of switching a supplied potential between a fixing potential supplied for fixing the potential of said output node of said first inverter circuit and the potential of said output node of said second inverter circuit and a floating potential supplied for floating the potential of said output node of said first inverter circuit and the potential of said output node of said second inverter circuit is connected to said first latch circuit, one of said output node of said first inverter circuit and said output node of said second inverter circuit is connected to an output node of said first latch circuit, the flop-flop circuit further comprising a second latch circuit including a third inverter circuit having an output node connected to said output node of said first latch circuit, a fourth inverter circuit and a second equalizer circuit equalizing the potential of said output node of said third inverter circuit and the potential of an output node of said fourth inverter circuit with each other, wherein a second power supply line capable of switching a supplied potential to said fixing potential supplied for fixing the potential of said output node of said third inverter circuit and the potential of said output node of said fourth inverter circuit and said floating potential supplied for floating the potential of said output node of said third inverter circuit and the potential of said output node of said fourth inverter circuit is connected to said second latch circuit, and at least one of the first equalizer circuit and the second equalizer circuit consists of one transistor.