signal blclamp is supplied to the gate of the mosfet 31 a signal tg 1 is supplied to the gate of the mosfet 33 a signal tg 1 b is supplied to the gate of the mosfet 34 the other end of the current path of each of the mosfets 33 and 34 is connected to a corresponding one of the input and output terminals of the latch 32 the operation of the latch 32 is controlled by complementary sense amplifier enable signals senb and sen and complementary latch control signals latb and lat the current path of the mosfet 42 is connected between the node no and the power supply vcc a signal ps is supplied to the gate of the mosfet 42 the capacitor c 2 is connected between the node no and a ground point vss one end of the current path of the mosfet 43 is also connected to the node no a signal reg is supplied to the gate of the mosfet 43 one end of the current path of the mosfet 45 is connected to the other end of the current path of the mosfet 43 the gate node n 2 of the mosfet 45 is connected to one end of the current path of the mosfet 44 the capacitor c.