Patent ID: 6205079
Filing Date: 2001-03-20
Classification: G11C

Abstract:
A semiconductor integrated circuit comprising:a first node for receiving a first voltage which is externally supplied;a second node for receiving a second voltage that differs in magnitude from the first voltage;a first internal power supply circuit responsive to at least the second voltage on the second node for producing a first internal supply voltage that differs in magnitude from the first voltage;a first voltage detecting circuit connected to receive the second voltage from the second node for, upon detecting that the magnitude of the voltage on the second node has reached a first specified value, producing a first detect signal;a second internal power supply circuit responsive to at least the second voltage on the second node for producing a second internal supply voltage that differs in magnitude from the second voltage;a second voltage detecting circuit connected to receive the second internal supply voltage from the second internal power supply circuit for, upon detecting that the magnitude of the second internal supply voltage has reached a second specified value, producing a second detect signal which causes the first internal power supply circuit to start producing the first internal supply voltage; anda clamp circuit coupled to an output of the first internal power supply circuit and the first node for, upon receiving the second detect signal, releasing a short-circuited state of the output of the first internal power supply circuit and the first node.