| 摘要 |
PROBLEM TO BE SOLVED: To provide a power-on clear circuit for generation and output of a clear signal which is not affected by a rising state of a power supply voltage. SOLUTION: A power-on clear circuit of the present invention includes: a pulse generating circuit 1 which generates a pulse by powering-on; a delay circuit 5 which delays and outputs the generated pulse; two-stages of cascaded inverters 6, 7 to which the delayed pulse is input; and a NOR circuit 8 having an input terminal, to which an output from a front-stage side of the delay circuit 5 is input, and an input terminal to which an output from the first stage of inverter 6 is input. The output of the NOR circuit 8 is regarded as a first clear signal which is not affected by a rising state of a power supply voltage, and the output of the inverter 7 is regarded as a second clear signal corresponding to the rising state of the power supply voltage. COPYRIGHT: (C)2011,JPO&INPIT |
