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US 5,349,244 AGranted
Initialization circuit for memory registers
OwnerPierangelo Confalonieriinventor
Life of this patent
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Abstract
An initialization circuit, particularly for memory registers, being of a type which comprises a signal input to which a supply voltage is applied, and an initialization output at which a voltage signal is produced which is equal to the supply voltage up to a predetermined tripping value for the circuit, further comprises a second output connected to the register and being also an initialization output driven to a null voltage value upon the supply voltage dropping below the tripping value.
Claims20
An initialization circuit for memory registers, comprising:
- a signal input terminal for receiving a supply voltage, the supply voltage increasing from a null voltage upon initialization;
- a first initialization circuit portion connected to the signal input terminal, the first initialization circuit portion producing a first initialization voltage in response to the supply voltage, the first initialization voltage being proportional to the supply voltage when the supply voltage is below a predetermined tripping value and being a null voltage when the supply voltage exceeds the tripping value;
- a second initialization circuit portion for producing a second initialization voltage in response to the supply voltage, the second initialization voltage being proportional to the supply voltage until the supply voltage exceeds a second tripping value, the second initialization voltage being equal to a null voltage thereafter;
- a first output terminal connected to the first initialization circuit portion for providing a first output voltage corresponding to the first initialization voltage;
- and
- a second output terminal connected to the second initialization circuit portion for providing a second output voltage corresponding to the second initialization voltage.
3 more elements
A circuit for electrical initialization, comprising:
- an initialization circuit portion for producing a first initialization output voltage, the initialization circuit portion having a supply voltage input terminal for receiving a supply voltage and a voltage output terminal, the first initialization output voltage being proportional to the supply voltage at supply voltage levels below a threshold voltage and the first initialization output voltage being equal to a null voltage at supply voltage levels above the threshold voltage;
- an output driver portion connected to the output terminal of the initialization circuit portion, the output driver portion having an output terminal and producing a voltage proportional to the first initialization output voltage at the output terminal;
- and
- a second circuit portion connected to the first voltage output terminal, the second circuit portion having a second initialization output terminal and producing a second initialization output voltage at the second initialization output terminal upon application of a supply voltage to the supply voltage input terminal, the second initialization output voltage being proportional to the supply voltage upon an initial application of the supply voltage until the supply voltage reaches the threshold voltage and the second initialization output voltage being a null voltage thereafter.
1 more element
An initialization circuit for memory registers, comprising:
- a signal input terminal for receiving a supply voltage, the supply voltage increasing from a null voltage upon initialization;
- a first initialization circuit portion connected to the signal input terminal, the first initialization circuit portion producing a first initialization voltage in response to the supply voltage, the first initialization voltage being proportional to the supply voltage when the supply voltage is below a predetermined first tripping value and being a null voltage when the supply voltage exceeds the tripping value;
- a second initialization circuit portion connected to receive the first initialization voltage from the first initialization circuit portion, the second initialization circuit portion producing a second initialization voltage in response to the first initialization voltage, the second initialization voltage being proportional to the first initialization voltage until the first initialization voltage exceeds a second tripping value, the second initialization voltage being equal to a null voltage thereafter unless the supply voltage equals the null voltage after having exceeded the second tripping value;
- a first output terminal connected to the first initialization circuit portion for providing a first output voltage corresponding to the first initialization voltage;
- and
- a second output terminal connected to the second initialization circuit portion for providing a second output voltage corresponding to the second initialization voltage.
3 more elements
Dependencies are inferred from the claim text.