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EP0333405A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Power supply potential rising detection circuit

Assignee: Fujitsu Ltd
•
Filing: 1989-03-13
•
Granted: —
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Expires: 2009-03-13
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Abstract

Abstract A power supply potential rising detection circuit includes a first and a second power supply terminal; a load element (R3); a transistor (T1) having a control gate (CG) and a floating gate (FG), the transistor (T1) being connected in series with the load element (R3) between the first and second power supply terminals. The circuit also includes means for supplying a first potential to the control gate (CG), the first potential being dependent on the power supply potential (V cc ) at the first power supply terminal and a switching element (T2) operatively connected to the floating gate (FG) and controlled by a second potential which is dependent on the power supply potential (V cc ), for reducing the potential of the floating gate (FG) and turning off the transistor (T1) when the power supply potential reaches a predetermined value. An output (V out ) from power supply potential rising detection circuit being taken from a connecting point between the load element (R3) and the transistor (T1). This circuit provides a reliable stable output with a low power consumption.

Inventors

  • 👤 Masanobu Yoshida

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-02 02:14
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/22; H03K17/223; H03K17/51; H03K17/56; H03K17/687; H03K2017/6878; H03K2217/00; H03K2217/0036

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 160 words
A power supply potential rising detection circuit, comprising, first and second supply terminals; a load element (R3); a transistor (T1) having a control gate (CG) and a floating gate (FG), the transistor (T1) being connected in series with the load element (R3) between the first and second power supply terminals; a means for supplying a first potential to the control gate (CG), the first potential being dependent on the power supply potential (V cc ) at the first power supply terminal; and, a switching element (T2) operatively connected to the floating gate (FG) and controlled by a second potential being dependent on the power supply potential (V cc ), for reducing the potential of the floating gate and turning OFF the transistor (T1) when the power supply potential (V cc ) reaches a predetermined value, a power supply potential rising detection signal (V out ) being output from a connecting point between the load element (R3) and the transistor (T1).
Claim 2
Dependent Claim 160 words
A power supply potential rising detection circuit, comprising, first and second supply terminals; a load element (R3); a transistor (T1) having a control gate (CG) and a floating gate (FG), the transistor (T1) being connected in series with the load element (R3) between the first and second power supply terminals; a means for supplying a first potential to the control gate (CG), the first potential being dependent on the power supply potential (V cc ) at the first power supply terminal; and, a switching element (T2) operatively connected to the floating gate (FG) and controlled by a second potential being dependent on the power supply potential (V cc ), for reducing the potential of the floating gate and turning OFF the transistor (T1) when the power supply potential (V cc ) reaches a predetermined value, a power supply potential rising detection signal (V out ) being output from a connecting point between the load element (R3) and the transistor (T1).
Claim 3
Dependent Claim 35 words
A power supply potential rising detection circuit according to claim 1, wherein the switching element is an enhancement type metal insulator semiconductor (MIS) transistor (T2) having a gate to which the second potential is supplied.
Claim 4
Dependent Claim 25 words
A power supply potential rising detection circuit according to claim 1 or 2, wherein the first potential is the power supply potential (V cc ).
Claim 5
Dependent Claim 29 words
A power supply potential rising detection circuit according to claim 1 or 2, wherein the first potential is a divided potential of the power supply potential (V cc ).
Claim 6
Dependent Claim 24 words
A power supply potential rising detection circuit according to any one of the preceding claims, wherein the second potential is the power supply potential.
Claim 7
Dependent Claim 32 words
A power supply potential rising detection circuit according to any one of claims 1 to 4, wherein the second potential is a divided potential of the power supply potential (V cc ).

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