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US 5,331,209 AGranted
Auto-reset circuit with improved testability
AssigneeOki Electric Industry Co., Ltd.
InventorsYoshimitu Fujisawa, Yasuhiro Shin
Life of this patent
Estimating the term…
Abstract
A first active element has its first terminal coupled to a first power-supply terminal, its second terminal coupled through a resistor to a second power-supply terminal, and its third terminal coupled to the second power-supply terminal, or to a control signal input terminal that is normally at the same potential as the second power-supply terminal. A second active element has its first terminal coupled to the second power-supply terminal, its second terminal coupled through a resistor to the first power-supply terminal, and its third terminal coupled to the second terminal of the first active element. A reset signal is taken from the second terminal of the second active element. The control signal can be used to prevent current flow during static current measurements.
Claims16
An auto-reset circuit for generating a power-up reset signal, comprising:
- a first power-supply terminal for receiving a first potential;
- a second power-supply terminal for receiving a second potential different from said first potential;
- an output terminal for output of the reset signal;
- a first active element having first and second terminals, and a third terminal for controlling conduction between the first and second terminals, the first terminal being coupled to said first power-supply terminal, the third terminal being coupled to said second power-supply terminal;
- a first resistor coupled between the second terminal of the first active element and said second power-supply terminal;
- a second resistor coupled between said first power-supply terminal and said output terminal;
- a second active element having first and second terminals, and a third terminal for controlling conduction between the first and second terminals, the first terminal being coupled to said second power-supply terminal, the second terminal being coupled to said output terminal, and the third terminal being coupled to the second terminal of the first active element;
- a third resistor coupled between the second terminal of the first active element and the third terminal of the second active element;
- and
- a capacitor coupled between the third terminal of the second active element and said second power-supply terminal.
7 more elements
An auto-reset circuit for generating a power-up reset signal, comprising;
- a first power-supply terminal for receiving a first potential;
- a second power-supply terminal for receiving a second potential different from said first potential;
- an output terminal for output of the reset signal;
- a first control signal input terminal for input of a first control signal to halt current flow during static current measurements;
- a first active element having first and second terminals, and a third terminal for controlling conduction between the first and second terminals, the first terminal being coupled to said first power-supply terminal, and the third terminal being coupled to said first control signal input terminal;
- a first resistor coupled between the second terminal of the first active element and said second power-supply terminal;
- a second resistor coupled between said first power-supply terminal and said output terminal;
- a second active element having first and second terminals, and a third terminal for controlling conduction between the first terminal and second terminal, the first terminal of which is coupled to said second power-supply terminal, the second terminal of which is coupled to said output terminal and the third terminal of which is coupled to the second terminal of the first active element;
- a second control signal input terminal, for input of a second control signal to control output of said reset signal during static current measurements;
- and
- a logic gate having input terminals coupled to said output terminal and said second control signal input terminal, for gating said reset signal.
8 more elements
An auto-reset circuit for generating a power-up reset signal, comprising;
- a first power-supply terminal for receiving a first potential;
- a second power-supply terminal for receiving a second potential different from said first potential;
- an output terminal for output of the reset signal;
- a first control signal input terminal for input of a first control signal to halt current flow during static current measurements;
- a first active element having first and second terminals, and a third terminal for controlling conduction between the first and second terminals, the first terminal being coupled to said first power-supply terminal, and the third terminal being coupled to said first control signal input terminal;
- a first resistor coupled between the second terminal of the first active element and said second power-supply terminal;
- a second resistor coupled between said first power-supply terminal and said output terminal;
- a second active element having first and second terminals, and a third terminal for controlling conduction between the first and second terminals, the first terminal being coupled to said second power-supply terminal, the second terminal being coupled to said output terminal, and the third terminal being coupled to the second terminal of the first active element;
- a third resistor coupled between the second terminal of said first active element and the third terminal of said second active element;
- and
- a capacitor coupled between the third terminal of said second active element and said second power-supply terminal.
8 more elements
An auto-reset circuit for generating a power-up reset signal, comprising:
- a first power-supply terminal for receiving a first potential;
- a second power-supply terminal for receiving a second potential different from said first potential;
- an output terminal for output of the reset signal;
- a first active element having first and second terminals, and a third terminal for controlling conduction between the first terminal and second terminal, the first terminal being coupled to said first power-supply terminal, and the second terminal being coupled to the third terminal;
- a first resistor coupled between the second terminal of said first active element and said second power-supply terminal;
- a second resistor coupled between said first power-supply terminal and said output terminal;
- a third resistor coupled to the second terminal of said first active element;
- a capacitor coupled to said third resistor and said second power-supply terminal, said third resistor and said capacitor thus being coupled in series between the second terminal of said first active element and said second power-supply terminal;
- and
- a second active element having first and second terminals, and a third terminal for controlling conduction between the first and second terminals, the first terminal being coupled to said second power-supply terminal, the second terminal being coupled to said output terminal, and the third terminal being coupled to a circuit point between said third resistor and said capacitor.
7 more elements
Dependencies are inferred from the claim text.