Reference voltage generating circuit, semiconductor memory device and burn-in method therefor
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorsMotoko Hara, Seiji Sawada
Life of this patent
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Abstract
A reference voltage generating circuit having a fuse for controlling resistance includes a burn-in circuit for supplying burn-in voltage between opposite terminals of the fuse when a control signal is inputted to the burn-in circuit.
Claims20
A reference voltage generating circuit having specific terminals connected to terminals of at least one fuse for controlling resistance, said reference generating circuit comprising:
- a burn-in circuit connected to terminals of the at least one fuse, said burn-in circuit supplying a burn-in voltage between the terminals of the fuse when a control signal is inputted to the burn-in circuit, said burn-in circuit including at least
- a switching circuit electrically disconnecting said specific terminals from the terminals of the at least one fuse when the control signal is inputted;
- and
- a voltage supply circuit supplying a voltage between the terminals of the at least one fuse when the control signal is inputted.
A burn-in method for a semiconductor memory device having a plurality of wires, comprising:
- a burn-in step of electrically disconnecting wires from the semiconductor memory device, and supplying a voltage between the wires;
- and
- a selecting step of measuring a resistance of the wires in order to select the semiconductor memory device having a certain resistance after the burn-in step.
A semiconductor memory device holding plural wires at substantially the same electric potential in operation mode, comprising:
- plural first terminals selectively electrically connected to the plural wires and holding the plural wires at substantially the same electric potential when electrically connected to the plural wires;
- plural second terminals selectively electrically connected to the wires and supplying a burn-in voltage between the plural wires when electrically connected to the plural wires;
- and
- a switching circuit electrically selectively disconnecting said plural first terminals from the plural wires and electrically connecting said plural second terminals to the plural wires.
A burn-in circuit controlling the connection and voltage of at least one electrical element, said circuit comprising:
- a switching circuit electrically disconnecting a terminal of the at least one electrical element from a reference connection in response to a control signal;
- and
- a voltage supply circuit supplying a voltage to the disconnected terminal of the at least one electrical element in response to the control signal.
Dependencies are inferred from the claim text.