Service signal generating circuit

Abstract

To reliably relieve a circuit having a defective part by outputting a repair signal in which it is detected correctly whether a fuse is cut off. This circuit is provided with a first p-channel transistor in which the source is connected to a power source and a reset signal is inputted to the gate, an n-channel transistor in which the source is connected to another terminal of a grounded fuse, the drain is connected to a drain of the first p-channel transistor, and the reset signal is inputted to the gate, a first p-channel transistor in which the drain is connected to the node N1 being a connection point of the first p-channel transistor and the n-channel transistors, the source is connected to a power source and which has large on-resistance than that of the n-channel transistor, and an inverter.

Description

technical field [0001] The present invention relates to a repair signal generating circuit mounted on a semiconductor integrated circuit for generating a repair signal indicating that a malfunction generated during the manufacturing process of the semiconductor integrated circuit is replaced with a redundant circuit. Background technique [0002] With the development of semiconductor process technology in recent years, microfabrication technology has been continuously improved, and the integration degree of semiconductor integrated circuits has increased rapidly, thereby increasing the circuit scale. In addition, recently, in order to obtain effects such as increased memory bandwidth and low power consumption, logic circuits and large-scale memory devices are mixedly mounted on the same semiconductor chip. [0003] If a large-scale system circuit is mounted on the same semiconductor chip, it is possible to reduce the area of ​​the system substrate when semiconductor devices ...

AI Technical Summary

Problems solved by technology

[0012] However, in the above-mentioned conventional inspection signal generating circuit, since the capacity of the capacitor 101 increases due to the cutting of the fuse 103, the voltage on the input side of the inverter 104 will be incomplete depending on the manufacture of the inspection signal generating circuit. There is a problem that the switching state of the fuse 103 cannot be detected reliably

[0013] In addition, if the fuse 103 is not completely cut off, a small current flows through the fuse 103, and there is also a problem that low power consumption cannot be achieved.

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