Semiconductor integrated circuit device having circuit for gener

Details Semiconductor integrated circuit device having circuit for gener Semiconductor integrated circuit device having circuit for gener

1993-11-05

1995-04-18

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327198, 327545, H03K 5153, H03K 301

Patent

active

054081394

ABSTRACT:
A semiconductor integrated circuit device includes an internal circuit and a power-on reset signal generation circuit. The internal circuit includes an output node and an input for a power-on reset signal. The potential of the output node becomes indefinite immediately after the power-up. The internal circuit also has a function of forcing the potential of the output node to a high level in response to the power-on reset signal being applied for a sufficiently long period of time. The power-on reset signal generation circuit has a reset input, an input connected to the output node, and an output connected to the input for the power-on reset signal in the internal circuit. The power-on reset signal generation circuit starts generating the power-on reset signal in response to input of a reset signal, and stops the generation of the power-on reset signal in response to the potential of the output node attaining the high level. Since the generation of the power-on reset signal is not stopped until the potential of the first output node attains the first level, the internal circuit can surely reset the potential of the output node to the high level.

REFERENCES:
patent: 3764884 (1973-10-01), Reeve
patent: 3788454 (1988-11-01), Tanagawa et al.
patent: 5177375 (1993-01-01), Ogawa et al.
patent: 5309037 (1994-05-01), Curley et al.

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