Semiconductor integrated circuit device having power on reset ci

Details Semiconductor integrated circuit device having power on reset ci Semiconductor integrated circuit device having power on reset ci

1996-07-15

1998-03-31

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327142, 327146, 327198, H03K 1722, H03K 2340

Patent

active

057342806

ABSTRACT:
A semiconductor integrated circuit device has an internal circuit node reset signal generation circuit for inverting an output signal with a predetermined time lag immediately after application of power. The internal circuit node reset generation circuit comprises an initial stage power on reset signal generation circuit, an initial stage signal transmission circuit for inputting a signal outputted by the initial stage power on reset signal generation circuit, a final stage power on reset signal generation circuit for inputting a signal outputted by the initial stage signal transmission circuit, and a final stage signal transmission circuit for inputting a signal outputted by the power on reset signal and outputting the output signal. When an operating source voltage lower limit value of the initial stage power on reset signal generation circuit is lower than that of the final stage signal transmission circuit and a source voltage has not reached a predetermined value, it is possible for the final stage power on reset signal generation circuit to generate an output signal without being influenced by the initial stage power on reset signal generation circuit, and to output an internal circuit inactivation signal for a certain time after application of power, and an inversion signal after passing the certain time. As a result, a certain internal circuit initialization time may be exactly established.

REFERENCES:
patent: 3745380 (1973-07-01), Kitajima et al.
patent: 4746822 (1988-05-01), Mahoney
patent: 5467039 (1995-11-01), Bae

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