Ultra low current power-up signal switching circuit

Details Ultra low current power-up signal switching circuit Ultra low current power-up signal switching circuit

1997-04-08

1999-07-27

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Synchronizing

327198, H03L 700, H03K 302

Patent

active

059296739

ABSTRACT:
A power-up switching circuit which comprises a source of voltage (V.sub.CC) and a reference voltage circuit or voltage divider (R1, R2, N6) coupled to the source of voltage to provide a reference voltage. The reference voltage circuit also has a first switch (P5 and N5) in series therewith. Circuitry (MCAP1, P2, N2, P1, P4, D1) is provided including a first node (S2) responsive to ramping up of the voltage from the source of voltage at the first node to cause the reference voltage circuit including the first switch to be conducting to cause current to pass through the reference voltage circuit and provide a reference voltage. Circuitry (N1, D2) is provided which is responsive to arrival of the reference voltage at a predetermined voltage level to decrease the voltage at the first node sufficiently to electrically remove the first switch from the reference voltage circuit and disconnect the reference voltage circuit's current path from the source of voltage to ground. A second switch (P6) is coupled to the source of voltage and is responsive to the decrease of the voltage at the first node to couple the source of voltage to the circuitry (N1) to keep the first node (S2) low. Circuitry (P3, N3, P7, N7) is provided which is responsive to the decrease of the voltage at the first node to couple the source of voltage to the output terminal. The circuitry including a first node responsive to ramping up of the voltage from the source of voltage at the first node includes a capacitor coupled between the source of voltage and the first node.

REFERENCES:
patent: 4902907 (1990-02-01), Haga et al.
patent: 5172012 (1992-12-01), Ueda
patent: 5534804 (1996-07-01), Woo

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