Power supply threshold activation circuit

Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons

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Details

307200A, 307442, 307456, 307473, H03K 1722, H03K 1730, H03K 1762, H03K 19007

Patent

active

044814305

ABSTRACT:
An improved tristate enable circuit is described for activating a tristate enable gate to maintain the high impedance third state of a common bus tristate output device during "power down" and "power up" transitions of the common power supply V.sub.cc. The enable gate circuit element tends to turn off at a voltage level V.sub.cc2 generally greater than the voltage level V.sub.cc3 at which the tristate output device circuit elements turn off. As a result the high impedance state may be lost during "power down". A threshold activation circuit is coupled to the enable gate for activating the enable gate when the threshold activation circuit senses a higher common power supply voltage level V.sub.cc1. The threshold activation circuit operatively activates the enable gate over a voltage range from V.sub.cc1 to a lesser common power supply voltage level V.sub.cc4. Component values are selected for relating the voltage levels so that V.sub.cc1 >V.sub.cc2 and V.sub.cc3 >V.sub.cc4. As a result the turn off of circuit elements is sequenced by the threshold activation circuit.

REFERENCES:
patent: 3725675 (1973-04-01), Olsen
patent: 4174541 (1979-11-01), Schmitz
patent: 4260909 (1981-04-01), Dumbri et al.
patent: 4288865 (1981-09-01), Graham
patent: 4398106 (1983-08-01), Davidson et al.
patent: 4415817 (1983-11-01), Fletcher

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