H - Electricity – 03 – K
Patent
H - Electricity
03
K
323/4
H03K 17/00 (2006.01) G05F 1/44 (2006.01) H03K 17/22 (2006.01) H03K 19/082 (2006.01)
Patent
CA 1201765
Title of the Invention POWER SUPPLY THERESHOLD ACTIVATION CIRCUIT Abstract of the Disclosure 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 Vcc. The enable gate circuit element tends to turn off at a voltage level Vcc2 generally greater than the voltage level Vcc3 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 Vcc1. The threshold activation circuit operatively activates the enable gate over a voltage range from Vcc1 to a lesser common power supply voltage level Vcc4. Component values are selected for relating the voltage levels so that Vcc1 > Vcc2 and Vcc3 > Vcc4. As a result the turn off or circuit elements is sequenced by the threshold activation circuit.
433643
Houk William R.
Rao Hayagriva V.
Fairchild Semiconductor Corporation
Smart & Biggar
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