Method and apparatus for protecting off chip driver circuitry em

Details Method and apparatus for protecting off chip driver circuitry em Method and apparatus for protecting off chip driver circuitry em

1999-02-26

2000-12-26

Tokar, Michael

Electronic digital logic circuitry

Tri-state

With field-effect transistor

326 57, 326 56, 326 58, 326 86, 326119, 326121, 327143, 327198, 327112, 327185, H03K 1900, H03L 700

Patent

active

061665614

ABSTRACT:
OCD circuitry is provided for an integrated circuit having a split rail power supply providing a first and a second voltage. The OCD circuitry comprises a tristate logic circuit adapted to control the OCD and a detection circuit coupled to the tristate logic circuit and adapted to generate an inactivation signal that inactivates the OCD if the first voltage is low. The detection circuit preferably comprises a comparator that compares the first voltage to the second voltage, and that generates the inactivation signal if the first voltage is less than the second voltage. To prevent the inadvertent inactivation of the OCD circuitry, the detection circuit preferably is provided with a filter that sets a minimum time period that the first voltage must be low before the detection circuit generates the inactivation signal and thus inactivates the OCD circuitry.

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