Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Particular stable state circuit
Patent
1998-08-26
2000-07-04
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Particular stable state circuit
327143, 327112, 365226, H03K 1722
Patent
active
06084454&
ABSTRACT:
Some logic circuits preferentially reside in a particular state. Advantages are gained by a circuit that forces the circuit to the preferential state but allows the preferred state to be overridden. A node in the logic circuit is driven to a particular state, in one embodiment, by a pull-up transistor connected to a pull-down transistor that respectively drive the node to a high state and a low state. A keeper circuit is connected to the node and drives the node to the preferred state unless overpowered by the pull-up transistor and the pull-down transistor. The keeper circuit drives the node using a transistor that is weaker than the pull-up transistor and weaker than the pull-down transistor. A startup-circuit is connected to the node and drives the node to the preferred state when the node powers-up in the nonpreferred state. The start-up circuit drives the node using a transistor that is weaker than the keeper circuit transistor.
REFERENCES:
patent: 5402081 (1995-03-01), Wong et al.
patent: 5467037 (1995-11-01), Kumar et al.
patent: 5619165 (1997-04-01), Fournel et al.
patent: 5682105 (1997-10-01), Fujima
patent: 5864247 (1999-01-01), Hirano et al.
patent: 5903500 (1999-05-01), Tsang et al.
Advanced Micro Devices , Inc.
Callahan Timothy P.
Englund Terry L.
Koestner Ken J.
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