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US 6,784,717 B1Granted
Input buffer system using low voltage transistors
AssigneeCypress Semiconductor Corporation
InventorsJeffery Scott Hunt, Scott Anthony Jackson
Life of this patent
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Abstract
An input buffer system has an input clipping circuit. The input clipping circuit has a high voltage input and uses transistors all being the thin oxide type transistors. A high voltage detect circuit is coupled to the input clipping circuit. An input buffer circuit is coupled to the input clipping circuit and has a low voltage output range.
Claims6
An input buffer system, comprising:
- an input clipping circuit receiving a high voltage input providing a clipped voltage output and including only transistors of a low voltage type transistors;
- a high voltage detect circuit coupled to the input clipping circuit for detecting whether an external signal is for detecting whether an external signal is outside a predetermined operating range and providing a high voltage high detect output signal and a high voltage low detect output signal to the input clipping circuit;
- and
- an input buffer circuit receiving the clipped voltage output and providing a low voltage output.
1 more element
Dependencies are inferred from the claim text.