Electronic digital logic circuitry – Multifunctional or programmable – Array
Patent
1999-02-12
2000-10-03
Tokar, Michael
Electronic digital logic circuitry
Multifunctional or programmable
Array
326 81, 326 63, H03K 190175
Patent
active
061262587
ABSTRACT:
In general, the present invention is a system and method for interfacing signals with processing elements, such as microprocessors. The present invention utilizes a processing element, an electrical connection, a resistive device, a current sink, a first diode, a second diode, and a buffer. The electrical connection is coupled to the processing element, which is associated with an operating voltage. The resistive device is coupled to the electrical connection, and the first diode is coupled to the electrical connection and the current sink. An anode end of the first diode is coupled to the electrical connection between the resistive device and the processing element, and a cathode end of the first diode is coupled to the current sink. The buffer is coupled to the processing element, which transmits a voltage corresponding with the operating voltage of the processing element to the buffer. The second diode couples the buffer to the current sink. The voltage of the signal transmitted to the buffer is reduced by the second diode such that the voltage at the cathode end of the first diode corresponds to the operating voltage of the processing element minus the voltage drop across the first diode. As a result, the voltage of the signals transmitted across the electrical connection are prevented from exceeding the operating voltage of the processing element.
REFERENCES:
patent: 4527079 (1985-07-01), Thompson
patent: 5013941 (1991-05-01), Jansson
patent: 5534801 (1996-07-01), Wu et al.
patent: 5910734 (1999-06-01), Manning
patent: 5952848 (1999-09-01), Morris
Agilent Technologies
Le Don Phu
Tokar Michael
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