Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1993-05-06
1994-08-23
Callahan, Timothy P.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307465, H01H 3776
Patent
active
053410300
ABSTRACT:
A method for isolating a first low-voltage circuit node comprising an output of a low-voltage device from a second circuit node which carries high programming voltages during programming of user-programmable interconnect elements includes the step of raising the normal power supply voltage provided to the low-voltage devices to an intermediate level lower than the programming voltage but high enough to protect the outputs of the low voltage devices from damage. The output to be protected is caused to assume a desired state and is then inhibited from changing state during the programming cycle. Programming voltage is then applied to the low voltage circuit node.
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IBM Technical Disclosure Bulletin, "5-Volt Signal Level Shifter In A 3-Volt CMOS Circuit", Dec. 1989, vol. 32, No. 7.
Actel Corporation
Callahan Timothy P.
Cunningham Terry D.
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