Method and apparatus for providing both power and control by way

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395550, G06F 116, G06F 108

Patent

active

055353983

ABSTRACT:
A method and apparatus for providing both power and control by way of an integrated circuit terminal (22). In one form, a clock source (12) supplies a periodic signal to a phase lock loop circuit (32) and to a multiplexer (34). The output of the phase lock loop circuit (32) is a second input to the multiplexer (34). The phase lock loop circuit (32) receives its power from a power and control pin (22). The multiplexer (34) receives its power from a power pin (24). The power and control pin (22) is used as a control input to multiplexer (34). Multiplexer (34) uses the power and control pin (22) to select which input to output as a system clock.

REFERENCES:
patent: 4893271 (1990-01-01), Davis et al.
patent: 4931748 (1990-06-01), McDermott
patent: 5133064 (1992-07-01), Hotta et al.
patent: 5134703 (1992-07-01), Bumbarger
patent: 5155841 (1992-10-01), Bumbarger
Terry Lawell, "Integrated Pass-Through Logic", Jan. 1982, Motorola Technical Developments vol. 2, p. 15.

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