Integrated circuit with input/output pad having pullup or pulldown
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United States of America Patent
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Mar 19, 1996
Grant Date -
N/A
app pub date -
Sep 30, 1994
filing date -
Sep 30, 1994
priority date (Note) -
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status (Latency Note)
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Abstract
Voltage pullup or pulldown devices of general purpose input/output pads of integrated circuit chips are controlled by signals derived from a core of the chip and which indicate (1) if the pad is to be enabled to output a value and (2) the value of the signal to be outputted. Such devices are controlled to supply different current levels to the input/output terminals as a function of whether the chip is operating in 'sleep' and interrupt modes. The device of each pad is disabled when signals or commands are supplied via the pad from the chip to circuitry external to the chip and vice versa.
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