Integrated circuit with input/output pad having pullup or pulldo

Details Integrated circuit with input/output pad having pullup or pulldo Integrated circuit with input/output pad having pullup or pulldo

1994-09-30

1996-03-19

Westin, Edward P.

Electronic digital logic circuitry

Interface

Current driving

326 57, H03K 190944

Patent

active

055006116

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.

REFERENCES:
patent: 4680487 (1987-07-01), Kobayashi
patent: 4697107 (1987-09-01), Haines
patent: 4746818 (1988-05-01), Hafner
patent: 5017813 (1991-05-01), Galbraith et al.
patent: 5331220 (1994-07-01), Pierce et al.
patent: 5345556 (1994-09-01), Zapisek

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