Fail safe I/O driver with pad feedback slew rate control

Details Fail safe I/O driver with pad feedback slew rate control Fail safe I/O driver with pad feedback slew rate control

2011-08-23

2011-08-23

Le, Don P (Department: 2819)

Electronic digital logic circuitry

Interface

Current driving

C326S027000

Reexamination Certificate

active

08004312

ABSTRACT:
Disclosed are a method, system and apparatus for an improved fail safe I/O driver with pad feedback slew rate control are disclosed. In one embodiment, a pad driver circuit includes a pad node, an NMOS component, a feedback capacitor between the pad node and a gate of the NMOS component to control slew rate across a range of capacitor loads, a switch circuit between the pad node and the feedback capacitor, and a signal generator to generate a signal to control the switch circuit. The switch circuit to maintain a main driver circuit and a pre-driver circuit of the pad driver circuit in a fail safe state when an integrated circuit that includes the pad driver circuit is in the fail safe state. The pad driver circuit may include a PMOS component.

REFERENCES:
patent: 5646550 (1997-07-01), Campbell et al.
patent: 5880602 (1999-03-01), Kaminaga et al.
patent: 6859074 (2005-02-01), Ajit

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