Transition detection at input of integrated circuit device

Details Transition detection at input of integrated circuit device Transition detection at input of integrated circuit device

2007-03-13

2007-03-13

Elamin, A. (Department: 2116)

Electrical computers and digital processing systems: support

Computer power control

Power conservation

C713S321000, C713S322000, C713S323000, C713S324000, C315S080000, C315S084000, C324S415000, C324S416000

Reexamination Certificate

active

10525579

ABSTRACT:
An integrated circuit has an input connection for connecting an external signal conductor that passes signals to execute functions in the device. The external signal conductor can pick up strong interfering signals with high frequency content, for example when the device is used in a car. To protect against unintended execution of functions the device contains a timer circuit comprising a capacitance and a current supplying circuit coupled to an integration node. A discharge diode is coupled between the input connection and the integration node, with a polarity such that the discharge diode, when in forward bias, is capable of draining current from the current supplying circuit. A detector is coupled to the integration node for generating a signal to be supplied to the integrated circuit device to respond to a signal transition on the conductor. The diode serves to reset integration on the integration node before the detector detects the transition in case of short pulses. By using a diode instead of a switching transistor the circuit is more robust against the effect of interfering pulses.

REFERENCES:
patent: 5794055 (1998-08-01), Langer et al.
patent: 6023108 (2000-02-01), Lenhard
patent: 6534990 (2003-03-01), Hocken et al.
patent: 6580219 (2003-06-01), Jones et al.
patent: 6735705 (2004-05-01), Egbert et al.
patent: 7080270 (2006-07-01), Yokozeki et al.

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