Electronic digital logic circuitry – Interface – Current driving
Reexamination Certificate
2007-02-27
2007-02-27
Tran, Anh Q. (Department: 2819)
Electronic digital logic circuitry
Interface
Current driving
C326S017000, C326S018000, C326S086000
Reexamination Certificate
active
11078622
ABSTRACT:
Since voltages of two input terminals of an output unit having an online download function are decided by voltages which are not correlative to each other, a value of an incoming current on the start-up becomes large. The present invention solves the problem of turning-on of a parasitic transistor due to a transitional minus potential even when the voltage of the output unit on a stationary state is set to 0 V in order to reduce the incoming current. In this invention, a switch is turned on and off by a download switching digital signal, and an input from a delay circuit for charging and discharging a condenser in the delay circuit whose one end is connected to a reference potential is input to one of the input terminals of the output terminal while the reference potential is applied to the other input terminal of the output unit. Thus, an input error in the output unit is reduced to prevent an excessive incoming current. Therefore, it is possible to freely select the voltage on the stationary state of the output unit, thereby preventing the unwanted turning-on of the parasitic transistor.
REFERENCES:
patent: 4633491 (1986-12-01), Kuhnel
patent: 6377480 (2002-04-01), Sase et al.
patent: 2002-354714 (2002-12-01), None
Tran Anh Q.
Westerman, Hattori, Daniels & Adrian , LLP.
Yokogawa Electric Corporation
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