Electrical transmission or interconnection systems – Plural supply circuits or sources – One source floats across or compensates for other source
Reexamination Certificate
2007-05-29
2007-05-29
Sircus, Brian (Department: 2836)
Electrical transmission or interconnection systems
Plural supply circuits or sources
One source floats across or compensates for other source
C327S333000
Reexamination Certificate
active
10720387
ABSTRACT:
When an AC adaptor is removed and a power supply to a power node NP of a ROM writing apparatus is stopped, an analog switch which is controlled by a voltage at the power node NP is turned off. Thus, even if a power voltage VTG of a user board side is applied, a data signal DAT which is outputted from the user board is shut off by the analog switch and does not reach the power node NP via a diode. Therefore, a control terminal of a 3-state buffer is certainly set to “L”. There is not a risk such that a pass current flows in the 3-state buffer and a breakdown by heat is caused. When a power source is shut off, a breakdown of an interface circuit due to a wraparound of a power voltage from another apparatus is prevented.
REFERENCES:
patent: 4608504 (1986-08-01), Yamamoto
patent: 5016223 (1991-05-01), Kimura et al.
patent: 06042575 (1995-09-01), None
Amaya Carlos
Oki Electric Industry Co. Ltd.
Sircus Brian
Volentine & Whitt P.L.L.C.
LandOfFree
Interface circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Interface circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Interface circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3771324