Patent ID: 7346784
Filing Date: 2008-03-18
Classification: G01R,G11C,H03K,H05K

Abstract:
1. On a printed circuit board having a logic circuit, a memory circuit, and a printed circuit board power supply input connected to both the logic and memory circuits, the printed circuit board comprising: a program power supply input coupled to the memory circuit; means for electrically isolating the logic circuit from the memory circuit; and means for electrically isolating the program power supply input from the logic circuit, wherein the means for electrically isolating the program power supply input from the logic circuit comprises means selected from a group consisting of: at least one normally open switch that closes in response to the presence of power on the printed circuit board power supply input; a diode means connected between the program power supply input and the printed circuit board power supply input; and a switch circuit powered in response to an absence of power on the printed circuit board power supply input.