| 摘要 |
SOLID STATE SWITCH WITH LAST STATE MEMORY A solid state switch is provided which has the capability of retaining its last state memory in the event of a power failure or interruption. The solid state switch includes an output driver formed of at least one N-channel MOS field-effect transistor, a holding capacitor, a charging resistor, a transistor-connected diode interconnected between a power supply voltage source and the charging resistor for preventing leakage of the holding capacitor. The field-effect transistor has its drain connected to a first output terminal and it source connected to a second output terminal. One end of the holding capacitor is connected to the gate of the field-effect transistor and its other end is connected to a ground potential. The holding capacitor retains the last state between the first and second output terminals in the event of a loss of the power supply voltage source.
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