PURPOSE: To enable to use a volatile memory as a nonvolatile one by a method wherein two terminals, one is an ordinary power source terminal and the other is a power source terminal having a switch which is turned ON or OFF by the potential of the main power source, are provided on the volatile memory.
CONSTITUTION: The main power source 3, the volatile memory 1 and a power source unit 2 are connected respectively. Said memory 1 has two power source terminals, one is an ordinary power source terminal 6 and the other is a power source terminals 7 having a switch SW1 which is turned ON or OFF by potential of the main power source 3. Said switch SW1 is MOSFET, and a substrate is grounded by connecting a drain and a gate. Also, said power source unit 2 consists of a battery 9 which functions as a power source, and an MOSFET consists of a switch SW2 which is turned ON or OFF by the potential of the main power source 3. Its gate is connected to the terminal 7 for which the main power source 3 will be directly supplied, a drain is connected to the power source terminal 6 of the volatile memory, and a GND is connected to a GND terminal.
WATARI SHIGERU
SUGANO MASAHIDE
YAMAGUCHI SEIJI
KOTANI HISAKAZU
TANIGUCHI TAKASHI
| JP57186143B | ||||
| JP55178900B | ||||
| JP56164322B | ||||
| JPS5757324A | 1982-04-06 | |||
| JPS5642365A | 1981-04-20 |