Semiconductor storage system with supply voltage junction receiving supply voltage - has boosting system for producing boost signal on boost line with level higher than supply voltage and terminal system has levels for setting voltage on boost line

摘要

A terminal level control system (130,190) is provided for adjusting a terminal level of the terminal system. A voltage lowering system (130) is provided for lowering an external supply voltage for producing the supply voltage. The terminal level control system (130,190) has first and second reference voltage prodn. circuits with MOS transistors and a difference amplification circuit. It determines whether the external supply voltage at least lies on a predetermined potential level or not. ADVANTAGE - Boosting circuit does not adversely affect components. Reliability is also not affected when system is in overvoltage mode for "burn-in tests".