Overvoltage protection circuit for integrated CMOS circuit has potential divider unit, signal generator unit, switch unit mounted on same semiconducting substrate as integrated circuit to be protected

摘要

The circuit has external and internal supply voltage connections (11,13), an external earth connection (12), a potential divider unit (2) with a Zener diode (23) and first resistance element (21) series circuit, a signal generator unit (3), an inverter circuit (31,32) and a switch unit (4). The potential divider unit, signal generator unit and switch unit are mounted on the same semiconducting substrate as the protected integrated circuit (5).