Power on reset circuit.

摘要

A power on reset circuit (10) uses a first inverter (16-26) with hysteresis operating in response to a first power supply potential (12) to develop a first reset signal when the first power supply potential is greater than a first predetermined threshold. A second inverter (46-56) with hysteresis also operates in response to the first power supply potential for developing a second reset signal when the first power supply potential is greater than a second predetermined threshold. The first reset signal disables the second inverter until the first power supply potential reaches the first predetermined threshold. A delay circuit (70-100) delays the second reset signal to ensure the first power supply potential is fully operational before indicating a ready condition. <IMAGE>