关键词: 上电复位, 起拉电压, RC延时, 电平检测

Abstract: In order to solve the problem of low pull up voltage due to slow start in traditional power-on reset circuit, a power-on reset circuit supporting a wide range of power on time is proposed. It’s composed of two different modules based on RC delay and voltage detection. The former provides VDD of pull up voltage at fast power on, the latter provides 0.833VDD of pull up voltage at slow power on.The proposed circuit is fabricated in TSMC 0.18 μm Flash process. Three temperature test results show that the pull up voltage is 3.3 V and 2.75 V when the power on time is respectively at the level of μs and ms when VDD is 3.3 V.

Key words: power on reset, pull up voltage, RC delay, voltage detection