Patent ID: 7148742
Filing Date: 2006-12-12
Classification: G11C

Abstract:
1. Power detection circuitry, comprising: voltage reference circuitry coupled to a source voltage and operative to provide to a reference node a reference voltage ranging from a power-off voltage level to a fixed voltage level; logic circuitry coupled to receive said reference voltage and an input voltage derived from said source voltage, said logic circuitry operative to selectively change the state of a POWER-UP ENABLE signal based on said reference voltage and said input voltage; startup circuitry coupled to said reference circuitry and further coupled to receive a FAST STARTUP signal from said logic circuitry, said FAST STARTUP signal selectively causing said startup circuitry to provide current to said reference circuitry that enables said reference circuitry to couple said reference node to said source voltage; and wherein said reference circuitry provides said fixed voltage level to said reference node when said source voltage approaches said fixed voltage level.