Clock signal from an adjustable oscillator for an integrated circuit

摘要

An integrated circuit is described which has circuitry to detect environmental conditions such as temperature and supply voltage and adjust the operation of the circuit accordingly. A flash memory system is described which includes a temperature detector and a supply voltage detector. The memory monitors temperature and voltage and adjusts an oscillator circuit to maintain an ideal operating frequency. The oscillator includes adjustable delay stages which can be selectively fed back to adjust operating frequency. To save power, unused delay stages of the oscillator can be disabled. Oscillator calibration circuitry, a temperature detector, and a voltage detector are described.