초록 ▼

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 mon

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.

대표청구항 ▼

[ What is claimed is:] [1.] A ring oscillator circuit comprising:a first inverting circuit and a plurality of succeeding inverting circuits coupled together in a ring, each inverting circuit having an input and an output, an input of each succeeding inverting circuit being coupled to an output of a

[ What is claimed is:] [1.] A ring oscillator circuit comprising:a first inverting circuit and a plurality of succeeding inverting circuits coupled together in a ring, each inverting circuit having an input and an output, an input of each succeeding inverting circuit being coupled to an output of a preceding inverting circuit in the ring; anda control circuit coupled between the output of each of the inverting circuits and the input of the first inverting circuit, the control circuit having elements to couple an output of a selected one of the inverting circuits to the input of the first inverting circuit to complete the ring and to generate an oscillating signal at the input of the first inverting circuit.