Memory integrated circuit for storing digital and analog data an

Details Memory integrated circuit for storing digital and analog data an Memory integrated circuit for storing digital and analog data an

1998-12-22

2000-03-28

Phan, Trong

Static information storage and retrieval

Analog storage systems

36518503, 365222, G11C 2700, G11C 1606, G11C 700

Patent

active

06044004&

ABSTRACT:
A memory device includes an array of floating gate FET memory cells capable of storing either analog or digital data. The memory device includes first read-write circuitry for storage and retrieval of digital data, and second read-write circuitry for storage and retrieval of analog data. As a result, the digital data storage capability facilitates real-time operation of devices using the memory device without sacrificing the memory capacity capabilities of analog data storage. When a host device using the memory device is not in use, the stored digital data may be read out from the memory device, converted to analog form and then stored in the memory device, re-capturing the data density capabilities of analog data storage in floating gate FET memory cells. Analog data latency comparable to digital data latency is achieved by reading the analog data out from the memory cells, refreshing the analog data and then re-storing digital or analog data corresponding to the refreshed analog data in the memory cells in response to predetermined criteria.

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