Date: 9 Jul 2013

Random Access Memory (RAM) is a volatile storage device for storing programs and data temporarily. The content of RAM will vanish once the power is turned off. RAM is mainly available in two forms: static and dynamic.

Static RAM

Static RAMs are using flip-flop like cells which can store data as long as the power supply remains on. Both reading and writing are possible at high speed. As RAMs are formed by much more complex cells than ROMs, they occupy more chip area.

Dynamic RAM

Dynamic RAMs are built using capacitor like structure for data storage. This simple cell structure is responsible for higher packaging density and lower cost per bit than its static counterpart. However information stored in dynamic RAMs get lost unless periodically refreshed by rewriting the information.

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