16 Facts About Static RAM

SStatic RAM is volatile memory; data is lost when power is removed.

Semiconductor bipolar SStatic RAM was invented in 1963 by Robert Norman at Fairchild Semiconductor.

MOS SStatic RAM was invented in 1964 by John Schmidt at Fairchild Semiconductor.

SStatic RAM was the main driver behind any new CMOS-based technology fabrication process since 1959 when CMOS was invented.

SStatic RAM offers a simple data access model and does not require a refresh circuit.

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Since SStatic RAM requires more transistors per bit to implement, it is less dense and more expensive than DStatic RAM and has a higher power consumption during read or write access.

SStatic RAM is used in personal computers, workstations, routers and peripheral equipment: CPU register files, internal CPU caches and external burst mode SStatic RAM caches, hard disk buffers, router buffers, etc.

SStatic RAM was used for the main memory of most early personal computers such as the ZX80, TRS-80 Model 100 and Commodore VIC-20.

Non-volatile SStatic RAM has standard SStatic RAM functionality, but they save the data when the power supply is lost, ensuring preservation of critical information.

Pseudostatic RAM has a DRAM storage core, combined with a self refresh circuit.

Therefore, SStatic RAM memory is mainly used for CPU cache, small on-chip memory, FIFOs or other small buffers.

Typical SStatic RAM cell is made up of six MOSFETs, and is often called a 6T SStatic RAM cell.

Four-transistor SStatic RAM is quite common in stand-alone SStatic RAM devices, implemented in special processes with an extra layer of polysilicon, allowing for very high-resistance pull-up resistors.

An SStatic RAM cell has three different states: standby, reading or writing .

SStatic RAM operating in read and write modes should have "readability" and "write stability", respectively.

Some SStatic RAM cells have a "page mode", where words of a page can be read sequentially with a significantly shorter access time .