static RAM


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Related to static RAM: dynamic RAM

static RAM

static RAM

A fast memory technology that requires power to hold its content. Static RAM (SRAM, S-RAM) is used for high-speed registers, caches and relatively small memory banks such as a frame buffer on a graphics card. In contrast, the main memory in a computer is typically dynamic RAM (DRAM). Static RAM chips have access times in the 10 to 30-nanosecond range, while dynamic RAM is usually above 50 ns.

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Static RAM is fast because the six-transistor configuration of its pretzel-like flip-flop circuits keeps current flowing in one direction or the other (0 or 1). The 0 or 1 state can be written and read instantly without waiting for a capacitor to fill up or drain; however, the six transistors take more space than dynamic RAM cells made of one transistor and one capacitor (see dynamic RAM).

Earlier asynchronous static RAM chips performed read and write operations sequentially. Newer synchronous static RAM chips overlap reads and writes.


A Static RAM Cell
When opposite voltages are applied to the column wires, the flip-flop is oriented in one of two directions for a 0 or 1. At that point, the flip-flop (yellow center) becomes a self-perpetuating storage cell as long as a constant voltage is applied.
References in periodicals archive ?
A static RAM bit is made up of a flip-flop circuit that lets current flow through one side or the other based on which one of two transistors is activated.
Fujitsu's new MB84VN23381EJ and MB84VN23391EJ MCP devices provide 64Mbit NAND-type Flash memory and 16Mbit FCRAM with a static RAM interface.
The new flash and FCRAM-stacked MCPs utilize the company's "FlexBank" architecture, including 64 Mbit dual-operation flash memory and 16 Mbit FCRAM with an asynchronous Static RAM (SRAM) interface.