static RAM


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static RAM

This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)

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.
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References in periodicals archive ?
The second category of RAM is static RAM. With this kind of memory, the computer can electronically set the chip, and it will remain that way until changed.
He then illustrated Samsung's position as a global leader in the electronics market, holding the top market share position worldwide in LCD TVs (21 per cent), monitors (16 per cent), LCD Panel TVs (27 per cent), flash memory (32 per cent), dynamic RAM (DRAM; 31 per cent), and static RAM (SRAM; 28 per cent).
Pin-compatible with asynchronous static RAM (SRAM), the FM22L16 targets industrial control systems such as robotics, network and data storage applications, multifunction printers and auto navigation systems.
MRAM combines the best features of today's common memory technologies: the storage capacity and low-cost of Dynamic RAM (DRAM), the high speed of Static RAM (SRAM), and the non-volatility of flash memory.
The control system uses dual Motorola processors and has 1 Mb of 20 nanosecond, high-speed static RAM on a 40 MHz bus to provide up to 1000 blocks-per-sec of program execution speed standard.
FRAM chips combine fast operating speeds of static RAM (SRAM) and the design configuration of DRAM chips with the ability to retain data when the power is switched off, like Flash memory chips.
Cypress's products include static RAM and specialty memories, programmable logic devices (PLDs), data communications products, timing devices, and USB microcontrollers.