AS7C256A-12TIN

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The AS7C256A-12TIN is a family of 256-kilobit serial CMOS Static Random Access Memories (SRAMs) available in space-saving 8-pin PDIP (Plastic Dual In-Line Package) and 8-pad ULQFN (Ultra Low Profile Quad Flat Non-leaded Package). The devices are ideal for numerous applications, ranging from notebook and hand-held computer displays to many types of portable equipment. The device achieved a small chip size and a high density that is superior to conventional SRAM circuit designs. This paper will discuss the application field and working principle of the AS7C256A-12TIN.

Application Field

The AS7C256A-12TIN has a wide range of applications in the consumer electronics and industrial markets. These include computing, communications, graphics, imaging and instrumentation, as well as data storage and retrieval applications such as USB flash drives, memory cards, and hard drives. This type of device is also commonly used in automotive systems, drones, IoT applications and home security systems, among other commercial and industrial applications. It is also used in many PC peripheral types of applications, such as game consoles, keyboards, and mice.

The device can also be used in industrial applications such as SCADA systems and process control systems. Additionally, its low power consumption makes it ideal for embedded systems, such as medical devices, personal digital assistants (PDAs), wireless sensors, and controlling system. In short, due to its superior density and low power consumption, the AS7C256A-12TIN is suitable for a wide range of applications.

Working Principle

The AS7C256A-12TIN operates in the following three steps: access control, storage control and refresh control.

In the access control step, the address and write/read signals are input from the external address bus, along with the chip enable and output enable signals. When the chip enable signal is asserted, the internal address register is latched and the read/write signal is decoded. Then, either a memory read or write operation is performed, depending on the type of access. When the output enable signal is asserted, the read data is output from the IO bus.

The storage control step operates once the type of access is determined. When a memory write operation is performed, the addressed memory cells are selected and the data is written into the addressed cells. On the other hand, when a memory read operation is performed, the addressed memory cells are selected and the data is read and output through the IO bus.

The refresh control step is important for continuous and reliable operation. Every row of memory cells is refreshed by an internal refresh counter, which counts and addresses the rows to be refreshed. This ensures that leakage current does not cause a decrease in the data retention or cause data to be corrupted.

In summary, the AS7C256A-12TIN is a small-chip-size, high-density SRAM device which is suitable for a wide range of applications due to its low power consumption and superior density. The device operates through access control, storage control and refresh control, and is ideal for numerous end-user applications from computing to communications, graphics to imaging, and data storage to process control.

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