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Microchip's New Stand-Alone Serial SRAM Devices


New 8k and 32k serial SRAM Devices with SPI interface,



Microchips New Stand-Alone Serial SRAM Devices Microchip has released a family of 8- and 32-Kbyte stand-alone serial SRAM devices, which increase a system's available RAM memory by adding small, inexpensive external devices. The 23A640, 23K640 (23X640), 23A256 and 23K256 (23X256) devices feature a familiar, industry-standard SPI interface and enable increased design flexibility, while reducing design and production costs, and time to market.

Many embedded applications require volatile RAM for temporary data storage, or for use as a scratchpad, for bulk processing and for math algorithms. In many cases, this RAM is embedded within the microcontroller (MCU). In the past, the most viable way to add more RAM was to buy a larger MCU, which could add unnecessary feature overhead and increase design costs. The only alternative was to add large, parallel-access RAM devices that use up large numbers of I/O pins.

Microchip's serial SRAM devices provide a simple, inexpensive way for designers to add more RAM to their application while keeping the same MCU, or even using a smaller one if replacing parallel external RAM with serial RAM. Additionally, the devices feature a bus speed of 20 MHz for fast access, and low operating and standby currents to help extend battery life. They are available in 8-pin packages but only use four MCU pins, compared with 16 to 24 pins for parallel RAM.

“Microchip is pleased to offer a high-performance, low-cost option for designers wanting to easily and inexpensively add more memory to their applications,” said Randy Drwinga, vice president of Microchip's Memory Products Division. “These devices show our commitment to finding new, creative solutions that help our customers save time and money, while enabling them to enjoy high performance, including the immediate writes, infinite endurance and low power draw that these serial SRAM devices provide.”

The 23A640 and 23A256 devices have an operating voltage range of 1.7 - 1.95V. The 23K640 and 23K256 devices have an operating voltage range of 2.7 - 3.6V. All of the devices are well suited for applications involving bulk data transfers; DSP and other math algorithms (e.g. FFT and DFT); audio/video, speech encoding, VoIP and Internet applications. Specific examples include applications in the consumer (Internet appliances, Internet radios and printers); industrial (utility meters, vending machines); and medical markets (portable patient-monitoring devices), among others.

The company's Web site address is http://www.microchip.com/.
[Reprinted with kind permission from Microchip Corporation]


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