Serial SRAM Memory Serial SRAM Memory Family www.microchip.com/SRAM Serial SRAM Memory Do you need more RAM in your application? Does it need to be small, cheap, fast and low power? Are you completing a design and need just a little more volatile memory? Do you need a simple, inexpensive way to add RAM without increasing the size of your microcontroller or ASIC? Microchip’s new serial SRAM family provides a way to easily and inexpensively add external RAM to almost any application. These serial devices use less power and fewer I/O connections than traditional parallel SRAM. And, they allow designers to use a smaller microcontroller rather than moving to a larger microcontroller just to get more on-board RAM. Flexible RAM Expansion Increased Performance Quickly and easily add external SRAM Get high-speed SRAM ■ 8 and 32 Kbyte options ■ Great for scratchpad, buffering and math-intensive applications ■ Add functionality to your current design ■ ■ ■ ■ ■ Cost Effectiveness 20 MHz clock speed Unlimited writes to the array (with no wear out) Low standby and operating currents Fast writes with zero latency Write entire 32 Kbyte chip in 13 ms with one command Add features to your current microcontroller and get to market faster Flexibility: RAM where you need it ■ ■ ■ ■ Microchip’s 8-, 16- and 32-bit microcontrollers and DSPs have many on-board RAM options. Familiar 4-pin SPI interface Serial bus requires only 4 microcontroller I/O pins No need to buy a large microcontroller just for the RAM Cost-reduce your current design RAM MCU The Serial Advantage Typical Parallel SRAM Microchip Serial SRAM I/O Connection 16-20 4 ISTANDBY 3 mA 1 μA IACTIVE 50 mA 1 - 10 mA Lowest Operating Voltage 3.0V 1.7V Footprint 100 mm2 20 mm2 Packages 28-TSSOP, 28-SOIC 8-TSSOP, 8-SOIC And now... Introducing stand-alone serial SRAM offering greater design flexibility and the opportunity for RAM expansion. RAM Packages shown approximate size. www.microchip.com/SRAM MCU SRAM NEW Serial SRAM Memory Serial SRAM Product Family Device Density Operating Voltage Maximum Speed (MHz) Temperature Range Packages (all 8 leads) 23A640 8 KB (64 Kb) 1.7-1.95V 16 -40 to +85ºC SOIC, PDIP, TSSOP 23K640 8 KB (64 Kb) 2.7-3.6V 20 -40 to +85ºC SOIC, PDIP, TSSOP 23A256 32 KB (256 Kb) 1.7-1.95V 16 -40 to +85ºC SOIC, PDIP, TSSOP 23K256 32 KB (256 Kb) 2.7-3.6V 20 -40 to +85ºC SOIC, PDIP, TSSOP Two density options: 8 and 32 Kbyte (64 and 256 Kbit) devices High-speed SPI bus with 20 MHz maximum speed Standard 4-pin SPI interface (Chip select, data in, data out, clock) 8-bit status register controls operational modes: byte, page or full chip mode Wide range of operating conditions: -40 to +85ºC options; 1.8 and 3V Small, 8-lead SOIC, TSSOP and PDIP packages Low power operation: 1 uA typical standby current; (500 nA for 1.8V version) Get started today... Actual Size 8-TSSOP 8-SOIC Additional resources at www.microchip.com/SRAM X Data sheets and application notes (with code) X Verilog, IBIS models X Usage recommendation application note X ”Getting Started with Serial SRAM” web seminar X Best practices web seminar X Samples and on-line purchase options www.microchip.com/SRAM Support Training Microchip is committed to supporting its customers in developing products faster and more efficiently. We maintain a worldwide network of field applications engineers and technical support ready to provide product and system assistance. 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