SPI Serial SRAM and NVSRAM Devices

Microchip's SRAM and NVSRAM families provide a way to easily add external RAM

Microchip Technology's SPI Serial SRAM and NVSRAM DevicesMicrochip's serial SRAM family provides a way to easily and inexpensively add external RAM to almost any application. These 8-pin serial devices use less power and fewer I/O connections than traditional parallel SRAM. They also allow designers to use a smaller microcontroller rather than moving to a larger device just to get more on-board RAM. Zero write-cycle times make these devices ideal for offloading graphics, data buffering, data logging, displays, math, audio, video, and other data-intensive functions to a standalone SRAM. SDI and SQI allow for 2x and 4x data rates compared with standard SPI. SPI-compatible serial SRAM devices from Microchip are available in 64, 256, 512, and 1024 Kbit options. These devices provide high-speed performance at low power making them ideal for embedded applications needing more RAM.

Additionally, the 512 Kb and 1 Mb devices also feature a Vbat pin for battery backup, making them non-volatile when an external battery or supercap is connected to this pin. These serial NVSRAM devices offer unlimited endurance and instantaneous writes and are beneficial for applications such as meters, black boxes, and data recorders.

  • Low-power CMOS technology: 4 μA max standby current
  • Standard 4-pin SPI interface: chip select, data in, data out, and clock
  • Unlimited writes to memory, zero write times
  • Battery backup available (512 Kb, 1 Mb)
  • 32-byte page
  • High-speed SDI (2x) and SQI (4x) modes supported, up to 80 Mb/sec
  • Industrial temperatures range: -40°C to +85°C
  • Small, 8-lead SOIC, TSSOP, and PDIP packages

SPI Serial SRAM and NVSRAM Devices

ImageManufacturer Part NumberDescriptionAvailable Quantity
23K256-I/SN datasheet linkIC SRAM 256KBIT 20MHZ 8SOIC23K256-I/SNIC SRAM 256KBIT 20MHZ 8SOIC6465 - Immediate
23K256-I/SN product page link
23K256-I/ST datasheet linkIC SRAM 256KBIT 20MHZ 8TSSOP23K256-I/STIC SRAM 256KBIT 20MHZ 8TSSOP5412 - Immediate
23K256-I/ST product page link
23K640-I/SN datasheet linkIC SRAM 64KBIT 20MHZ 8SOIC23K640-I/SNIC SRAM 64KBIT 20MHZ 8SOIC2677 - Immediate
23K640-I/SN product page link
23K640-I/ST datasheet linkIC SRAM 64KBIT 20MHZ 8TSSOP23K640-I/STIC SRAM 64KBIT 20MHZ 8TSSOP2289 - Immediate
23K640-I/ST product page link
23A512-I/ST datasheet linkIC SRAM 512KBIT 20MHZ 8TSSOP23A512-I/STIC SRAM 512KBIT 20MHZ 8TSSOP597 - Immediate
23A512-I/ST product page link
23LC512-I/P datasheet linkIC SRAM 512KBIT 20MHZ 8DIP23LC512-I/PIC SRAM 512KBIT 20MHZ 8DIP206 - Immediate
23LC512-I/P product page link
23K256-I/P datasheet linkIC SRAM 256KBIT 20MHZ 8DIP23K256-I/PIC SRAM 256KBIT 20MHZ 8DIP407 - Immediate
23K256-I/P product page link
23A512-I/SN datasheet linkIC SRAM 512KBIT 20MHZ 8SOIC23A512-I/SNIC SRAM 512KBIT 20MHZ 8SOIC46 - Immediate
23A512-I/SN product page link
23A256-I/SN datasheet linkIC SRAM 256KBIT 20MHZ 8SOIC23A256-I/SNIC SRAM 256KBIT 20MHZ 8SOIC368 - Immediate
23A256-I/SN product page link
23A256-I/ST datasheet linkIC SRAM 256KBIT 20MHZ 8TSSOP23A256-I/STIC SRAM 256KBIT 20MHZ 8TSSOP275 - Immediate
23A256-I/ST product page link
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Published: 2013-01-10