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Microchip Technology Inc.announced 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.
Microchip provides the 23A640 and 23K640 (23x640 serie) SPI serial SRAM (64kbit, or 8kB x 8) and 23A256 or 23K256 (23x256 serie) SRAM with 256kbit (32K x 8).
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.
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’s serial SRAM devices are all available in 8-pin SOIC, PDIP and TSSOP packages.