Microchip's Stand-Alone Serial SRAM Devices
Microchip has announced a family of 8- and 32-kByte stand-alone serial SRAM devices designed to increase a system’s available RAM through adding small, inexpensive external devices. The 23A640, 23K640 (23 x 640), 23A256 and 23K256 (23 x 256) devices feature a familiar, industry standard SPI interface, providing increased design flexibility while reducing design and production costs.Many
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, as they require fewer MCU I/O resources, even using a smaller MCU. The serial RAM devices require just four I/O pins as opposed to 16 or 24 pins for a parallel RAM. Additionally, the devices feature a bus speed of 20MHz for fast access, and low operating and standby currents to help extend battery life.
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 are all available in 8-pin SOIC, PDIP and TSSOP packages.