FUJITSU SEMICONDUCTOR
DATA SHEET
DS05-13105-1E
Memory FRAM
CMOS
256 K (32 K × 8) Bit SPI
MB85RS256
■ DESCRIPTION
MB85RS256 is a FRAM (Ferroelectric Random Access Memory) chip in a configuration of 32,768 words × 8 bits,
using the ferroelectric process and silicon gate CMOS process technologies for forming the nonvolatile memory
cells.
MB85RS256 adopts the Serial Peripheral Interface (SPI).
Unlike SRAM, MB85RS256 is able to retain data without back-up battery.
The memory cells used for the MB85RS256 has improved at least 1010 times of read/write operation significantly
outperforming FLASH memory and EEPROM in the number.
MB85RS256 does not take long time to write data unlike FLASH memories nor EEPROM, and MB85RS256 takes
no wait time.
■ FEATURES
• Bit configuration
• Operating power supply voltage
• Operating frequency
: 32,768 × 8 bits
: 3.0 V to 3.6 V
: 15 MHz (Max)
(Continued)
■ PACKAGE
8-pin plastic SOP
(FPT-8P-M02)
