256-Kbit (32 K × 8) Serial (I2C) nvSRAM with Real Time Clock
Features
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256-Kbit nonvolatile static random access memory (nvSRAM)
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Internally organized as 32 K × 8
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STORE to QuantumTrap nonvolatile elements initiated automatically on power-down (AutoStore) or by using I2C command (Software STORE) or HSB pin (Hardware STORE)
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RECALL to SRAM initiated on power-up (Power-Up RECALL) or by I2C command (Software RECALL)
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Automatic STORE on power-down with a small capacitor
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High reliability
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Infinite read, write, and RECALL cycles
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1 million STORE cycles to QuantumTrap
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Data retention: 20 years at 85 °C
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For more, see pdf
Overview
The Cypress CY14C256I/CY14B256I/CY14E256I combines a 256-Kbit nvSRAM with a full-featured RTC in a monolithic integrated circuit with serial I2C interface. The memory is organized as 64 K words of 8 bits each. The embedded nonvolatile elements incorporate the QuantumTrap technology, creating the world’s most reliable nonvolatile memory. The SRAM provides infinite read and write cycles, while the QuantumTrap cells provide highly reliable nonvolatile storage of data. Data transfers from SRAM to the nonvolatile elements (STORE operation) takes place automatically at power-down. On power-up, data is restored to the SRAM from the nonvolatile memory (RECALL operation). The STORE and RECALL operations can also be initiated by the user through I2C commands.
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