64-Kbit (8 K × 8) SPI nvSRAM with Real Time Clock
Features
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64-Kbit nonvolatile static random access memory (nvSRAM)
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Internally organized as 8 K × 8
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STORE to QuantumTrap nonvolatile elements initiated automatically on power-down (AutoStore) or by using SPI instruction (Software STORE) or HSB pin (Hardware STORE)
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RECALL to SRAM initiated on power-up (Power Up RECALL) or by SPI instruction (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 CY14X064PA combines a 64 Kbit nvSRAM with a full-featured RTC in a monolithic integrated circuit with serial SPI interface. The memory is organized as 8 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). You can also initiate the STORE and RECALL operations through SPI instruction.
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