Functional Description
The Cypress CY14B256L is a fast static RAM with a nonvolatile element in each memory cell. The embedded nonvolatile elements incorporate QuantumTrap technology producing the world’s most reliable nonvolatile memory. The SRAM provides infinite read and write cycles while independent, nonvolatile data resides in the highly reliable QuantumTrap cell. Data transfers from the SRAM to the nonvolatile elements (the STORE operation) takes place automatically at power down. On power up, data is restored to the SRAM (the RECALL operation) from the nonvolatile memory. The STORE and RECALL operations are also available under software control.

FEATUREs
• 25 ns, 35 ns, and 45 ns access times
• “Hands-off” automatic STORE on power down with only a small capacitor
• STORE to QuantumTrap™ nonvolatile elements is initiated by software, device pin, or AutoStore™ on power down
• RECALL to SRAM initiated by software or power up
• Infinite READ, WRITE, and RECALL cycles
• 10 mA typical ICC at 200 ns cycle time
• 200,000 STORE cycles to QuantumTrap
• 20-year data retention @ 55°C
• Single 3V operation with tolerance of +15%, –10%
• Commercial and industrial temperature
• SOIC and SSOP packages
• RoHS compliance