64千位（为8K ×8 ） SPI的nvSRAM与实时时钟 64-Kbit 8 K x 8 SPI nvSRAM with Real Time Clock
Overview
The Cypress CY14X064PA combines a 64 Kbit nvSRAM[1] 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.
64-Kbit 8 K × 8 SPI nvSRAM with Real Time Clock
Features
■64-Kbit nonvolatile static random access memory nvSRAM
❐Internally organized as 8 K × 8
❐STORE to QuantumTrap nonvolatile elements initiated automatically on power-down AutoStore or by using SPI instruction Software STORE or HSBpin Hardware STORE
❐RECALL to SRAM initiated on power-up Power Up RECALL or by SPI instruction Software RECALL
❐Automatic STORE on power-down with a small capacitor
■High reliability
❐Infinite read, write, and RECALL cycles
❐1 million STORE cycles to QuantumTrap
❐Data retention: 20 years at 85oC
■Real time clock RTC
❐Full-featured RTC
❐Watchdog timer
❐Clock alarm with programmable interrupts
❐Backup power fail indication
❐Square wave output with programmable frequency 1 Hz, 512 Hz, 4096 Hz, 32.768 kHz
❐Capacitor or battery backup for RTC
❐Backup current of 0.45 A typical
■40 MHz, and 104 MHz High-speed serial peripheral interface SPI
❐40 MHz clock rate SPI write and read with zero cycle delay
❐104 MHz clock rate SPI write and read with special fast read instructions
❐Supports SPI mode 0 0,0 and mode 3 1,1
■SPI access to special functions
❐Nonvolatile STORE/RECALL
❐8-byte serial number
❐Manufacturer ID and Product ID
❐Sleep mode
■Write protection
❐Hardware protection using Write Protect WP pin
❐Software protection using Write Disable instruction
❐Software block protection for 1/4, 1/2, or entire array
■Low power consumption
❐Average active current of 3 mA at 40 MHz operation
❐Average standby mode current of 250 A
❐Sleep mode current of 8 A
■Industry standard configurations
❐Operating voltages:
• CY14C064PA : VCC= 2.4 V to 2.6 V
• CY14B064PA : VCC= 2.7 V to 3.6 V
• CY14E064PA : VCC= 4.5 V to 5.5 V
❐Industrial temperature
❐16-pin small outline integrated circuit SOIC package
❐Restriction of hazardous substances RoHS compliant