The Microchip Technology Inc. 47L04/47C04/47L16/47C16 (47XXX) is a 4/16 Kbit SRAM with EEPROM backup. The device is organized as 512 x 8 bits or 2,048 x 8 bits of memory, and utilizes the I2C serial interface. The 47XXX provides infinite read and write cycles to the SRAM while EEPROM cells provide high-endurance nonvolatile storage of data. With an external capacitor, SRAM  data is automatically transferred to the EEPROM upon loss of power. Data can also be transferred manually by using either the Hardware Store pin or software control. Upon power-up, the EEPROM data is  automatically recalled to the SRAM. Recall can also be initiated through software control.  The 47XXX is available in the 8-lead PDIP, SOIC, and TSSOP packages. 

Features:

• 4 Kbit/16 Kbit SRAM with EEPROM Backup:
  • Internally organized as 512 x 8 bits (47X04) or 2,048 x 8 bits (47X16)
  • Automatic Store to EEPROM array upon power-down (using optional external capacitor)
  • Automatic Recall to SRAM array upon power-up
  • Hardware Store pin for manual Store operations
  • Software commands for initiating Store and Recall operations
  • Store time 8 ms maximum (47X04) or 25 ms maximum (47X16)
• Nonvolatile External Event Detect Flag
• High Reliability:
  • Infinite read and write cycles to SRAM
  • More than one million store cycles to EEPROM
  • Data retention: >200 years
  • ESD protection: >4,000V
• High-Speed I2C Interface:
  • Industry standard 100 kHz, 400 kHz and 1 MHz
  • Zero cycle delay reads and writes
  • Schmitt Trigger inputs for noise suppression
  • Cascadable up to four devices
• Write Protection:
  • Software write protection from 1/64 of SRAM array to whole array
• Low-Power CMOS Technology:
  • 200 µA active current typical
  • 40 µA standby current (maximum)
• 8-Lead PDIP, SOIC, and TSSOP Packages
• Available Temperature Ranges:
  • Industrial (I): -40°C to +85°C
  • Automotive (E): -40°C to +125°C