The Microchip Technology Inc 47L04 EERAM is a 4Kbit SRAM with EEPROM Backup. The I2C
EERAM Memory is a Low-Cost NVSRAM that Eliminates the Need for an External
Battery to Retain Data. The device is organized as 512 x 8 bits and utilizes the I2C serial interface. The 47L04 provides infinite read and write cycles to the SRAM while the EEPROM cells provide high endurance non-volatile storage of Data. With an external capacitor, SRAM data is automatically transferred to the EEPROM upon power-loss. Data can also be transferred manually by using either the hardware store pin or by software control. Upon power-up, the EEPROM data is automatically recalled to the SRAM. Recall can also be initiated through software control. The unlimited endurance makes the EERAM useful in applications that need to constantly monitor or record data.
The 47L04 EERAM has a 2.7-3.6V operating voltage range and is available in 8-lead SOIC, TSSOP and PDIP packages. The EERAM works from -40C to 125C and is automotive grade qualified.
4Kbit SRAM with EEPROM Back Up
Automatic Store to EEPROM 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 40ms (max)
2.7V -3.6V Operation
High-Speed I2C Interface (Up to 1MHz)
Non-Volatile External Event Detect Flag
Infinite Read and Write Cycles to SRAM Array
More than 1 Million Store Cycles to EEPROM
Data Retention: >200 Years
ESD Protection: >2,000V
Reliable Data Storage during Power Loss
Low Power CMOS Technology:
1mA active current (typ)
40uA Standby Current (max)
Software Write Protection from 1/64 of SRAM array to whole array
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The EERAM I²C PICtail™ Kit demonstrates the features and abilities of the 47C04 and 47L16 I²C EERAM devices in standard development platforms. By designing this daughter board with the PICtail Plus and mikroBUS™ connectors, it will operate with the Explorer 8 Development Board, the Explorer 16/32 Development Board, and many other tools. Package contents includes an Info Sheet...