DESCRIPTION

The Intersil X24C45 is a serial 256-bit NOVRAM featuring a static RAM configured 16 x 16, overlaid bit-by-bit with a nonvolatile EEPROM array. The X24C45 is fabricated with Intersil’s Advanced CMOS Floating Gate technology.

The Intersil NOVRAM design allows data to be transferred between the two memory arrays by means of software commands or external hardware inputs. A store operation (RAM data to EEPROM) is completed in 5ms or less and a recall operation (EEPROM data to RAM) is completed in 2μs or less.

The X24C45 also includes the AUTOSTORE feature, a user selectable feature that automatically performs a store operation when VCC falls below a preset threshold.

Intersil NOVRAMs are designed for unlimited write operations to RAM, either from the host or recalls from EEPROM and a minimum 1,000,000 store operations. Inherent data retention is specified to be greater than 100 years.

FEATURES

? AUTOSTORE NOVRAM

—Automatically performs a store operation

upon loss of VCC

? Single 5V supply

? Ideal for use with single chip microcomputers

—Minimum I/O interface

—Serial port compatible (COPS?, 8051)

—Easily interfaced to microcontroller ports

? Software and hardware control of nonvolatile

functions

? Auto recall on power-up

? TTL and CMOS compatible

? Low power dissipation

—Active current: 10mA

—Standby current: 50μA

? 8-lead PDIP and 8-lead SOIC packages

? High reliability

—Store cycles: 1,000,000

—data retention: 100 years