1

®

FN8104.0

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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Copyright Intersil Americas Inc. 2005. All Rights Reserved

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X24C45

256 Bit, 16 x 16 Bit

Serial AUTOSTORE™ NOVRAM

FEATURES

• AUTOSTORE NOVRAM

—Automatically performs a store operation

• Single 5V supply

• Ideal for use with single chip microcomputers

—Minimum I/O interface

—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

DESCRIPTION

The Intersil X24C45 is a serial 256-bit NOVRAM featur-

ing a static RAM configured 16 x 16, overlaid bit-by-bit

with a nonvolatile EEPROM array. The X24C45 is fabri-

cated with Intersil’s Advanced CMOS Floating Gate

technology.

The Intersil NOVRAM design allows data to be trans-

ferred 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

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.

IBLOCK DIAGRAM

Nonvolatile

Control

Logic

Column

Decode

Row

Decode

4-Bit

Counter

Decode

Instruction

Register

CE (1)

DI (3)

SK (2)

DO (4)

RECALL (6)

AS (7)

Static

RAM

256-Bit

EEPROM

Instruction

Data Sheet

June 1, 2005