DESCRIPTION

The Xicor X25401 is a serial 256 bit NOVRAM featuring a static RAM configured 16 x 16, overlaid bit-by-bit with a nonvolatile E2PROM array. The X25401 features a Serial Peripheral Interface (SPI) and software protocol allowing operation on a simple three-wire bus. The bus signals are a clock input (SCK) plus separate data in (SI) and data out (SO) lines. Access to the device is controlled through a chip select (CS) input, allowing any number of devices to share the same bus.

FEATURES

? 1MHz Clock Rate

? AUTOSTORE? NOVRAM

—Automatically Performs a Store Operation Upon Loss of VCC

? Single 5 Volt Supply

? Ideal for use with Single Chip Microcomputers

—Minimum I/O Interface

—SPI Mode (0,0 & 1,1) Serial Port Compatible

—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