DESCRIPTION

The X25021 is a CMOS 2048-bit serial E2PROM, internally organized as 256 x 8. The X25021 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

? SPI Modes (0,1 & 1,0)

? 256 X 8 Bits

—4 Byte Page Mode

? Low Power CMOS

—10μA Standby Current

—3mA Active Current

? 2.7V To 5.5V Power Supply

? Block Lock Protection

—Protect 1/4, 1/2 or all of E2PROM Array

? Built-in Inadvertent Write Protection

—Power-Up/Power-Down protection circuitry

—Write Latch

—Write Protect Pin

? Self-Timed Write Cycle

—5ms Write Cycle Time (Typical)

? High Reliability

—Endurance: 100,000 cycles per byte

—Data Retention: 100 Years

—ESD protection: 2000V on all pins

? 8-Lead PDlP Package

? 8-Lead SOIC Package