DESCRIPTION
The X25057 is a CMOS 4K-bit serial E2PROM, internally organized as 512 x 8. The X25057 features a Serial Peripheral Interface (SPI) and software protocol allowing operation on a simple four-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
• 5MHz Clock Rate
• IDLock™ Memory
    —IDLock First or Last Page, Any 1/4 or Lower 1/2 of E2PROM Array
• Low Power CMOS
    —<1∝A Standby Current
    —<3mA Active Current during Write
    —<400∝A Active Current during Read
• 1.8V to 3.6V, 2.7V-5.5V or 4.5V to 5.5V Operation
• Built-in Inadvertent Write Protection
    —Power-Up/Power-Down Protection Circuitry — Write Enable Latch
    —Write Protect Pin
• SPI Modes (0,0 & 1,1)
• 512 x 8 Bits
    —16 Byte Page Mode
• Self-Timed Write Cycle
    —5ms Write Cycle Time (Typical)
• High Reliability
    —Endurance: 100,000 Cycles/Byte
    —Data Retention: 100 Years
    —ESD: 2000V on all pins
• 8-Lead MSOP Package
• 8-Lead TSSOP Package
• 8-Lead SOIC Package
• 8-Lead PDIP Package