DESCRIPTION
The X25642 is a CMOS 65,536-bit serial E2PROM, internally organized as 8K x 8. The X25642 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
• 2MHz Clock Rate
• Low Power CMOS
    —<1µA Standby Current
    —<5mA Active Current
• 2.7V To 5.5V Power Supply
• SPI Modes (0,0 & 1,1)
• 8K X 8 Bits
    —32 Byte Page Mode
• Block Lock Protection
    —Protect 1/4, 1/2 or all of E2PROM Array
• Built-in Inadvertent Write Protection
    —Power-Up/Down protection circuitry
    —Write Enable Latch
    —Write Protect Pin
• Self-Timed Write Cycle
    —5ms Write Cycle Time (Typical)
• High Reliability
    —Endurance: 100,000 cycles
    —Data Retention: 100 Years
    —ESD protection: 2000V on all pins
• Packages
    —8-Lead PDIP
    —8-Lead SOIC
    —14-Lead SOIC
    —20-Lead TSSOP