DESCRIPTION
The X25F128 is a 131,072-bit CMOS SerialFlash memory, internally organized 16K X 8. It features a “Univolt” Program and Read voltage, 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 Serial Interface
• 16K X 8 Bits
    —32 Byte Small Sector Program Mode
• Low Power CMOS
    —<1µA Standby Current
    —<5mA Active Current
• 1.8V – 3.6V or 5V “Univolt” Read and
    Program Power Supply Versions
• Block Lock Protection
    —Protect 1/4, 1/2 or all of E2PROM Array
• Built-in Inadvertent Program Protection
    —Power-Up/Power-Down protection circuitry
    —Program Enable Latch
    —Program Protect Pin
• Self-Timed Program Cycle
    —5ms Program Cycle Time (Maximum)
• High Reliability
    —Endurance: 100,000 cycles per byte
    —Data Retention: 100 Years
    —ESD protection: 2000V on all pins
• 8-Lead PDlP Package
• 16-Lead 150 mil SOIC Package