DESCRIPTION
The IS25C128 and IS25C256 are electrically erasable PROM devices that use the Serial Peripheral Interface (SPI) for communications. The IS25C128 is 128Kbit (16K x 8) and the IS25C256 is 256Kbit (32K x 8). The IS25C128/256 EEPROMs are offered in a wide operating voltage range of 1.8V to 5.5V for compatibility with most application voltages. ISSI designed the IS25C128/256 to be an efficient SPI EEPROM solution. The devices are packaged in 8-pin JEDEC SOIC, 8-pin EIAJ SOIC, and 8-pin PDIP.

FEATURES
• Serial Peripheral Interface (SPI) Compatible
    — Supports SPI Modes 0 (0,0) and 3 (1,1)
• Low power CMOS
    — Active current less than 3.0 mA (2.5V)
    — Standby current less than 20 µA (2.5V)
• Low-voltage Operation
    — Vcc = 1.8V to 5.5V
• Block Write Protection
    — Protect 1/4, 1/2, or Entire Array
• 64 byte page write mode
    — Partial page writes allowed
• 2.1 MHz Clock Rate (5V)
• Self timed write cycles
    — 5ms max @ 2.5V
• High-reliability
    — Endurance: 1,000,000 cycles per byte
    — Data retention: 100 years
• 8-pin JEDEC SOIC, 8-pin EIAJ SOIC, and 8-pin PDIP packages available
• Industrial and Automotive temperature ranges
• Lead-free available