The X25C02 is a CMOS 2048-bit serial E2PROM, internally organized as 256 x 8. The X25C02 features a serial interface 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. The X25C02 also features two additional inputs that provide the end user with added flexibility. By asserting the HOLD input, the X25C02 will ignore transitions on its inputs, thus allowing the host to service higher priority interrupts. The WP input can be used as a hardwire input to the X25C02 disabling all write attempts, thus providing a mechanism for limiting end user capability of altering the memory. The X25C02 utilizes Xicor’s patented design and manufacturing techniques, including advanced automated processes, to ensure outstanding performance and reliability.
The X25C02 serial EEPROM provides 256 × 8 bits of non‑volatile memory accessed via a three‑wire SPI‑compatible interface. It features a 1 MHz clock rate, low‑power CMOS design, and built‑in write‑protect and hold functions for flexible system integration.
Electrical characteristics include a 5 V supply (±10 %), 150 µA standby current, 2 mA active current, and a typical 5 ms write cycle. The device offers 100 000 write cycles per byte, 100‑year data retention, and operates from –55 °C to +125 °C (military range). It is available in 8‑lead MSOP, PDIP, and SOIC packages.
| Clock Rate | 1 MHz |
|---|---|
| Supply Voltage | 5 V ±10 % |
| Standby Current | 150 µA |
| Active Current | 2 mA |
| Write Cycle Time (Typical) | 5 ms |
| Endurance | 100 000 cycles per byte |
| Data Retention | 100 years |
| Operating Temperature (Commercial) | 0 °C to +70 °C |
| Absolute Maximum Temperature (Bias) | –65 °C to +135 °C |
The device operates at a maximum clock rate of 1 MHz.
A typical write cycle completes in 5 ms.
The standby current is 150 µA.
Commercial range is 0 °C to +70 °C; industrial –40 °C to +85 °C; military –55 °C to +125 °C.