CAT25C128/256 is a 128K/256K-Bit SPI Serial CMOS EEPROM manufactured by Catalyst, with 5 MHz SPI compatibility, 1.8 to 5.5 volt operation, hardware and software protection, low power CMOS technology, SPI mode (0,0 and 1,1), industrial and automotive temperature ranges, self-timed write cycle, 64-byte page write buffer, block write protection (can protect 1/4, 1/2 or the entire EEPROM array), 100,000 program/erase cycles, 100 years data retention, RoHS-compliant packages
The CAT25C128/256 EEPROM provides 128 Kbit or 256 Kbit memory organized as 16K×8 or 32K×8 bits. It operates via a standard SPI bus (compatible up to 5 MHz) with supply voltages from 1.8 V to 5.5 V, includes a 64‑byte page write buffer, and offers hardware and software write‑protect features. The device is supplied in 8‑pin DIP, 8‑pin SOIC, 14‑pin TSSOP and 20‑pin TSSOP packages.
Key electrical characteristics include a maximum operating current of 10 mA at 5 V/5 MHz, standby current as low as 10 yA, 100 k program/erase cycles, 100‑year data retention, and operation over industrial, automotive and extended temperature ranges (‑40 °C to +125 °C). Ordering information, pin configurations and revision history are also provided.
| Memory capacity | 128 Kbit / 256 Kbit |
|---|---|
| Maximum SPI clock | 5 MHz |
| Operating voltage | 1.8 V – 5.5 V |
| Endurance | 100 000 program/erase cycles |
| Data retention | 100 years |
| Page write buffer | 64 bytes |
| Package options | 8‑pin DIP, 8‑pin SOIC, 14‑pin TSSOP, 20‑pin TSSOP |
| Write/erase current (write) | 10 mA at 5 V, 5 MHz |
| Standby current | 10 yA |
| ESD susceptibility | 2000 V |
| Operating temperature range | ‑40 °C to +125 °C (Extended) |
The device is compatible with SPI clocks up to 5 MHz.
It is rated for 100 000 program/erase cycles.
The EEPROM retains data for up to 100 years.
It is offered in 8‑pin DIP, 8‑pin SOIC, 14‑pin TSSOP and 20‑pin TSSOP packages.