The NM34W02 2K-Bit Standard 2-Wire Bus Interface Serial EEPROM with Full Array Write Protect is described.
The NM34W02 is a 2‑Kbit CMOS non‑volatile EEPROM designed for I²C (2‑wire) bus applications such as Serial Presence Detect on memory modules. It offers permanent write‑protect for the first 128 bytes and optional hardware or software protection for the entire array.
The device is supplied in 8‑pin TSSOP or SO packages, operates from 2.7 V to 5.5 V, and provides a 16‑byte page write mode, 40‑year data retention, and up to 1 million write cycles.
| Memory size | 2048 bits (2 Kbit) |
|---|---|
| Operating voltage range | 2.7 V – 5.5 V |
| Write cycle time (standard) | 6 ms |
| Endurance | 1 000 000 data changes |
| Data retention | > 40 years |
| Package options | 8‑pin TSSOP, 8‑pin SO |
| Temperature range | -40 °C – +85 °C |
| Page write size | 16 bytes |
The typical write cycle time is 6 ms for the standard version (15 ms for the L and LZ versions).
The device supports a sixteen‑byte page write mode.
They can be permanently write‑protected by writing to the WRITE PROTECT (WP) register, which is a one‑time‑only register.
The device can operate up to 5.5 V.