This document describes the features of the M95320 and M95640 series 32Kbit and 64Kbit serial SPI bus EEPROMs, including compatibility with SPI bus serial interface, single supply voltage, multiple clock rates, write time, status register, hardware protection, byte and page write, self-timed programming cycle, adjustable size read-only EEPROM area, enhanced ESD protection, more than 100,000 or 1 million erase/write cycles (depending on ordering options), and more than 40-year data retention.
The M95320 (32 Kbit) and M95640 (64 Kbit) EEPROM devices are accessed via a high‑speed SPI‑compatible serial bus. They support multiple voltage options (4.5‑5.5 V for standard parts, 2.5‑5.5 V for ‑W, 1.8‑5.5 V for ‑R, and 1.65‑5.5 V for ‑S versions) and clock rates up to 20 MHz. Write times are 5 ms or 10 ms, and the devices offer robust endurance and data retention.
The families are offered in PDIP8, SO8, TSSOP8, and MLP8 packages, with detailed mechanical dimensions and pin‑out diagrams. Electrical characteristics such as maximum ratings, DC/AC parameters, and status register functions are provided, along with SPI mode support (CPOL=0/CPHA=0 and CPOL=1/CPHA=1).
| Supply Voltage (M95320, M95640) | 4.5 V to 5.5 V |
|---|---|
| Supply Voltage (M95320‑R, M95640‑R) | 1.8 V to 5.5 V |
| Supply Voltage (M95320‑S, M95640‑S) | 1.65 V to 5.5 V |
| Maximum Clock Rate | 20 MHz, 10 MHz, 5 MHz, 2 MHz |
| Write Time | 5 ms or 10 ms |
| Endurance | ≥100 k or 1 M erase/write cycles (depending on options) |
| Data Retention | ≥40 years |
They support more than 100 k cycles, or up to 1 M cycles depending on ordering options.
Data retention is specified for more than 40 years.