This document introduces the features and characteristics of M95320 and M95640 32Kbit and 64Kbit Serial SPI Bus EEPROMs With High Speed Clock products, including compatibility with SPI Bus Serial Interface, single power supply voltage, 20MHz, 10MHz, 5MHz or 2MHz clock rates, 5ms or 10ms Write Time, Status Register, Hardware Protection of the Status Register, BYTE and PAGE WRITE, Self-Timed Programming Cycle, Adjustable Size Read-Only EEPROM Area, Enhanced ESD Protection, More than 100000 or 1 million Erase/Write Cycles, More than 40-Year Data Retention, etc.
The STMicroelectronics M95320 and M95640 series are 32‑Kbit and 64‑Kbit serial SPI EEPROMs offering high‑speed operation and a range of supply‑voltage options. They are available in PDIP8, TSSOP8, and MLP8 packages and support single‑supply operation.
Key features include selectable clock rates up to 20 MHz, write times of 5 ms or 10 ms, endurance of up to 1 million erase/write cycles, and data retention exceeding 40 years. The datasheet details pin configurations, signal timing, and electrical characteristics for each variant.
| Supply Voltage (M95320 / M95640) | 4.5 V to 5.5 V |
|---|---|
| Supply Voltage (M95320‑W) | 2.5 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 |
| Clock Rate | 2 MHz, 5 MHz, 10 MHz, 20 MHz |
| Write Time | 5 ms or 10 ms |
| Endurance | 100 000 – 1 000 000 erase/write cycles |
| Data Retention | ≥ 40 years |
They operate from 4.5 V to 5.5 V for the standard versions, with lower‑voltage options for the ‑W, ‑R, and ‑S variants.
The devices support clock rates of 2 MHz, 5 MHz, 10 MHz, or 20 MHz.
Depending on the ordering option, they can handle more than 100 000 up to 1 million erase/write cycles.