The M95640, M95640-W, M95640-R and M95640-DR are 64 Kbit serial SPI bus EEPROMs with high-speed clock, which are produced by ST. The features of the product are: the memory array is 64 Kb (8 Kbytes) EEPROM, the page size is 32 bytes, it has Write lockable Page (Identification page), supports Byte Write within 5 ms and Page Write within 5 ms, supports Write Protect, the highest clock frequency is 20 MHz, the single supply voltage is 1.8 V to 5.5 V, supports 1 million Write cycles and 40-year data retention, and has Enhanced ESD Protection.
This document is a datasheet for the M95640, M95640-W, M95640-R, and M95640-DR series of 64 Kbit (8 Kbytes) electrically erasable programmable memory (EEPROM) devices. These devices are accessed via a high-speed Serial Peripheral Interface (SPI) bus and support a clock frequency of up to 20 MHz. They operate with a single supply voltage ranging from 1.8 V to 5.5 V and offer more than 1 million write cycles with over 40-year data retention. The M95640-DR variant includes an additional 32-byte Identification Page that can be permanently locked in read-only mode.
| Memory array size | 64 Kb (8 Kbytes) |
|---|---|
| Page size | 32 bytes |
| Write cycle time (Byte/Page) | within 5 ms |
| Maximum clock frequency | 20 MHz |
| Supply voltage range | 1.8 V to 5.5 V |
| Write cycles endurance | More than 1 million |
| Data retention | More than 40-year |
The devices are 64 Kbit devices organized as 8192 × 8 bits.
Yes, it offers an additional page named the Identification Page (32 bytes) which can be written and later permanently locked.
Available packages include UFDFPN8 (MB or MC), TSSOP8 (DW), and SO8 (MN).