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| Part Number | 25CS640T-I/SN | 25CS640T-I/Q4B | 25CS640T-I/ST | 25CS640T-I/MS | 25CS640T-H/SN |
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Series | - | - | - | - | - |
| Package/Case | - | 8-UFDFN Exposed Pad | - | - | 8-SOIC (0.154", 3.90mm Width) |
| Packaging | Tape & Reel (TR) | Tape & Reel (TR) | Tape & Reel (TR) | Tape & Reel (TR) | Tape & Reel (TR) |
| Product Status | Active | Active | Active | Active | Active |
| Programmable | Not Verified | - | Not Verified | Not Verified | - |
| Memory Type | - | Non-Volatile | - | - | Non-Volatile |
| Memory Format | EEPROM | EEPROM | EEPROM | EEPROM | EEPROM |
| Technology | - | EEPROM | - | - | EEPROM |
| Memory Size | 64Kbit | 64Kbit | 64Kbit | 64Kbit | 64Kbit |
| Memory Organization | 8K x 8 | 8K x 8 | 8K x 8 | 8K x 8 | 8K x 8 |
| Memory Interface | SPI | SPI | SPI | SPI | SPI |
| Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 10 MHz |
| Write Cycle Time - Word, Page | - | 4ms | - | - | 4ms |
| Access Time | - | 20 ns | - | - | 40 ns |
| Voltage - Supply | - | 1.7V ~ 5.5V | - | - | 2.5V ~ 5.5V |
| Operating Temperature | - | -40°C ~ 85°C (TA) | - | - | -40°C ~ 150°C (TA) |
| Grade | - | - | - | - | - |
| Qualification | - | - | - | - | - |
| Mounting Type | - | Surface Mount | - | - | Surface Mount |
| Supplier Device Package | - | 8-UDFN (2x3) | - | - | 8-SOIC |
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