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| Part Number | 23K640-I/P | 23A640-I/P | 23K640-E/P | 
|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | 
| Product Status | Active | Active | Active | 
| Memory Type | Volatile | Volatile | Volatile | 
| Memory Format | SRAM | SRAM | SRAM | 
| Technology | SRAM | SRAM | SRAM | 
| Memory Size | 64Kb (8K x 8) | 64Kb (8K x 8) | 64Kb (8K x 8) | 
| Memory Interface | SPI | SPI | SPI | 
| Clock Frequency | 20 MHz | 20 MHz | 20 MHz | 
| Write Cycle Time - Word, Page | - | - | - | 
| Access Time | - | - | - | 
| Voltage - Supply | 2.7V ~ 3.6V | 1.7V ~ 1.95V | 2.7V ~ 3.6V | 
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 125°C (TA) | 
| Mounting Type | Through Hole | Through Hole | Through Hole | 
| Package / Case | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | 8-DIP (0.300", 7.62mm) | 
| Supplier Device Package | 8-PDIP | 8-PDIP | 8-PDIP |