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| Part Number | 93C66BT-I/ST | 93C66CT-I/ST | 93C76BT-I/ST | 93C56BT-I/ST | 93C66AT-I/ST | 93C66B-I/ST | 93C66BT-E/ST | 93C66BT-I/OT | 93C66BT-I/SN | 
|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | 
| Product Status | Active | Active | Active | Active | Active | Active | Active | Active | Active | 
| Memory Type | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile | 
| Memory Format | EEPROM | EEPROM | EEPROM | EEPROM | EEPROM | EEPROM | EEPROM | EEPROM | EEPROM | 
| Technology | EEPROM | EEPROM | EEPROM | EEPROM | EEPROM | EEPROM | EEPROM | EEPROM | EEPROM | 
| Memory Size | 4Kb (256 x 16) | 4Kb (512 x 8, 256 x 16) | 8Kb (512 x 16) | 2Kb (128 x 16) | 4Kb (512 x 8) | 4Kb (256 x 16) | 4Kb (256 x 16) | 4Kb (256 x 16) | 4Kb (256 x 16) | 
| Memory Interface | SPI | SPI | SPI | SPI | SPI | SPI | SPI | SPI | SPI | 
| Clock Frequency | 2 MHz | 3 MHz | 3 MHz | 2 MHz | 2 MHz | 2 MHz | 2 MHz | 2 MHz | 2 MHz | 
| Write Cycle Time - Word, Page | 2ms | 2ms | 2ms | 2ms | 2ms | 2ms | 2ms | 2ms | 2ms | 
| Access Time | - | - | - | - | - | - | - | - | - | 
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 125°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | 
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | 
| Package / Case | 8-TSSOP (0.173", 4.40mm Width) | 8-TSSOP (0.173", 4.40mm Width) | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) | 8-TSSOP (0.173", 4.40mm Width) | 8-TSSOP (0.173", 4.40mm Width) | 8-TSSOP (0.173", 4.40mm Width) | 8-TSSOP (0.173", 4.40mm Width) | SOT-23-6 | 8-SOIC (0.154", 3.90mm Width) | 
| Supplier Device Package | 8-TSSOP | 8-TSSOP | 8-MSOP | 8-TSSOP | 8-TSSOP | 8-TSSOP | 8-TSSOP | SOT-23-6 | 8-SOIC |