| Part Number | AT28C64-20PC | AT28C64-20SC | 
|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | 
| Category | Memory | Memory | 
|   |   | |
| Product Status | Obsolete | Obsolete | 
| Memory Type | Non-Volatile | Non-Volatile | 
| Memory Format | EEPROM | EEPROM | 
| Technology | EEPROM | EEPROM | 
| Memory Size | 64Kb (8K x 8) | 64Kb (8K x 8) | 
| Memory Interface | Parallel | Parallel | 
| Clock Frequency | - | - | 
| Write Cycle Time - Word, Page | 1ms | 1ms | 
| Access Time | 200 ns | 200 ns | 
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V | 
| Operating Temperature | 0°C ~ 70°C (TC) | 0°C ~ 70°C (TC) | 
| Mounting Type | Through Hole | Surface Mount | 
| Package / Case | 28-DIP (0.600", 15.24mm) | 28-SOIC (0.295", 7.50mm Width) | 
| Supplier Device Package | 28-PDIP | 28-SOIC |