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| Part Number | AT28HC256-90FM/883-023 | 
| Datasheet | AT28HC256-90FM/883-023 datasheet | 
| Description | IC EEPROM 256K PARALLEL 28FLATPK | 
| Manufacturer | Microchip Technology | 
| Series | - | 
| Part Status | Active | 
| Memory Type | Non-Volatile | 
| Memory Format | EEPROM | 
| Technology | EEPROM | 
| Memory Size | 256Kb (32K x 8) | 
| Clock Frequency | - | 
| Write Cycle Time - Word, Page | 10ms | 
| Access Time | 90ns | 
| Memory Interface | Parallel | 
| Voltage - Supply | 4.5V ~ 5.5V | 
| Operating Temperature | -55°C ~ 125°C (TC) | 
| Mounting Type | Surface Mount | 
| Package / Case | 28-CFlatPack | 
| Supplier Device Package | 28-Flatpack, Ceramic Bottom-Brazed |