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See Product Specifications
| Part Number: | AT29C257-20JI | 
| Category: | Integrated Circuits (ICs) | 
| Subcategory: | Memory | 
| Manufacturer: | Microchip Technology | 
| Packaging: | Tube | 
| Product Status: | Obsolete | 
| Memory Type: | Non-Volatile | 
| Memory Format: | FLASH | 
| Technology: | FLASH | 
| Memory Size: | 256Kb (32K x 8) | 
| Memory Interface: | Parallel | 
| Clock Frequency: | - | 
| Write Cycle Time - Word, Page: | 10ms | 
| Access Time: | 200 ns | 
| Voltage - Supply: | 4.5V ~ 5.5V | 
| Operating Temperature: | -40°C ~ 85°C (TC) | 
| Mounting Type: | Surface Mount | 
| Package / Case: | 32-LCC (J-Lead) | 
| Supplier Device Package: | 32-PLCC (13.97x11.43) |