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| Part Number | AT29C257-20JI | AT29C257-70JI | AT29C257-90JI | AT29C256-20JI | AT29C257-20JC |
|---|---|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Product Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
| Memory Type | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile |
| Memory Format | Flash | Flash | Flash | Flash | Flash |
| Technology | Flash | Flash | Flash | Flash | Flash |
| Memory Size | 256Kb (32K x 8) | 256Kb (32K x 8) | 256Kb (32K x 8) | 256Kb (32K x 8) | 256Kb (32K x 8) |
| Memory Interface | Parallel | Parallel | Parallel | Parallel | Parallel |
| Clock Frequency | - | - | - | - | - |
| Write Cycle Time - Word, Page | 10ms | 10ms | 10ms | 10ms | 10ms |
| Access Time | 200 ns | 70 ns | 90 ns | 200 ns | 200 ns |
| Voltage - Supply | 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 (TC) | -40°C ~ 85°C (TC) | -40°C ~ 85°C (TC) | -40°C ~ 85°C (TC) | 0°C ~ 70°C (TC) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 32-LCC (J-Lead) | 32-LCC (J-Lead) | 32-LCC (J-Lead) | 32-LCC (J-Lead) | 32-LCC (J-Lead) |
| Supplier Device Package | 32-PLCC (13.97x11.43) | 32-PLCC (13.97x11.43) | 32-PLCC (13.97x11.43) | 32-PLCC (13.97x11.43) | 32-PLCC (13.97x11.43) |
