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| Part Number | AT28HC256F-90TA | AT28HC256F-90TC | AT28HC256F-90TI | AT28HC256F-90TU | AT28HC256-90TA | AT28HC256F-90JA | AT28HC256F-90SA |
|---|---|---|---|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Product Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
| Memory Type | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile |
| Memory Format | EEPROM | EEPROM | EEPROM | EEPROM | EEPROM | EEPROM | EEPROM |
| Technology | EEPROM | EEPROM | EEPROM | EEPROM | EEPROM | EEPROM | EEPROM |
| Memory Size | 256Kb (32K x 8) | 256Kb (32K x 8) | 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 | Parallel | Parallel |
| Clock Frequency | - | - | - | - | - | - | - |
| Write Cycle Time - Word, Page | 3ms | 3ms | 3ms | 3ms | 10ms | 3ms | 3ms |
| Access Time | 90 ns | 90 ns | 90 ns | 90 ns | 90 ns | 90 ns | 90 ns |
| 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 |
| Operating Temperature | -40°C ~ 125°C (TC) | 0°C ~ 70°C (TC) | -40°C ~ 85°C (TC) | -40°C ~ 85°C (TC) | -40°C ~ 125°C (TC) | -40°C ~ 125°C (TC) | -40°C ~ 125°C (TC) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 28-TSSOP (0.465", 11.80mm Width) | 28-TSSOP (0.465", 11.80mm Width) | 28-TSSOP (0.465", 11.80mm Width) | 28-TSSOP (0.465", 11.80mm Width) | 28-TSSOP (0.465", 11.80mm Width) | 32-LCC (J-Lead) | 28-SOIC (0.295", 7.50mm Width) |
| Supplier Device Package | 28-TSOP | 28-TSOP | 28-TSOP | 28-TSOP | 28-TSOP | 32-PLCC (13.97x11.43) | 28-SOIC |
