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| Part Number | AT28BV256-20SU | AT28BV256-20TU | AT28BV256-20JU | AT28BV256-20SA | AT28BV256-20SC | AT28BV256-20SI | 
|---|---|---|---|---|---|---|
| Manufacturer | Microchip Technology | Atmel | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | 
| Product Status | Active | Active | Active | Obsolete | Obsolete | Obsolete | 
| Memory Type | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile | 
| Memory Format | EEPROM | EEPROM | EEPROM | EEPROM | EEPROM | EEPROM | 
| Technology | 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) | 
| Memory Interface | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel | 
| Clock Frequency | - | - | - | - | - | - | 
| Write Cycle Time - Word, Page | 10ms | 10ms | 10ms | 10ms | 10ms | 10ms | 
| Access Time | 200 ns | 200 ns | 200 ns | 200 ns | 200 ns | 200 ns | 
| Voltage - Supply | 2.7V ~ 3.6V | 2.7V ~ 3.6V | 2.7V ~ 3.6V | 2.7V ~ 3.6V | 2.7V ~ 3.6V | 2.7V ~ 3.6V | 
| Operating Temperature | -40°C ~ 85°C (TC) | -40°C ~ 85°C (TC) | -40°C ~ 85°C (TC) | -40°C ~ 125°C (TC) | 0°C ~ 70°C (TC) | -40°C ~ 85°C (TC) | 
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | 
| Package / Case | 28-SOIC (0.295", 7.50mm Width) | 28-TSSOP (0.465", 11.80mm Width) | 32-LCC (J-Lead) | 28-SOIC (0.295", 7.50mm Width) | 28-SOIC (0.295", 7.50mm Width) | 28-SOIC (0.295", 7.50mm Width) | 
| Supplier Device Package | 28-SOIC | 28-TSOP | 32-PLCC (13.97x11.43) | 28-SOIC | 28-SOIC | 28-SOIC |