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| Part Number | AT27C256R-15TI | AT27C256R-45TI | AT27C256R-55TI | AT27C256R-12TI | AT27C256R-15JI | AT27C256R-15PI | AT27C256R-15RI | AT27C256R-15TC |
|---|---|---|---|---|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Product Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
| Memory Type | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile |
| Memory Format | EPROM | EPROM | EPROM | EPROM | EPROM | EPROM | EPROM | EPROM |
| Technology | EPROM - OTP | EPROM - OTP | EPROM - OTP | EPROM - OTP | EPROM - OTP | EPROM - OTP | EPROM - OTP | EPROM - OTP |
| 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) | 256Kb (32K x 8) |
| Memory Interface | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel | Parallel |
| Clock Frequency | - | - | - | - | - | - | - | - |
| Write Cycle Time - Word, Page | - | - | - | - | - | - | - | - |
| Access Time | 150 ns | 45 ns | 55 ns | 120 ns | 150 ns | 150 ns | 150 ns | 150 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 | 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) | -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 | Through Hole | 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) | 32-LCC (J-Lead) | 28-DIP (0.600", 15.24mm) | 28-SOIC (0.342", 8.69mm Width) | 28-TSSOP (0.465", 11.80mm Width) |
| Supplier Device Package | 28-TSOP | 28-TSOP | 28-TSOP | 28-TSOP | 32-PLCC (13.97x11.43) | 28-PDIP | 28-SOIC | 28-TSOP |
