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| Part Number | AT27C256R-90PA | AT27C256R-90PC | AT27C256R-90PI | AT27C256R-70PA |
|---|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Product Status | Obsolete | Obsolete | Obsolete | Obsolete |
| Memory Type | Non-Volatile | Non-Volatile | Non-Volatile | Non-Volatile |
| Memory Format | EPROM | EPROM | EPROM | EPROM |
| Technology | 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) |
| Memory Interface | Parallel | Parallel | Parallel | Parallel |
| Clock Frequency | - | - | - | - |
| Write Cycle Time - Word, Page | - | - | - | - |
| Access Time | 90 ns | 90 ns | 90 ns | 70 ns |
| Voltage - Supply | 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 ~ 125°C (TC) |
| Mounting Type | Through Hole | Through Hole | Through Hole | Through Hole |
| Package / Case | 28-DIP (0.600", 15.24mm) | 28-DIP (0.600", 15.24mm) | 28-DIP (0.600", 15.24mm) | 28-DIP (0.600", 15.24mm) |
| Supplier Device Package | 28-PDIP | 28-PDIP | 28-PDIP | 28-PDIP |
