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| PartNumber | AT27C256R-70TC | AT27C256R-70TU | AT27C256R-70TI |
| Description | IC EPROM 256K PARALLEL 28TSOP | IC EPROM 256K PARALLEL 28TSOP | IC EPROM 256K PARALLEL 28TSOP |
| Manufacturer | Atmel | - | - |
| Product Category | Memory | - | - |
| Series | - | - | - |
| Packaging | Tray | - | - |
| Package Case | 28-TSSOP (0.465", 11.80mm Width) | - | - |
| Operating Temperature | 0°C ~ 70°C (TC) | - | - |
| Interface | Parallel | - | - |
| Voltage Supply | 4.5 V ~ 5.5 V | - | - |
| Supplier Device Package | 28-TSOP | - | - |
| Memory Size | 256K (32K x 8) | - | - |
| Memory Type | EPROM OTP | - | - |
| Speed | 70ns | - | - |
| Format Memory | EPROMs | - | - |