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| PartNumber | W78C438 | W78C438BF-24 | W78C438BF-40 |
| Description | |||
| Manufacturer | WINBOND | - | - |
| Product Category | Embedded - Microcontrollers | - | - |
| Series | W78 | - | - |
| Packaging | Tray | - | - |
| Package Case | 100-QFP | - | - |
| Operating Temperature | 0°C ~ 70°C (TA) | - | - |
| Supplier Device Package | * | - | - |
| Number of I O | 40 | - | - |
| Speed | 40MHz | - | - |
| EEPROM Size | - | - | - |
| Core Processor | 8051 | - | - |
| RAM Size | 256 x 8 | - | - |
| Program Memory Type | ROMless | - | - |
| Peripherals | - | - | - |
| Connectivity | EBI/EMI, Serial Port | - | - |
| Voltage Supply Vcc Vdd | 4.5 V ~ 5.5 V | - | - |
| Core Size | 8-Bit | - | - |
| Program Memory Size | - | - | - |
| Data Converters | - | - | - |
| Oscillator Type | External | - | - |