| Part Numbers | Manufacturer Name | Datasheet | Core Processor | Core Size | Speed | Connectivity | RAM Size | Number of I/O | Program Memory Size | Program Memory Type | EEPROM Size | Voltage - Supply (Vcc/Vdd) | Data Converters | Oscillator Type | Operating Temperature | Package / Case |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| W78C438C40FL | NUVOTON TECHNOLOGY CORP | 8051 | 8-Bit | 40MHz | EBI/EMI, Serial Port | 40 | - | ROMless | - | 256 x 8 | 4.5 V ~ 5.5 V | - | External | 0°C ~ 70°C | 100-QFP | |
| W78C438C40PL | NUVOTON TECHNOLOGY CORP | 8051 | 8-Bit | 40MHz | EBI/EMI, Serial Port | 40 | - | ROMless | - | 256 x 8 | 4.5 V ~ 5.5 V | - | External | 0°C ~ 70°C | 84-PLCC | |
| P80C557E4EFB/01,51 | NXP SEMICONDUCTORS | 8051 | 8-Bit | 16MHz | EBI/EMI, I²C, UART/USART | 40 | - | ROMless | - | 1K x 8 | 4.5 V ~ 5.5 V | A/D 8x10b | External | -40°C ~ 85°C | 80-BQFP | |
| P80C557E4EFB/01,55 | NXP SEMICONDUCTORS | 8051 | 8-Bit | 16MHz | EBI/EMI, I²C, UART/USART | 40 | - | ROMless | - | 1K x 8 | 4.5 V ~ 5.5 V | A/D 8x10b | External | -40°C ~ 85°C | 80-BQFP | |
| P87C557E8EFB/01,55 | NXP SEMICONDUCTORS | 8051 | 8-Bit | 16MHz | EBI/EMI, I²C, UART/USART | 40 | 64KB (64K x 8) | OTP | - | 2K x 8 | 4.5 V ~ 5.5 V | A/D 8x10b | External | -40°C ~ 85°C | 80-BQFP |
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