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| PartNumber | N87C51RB | N87C51RB1 | N87C51RB24 |
| Description | Microcontrolle | Microcontrolle | |
| Manufacturer | Intel | Intel | Intel |
| Product Category | Embedded - Microcontrollers | Embedded - Microcontrollers | Embedded - Microcontrollers |
| Series | 87C | 87C | 87C |
| Packaging | Tube | Tube | Tube |
| Package Case | 44-LCC (J-Lead) | 44-LCC (J-Lead) | 44-LCC (J-Lead) |
| Operating Temperature | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TA) | 0°C ~ 70°C (TA) |
| Supplier Device Package | 44-PLCC | 44-PLCC | 44-PLCC |
| Number of I O | 32 | 32 | 32 |
| Speed | 16MHz | 16MHz | 24MHz |
| EEPROM Size | - | - | - |
| Core Processor | MCS 51 | MCS 51 | MCS 51 |
| RAM Size | 512 x 8 | 512 x 8 | 512 x 8 |
| Program Memory Type | OTP | OTP | OTP |
| Peripherals | WDT | WDT | WDT |
| Connectivity | SIO | SIO | SIO |
| Voltage Supply Vcc Vdd | 4 V ~ 6 V | 4 V ~ 6 V | 4.5 V ~ 5.5 V |
| Core Size | 8-Bit | 8-Bit | 8-Bit |
| Program Memory Size | 16KB (16K x 8) | 16KB (16K x 8) | 16KB (16K x 8) |
| Data Converters | - | - | - |
| Oscillator Type | External | External | External |