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| Part Number | AT87F55WD-24PI | AT87F55WD-24AI | AT87F55WD-24JI | AT87F55WD-24PC |
|---|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Product Status | Obsolete | Obsolete | Obsolete | Obsolete |
| Core Processor | 8051 | 8051 | 8051 | 8051 |
| Core Size | 8-Bit | 8-Bit | 8-Bit | 8-Bit |
| Speed | 24MHz | 24MHz | 24MHz | 24MHz |
| Connectivity | UART/USART | UART/USART | UART/USART | UART/USART |
| Peripherals | WDT | WDT | WDT | WDT |
| Number of I/O | 32 | 32 | 32 | 32 |
| Program Memory Size | 20KB (20K x 8) | 20KB (20K x 8) | 20KB (20K x 8) | 20KB (20K x 8) |
| Program Memory Type | OTP Quick FLASH | OTP Quick FLASH | OTP Quick FLASH | OTP Quick FLASH |
| EEPROM Size | - | - | - | - |
| RAM Size | 256 x 8 | 256 x 8 | 256 x 8 | 256 x 8 |
| Voltage - Supply (Vcc/Vdd) | 4V ~ 5.5V | 4V ~ 5.5V | 4V ~ 5.5V | 4V ~ 5.5V |
| Data Converters | - | - | - | - |
| Oscillator Type | Internal | Internal | Internal | Internal |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C | -40°C ~ 85°C | 0°C ~ 70°C |
| Mounting Type | Through Hole | Surface Mount | Surface Mount | Through Hole |
| Package / Case | 40-DIP (0.600", 15.24mm) | 44-TQFP | 44-LCC (J-Lead) | 40-DIP (0.600", 15.24mm) |
| Supplier Device Package | 40-PDIP | 44-TQFP (10x10) | 44-PLCC (16.6x16.6) | 40-PDIP |
