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| Part Number | AT89LP51ID2-20AAU | AT89LP51ID2-20AU | AT89LP51RD2-20AAU | AT89LP51ED2-20AAU | AT89LP51IC2-20AAU |
|---|---|---|---|---|---|
| Manufacturer | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Atmel |
| Product Status | Active | Active | Active | Active | Active |
| Core Processor | 8051 | 8051 | 8051 | 8051 | 8051 |
| Core Size | 8-Bit | 8-Bit | 8-Bit | 8-Bit | 8-Bit |
| Speed | 20MHz | 20MHz | 20MHz | 20MHz | 20MHz |
| Connectivity | EBI/EMI, I²C, SPI, UART/USART | EBI/EMI, I²C, SPI, UART/USART | EBI/EMI, I²C, SPI, UART/USART | EBI/EMI, I²C, SPI, UART/USART | EBI/EMI, I²C, SPI, UART/USART |
| Peripherals | Brown-out Detect/Reset, POR, PWM, WDT | Brown-out Detect/Reset, POR, PWM, WDT | Brown-out Detect/Reset, POR, PWM, WDT | Brown-out Detect/Reset, POR, PWM, WDT | Brown-out Detect/Reset, POR, PWM, WDT |
| Number of I/O | 40 | 40 | 40 | 40 | 40 |
| Program Memory Size | 64KB (64K x 8) | 64KB (64K x 8) | 64KB (64K x 8) | 64KB (64K x 8) | 32KB (32K x 8) |
| Program Memory Type | Flash | Flash | Flash | Flash | Flash |
| EEPROM Size | 4K x 8 | 4K x 8 | - | 4K x 8 | - |
| RAM Size | 2.25K x 8 | 2.25K x 8 | 2.25K x 8 | 2.25K x 8 | 1.375K x 8 |
| Voltage - Supply (Vcc/Vdd) | 2.4V ~ 5.5V | 2.4V ~ 5.5V | 2.4V ~ 5.5V | 2.4V ~ 5.5V | 2.4V ~ 5.5V |
| Data Converters | A/D 7x10b | A/D 7x10b | A/D 7x10b | A/D 7x10b | A/D 7x10b |
| Oscillator Type | Internal | Internal | Internal | Internal | Internal |
| Operating Temperature | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) | -40°C ~ 85°C (TA) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Package / Case | 44-LQFP | 44-TQFP | 44-LQFP | 44-LQFP | 44-LQFP |
| Supplier Device Package | 44-LQFP (10x10) | 44-TQFP (10x10) | 44-LQFP (10x10) | 44-LQFP (10x10) | 44-LQFP (10x10) |
