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| PartNumber | AT91SAM7X256B-AU-999 | AT91SAM7X256B-CU | AT91SAM7X256B-AU |
| Description | ARM Microcontrollers - MCU IND TEMP MRL B | ARM Microcontrollers - MCU IND TEMP MRL B | ARM Microcontrollers - MCU IND TEMP MRL B |
| Manufacturer | Microchip | Microchip | Microchip |
| Product Category | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | LQFP-100 | TFBGA-100 | LQFP-100 |
| Series | SAM7X/XC | SAM7X/XC | SAM7X/XC |
| Core | ARM7TDMI | ARM7TDMI | ARM7TDMI |
| Data Bus Width | 32 bit | 32 bit | 32 bit |
| Maximum Clock Frequency | 55 MHz | 55 MHz | 20 MHz |
| Program Memory Size | 256 kB | 256 kB | 256 kB |
| Data RAM Size | 64 kB | 64 kB | 64 kB |
| ADC Resolution | 10 bit | - | - |
| Number of I/Os | 62 I/O | 62 I/O | 62 I/O |
| Operating Supply Voltage | 1.8 V | 1.8 V | 1.8 V |
| Minimum Operating Temperature | - 40 C | - 40 C | - 40 C |
| Maximum Operating Temperature | + 85 C | + 85 C | + 85 C |
| Packaging | Reel | Tray | - |
| Product | MCU | - | - |
| Program Memory Type | Flash | Flash | - |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | Microchip Technology / Atmel |
| Data RAM Type | SRAM | SRAM | - |
| Interface Type | I2C, I2S, SPI, UART, USART, USB | CAN, Ethernet, I2S, SPI, TWI, USART, USB | - |
| Analog Supply Voltage | 3.3 V | 3.3 V | 3.3 V |
| I/O Voltage | 3.3 V | 3.3 V | 3.3 V |
| Number of Timers/Counters | 1 x 16 bit | 1 x 16 bit | 1 x 16 bit |
| Processor Series | SAM7X | 91S | AT91SAM |
| Product Type | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU |
| Factory Pack Quantity | 1000 | 260 | 180 |
| Subcategory | Microcontrollers - MCU | Microcontrollers - MCU | Microcontrollers - MCU |
| Supply Voltage Max | 1.95 V | 1.95 V | 1.95 V |
| Supply Voltage Min | 1.65 V | 1.65 V | 1.65 V |
| Watchdog Timers | Watchdog Timer | - | - |
| RoHS | - | Y | Y |
| Moisture Sensitive | - | Yes | Yes |
| Unit Weight | - | - | 0.046530 oz |