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| PartNumber | AT91SAM7XC256-AU | AT91SAM7XC256-CU-999 | AT91SAM7XC256B-AU |
| Description | ARM Microcontrollers - MCU LQFP IND TEMP | ARM Microcontrollers - MCU BGA Ind. Temp Green | ARM Microcontrollers - MCU IND TEMP MRL B |
| Manufacturer | Microchip | Microchip | Microchip |
| Product Category | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU |
| RoHS | Y | Y | Y |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Package / Case | LQFP-100 | BGA-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 | 20 MHz | 55 MHz | 55 MHz |
| Program Memory Size | 256 kB | 256 kB | 256 kB |
| Data RAM Size | 64 kB | 64 kB | 64 kB |
| 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 |
| Height | 1.4 mm | 0.75 mm | - |
| Length | 14 mm | 9 mm | - |
| Program Memory Type | Flash | Flash | Flash |
| Width | 14 mm | 9 mm | - |
| Brand | Microchip Technology / Atmel | Microchip Technology / Atmel | Microchip Technology / Atmel |
| Interface Type | SPI, TWI, UART | MII, SPI, TWI | CAN, Ethernet, 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 |
| Moisture Sensitive | Yes | - | Yes |
| Number of Timers/Counters | 4 Timer | 3 Timer | 3 Timer |
| Product Type | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU | ARM Microcontrollers - MCU |
| Factory Pack Quantity | 90 | 3000 | 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 |
| Part # Aliases | AT91SAM7XC256B-AU | AT91SAM7XC256B-CU-999 | - |
| Unit Weight | 0.046530 oz | - | 0.046530 oz |
| Shipping Restrictions | - | - | |
| Data RAM Type | - | - | SRAM |
| Processor Series | - | - | 91S |