Purpose: Operating conditions and absolute maximum ratings.

Namespace: atmega2560::electrical.

The standard ATmega2560 16 MHz ordering grade is specified for 4.5–5.5 V. The related ATmega2560V ordering variant supports lower supply voltages with reduced maximum frequency; select it explicitly with MCU_GRADE_LOW_VOLTAGE.

#include <atmega2560/Electrical.h>
 
namespace mcu = atmega2560;
 
static_assert(mcu::electrical::standard::max_cpu_frequency_hz == 16000000UL, "ATmega2560 Electrical definition");
static_assert(mcu::electrical::absolute_maximum::max_vcc_mv == 6000, "ATmega2560 absolute maximum");

Operating conditions

Variant	Supply	Maximum frequency
ATmega2560	4.5–5.5 V	16 MHz
ATmega2560V	1.8–5.5 V	2 MHz at 1.8 V; 8 MHz at 2.7 V and above

Both ordering grades have an industrial operating temperature range of −40 °C to +85 °C.

Absolute maximum ratings

These are stress limits, not recommended operating conditions. Exceeding them may permanently damage the device.

Parameter	Limit
Operating temperature	−55 °C to +125 °C
Storage temperature	−65 °C to +150 °C
Any pin except RESET	−0.5 V to VCC + 0.5 V
RESET pin	−0.5 V to +13.0 V
VCC	6.0 V maximum
DC current per I/O pin	40 mA maximum
DC current through VCC/GND pins	200 mA maximum

These are hardware definitions, not runtime register access or initialization.

Source: ATmega2560 datasheet (DS40002211A), Sections 31.1–31.2 and 35.4.