ATtiny44 datasheet(175/236 Pages) ATMEL

175 / 236 page

175

8006H–AVR–10/09

ATtiny24/44/84

Notes:

1. All DC Characteristics contained in this data sheet are based on simulation and characterization of other AVR microcon-

trollers manufactured in the same process technology. These values are preliminary values representing design targets, and

will be updated after characterization of actual silicon.

2. “Min” means the lowest value where the pin is guaranteed to be read as high.

3. “Max” means the highest value where the pin is guaranteed to be read as low.

4. Although each I/O port can sink more than the test conditions (10 mA at VCC = 5V, 5 mA at VCC = 3V) under steady state

conditions (non-transient), the sum of all IOL (for all ports) should not exceed 60 mA. If IOL exceeds the test conditions, VOL

may exceed the related specification. Pins are not guaranteed to sink current greater than the listed test condition.

5. Although each I/O port can source more than the test conditions (10 mA at VCC = 5V, 5 mA at VCC = 3V) under steady state

conditions (non-transient), the sum of all IOH (for all ports) should not exceed 60 mA. If IOH exceeds the test condition, VOH

may exceed the related specification. Pins are not guaranteed to source current greater than the listed test condition.

6. The RESET pin must tolerate high voltages when entering and operating in programming modes and, as a consequence,

has a weak drive strength as compared to regular I/O pins. See Figure 21-24, Figure 21-25, Figure 21-26, and Figure 21-27

(starting on page 198).

20.3

Speed Grades

The maximum operating frequency of the device depends on V

CC. As shown in Figure 20-1 and

Figure 20-2, the maximum frequency vs. V

CC relationship is linear between 1.8V < VCC < 2.7V

and between 2.7V < V

CC < 4.5V.

Figure 20-1. Maximum Frequency vs. V

CC (ATtiny24V/44V/84V)

ICC

Power Supply Current

Active 1MHz, VCC = 2V

0.33

0.8

Active 4MHz, VCC = 3V

1.6

2.5

Active 8MHz, VCC = 5V

Idle 1MHz, VCC = 2V

0.11

0.4

Idle 4MHz, VCC = 3V

0.4

1.0

Idle 8MHz, VCC = 5V

1.5

3.5

Power-down mode

WDT enabled, VCC = 3V

4.5

µA

WDT disabled, VCC = 3V

0.15

µA

Table 20-1.

DC Characteristics. T

A = -40°C to +85°C (Continued)

Symbol

Parameter

Condition

Min

(1)

Typ

(1)

Max

(1)

Units

10 MHz

4 MHz

1.8V

2.7V

5.5V

Safe Operating Area

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