ATtiny261A datasheet(185/292 Pages) ATMEL

185 / 292 page

185

8197A–AVR–10/09

ATtiny261A/461A/861A

Notes: 1. “Min” means the lowest value where the pin is guaranteed to be read as high.

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

3. 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.

4. 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.

5. 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 20-32, Figure 20-33, Figure 20-34, and Figure 20-35

(starting on page 210).

6. Values using methods described in “Minimizing Power Consumption” on page 36. Power Reduction is enabled (PRR =

0xFF) and there is no I/O drive.

7. BOD Disabled.

19.3 Speed Grades

The maximum operating frequency of the device depends on VCC . As shown in Figure 19-1 the

maximum frequency vs. VCC relationship is linear between 1.8V < VCC < 4.5V.

Figure 19-1. Maximum Frequency vs. VCC

ICC

Power Supply Current

Active 1MHz, VCC = 2V

(6)

0.2

0.5

Active 4MHz, VCC = 3V

(6)

1.2

Active 8MHz, VCC = 5V

(6)

3.6

Idle 1MHz, VCC = 2V

(6)

0.035

0.15

Idle 4MHz, VCC = 3V

(6)

0.25

0.4

Idle 8MHz, VCC = 5V

(6)

0.9

1.5

Power-down mode

WDT enabled, VCC = 3V

(7)

410

µA

WDT disabled, VCC = 3V

(7)

0.15

µA

Table 19-1.

DC Characteristics. TA = -40°C to 85°C, VCC = 1.8V to 5.5V (unless otherwise noted).

Symbol

Parameter

Condition

Min (1)

Typ

Max (2)

Units

4 MHz

1.8V

5.5V

4.5V

20 MHz

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