
153
ATtiny40 [DATASHEET]
8263B–AVR–01/2013
Notes:
1. Typical values at 25
C.
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 I
OL (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 I
OH (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,
enabled (PRR = 0xFF) and there is no I/O drive.
8. BOD Disabled.
20.3
Speed
The maximum operating frequency of the device depends on V
between maximum frequency vs. V
CC is linear between 1.8V < VCC < 2.7V, and 2.7V < VCC <4.5V.
Figure 20-1. Maximum Frequency vs. V
CC
ICC
Active 1MHz, V
CC = 2V
0.2
0.6
mA
Active 4MHz, V
CC = 3V
1.1
2
mA
Active 8MHz, VCC = 5V
3.2
5
mA
Idle 1MHz, V
CC = 2V
0.03
0.2
mA
CC = 3V
0.2
0.5
mA
Idle 8MHz, VCC = 5V
0.8
1.5
mA
WDT enabled, V
CC = 3V
4.5
10
A
WDT disabled, VCC = 3V
0.15
2
A
Table 20-1.
DC Characteristics. T
A = -40C to +85C (Continued)
Symbol
Parameter
Condition
Min
Typ(1)
Max
Units
4 MHz
8 MHz
1.8V
5.5V
4.5V
2.7V
12 MHz