Datasheet

Symbol Parameter Condition Min. Typ Max Units
t
BOD
Min. Pulse Width on Brown-out Reset - 2 - μs
V
BG
Bandgap reference voltage V
CC
=2.7
, T
A
=25°C
1.0 1.1 1.2 V
t
BG
Bandgap reference start-up time V
CC
=2.7
, T
A
=25°C
- 40 70 μs
I
BG
Bandgap reference current consumption V
CC
=2.7
, T
A
=25°C
- 10 - μA
Note:
1. The Power-on Reset will not work unless the supply voltage has been below V
POT
(falling)
Table 29-8. BODLEVEL Fuse Coding
BODLEVEL [2:0] Fuses Min. V
BOT
Typ V
BOT
Max V
BOT
Units
111 BOD Disabled
110 1.7 1.8 2.0 V
101 2.5 2.7 2.9
100 4.1 4.3 4.5
011 Reserved
010
001
000
Note:
1. V
BOT
may be below nominal minimum operating voltage for some devices. For devices where this
is the case, the device is tested down to V
CC
= V
BOT
during the production test. This guarantees
that a Brown-Out Reset will occur before V
CC
drops to a voltage where correct operation of the
microcontroller is no longer guaranteed. The test is performed using BODLEVEL = 110 and 101 .
29.6. External interrupts characteristics
Table 29-9. Asynchronous external interrupt characteristics.
Symbol Parameter Min. Typ. Max. Units
t
INT
Minimum pulse
width for
asynchronous
external
interrupt
- 50 - ns
Atmel ATmega644PA [DATASHEET]
Atmel-42717C-ATmega644PA_Datasheet_Complete-10/2016
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