Datasheet

354
8284D–AVR–6/11
ATmega169A/PA/329A/PA/3290A/PA/649A/P/6490A/P
29.6.2 ATmega329A/329PA/3290A/3290PA/649A/649P/6490A/6490PA
revision A and B
Note: 1. The Power-on Reset will not work unless the supply voltage has been below V
POT
(falling)
29.7 Brown-out Detection
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 guar-
antees 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, 101 and 100.
29.8 External Interrupts Characteristics
Table 29-16. Reset, Brown-out, and Internal Voltage Reference Characteristics,
T
A
= -40°C to 85°C
Symbol Parameter Min. Typ Max Units
V
POT
Power-on Reset Threshold Voltage (rising) 0.7 1.0 1.4
V
Power-on Reset Threshold Voltage (falling)
(1)
0.05 0.9 1.3
SR
ON
Power-on Slope Rate 0.01 4.5 V/ms
Table 29-17. BODLEVEL Fuse Coding
(1)
BODLEVEL[2:0] Fuses Min. V
BOT
Typ V
BOT
Max V
BOT
Units
111 BOD Disabled
110 1.7 1.8 2.0
V101 2.5 2.7 2.9
100 4.1 4.3 4.5
011
Reserved
010
001
000
Table 29-18. Asynchronous External Interrupt Characteristics
Symbol Parameter Condition Min Typ Max Units
t
INT
Minimum pulse width for asynchronous external interrupt 50 ns