Datasheet

Symbol Parameter V
CC
= 1.8 - 5.5V V
CC
= 2.7 - 5.5V V
CC
= 4.5 - 5.5V Units
Min. Max. Min. Max. Min. Max.
t
CLCH
Rise Time - 2.0 - 1.6 - 0.5 μs
t
CHCL
Fall Time - 2.0 - 1.6 - 0.5 μs
Δt
CLCL
Change in period from one clock
cycle to the next
- 2 - 2 - 2 %
29.5. System and Reset Characteristics
Table 29-6. Reset, Brown-out and Internal Voltage Characteristics
Symbol Parameter Condition Min. Typ Max Units
V
POT
Power-on Reset Threshold Voltage (rising) 1.1 1.4 1.6 V
Power-on Reset Threshold Voltage (falling)
(1)
0.6 1.3 1.6 V
SR
ON
Power-on Slope Rate 0.01 - 10 V/ms
V
RST
RESET Pin Threshold Voltage 0.2 V
CC
- 0.9 V
CC
V
t
RST
Minimum pulse width on RESET Pin - - 2.5 μs
V
HYST
Brown-out Detector Hysteresis - 50 - mV
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 29-7. 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
Atmel ATmega644A [DATASHEET]
Atmel-42716C-ATmega644A_Datasheet_Complete-10/2016
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