Datasheet

333
8018P–AVR–08/10
ATmega169P
28.4.3 External Clock Drive
28.5 System and Reset Characteristics
Note: 1. The Power-on Reset will not work unless the supply voltage has been below V
POT
(falling)
Table 28-3. External Clock Drive
Symbol Parameter
V
CC
= 1.8V - 5.5V V
CC
= 2.7V - 5.5V V
CC
= 4.5V - 5.5V
UnitsMin. Max. Min. Max. Min. Max.
1/t
CLCL
Oscillator
Frequency
0108016MHz
t
CLCL
Clock Period 1000 125 62.5
nst
CHCX
High Time 400 50 25
t
CLCX
Low Time 400 50 25
t
CLCH
Rise Time 2.0 1.6 0.5
μs
t
CHCL
Fall Time 2.0 1.6 0.5
Δt
CLCL
Change in period
from one clock
cycle to the next
22 2%
Table 28-4. Reset, Brown-out,and Internal Voltage Characteristics
Symbol Parameter Condition Min Typ Max Units
V
POT
Power-on Reset Threshold
Voltage (rising)
T
A
= -40°C
to 85°C
0.7 1.0 1.4
V
Power-on Reset Threshold
Voltage (falling)
(1)
T
A
= -40°C
to 85°C
0.05 0.9 1.3
V
PSR
Power-on Reset Slope Rate 0.1 4.5 V/ms
V
RST
RESET Pin Threshold Voltage V
CC
= 3V 0.2V
CC
0.9V
CC
V
t
RST
Minimum pulse width on RESET
Pin
V
CC
= 3V 2.5 µs
V
HYST
Brown-out Detector Hysteresis 50 mV
t
BOD
Min Pulse Width on Brown-out
Reset
2µs
V
BG
Bandgap reference voltage
V
CC
= 2.7V,
T
A
=25°C
1.0 1.1 1.2 V
t
BG
Bandgap reference start-up time
V
CC
= 2.7V,
T
A
=25°C
40 70 µs
I
BG
Bandgap reference current
consumption
V
CC
= 2.7V,
T
A
=25°C
15 µA