Datasheet

33.4.3 External Clock Drive
Table 33-7. External Clock Drive
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.
1/t
CLCL
Oscillator Frequency 0 4 0 10 0 20 MHz
t
CLCL
Clock Period 250 - 100 - 50 - ns
t
CHCX
High Time 100 - 40 - 20 - ns
t
CLCX
Low Time 100 - 40 - 20 - ns
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 %
Related Links
13.12.1 OSCCAL
33.5 System and Reset Characteristics
Table 33-8. Reset, Brown-out and Internal Voltage Characteristics
(1)
Symbol Parameter Condition Min. Typ Max Units
V
POT
Power-on Reset Threshold Voltage (rising) 1.1 1.5 1.7 V
Power-on Reset Threshold Voltage (falling)
(2)
0.6 1.0 1.7 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. Values are guidelines only.
2. The Power-on Reset will not work unless the supply voltage has been below VPOT (falling)
ATmega48PA/88PA/168PA
Electrical Characteristics
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40002011A-page 390