ATMEGA644PV ATMEL [ATMEL Corporation], ATMEGA644PV Datasheet - Page 328

• Manufacturer Part Number: ATMEGA644PV
• Description: 8-bit Microcontroller with 16/32/64K Bytes In-System Programmable Flash
• Manufacturer: ATMEL [ATMEL Corporation]

26.3
Table 26-3.
Notes:
26.3.1
26.3.2
328
Factory
Calibration
User
Calibration
Clock Characteristics
1. Voltage range for ATmega164PV/324PV/644PV.
2. Voltage range for ATmega164P/324P/644P.
ATmega164P/324P/644P
External Clock Drive Waveforms
External Clock Drive
Calibration Accuracy of Internal RC Oscillator
Figure 26-3. External Clock Drive Waveforms
Table 26-4.
Note:
Symbol
1/t
Δ
t
t
t
t
t
CHCX
CLCH
CHCL
CLCL
CLCX
7.3 - 8.1 MHz
t
CLCL
CLCL
Frequency
8.0 MHz
All DC Characteristics contained in this datasheet are based on simulation and characterization of
other AVR microcontrollers manufactured in the same process technology. These values are pre-
liminary values representing design targets, and will be updated after characterization of actual
silicon.
Parameter
Oscillator
Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
Change in period
from one clock
cycle to the next
External Clock Drive
V
IL1
V
IH1
1.8V - 5.5V
2.7V - 5.5V
V
3V
Min.
500
200
200
CC
V
0
CC
=1.8-5.5V
(1)
(2)
Max.
2.0
2.0
2
2
Min.
125
Temperature
V
-40°C - 85°C
50
50
0
CC
=2.7-5.5V
25°C
Max.
1.6
1.6
8
2
Min.
62.5
V
25
25
0
CC
Calibration Accuracy
=4.5-5.5V
Max.
±10%
0.5
0.5
±1%
16
8011D–AVR–02/07
2
Units
MHz
ns
ns
ns
μs
μs
%