ATMEGA644P-A15MZ Atmel, ATMEGA644P-A15MZ Datasheet - Page 331

• Manufacturer Part Number: ATMEGA644P-A15MZ
• Description: MCU AVR 64KB FLASH 16MHZ 44QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644P-A15MZ

• Package / Case: 44-VQFN Exposed Pad
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Speed: 16MHz
• Number Of I /o: 32
• Eeprom Size: 2K x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Program Memory Size: 64KB (64K x 8)
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Connectivity: I²C, SPI, UART/USART
• Core Size: 8-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

26.3
Table 26-2.
26.3.1
26.3.2
7674F–AVR–09/09
Factory
Calibration
Clock Characteristics
External Clock Drive Waveforms
External Clock Drive
Calibration Accuracy of Internal RC Oscillator
Figure 26-2. External Clock Drive Waveforms
Table 26-3.
Note:
Symbol
1/t
t
t
t
t
t
CHCX
CLCX
CLCH
CHCL
CLCL
t
CLCL
CLCL
Frequency
8.0 MHz
1. Values indicated represent typical data from design simulation.
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
2.7V - 5.5V
V
3V
CC
(1)
Min.
125
50
50
0
V
CC
=2.7-5.5V
Max.
1.6
1.6
8
2
ATmega164P/324P/644P
-40 C - 125 C
Temperature
25 C
Min.
62.5
25
25
0
V
CC
=4.5-5.5V
Max.
0.5
0.5
16
2
Calibration Accuracy
Units
±14%
MHz
±2%
ns
ns
ns
µs
µs
%
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