ATMEGA644A-PU Atmel, ATMEGA644A-PU Datasheet - Page 334
![IC MCU AVR 64K FLASH 40PDIP](/photos/6/70/67049/453-40-dip_sml.jpg)
ATMEGA644A-PU
Manufacturer Part Number
ATMEGA644A-PU
Description
IC MCU AVR 64K FLASH 40PDIP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644A-PU
Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
32
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
40-DIP (0.600", 15.24mm)
Processor Series
ATmega
Core
AVR
Data Bus Width
8 bit
Data Ram Size
4 KB
Interface Type
JTAG, TWI, SPI, USART
Maximum Clock Frequency
20 MHz
Number Of Programmable I/os
32
Number Of Timers
3
Operating Supply Voltage
3.3 V
Maximum Operating Temperature
+ 85 C
Mounting Style
Through Hole
Minimum Operating Temperature
- 40 C
Operating Temperature Range
- 40 C to + 85 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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27.3
Table 27-10. Calibration Accuracy of Internal RC Oscillator
Notes:
27.3.1
27.3.2
Table 27-11. External Clock Drive
8272A–AVR–01/10
Factory
Calibration
User
Calibration
Symbol
1/t
t
t
t
t
t
Δ
CLCL
CHCX
CLCX
CLCH
CHCL
t
CLCL
CLCL
Clock Characteristics
1. Voltage range for ATmega164A/164PA/324A/324PA/644A/644PA/1284/1284P.
External Clock Drive Waveforms
External Clock Drive
Parameter
Oscillator Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
Change in period from one
clock cycle to the next
Figure 27-2. External Clock Drive Waveforms
164A/164PA/324A/324PA/644A/644PA/1284/1284P
7.3 - 8.1 MHz
Frequency
8.0 MHz
V
Min.
IL1
250
100
100
V
0
CC
V
IH1
=1.8 - 5.5V
1.8V - 5.5V
Max.
2.0
2.0
4
2
V
3V
CC
(1)
Min.
100
40
40
V
0
CC
=2.7 - 5.5V
Max.
Temperature
-40°C - 85°C
1.6
1.6
10
2
25°C
Min.
50
20
20
V
0
CC
=4.5 - 5.5V
Calibration Accuracy
Max.
0.5
0.5
20
2
±10%
±1%
Units
MHz
ns
ns
ns
μs
μs
%
334
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