ATMEGA644P-20PQ Atmel, ATMEGA644P-20PQ Datasheet - Page 331

• Manufacturer Part Number: ATMEGA644P-20PQ
• Description: MCU AVR 64K FLASH 20MHZ 40-PDIP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644P-20PQ

• 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): 2.7 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)
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

25.4
Table 25-6.
Notes:
Table 25-7.
Note:
25.5
Table 25-8.
8011O–AVR–07/10
Symbol
Symbol
V
V
t
V
INT
POT
t
t
V
t
I
RST
BOD
HYST
RST
BG
BG
BG
System and Reset Characteristics
1. Values are guidelines only.
2. The Power-on Reset will not work unless the supply voltage has been below V
1. V
External Interrupts Characteristics
(1)
tested down to V
a voltage where correct operation of the microcontroller is no longer guaranteed. The test is performed using
BODLEVEL = 101 for ATmega164P/324P/644P and BODLEVEL = 110 for ATmega164P/324P/644PV.
BODLEVEL 2:0 Fuses
BOT
Parameter
Minimum pulse width for asynchronous external interrupt
Reset, Brown-out and Internal Voltage Reference Characteristics
BODLEVEL Fuse Coding
Asynchronous External Interrupt Characteristics
Parameter
Power-on Reset Threshold Voltage (rising)
Power-on Reset Threshold Voltage (falling)
Minimum pulse width on RESET Pin
Brown-out Detector Hysteresis
Min Pulse Width on Brown-out Reset
Bandgap reference voltage
Bandgap reference start-up time
Bandgap reference current consumption
RESET Pin Threshold Voltage
may be below nominal minimum operating voltage for some devices. For devices where this is the case, the device is
111
110
101
100
011
010
001
000
CC
= V
BOT
during the production test. This guarantees that a Brown-Out Reset will occur before V
(1)
Min V
(2)
1.7
2.5
4.1
BOT
V
V
V
C C
C C
C C
= 2.7V, T
= 2.7V, T
= 2.7V, T
Condition
Typ V
A
A
A
= 25°C
= 25°C
= 25°C
1.8
2.7
4.3
ATmega164P/324P/644P
BOD Disabled
BOT
Condition
Reserved
POT
0.2V
(falling)
Min
0.7
0.6
1.0
CC
Min
Max V
Typ
1.0
0.9
1.1
50
40
10
2.0
2.9
4.5
2
BOT
Typ
50
0.9V
Max
1.4
1.3
2.5
1.2
70
Max
CC
CC
Units
Units
drops to
V
mV
Units
µA
µs
µs
µs
V
V
ns
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