ATMEGA48A-PU Atmel, ATMEGA48A-PU Datasheet - Page 322

• Manufacturer Part Number: ATMEGA48A-PU
• Description: IC MCU AVR 4K FLASH 28PDIP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA48A-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: 23
• Program Memory Size: 4KB (2K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 256 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 6x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-DIP (0.300", 7.62mm)
• Controller Family/series: Atmega
• No. Of I/o's: 23
• Eeprom Memory Size: 256Byte
• Ram Memory Size: 512Byte
• Cpu Speed: 20MHz
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

28.4
28.4.1
Table 28-10. Calibration Accuracy of Internal RC Oscillator
28.4.2
28.4.3
Table 28-11. External Clock Drive
Note:
8271C–AVR–08/10
Factory
Calibration
User
Calibration
Symbol
1/t
t
t
t
t
t
Δ
CLCL
CHCX
CLCX
CLCH
CHCL
t
CLCL
CLCL
Clock Characteristics
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 preliminary values representing design targets, and will be
updated after characterization of actual silicon.
Calibrated Internal RC Oscillator Accuracy
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 28-2. External Clock Drive Waveforms
ATmega48A/48PA/88A/88PA/168A/168PA/328/328
7.3 - 8.1 MHz
Frequency
8.0 MHz
V
IL1
Min.
250
100
100
V
0
V
CC
IH1
= 1.8 - 5.5V
Max.
1.8V - 5.5V
2.0
2.0
4
2
V
3V
CC
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.
V
50
20
20
0
CC
= 4.5 - 5.5V
Calibration Accuracy
Max.
0.5
0.5
20
2
±10%
±1%
Units
MHz
ns
ns
ns
μs
μs
%
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