ATtiny28L Atmel Corporation, ATtiny28L Datasheet - Page 56

• Manufacturer Part Number: ATtiny28L
• Manufacturer: Atmel Corporation

Specifications of ATtiny28L

• Flash (kbytes): 2 Kbytes
• Pin Count: 28
• Max. Operating Frequency: 4 MHz
• Cpu: 8-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 11
• Ext Interrupts: 10
• Usb Speed: No
• Usb Interface: No
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 0.03
• Self Program Memory: NO
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 1
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

External Clock Drive Waveforms
Figure 41. External Clock
External Clock Drive
Table 25. External RC Oscillator, Typical Frequencies
56
Symbol
1/t
t
t
t
t
t
CHCX
CLCH
CHCL
CLCL
CLCX
CLCL
ATtiny28L/V
Parameter
Oscillator Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
R [kΩ]
100.0
VIL1
31.5
6.5
VIH1
:
Note:
V
833.0
333.0
333.0
R should be in the range 3 - 100 kΩ, and C should be at least 20 pF.
Min
CC
0.0
= 1.8V to 2.7V
C [pF]
70.0
20.0
20.0
Max
1.2
1.6
1.6
V
250.0
100.0
100.0
CC
Min
0.0
= 2.7V to 4.0V
Max
4.0
1.6
1.6
V
250.0
100.0
100.0
100.0 kHz
Min
CC
0.0
1.0 MHz
4.0 MHz
= 4.0V to 5.5V
f
Max
4.0
0.5
0.5
1062F–AVR–07/06
Units
MHz
ns
ns
ns
µs
µs