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ATtiny44 Datasheet(PDF) 177 Page - ATMEL Corporation

No. de pieza ATtiny44
Descripción Electrónicos  8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
PDF  236 Pages
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Fabricante Electrónico  ATMEL [ATMEL Corporation]
Página de inicio  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATtiny44 Datasheet(HTML) 177 Page - ATMEL Corporation

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177
8006H–AVR–10/09
ATtiny24/44/84
20.4.2
External Clock Drive
Figure 20-3. External Clock Drive Waveform
20.5
System and Reset Characteristics
Note:
1. Values are guidelines, only
VIL1
VIH1
Table 20-3.
External Clock Drive Characteristics
Symbol
Parameter
VCC = 1.8 - 5.5V
VCC = 2.7 - 5.5V
VCC = 4.5 - 5.5V
Units
Min.
Max.
Min.
Max.
Min.
Max.
1/tCLCL
Clock Frequency
0
4
0
10
0
20
MHz
tCLCL
Clock Period
250
100
50
ns
tCHCX
High Time
100
40
20
ns
tCLCX
Low Time
100
40
20
ns
tCLCH
Rise Time
2.0
1.6
0.5
μs
tCHCL
Fall Time
2.0
1.6
0.5
μs
Δt
CLCL
Change in period from one clock cycle to the next
2
2
2
%
Table 20-4.
Reset, Brown-out, and Internal Voltage Characteristics
Symbol
Parameter
Condition
Min
(1)
Typ
(1)
Max
(1)
Units
VRST
RESET Pin Threshold Voltage
0.2 VCC
0.9VCC
V
tRST
Minimum pulse width on RESET
Pin
V
CC = 1.8V
VCC = 3V
VCC = 5V
2000
700
400
ns
V
HYST
Brown-out Detector Hysteresis
50
mV
t
BOD
Min Pulse Width on
Brown-out Reset
2µs
VBG
Internal bandgap reference
voltage
V
CC = 5V
TA = 25°C
1.0
1.1
1.2
V
tBG
Internal bandgap reference
start-up time
V
CC = 5V
T
A = 25°C
40
70
µs
IBG
Internal bandgap reference
current consumption
VCC = 5V
T
A = 25°C
15
µA



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