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ATtiny88 bảng dữ liệu(PDF) 204 Page - ATMEL Corporation

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Giải thích chi tiết về linh kiện  8-bit Microcontroller with 4/8K Bytes In-System Programmable Flash
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ATtiny88 bảng dữ liệu(HTML) 204 Page - ATMEL Corporation

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204
8008C–AVR–03/09
ATtiny48/88
Note:
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 pre-
liminary, representing design targets, and will be updated after characterization of actual silicon.
21.5
System and Reset Characterizations
Note:
1. Values are guidelines, only
2. The Power-on Reset will not work unless the supply voltage has been below VPOT (falling)
Table 21-2.
External Clock Drive
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
Oscillator
Frequency
02
06
0
12
MHz
tCLCL
Clock Period
250
166
83
ns
tCHCX
High Time
120
80
40
ns
tCLCX
Low Time
120
80
40
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
22
2
%
Table 21-3.
Reset, Brown-out, and Internal Voltage Characteristics
(1)
Symbol
Parameter
Condition
Min
Typ
Max
Units
VPOT
Power-on Reset Threshold
Voltage (rising)
TA = -40 – 85°C1.5
V
Power-on Reset Threshold
Voltage (falling)(2)
T
A = -40 – 85°C1.2
V
VRST
RESET Pin Threshold
Voltage
0.2 V
CC
0.9V
CC
V
tRST
Minimum pulse width on
RESET Pin
V
CC = 1.8V
V
CC = 3V
VCC = 5V
2000
700
400
ns
VHYST
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
TA =25°C
40
70
µs
IBG
Internal bandgap reference
current consumption
VCC = 5V
T
A =25°C
15
µA



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