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PCIF0 Folha de dados(PDF) 258 Page - ATMEL Corporation

Nome de Peças PCIF0
Descrição Electrónicos  High Performance, Low Power Atmel AVR 8-bit Microcontroller Advanced RISC Architecture
PDF  294 Pages
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Fabricante Electrônico  ATMEL [ATMEL Corporation]
Página de início  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

PCIF0 Folha de dados(HTML) 258 Page - ATMEL Corporation

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258
9219A–RFID–01/11
Atmel ATA5505 [Preliminary]
23.4.3
External Clock Drive
23.5
RESET Characteristics
Note:
1. Before rising, the supply has to be between VPORMIN and VPORMAX to ensure a Reset.
Table 23-2.
External Clock Drive
Symbol
Parameter
VCC = 2.7 - 5.5V
VCC = 4.5 - 5.5V
Units
Min.
Max.
Min.
Max.
1/t
CLCL
Oscillator Frequency
0
8
0
16
MHz
tCLCL
Clock Period
125
62.5
ns
t
CHCX
High Time
50
25
ns
t
CLCX
Low Time
50
25
ns
tCLCH
Rise Time
1.6
0.5
ms
t
CHCL
Fall Time
1.6
0.5
ms
Δt
CLCL
Change in period from one clock
cycle to the next
22
%
Table 23-3.
External Reset Characteristics
Symbol
Parameter
Condition
Min
Typ
Max
Units
V
RST
RESET Pin Threshold
Voltage
V
CC = 5V
0.1 V
CC
0.9 V
CC
V
tRST
Minimum pulse width on
RESET Pin
VCC = 5V
2.5
µs
VBG
Bandgap reference voltage
VCC = 2.7V,
T
A =25°C
1.0
1.1
1.2
V
t
BG
Bandgap reference start-up
time
VCC = 2.7V,
TA =25°C
40
70
µs
IBG
Bandgap reference current
consumption
V
CC = 2.7V,
TA =25°C
15
µA
Table 23-4.
Power On Reset Characteristics
Symbol
Parameter
Min
Typ
Max
Units
VPOT
Power-on Reset Threshold Voltage (rising)
1.4
V
Power-on Reset Threshold Voltage (falling)(1)
1.0
1.3
1.6
V
VPORMAX
VCC Max. start voltage to ensure internal
Power-on Reset signal
0.4
V
VPORMIN
VCC Min. start voltage to ensure internal
Power-on Reset signal
–0.1
V
VCCRR
VCC Rise Rate to ensure Power-on Reset
0.01
V/ms
VRST
RESET Pin Threshold Voltage
0.1 VCC
0.9
V
CC
V



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