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MAX708C/D Folha de dados(PDF) 8 Page - Maxim Integrated Products

Nome de Peças MAX708C/D
Descrição Electrónicos  Low-Cost, Supervisory Circuits
PDF  12 Pages
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Fabricante Electrônico  MAXIM [Maxim Integrated Products]
Página de início  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX708C/D Folha de dados(HTML) 8 Page - Maxim Integrated Products

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MAX705–MAX708/MAX813L
Low-Cost, µP Supervisory Circuits
8
Maxim Integrated
Interfacing to µPs with
Bidirectional Reset Pins
µPs with bidirectional reset pins, such as the Motorola
68HC11 series, can contend with the MAX705-MAX708
RESET output. If, for example, the RESET output is driven
high and the µP wants to pull it low, indeterminate logic
levels may result. To correct this, connect a 4.7k
Ω
resistor between the RESET output and the µP reset I/O,
as in Figure 8. Buffer the RESET output to other system
components.
MAX70_
RESET
R2
R1
+5V
V-
VCC
PFI
GND
MR
PFO
TO
µP
100k
Ω
100k
Ω
2N3904
MR
PFO
+5V
0V
+5V
0V
VTRIP
0V
V-
Figure 7. Monitoring a Negative Voltage
MAX70_
BUFFERED RESET TO OTHER SYSTEM COMPONENTS
4.7k
Ω
VCC
GND
RESET
VCC
GND
RESET
µP
Figure 8. Interfacing to µPs with Bidirectional Reset I/O
5
1.25
R1
1.25
VTRIP
R2
,VTRIP
0
−
=
−
<
MAX70_
RESET
R1
Figure 5. RESET Valid to Ground Circuit
MAX70_
RESET
130k
Ω
1%
PARAMETER
MIN
TYP
MAX
UNIT
+12V Reset
Threshold at +25
°C
10.67
10.87
11.50
V
1M
Ω
1%
+5V
+12V
VCC
PFI
GND
MR
PFO
TO
µP
Figure 6. Monitoring Both +5V and +12V



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