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MAX705ESA-T 参数 Datasheet PDF下载

MAX705ESA-T图片预览
型号: MAX705ESA-T
PDF下载: 下载PDF文件 查看货源
内容描述: 低成本, MUP监控电路 [Low-Cost, muP Supervisory Circuits]
分类和应用: 电源电路电源管理电路光电二极管监控
文件页数/大小: 12 页 / 229 K
品牌: MAXIM [ MAXIM INTEGRATED PRODUCTS ]
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MAX705–MAX708/MAX813L
Low-Cost, µP Supervisory Circuits
+12V
+5V
1MΩ
1%
V
CC
RESET
TO
µP
MAX70_
RESET
R1
130kΩ
1%
PFI
MAX70_
MR
PFO
GND
PARAMETER
+12V Reset
Threshold at +25°C
MIN
10.67
TYP
10.87
MAX
11.50
UNIT
V
Figure 5. RESET Valid to Ground Circuit
Figure 6. Monitoring Both +5V and +12V
+5V
V
CC
R1
MR
100kΩ
BUFFERED RESET TO OTHER SYSTEM COMPONENTS
MAX70_
PFI
PFO
100kΩ
2N3904
V
CC
V
CC
MAX70_
4.7kΩ
R2
GND
RESET
TO
µP
RESET
RESET
µP
V-
+5V
MR
0V
+5V
PFO
0V
V-
5
1.25
R1
V
TRIP
0V
GND
GND
Figure 8. Interfacing to µPs with Bidirectional Reset I/O
=
1.25
VTRIP
R2
, VTRIP
<
0
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 4.7kΩ
resistor between the
RESET
output and the µP reset I/O,
as in Figure 8. Buffer the
RESET
output to other system
components.
Maxim Integrated
Figure 7. Monitoring a Negative Voltage
8