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ADM1817-20ART-RL7 数据表(PDF) 7 Page - Analog Devices

部件名 ADM1817-20ART-RL7
功能描述  Microprocessor Reset Circuits
Download  16 Pages
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

ADM1817-20ART-RL7 数据表(HTML) 7 Page - Analog Devices

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ADM1810 to ADM1813/ADM1815 to ADM1818
Rev. E | Page 7 of 16
THEORY OF OPERATION
TIMING DIAGRAMS FOR ALL DEVICES
The following two timing diagrams are valid for ADM1810,
ADM1811, ADM1812, ADM1813, ADM1815, ADM1816,
ADM1817, and ADM1818.
VCC
VCC TRIP POINT (MAX)
VCC TRIP POINT (MIN)
VOL
VCC TRIP POINT
VCC TO RESET
DELAY
RST
Figure 9. Power-Down Timing Diagram
VCC
VCC TRIP POINT (MAX)
RESET ACTIVE TIMEOUT
VCC TRIP POINT (MIN)
VCC TRIP POINT
RST
Figure 10. Power-Up Timing Diagram
ADM1813 AND ADM1818
The ADM1813 and ADM1818 are low cost voltage monitoring
devices featuring an open-drain output and optional push-button
reset function.
ADM1813/
ADM1818
VCC
GND
RST
VCC
MICRO-
PROCESSOR
RESET
Figure 11. ADM1813/ADM1818 Typical Application
An optional push-button reset switch can be connected between
RST and ground. Pressing this switch pulls the reset output low. If
the push-button reset button pulls the RST output low for a period
greater than 1 μs when the reset button releases the RST line to
float high, then the RST line stays low for another 150 ms typical.
VOLTAGE
INPUT HIGH
PUSH-BUTTON TIME
RESET TIMEOUT
VOLTAGE
INPUT LOW
Figure 12. Push-Button Reset Timing Diagram
The ADM1818 range has 2.88 V and 2.55 V (typical) trip point
options that allow the user to monitor 3.3 V and 3 V supplies.
For 5 V monitoring requirements, the ADM1813 range has 4.62 V
and 4.35 V (typical) trip point options.
ADM1810, ADM1812, ADM1815, AND ADM1817
The ADM1812 is a 5 V supply monitor with an active high push-
pull output and trip point options of 4.62 V and 4.35 V typical.
The ADM1810 is similar to the ADM1812, except that the
ADM1810 has an active low push-pull output stage. The ADM1817
is suitable for monitoring 3.3 V, 3 V, and 2.5 V supplies, with an
active high push-pull output and trip point options of 3.06 V,
2.88 V, 2.55 V, 2.31 V, and 2.18 V typical. The ADM1815 is similar
to the ADM1817, except that the ADM1815 has an active low
push-pull output stage.
The ADM1810/ADM1812/ADM1815/ADM1817 can connect
directly to most microprocessor reset inputs without the need for
external components.
ADM1810/
ADM1812/
ADM1815/
ADM1817
VCC
GND
RST/RST
VCC
MICRO-
PROCESSOR
RESET
Figure 13. ADM1810/ADM1812/ADM1815/ADM1817 Typical Application
ADM1811 AND ADM1816
The ADM1811 is a 5 V supply monitor with an active low open-
drain output and trip point options of 4.62 V and 4.35 V typical.
The ADM1816 also has an active low open-drain output but is
suitable for monitoring lower voltage supplies of 3.3 V, 3 V,
and 2.5 V.
ADM1811/
ADM1816
VCC
GND
RST
VCC
MICRO-
PROCESSOR
RESET
Figure 14. ADM1811/ADM1816 Typical Application


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