ADM809MART データシートの表示（PDF） - Analog Devices
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ADM809MART Datasheet PDF : 6 Pages
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a
Microprocessor
Supervisory Circuit in 3-Pin SOT-23
ADM809/ADM810
FEATURES
Superior Upgrade for MAX809/MAX810
Specified Over Temperature
Low Power Consumption (17 A)
Precision Voltage Monitor: +3 V, +3.3 V, +5 V Options
Reset Assertion Down to 1 V VCC
140 ms min Power-On Reset
Logic Low RESET Output (ADM809)
Logic High RESET Output (ADM810)
APPLICATIONS
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Automotive Systems
FUNCTIONAL BLOCK DIAGRAM
ADM809/ADM810
VCC
VREF
RESET
GENERATOR
240ms
RESET
(RESET)
GND
GENERAL DESCRIPTION
The ADM809/ADM810 supervisory circuits monitor the
power supply voltage in microprocessor systems. They pro-
vide a reset output during power-up, power-down and
brownout conditions. On power-up, an internal timer holds
reset asserted for 240 ms. This holds the microprocessor in a
reset state until conditions have stabilized. The RESET
output remains operational with VCC as low as 1 V. The
ADM809 provides an active low reset signal (RESET) while
the ADM810 provides an active high signal (RESET) output.
Six reset threshold voltage options are available suitable for
monitoring a variety of supply voltages. Refer to Table I.
The reset comparator features built-in glitch immunity,
making it immune to fast transients on VCC.
The ADM809/ADM810 consumes only 17 µA, making it
suitable for low power portable equipment. It is packaged in
a 3-pin SOT-23 package.
VCC
VCC
ADM809 RESET
VCC
RESET
µP
INPUT SYSTEM
GND
GND
Figure 1. Typical Operating Circuit
REV. 0
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© Analog Devices, Inc., 1997
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