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MAX803REXR-T

更新时间: 2024-11-15 22:24:11
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美信 - MAXIM 微处理器复位电路
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8页 137K
描述
3-Pin Microprocessor Reset Circuits

MAX803REXR-T 数据手册

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19-0344; Rev 4; 12/99  
3-Pin Microprocessor Reset Circuits  
General Description  
____________________________Features  
Precision Monitoring of +2.5V, +3V, +3.3V, and  
The MAX803/MAX809/MAX810 are microprocessor (µP)  
supervisory circuits used to monitor the power supplies  
in µP and digital systems. They provide excellent circuit  
reliability and low cost by eliminating external compo-  
nents and adjustments when used with +5V, +3.3V,  
+3.0V, or +2.5V-powered circuits.  
+5V Power-Supply Voltages  
Fully Specified Over Temperature  
Available in Three Output Configurations  
Open-Drain RESET Output (MAX803)  
Push-Pull RESET Output (MAX809)  
Push-Pull RESET Output (MAX810)  
140ms min Power-On Reset Pulse Width  
12µA Supply Current  
Guaranteed Reset Valid to VCC = +1V  
Power Supply Transient Immunity  
No External Components  
These circuits perform a single function: they assert a  
reset signal whenever the V  
supply voltage declines  
CC  
below a preset threshold, keeping it asserted for at  
least 140ms after V has risen above the reset thresh-  
CC  
old. Reset thresholds suitable for operation with a vari-  
ety of supply voltages are available.  
The MAX803 has an open-drain output stage, while the  
MAX809/MAX810 have push-pull outputs. The  
MAX803’s open-drain RESET output requires a pull-up  
resistor that can be connected to a voltage higher than  
3-Pin SC70 and SOT23 Packages  
Ordering Information  
V
CC  
. The MAX803/MAX809 have an active-low RESET  
PART  
TEMP. RANGE  
-40°C to +105°C  
-40°C to +105°C  
-40°C to +105°C  
-40°C to +105°C  
-40°C to +105°C  
-40°C to +105°C  
-40°C to +105°C  
-40°C to +105°C  
-40°C to +105°C  
-40°C to +105°C  
PIN-PACKAGE  
3 SC70-3  
output, while the MAX810 has an active-high RESET  
output. The reset comparator is designed to ignore fast  
MAX803_EXR-T  
MAX803_EXR-T10  
MAX809_EXR-T  
MAX809_EXR-T10  
MAX809_EUR-T  
MAX809_EUR-T10  
MAX810_EXR-T  
MAX810_EXR-T10  
MAX810_EUR-T  
MAX810_EUR-T10  
transients on V , and the outputs are guaranteed to  
CC  
3 SC70-3  
be in the correct logic state for V  
down to 1V.  
CC  
3 SC70-3  
Low supply current makes the MAX803/MAX809/  
MAX810 ideal for use in portable equipment. The  
MAX803 is available in a 3-pin SC70 package, and the  
MAX809/MAX810 are available in 3-pin SC70 or SOT23  
packages.  
3 SC70-3  
3 SOT23-3  
3 SOT23-3  
3 SC70-3  
3 SC70-3  
Applications  
3 SOT23-3  
3 SOT23-3  
Computers  
Controllers  
Note: These parts are offered in 2.5k or 10k reels, and must be  
ordered in 2.5k or 10k increments. Order MAX803_EXR-T for  
2.5k reels and MAX803_EXR-T10 for 10k reels. Insert the  
desired suffix letter from the Selector Guide into the blank to  
complete the part number. All versions of these products may  
not be available at the time of announcement. Contact factory for  
availability.  
Intelligent Instruments  
Critical µP and µC Power Monitoring  
Portable/Battery-Powered Equipment  
Automotive  
Pin Configuration  
Typical Operating Circuit  
TOP VIEW  
V
CC  
1
2
GND  
V
V
CC  
CC  
R
*
PULL-UP  
MAX803  
MAX809  
MAX810  
MAX803  
MAX809  
µP  
V
CC  
3
RESET  
INPUT  
RESET  
RESET (RESET)  
GND  
GND  
SC70-3/SOT23-3  
( ) ARE FOR MAX810.  
MAX803 AVAILABLE IN SC70-3 ONLY.  
*MAX803 ONLY  
________________________________________________________________ Maxim Integrated Products  
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.  
For small orders, phone 1-800-835-8769.  

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