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MAX6467

更新时间： 2024-11-23 22:58:07
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美信 - MAXIM 微处理器复位电路监控
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Microprocessor Supervisory Reset Circuits with Edge-Triggered, One-Shot Manual Reset

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19-2523; Rev 0; 7/02  
Microprocessor Supervisory Reset Circuits  
with Edge-Triggered, One-Shot Manual Reset  
General Description  
Features  
The MAX6467/MAX6468 microprocessor (µP) supervi-  
sory circuits monitor single power-supply voltages from  
+1.8V to +5.0V and assert a reset if the supply voltage  
drops below its preset threshold. An edge-triggered,  
one-shot manual reset function ensures that the µP  
enters the reset mode for a fixed timeout period only,  
even in the event of a continuously asserted manual  
reset. The MAX6467/MAX6468 significantly improve  
system reliability compared to traditional manual reset  
supervisory circuits.  
ꢀ Precision Factory-Set Reset Threshold Voltages  
for +5.0V, +3.3V, +3.0V, +2.5V, and +1.8V Supplies  
ꢀ Edge-Triggered Manual Reset Input with One-  
Shot Pulsed Reset Output  
ꢀ Two Reset Timeout Period Options (150ms or  
1200ms min)  
ꢀ Immune to Short Voltage Transients  
ꢀ Low Supply Current (3µA at V  
= +1.8V)  
CC  
A variety of factory-trimmed threshold options accommo-  
date different supply voltages and tolerances, eliminating  
external components. The factory-set thresholds range  
from +1.575V to +4.625V to monitor +5.0V, +3.3V, +3.0V,  
+2.5V, and +1.8V supplies with various tolerances. Reset  
timeout periods of 150ms (min) and 1200ms (min) are  
available to accommodate different µP platforms.  
ꢀ RESET Valid to V  
= +1V  
CC  
ꢀ Active-Low Open-Drain and Push-Pull RESET  
Output Options  
ꢀ -40°C to +125°C Operating Temperature Range  
ꢀ Small 4-Pin SC70 and SOT143 Packages  
ꢀ No External Components Required  
A single, active-low RESET output asserts when V  
CC  
drops below its threshold or if the edge-triggered MR  
asserts low. RESET remains low for the reset timeout  
ꢀ Pin Compatible with MAX811, MAX6315,  
period after V  
rises above its threshold and for a fixed,  
CC  
MAX6384, and MAX6386  
one-shot timeout period after a manual reset input falling  
edge. RESET remains valid as long as V remains  
CC  
Ordering Information  
above +1V. Open-drain (MAX6467) and push-pull  
(MAX6468) output options provide additional flexibility in  
the system design.  
PART  
MAX6467XS_ _D_-T -40°C to +125°C  
MAX6467US_ _D_-T -40°C to +125°C  
MAX6468XS_ _D_-T -40°C to +125°C  
MAX6468US_ _D_-T -40°C to +125°C  
TEMP RANGE  
PIN-PACKAGE  
4 SC70-4  
4 SOT143-4  
4 SC70-4  
The MAX6467/MAX6468 are offered in the space-saving  
4-pin SOT143 package and the ultra-small 4-pin SC70  
package and are specified over the automotive (-40°C to  
+125°C) temperature range.  
4 SOT143-4  
Note: Insert reset threshold suffix (see Reset Threshold table)  
after XS or US. Insert reset timeout delay (see Reset Timeout  
Delay table) after D to complete the part number. Sample stock  
is generally held on standard versions only (see Standard  
Versions table). Standard versions have an order increment  
requirement of 2500 pieces. Nonstandard versions have an  
order increment requirement of 10,000 pieces. Contact factory  
for availability.  
Applications  
Cell Phones/PDAs  
Embedded Control Systems  
Industrial Equipment  
Automotive Products  
Portable/Battery-Powered Equipment  
Medical Devices  
Pin Configurations  
TOP VIEW  
DSL Modems  
GND  
1
2
4
3
V
CC  
MP3 Players  
MAX6467XS  
MAX6468XS  
GPS Systems  
MR  
RESET  
Digital Cameras  
SC70  
Pin Configurations continued at end of data sheet.  
Typical Operating Circuit appears at end of data sheet.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...9

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