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MAX6391KA23+

更新时间： 2024-10-03 13:10:51
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美信 - MAXIM 监控
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19-2210; Rev 1; 10/02  
Dual-Voltage µP Supervisory Circuits  
with Sequenced Reset Outputs  
General Description  
Features  
The MAX6391/MAX6392 microprocessor (µP) supervisory  
circuits provide sequenced logic reset outputs for multi-  
component or dual-voltage systems. Each device can  
monitor two supply voltages and time-sequence two reset  
outputs to control the order in which system components  
are turned on and off. The MAX6391/MAX6392 increase  
system reliability and reduce circuit complexity and cost  
compared to separate ICs or discrete components.  
o Preset V  
Reset Threshold Voltages from 1.58V  
CC  
to 4.63V (master supply)  
o Customer-Adjustable RESET IN2 to Monitor  
Voltages Down to 625mV (secondary supply)  
o Fixed (140ms min) RESET1 Timeout  
o Fixed (140ms min) or Customer-Adjustable  
RESET2 Timeout Period  
The MAX6391/MAX6392 monitor V  
as the master  
CC  
reset supply. Both RESET1 and RESET2 are asserted  
whenever V drops below the selected factory-fixed  
o Guaranteed Reset Valid to V  
= 1V  
CC  
CC  
o Active-Low Open-Drain Outputs or Push-  
reset threshold voltage. RESET1 remains asserted as  
long as V is below the threshold and deasserts  
Pull/Open-Drain Combination  
CC  
140ms (min) after V  
exceeds the thresholds.  
CC  
o Internal Open-Drain Pullup Resistors (for external  
RESET IN2 is monitored as the secondary reset supply  
and is adjustable with an external resistive-divider net-  
V
voltage connections)  
OH  
o Manual Reset Input (MAX6392 only)  
o Immune to Short Negative V Transients  
work. RESET2 is asserted whenever either V  
or  
CC  
RESET IN2 is below the selected thresholds. RESET2  
CC  
remains asserted 140ms (min) or a capacitor-  
o 15µA Typical Supply Current  
o Few External Components  
o Small 8-Pin SOT23 Package  
adjustable time period after V  
and RESET IN2  
CC  
exceed their thresholds. RESET2 is always deasserted  
after RESET1 during system power-up and is always  
asserted before RESET1 during power-down.  
The MAX6391 includes two internal pullup resistors for  
RESET1 and RESET2 (the open-drain outputs can be  
externally connected to the desired pullup voltages).  
The MAX6392 includes an active-low manual reset  
input (MR) that asserts both RESET1 (push-pull) and  
RESET2 (open drain).  
Ordering Information  
PART*  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
SOT23-8  
MAX6391KA_ _-T  
MAX6392KA_ _-T  
SOT23-8  
The MAX6391/MAX6392 are available in small 8-pin  
SOT23 packages and are specified over the -40°C to  
+85°C extended temperature range.  
*Insert the desired suffix (see Selector Guide) into the blanks to  
complete the part number. The MAX6391/MAX6392 require a  
2.5k minimum order increment and are available in tape-and-  
reel only. Samples are typically available for standard versions  
(see Selector Guide for standard versions). Contact factory for  
availability.  
Applications  
Computers  
Controllers  
Pin Configurations  
Critical µP Power Monitoring  
Set-Top Boxes  
TOP VIEW  
Printers  
RESET IN2  
1
2
3
4
8
7
6
5
R1  
Servers/Workstations  
Industrial Equipment  
Multivoltage Monitoring  
V
CC  
RESET1  
R2  
MAX6391  
CSRT  
GND  
RESET2  
SOT23-8  
Typical Operating Circuit appears at end of data sheet.  
Pin Configurations continued 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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