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MAX6446UK23L

更新时间： 2024-11-29 11:15:35
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美信 - MAXIM 复位电路
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13页 159K
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uP Reset Circuits with Long Manual Reset Setup Period

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MAX6446UK23L 数据手册

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19-2656; Rev 3; 6/10  
µP Reset Circuits with Long Manual Reset  
Setup Period  
3–MAX6452  
General Description  
Features  
o Single- or Dual-Supply Voltage Monitors  
o Precision Factory-Set Reset Thresholds from  
The MAX6443–MAX6452 low-current microprocessor  
reset circuits feature single or dual manual reset inputs  
with an extended setup period. Because of the extend-  
ed setup period, short switch closures (nuisance resets)  
are ignored.  
1.6V to 4.6V  
o Adjustable Threshold to Monitor Voltages Down  
to 0.63V (MAX6449–MAX6452)  
On all devices, the reset output asserts when any of the  
monitored supply voltages drops below its specified  
threshold. The reset output remains asserted for the  
reset timeout period (210ms typ) after all monitored  
supplies exceed their reset thresholds. The reset output  
is one-shot pulse asserted for the reset timeout period  
(140ms min) when selected manual reset input(s) are  
held low for an extended setup timeout period. These  
devices ignore manual reset transitions of less than the  
extended setup timeout period.  
o Single or Dual Manual Reset Inputs with Extended  
Setup Period  
o Optional Short Setup Time Manual Reset Input  
(MAX6447/MAX6448 and MAX6451/MAX6452)  
o Immune to Short Voltage Transients  
o Low 6µA Supply Current  
o Guaranteed Valid Reset Down to V  
= 1.0V  
CC  
The MAX6443–MAX6448 are single fixed-voltage µP  
supervisors. The MAX6443/MAX6444 have a single  
extended manual reset input. The MAX6445/MAX6446  
have two extended manual reset inputs. The MAX6447/  
MAX6448 have one extended and one immediate manual  
reset input.  
o Active-Low RESET (Push-Pull or Open-Drain)  
Outputs  
o 140ms (min) Reset Timeout Period  
o Small SOT143 and SOT23 Packages  
Ordering Information  
The MAX6449–MAX6452 have one fixed-threshold µP  
supervisor and one adjustable-threshold µP supervisor.  
The MAX6449/MAX6450 have two delayed manual  
reset inputs. The MAX6451/MAX6452 have one delayed  
and one immediate manual reset input.  
PART  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
4 SOT143  
MAX6443US_ _ _-T  
MAX6444US_ _ _-T  
4 SOT143  
Note: The first “_ _ ” is a placeholder for the threshold voltage  
level of the devices. A desired threshold level is set by the two-  
number suffix found in Table 1. The third "_" is a placeholder  
for the manual reset setup period of the devices. A desired  
setup period is set by the letter suffix found in Table 2. All  
devices are available in tape-and-reel only. There is a 2500-  
piece minimum order increment for standard versions (Table  
2). Sample stock is typically held on standard versions only.  
Nonstandard versions require a minimum order increment of  
10,000 pieces. Contact factory for availability.  
The MAX6443–MAX6452 have an active-low RESET  
with push-pull or open-drain output logic options. These  
devices, offered in small SOT packages, are fully guar-  
anteed over the extended temperature range (-40°C to  
+85°C).  
Applications  
Set-Top Boxes  
Consumer Electronics  
DVD Players  
Devices are available in both leaded and lead-free packaging.  
Specify lead-free by replacing “-T” with “+T” when ordering.  
Cable/DSL Modems  
MP3 Players  
Pin Configurations  
TOP VIEW  
Industrial Equipment  
Automotive  
4
3
1
2
GND  
V
CC  
Medical Devices  
MAX6443  
MAX6444  
RESET  
MR1  
SOT143  
Pin Configurations continued at end of data sheet.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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