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MAX6724UTRHD3-T

更新时间： 2024-11-05 23:51:27
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19页 304K
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Dual/Triple Ultra-Low-Voltage SOT23 µ.P Supervisory Circuits

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19-2325; Rev 2; 10/02  
Dual/Triple Ultra-Low-Voltage SOT23 µP  
Supervisory Circuits  
General Description  
Features  
o V 1 (primary supply) Reset Threshold Voltages  
The MAX6715–MAX6729 are ultra-low-voltage microproces-  
sor (µP) supervisory circuits designed to monitor two or three  
system power-supply voltages. These devices assert a sys-  
tem reset if any monitored supply falls below its factory-  
trimmed or adjustable threshold and maintain reset for a  
minimum timeout period after all supplies rise above their  
thresholds. The integrated dual/triple supervisory circuits sig-  
nificantly improve system reliability and reduce size com-  
pared to separate ICs or discrete components.  
CC  
from 1.58V to 4.63V  
o V 2 (secondary supply) Reset Threshold  
CC  
Voltages from 0.79V to 3.08V  
o Externally Adjustable RSTIN Threshold for  
Auxiliary/Triple-Voltage Monitoring  
(0.62V internal reference)  
o Watchdog Timer Option  
These devices monitor primary supply voltages (V 1) from  
CC  
35s (min) Long Startup Period  
1.12s (min) Normal Timeout Period  
1.8V to 5.0V and secondary supply voltages (V 2) from  
CC  
0.9V to 3.3V with factory-trimmed reset threshold voltage  
options (see Reset Voltage Threshold Suffix Guide). An  
externally adjustable RSTIN input option allows customers to  
monitor a third supply voltage down to 0.62V. These devices  
are guaranteed to be in the correct reset output logic state  
o Manual Reset Input Option  
o Power-Fail Input/Power-Fail Output Option  
(Push-Pull and Open-Drain Active-Low)  
when either V 1 or V 2 remains greater than 0.8V.  
CC  
CC  
o Guaranteed Reset Valid Down to V 1 or  
CC  
A variety of push-pull or open-drain reset outputs along with  
watchdog input, manual reset input, and power-fail input/out-  
put features are available (see Selector Guide). Select reset  
timeout periods from 1.1ms to 1120ms (min) (see Reset  
Timeout Period Suffix Guide). The MAX6715–MAX6729 are  
available in small 5, 6, and 8-pin SOT23 packages and oper-  
ate over the -40°C to +85°C temperature range.  
V
2 = 0.8V  
CC  
o Reset Output Logic Options  
o Immune to Short V Transients  
CC  
o Low Supply Current 14µA (typ) at 3.6V  
o Small 5, 6, and 8-Pin SOT23 Packages  
Ordering Information  
Applications  
Multivoltage Systems  
PART  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
6 SOT23-6  
6 SOT23-6  
5 SOT23-5  
5 SOT23-5  
6 SOT23-6  
6 SOT23-6  
Telecom/Networking Equipment  
Computers/Servers  
MAX6715UT_ _D_ -T  
MAX6716UT_ _D_ -T  
MAX6717UK_ _D_ -T  
MAX6718UK_ _D_ -T  
MAX6719UT_ _D_ -T  
MAX6720UT_ _D_ -T  
Portable/Battery-Operated Equipment  
Industrial Equipment  
Printer/Fax  
Set-Top Boxes  
Note: The first “_ _” are placeholders for the threshold voltage  
levels of the devices. Desired threshold levels are set by the part  
number suffix found in the Reset Voltage Threshold Suffix Guide.  
The “_” after the D is a placeholder for the reset timeout delay  
time. Desired delay time is set using the timeout period suffix  
found in the Reset Timeout Period Suffix Guide. For example the  
Typical Operating Circuit  
OUT2  
DC/DC  
UNREGULATED  
IN  
CONVERTER  
DC  
MAX6716UTLTD3-T is a dual-voltage supervisor V 1 = 4.625V,  
OUT1  
1.8V  
I/O  
0.9V  
CORE  
TH  
V 2 = 3.075V, and 210ms (typ) timeout period.  
TH  
V
1
CC  
V
2
CC  
SUPPLY SUPPLY  
R1  
R2  
RESET  
RST  
WDI  
PFO  
Ordering Information continued at end of data sheet.  
Pin Configurations appear at end of data sheet.  
Selector Guide appears at end of data sheet.  
µP  
RSTIN/PFI  
MR  
I/O  
NMI  
MAX67_ _  
PUSHBUTTON  
SWITCH  
________________________________________________________________ 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...19

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