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MAX6323_10

更新时间： 2024-09-13 01:23:11
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uP Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset

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MAX6323_10 数据手册

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19-1838; Rev ꢀ; ꢀ/10  
µP Supervisory Circuits with Windowed  
(Min/Max) Watchdog and Manual Reset  
/MAX6324  
General Description  
Features  
The MAX6323/MAX6324 microprocessor (µP) supervi-  
sory circuits monitor power supplies and µP activity in  
digital systems. A watchdog timer looks for activity out-  
side an expected window of operation. Six laser-  
trimmed reset thresholds are available with 2.ꢀ5  
accuracy from +2.32V to +4.63V. Valid RESET output is  
o Min/Max (Windowed) Watchdog,  
8 Factory-Trimmed Timing Options  
o Pulsed Open-Drain, Active-Low Watchdog Output  
o Power-On Reset  
o Precision Monitoring of +2.5V, +3.0V, +3.3V,  
guaranteed down to V  
= +1.2V.  
CC  
and +5.0V Power Supplies  
The RESET output is either push-pull (MAX6323) or  
open-drain (MAX6324). RESET is asserted low when  
o Open-Drain or Push-Pull RESET Outputs  
o Low-Power Operation (23µA typ)  
o Debounced Manual Reset Input  
V
falls below the reset threshold, or when the manual  
CC  
reset input (MR) is asserted low. RESET remains assert-  
ed for at least 100ms after V rises above the reset  
CC  
threshold and MR is deasserted.  
o Guaranteed Reset Valid to V  
= +1.2V  
CC  
The watchdog pulse output (WDPO) utilizes an open-  
drain configuration. It can be triggered either by a fast  
timeout fault (watchdog input pulses are too close to  
each other) or a slow timeout fault (no watchdog input  
pulse is observed within the timeout period). The  
watchdog timeout is measured from the last falling  
edge of watchdog input (WDI) with a minimum pulse  
width of 300ns. WDPO is asserted for 1ms when a fault  
is observed. Eight laser-trimmed timeout periods are  
available.  
Ordering Information  
TEMP  
PIN-  
RESET  
PART  
RANGE  
PACKAGE OUTPUT  
MAX6323_UT_ _-T  
-40°C to +12ꢀ°C 6 SOT23 Push-Pull  
Ordering Information continued at end of data sheet.  
*These devices are factory trimmed to one of eight watchdog-  
timeout windows and one of six reset voltage thresholds. Insert  
the letter corresponding to the desired watchdog-timeout window  
(A, B, C, D, E, F, G, or H) into the blank following the number  
6323 or 6324 (see Watchdog Timeout table). Insert the two-digit  
code (46, 44, 31, 29, 26, or 23) after the letters UT for the desired  
nominal reset threshold (see Reset Threshold Range table at end  
of data sheet).  
The MAX6323/MAX6324 are offered in a 6-pin SOT23  
package and operate over the extended temperature  
range (-40°C to +12ꢀ°C).  
Applications  
/V denotes an automotive qualified part.  
Devices are available in both leaded and lead-free packaging.  
Specify lead-free by replacing “-T” with “+T” when ordering.  
Note: There are eight standard versions of each device available  
(see Standard Versions table). Sample stock is generally held on  
standard versions only. Standard versions have an order incre-  
ment requirement of 2ꢀ00 pieces. Nonstandard versions have an  
order increment requirement of 10,000 pieces. Contact factory for  
availability of nonstandard versions.  
Automotive  
Industrial  
Medical  
Embedded Control Systems  
Pin Configuration  
Watchdog Timeout  
WATCHDOG TIMEOUT*  
TOP VIEW  
FAST  
SLOW  
UNITS  
SUFFIX  
MAX  
1.ꢀ  
1ꢀ  
UNITS  
ms  
MIN  
10  
MR  
GND  
WDI  
1
2
3
6
5
4
RESET  
WDPO  
A
B
C
D
E
ms  
100  
300  
10  
ms  
s
MAX6323  
MAX6324  
1ꢀ  
ms  
1ꢀ  
ms  
V
CC  
1ꢀ  
ms  
60  
F
23  
ms  
47  
ms  
s
SOT23  
G
H
39  
719  
ms  
ms  
82  
1.3  
Typical Operating Circuit appears at end of data sheet.  
*See Figure 1 for operation.  
________________________________________________________________ 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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