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MAX16998AAUA+T

更新时间： 2024-02-18 02:07:14
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MAX16998AAUA+T 数据手册

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19-4000; Rev 1; 4/09  
High-Voltage Watchdog Timers with  
Adjustable Timeout Delay  
7/MAX1698  
General Description  
Features  
The MAX16997/MAX16998 are microprocessor (µP)  
supervisory circuits for high-input-voltage and low-qui-  
escent-current applications. These devices detect  
downstream circuit failures and provide switchover to  
redundant circuitry. See the Selector Guide for the dif-  
ferent versions of this product family.  
o Wide 5V to 40V Input Voltage Range  
o 18µA Quiescent Current (Typical at +125°C)  
o Capacitor-Adjustable Timeout Period for  
Watchdog and Reset  
o Windowed Watchdog Timer Options  
The MAX16997/MAX16998 family has four independent  
inputs for reset and watchdog functions. SWT and SRT  
inputs independently set the timeout periods of watch-  
dog and reset timers through external capacitors.  
RESETIN/EN monitor voltages at respective inputs. A  
resistive voltage-divider sets the reset threshold.  
(MAX16998B/D)  
o External Voltage Monitoring (RESETIN for the  
MAX16998A/B/D and EN for the MAX16997A)  
o Car Battery-Compatible EN Input  
o TTL- and CMOS-Compatible Open-Drain Outputs  
o 18V Maximum Open-Drain Reset Output Voltage  
o 28V Maximum Open-Drain Enable Output Voltage  
The MAX16998A/B/D generate two output signals,  
RESET and ENABLE. RESET asserts whenever  
RESETIN drops below its threshold voltage or when the  
watchdog timer detects a timing fault at WDI. Once  
asserted, and after all reset conditions are removed,  
o Power-On/Power-Off Reset Functionality  
RESET remains low for the reset timeout period, t  
,
RESET  
(MAX16998A/B/D Only)  
and then goes high. The MAX16997A generates one  
output signal (ENABLE) based on the voltage level at  
EN and the signal at WDI.  
o AECQ-100 Qualified  
o -40°C to +125°C Operating Temperature Range  
o Small (3mm x 3mm) µMAX Package  
o WDI Narrow Pulse Immunity  
The MAX16997A does not have a RESET output. The  
watchdog is disabled if the voltage at EN is below its  
threshold. The MAX16997A watchdog timer starts tim-  
ing when the voltage at EN becomes higher than the  
preset threshold voltage level. Each time EN rises  
above the preset threshold voltage, the initial watchdog  
timeout period is 8 times the normal watchdog timeout  
Ordering Information  
PART  
TEMP RANGE  
-40°C to +125°C  
-40°C to +125°C  
-40°C to +125°C  
-40°C to +125°C  
PIN-PACKAGE  
period (t ).  
WP  
MAX16997AAUA+  
MAX16998AAUA+  
MAX16998BAUA+  
MAX16998DAUA+  
8 µMAX  
The MAX16997/MAX16998 are available in 8-pin lead-  
®
free µMAX packages and are fully specified over the  
8 µMAX  
-40°C to +125°C automotive temperature range.  
8 µMAX  
8 µMAX  
Applications  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
Automotive  
Industrial  
Selector Guide  
WATCHDOG  
WINDOW SIZE (%)  
PART  
ENABLE  
RESET  
EN  
RESETIN  
MAX16997A  
MAX16998A  
MAX16998B  
MAX16998D  
100  
100  
50  
✓
✓
✓
✓
—
✓
✓
✓
✓
—
✓
✓
✓
—
—
—
75  
Pin Configurations appear at end of data sheet.  
µMAX is a registered trademark of Maxim Integrated Products, Inc.  
________________________________________________________________ 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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MAX16998AAUA+T 替代型号

型号 品牌 替代类型 描述 数据表
MAX16997AAUA/V+ MAXIM

完全替代

 Programmable Timer, 1 Timer(s), BICMOS, PDSO8, 3 X 3 MM, ROHS COMPLIANT, MO-187-AA, MICRO
MAX16998AAUA+ MAXIM

完全替代

 High-Voltage Watchdog Timers with Adjustable Timeout Delay

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