MAX16997
High-Voltage Watchdog Timers with Adjustable Timeout Delay
Highest Input Voltage Watchdog Consumes Only 18µA Supply Current
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Overview
Features and Benefits
- Wide 5V to 40V Input Voltage Range
- 18µA Quiescent Current (Typical at +125°C)
- Capacitor-Adjustable Timeout Period for Watchdog and Reset
- Windowed Watchdog Timer Options (MAX16998B/D)
- External Voltage Monitoring (RESETIN for the MAX16998A/B/D and EN for the MAX16997A)
- Car Battery-Compatible EN Input
- TTL- and CMOS-Compatible Open-Drain Outputs
- 18V Maximum Open-Drain Reset Output Voltage
- 28V Maximum Open-Drain Enable Output Voltage
- Power-On/Power-Off Reset Functionality (MAX16998A/B/D Only)
- AEC-Q100 Qualified
- -40°C to +125°C Operating Temperature Range
- Small (3mm x 3mm) µMAX Package
- WDI Narrow Pulse Immunity
Product Details
The MAX16997/MAX16998 are microprocessor (µP) supervisory circuits for high-input-voltage and low-quiescent-current applications. These devices detect downstream circuit failures and provide switchover to redundant circuitry. See the Selector Guide in the full data sheet for the different versions of this product family.
The MAX16997/MAX16998 family has four independent inputs for reset and watchdog functions. SWT and SRT inputs independently set the timeout periods of watchdog and reset timers through external capacitors. RESETIN/EN monitor voltages at respective inputs. A resistive voltage-divider sets the reset threshold.
The MAX16998A/B/D generate two output signals, active-low RESET and active-low ENABLE. Active-low 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, active-low RESET remains low for the reset timeout period, tRESET, and then goes high. The MAX16997A generates one output signal (active-low ENABLE) based on the voltage level at EN and the signal at WDI.<.p>
The MAX16997A does not have a active-low RESET output. The watchdog is disabled if the voltage at EN is below its threshold. The MAX16997A watchdog timer starts timing 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 period (tWP).
The MAX16997/MAX16998 are available in 8-pin lead-free µMAX® packages and are fully specified over the -40°C to +125°C automotive temperature range.
Applications
- Automotive
- Industrial
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| MAX16997AAUA+ | Material Declaration | Reliability Data | Micro-MAX, Thin Shrink Small-Outline | |
| MAX16997AAUA+T | Material Declaration | Reliability Data | Micro-MAX, Thin Shrink Small-Outline | |
| Wafer Fabrication Data | MAX16997 Reliability Data |
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