MAX16997AAUA+ by Analog Devices

High-Voltage Watchdog Timers with Adjustable Timeout Delay


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.

Where to Buy

Prices starting from US$1.55

Distributor Stock
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Farnell
from US$1.55
1,280
in stock
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Newark Electronics
from US$1.89
1,280
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element14
from US$1.65
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Features

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

Specifications

Watchdog Feature Input (WDI)
Watchdog Timeout Adjustable
Watchdog Output Open-Drain
ICC (µA) (max) 60
Package/Pins UMAX/8
Oper. Temp. (°C) -40 to +125
BudgetaryPrice (See Notes) 1.15


MAX16997AAUA+ Power Management ICs - PMIC by Analog Devices

MPU SUPERVISOR 40V UMAX-8

Status: Unknown
Series: -
RoHS: Unknown
Download Datasheet Visit Manufacturer Site View Pricing & Stock

Specifications

Threshold Voltage 1.255V
No. of Supervisors / Monitors 1Monitors
Supply Voltage Min 5V
Supply Voltage Max 40V
Reset Type Active-Low Open-Drain
Digital IC Case µMAX
No. of Pins 8Pins
Delay Time 5ms
Operating Temperature Min -40°C
Operating Temperature Max 125°C
Product Range -
Automotive Qualification Standard -
MSL MSL 1 - Unlimited
SVHC No SVHC (15-Jan-2018)

Alternative Descriptions

Mp Supervisory Circuit, -40 To 125Deg C | Newark Electronics
MP SUPERVISORY CIRCUIT, -40 TO 125DEG C | element14

Frequently Asked Questions

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This part has not been flagged as RoHS Compliant.

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