The MAX814/MAX815/MAX816 are high-accuracy microprocessor (µP) supervisory circuits that provide power-on reset, watchdog, and power-fail functions. They eliminate manual trimming and improve reliability in critical applications needing high-accuracy reset thresholds. The active-low RESET output is guaranteed to be in the correct state for V_CC down to 1V. The reset comparator is designed to ignore fast transients on V_CC. Reset thresholds are available for operation with a variety of 3V and 5V supply voltages.

A 75µA maximum supply current makes the MAX814/MAX815/MAX816 ideal for use in portable equipment. All three devices are available in 8-pin DIP and SO packages. See the Selector Table below for a review of features.

MAX814, MAX815, MAX816: Typical Application Circuits

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Key Features

±1% Worst-Case Reset Threshold Accuracy
4.8V, 4.7V, 4.55V, 3.03V, or Adjustable Reset Thresholds
±1% Low-Line Threshold Accuracy (MAX814) 60mV Above Reset Threshold
200ms Reset Time Delay
Active-Low RESET Output
Active-High RESET Output (MAX814/MAX816)
75µA Max Supply Current
Guaranteed active-low RESET Valid to V_CC = 1V
Manual Reset Input
±2% Power-Fail Comparator
Independent Watchdog with 1.56sec Timeout (MAX815)
Power-Supply Glitch Immunity
8-Pin SO and DIP Packages

Applications/Uses

Controllers
Critical µP Monitoring
Intelligent Instruments
Medical Equipment
Portable Battery-Powered Equipment
Set-Top Boxes

Parametric Specs

Part Number

Reset Thresh.
(V)

Reset Out

t_RESET

Watchdog Feature

Watchdog Timeout

Supervisor Features

Reset Thresh. Accur.
(%)

I_CC
(µA)

Package/Pins

Budgetary
Price

min

@ +25°C

max

See Notes

MAX814

2.5 to 3.3

3.3 to 5.5

Active High

Active Low

Push-Pull

85ms to 300ms

No Watchdog

Adjustable Reset Input

Manual Reset

Power Fail Comparator/Low Battery Detect

PDIP/8

SOIC (N)/8

$5.45 @1k

MAX815

2.5 to 3.3

3.3 to 5.5

Active Low

Push-Pull

Input (WDI)

Input/Output (WDI/WDO)

1s to 2s

PDIP/8

SOIC (N)/8

$6.82 @1k

MAX816

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active High

Active Low

Push-Pull

No Watchdog

PDIP/8

SOIC (N)/8

$5.82 @1k

See All Supervisors (1 Monitored Voltage) (256)

Pricing Notes:

This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Design Resources

Technical Documents

App Note 655 Supervisor ICs Monitor Battery-Powered Equipment

Quality and Environmental Data

Product Reliability Reports: MAX815.pdf
Lead-Free Package Tin (Sn) Whisker Reports

Quality And Environmental

Device	Fab Process	Technology	Sample size	Rejects	FIT at 25°C	FIT at 55°C

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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