The MAX16033–MAX16040 supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery-control functions in microprocessor (µP) systems. The devices significantly improve system reliability and accuracy compared to other ICs or discrete components. The MAX16033–MAX16040 provide µP reset, backup-battery switchover, power-fail warning, watchdog, and chip-enable gating features.

The MAX16033–MAX16040 operate from supply voltages up to 5.5V. The factory-set reset threshold voltage ranges from 2.32V to 4.63V. The devices feature a manual-reset input (MAX16033/MAX16037), a watchdog timer input (MAX16034/MAX16038), a battery-on output (MAX16035/MAX16039), an auxiliary adjustable reset input (MAX16036/MAX16040), and chip-enable gating (MAX16033–MAX16036). Each device includes a power-fail comparator and offers an active-low push-pull reset or an active-low open-drain reset.

The MAX16033–MAX16040 are available in 2mm x 2mm, 8-pin or 10-pin µDFN packages and are fully specified from -40°C to +85°C.

MAX16033, MAX16034, MAX16035, MAX16036, MAX16037, MAX16038, MAX16039, MAX16040: Typical Operating Circuit

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Key Features

Low 1.2V Operating Supply Voltage
Precision Monitoring of 5.0V, 3.3V, 3.0V, and 2.5V Power-Supply Voltages
Independent Power-Fail Comparator
Debounced Manual-Reset Input
Watchdog Timer, 1.6s Timeout
Battery-On Output Indicator
Auxiliary User-Adjustable RESETIN
Low 13µA Quiescent Supply Current
Two Available Output Structures:
- Active-Low Push-Pull Reset
- Active-Low Open-Drain Reset
Active-Low Reset Valid Down to 1.2V
Power-Supply Transient Immunity
140ms (min) Reset Timeout Period
Small 2mm x 2mm, 8-Pin and 10-Pin µDFN Packages

Applications/Uses

Portable/Battery-Powered Equipment
POS Equipment
Critical µP/µC Power Monitoring
Set-Top Boxes
Controllers
Computers
Fax Machines
Industrial Control
Real-Time Clocks
Intelligent Instruments

Parametric Specs

Part Number

Reset Thresh.
(V)

Reset Out

I_CC
(µA)

Oper. Temp.
(°C)

Package/Pins

Budgetary
Price

max

See Notes

MAX16033

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active Low

Open Drain

Push-Pull

-40 to +85

UDFN/10

$2.37 @1k

MAX16034

MAX16035

MAX16036

MAX16037

$2.26 @1k

MAX16039

UDFN/8

$3.21 @1k

MAX16040

UDFN/8

See All Battery Backup Circuits (81)

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

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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