The MAX817/MAX818/MAX819 microprocessor (µP) supervisory circuits simplify power-supply monitoring, battery control, and chip-enable gating in µP systems by reducing the number of components required. These devices are designed for use in +5V-powered systems. Low supply current (11µA typical) and small package size make these devices ideal for portable applications. The MAX817/MAX818/MAX819 are specifically designed to ignore fast transients on V_CC. Other supervisory functions include active-low reset, backup-battery switchover, watchdog input, battery freshness seal, and chip-enable gating. The Selector Guide in the full data sheet lists the specific functions available from each device.

These devices offer two pretrimmed reset threshold voltages for ±5% or ±10% power supplies: 4.65V for the L versions and 4.40V for the M versions. The MAX817/ MAX818/MAX819 are available in space-saving µMAX® packages, as well as 8-pin DIP/SO.

MAX817L, M, MAX818L, M, MAX819L, M: Typical Operating Circuit

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Key Features

Precision Supply-Voltage Monitor:

4.65V (MAX81_L)
4.40V (MAX81_M)

11µA Quiescent Supply Current
200ms Reset Time Delay
Watchdog Timer with 1.6sec Timeout (MAX817/MAX818)
Battery-Backup Power Switching; Battery Voltage Can Exceed V_CC
Battery Freshness Seal
On-Board, 3ns Gating of Chip-Enable Signals (MAX818)
Uncommitted Voltage Monitor for Power-Fail or Low-Battery Warning (MAX817/MAX819)
Manual Reset Input (MAX819)

Applications/Uses

Battery-Powered Computers/Controllers
Critical µP Monitoring
Embedded Controllers
Intelligent Instruments
Portable Equipment

Parametric Specs

Part Number

Reset Thresh.
(V)

Reset Out

I_CC
(µA)

Oper. Temp.
(°C)

Package/Pins

Budgetary
Price

max

See Notes

MAX817

3.3 to 5.5

Active Low

Push-Pull

-40 to +85

0 to +70

PDIP/8

SOIC (N)/8

UMAX/8

$2.76 @1k

MAX818

PDIP/8

SOIC (N)/8

UMAX/8

$3.28 @1k

MAX819

PDIP/8

SOIC (N)/8

UMAX/8

$2.91 @1k

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 Data

Product Reliability Reports: MAX817L.pdf
Request Reliability Report for: MAX817M
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

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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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