MAX817L, MAX817M, MAX818L, MAX818M, MAX819L, MAX819M +5V Microprocessor Supervisory Circuits

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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 below 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.

Key Features

Applications/Uses

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)
Underwriters Laboratories (UL®) Recognized

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

Key Specifications: Battery Backup Circuits

Part Number

Reset Threshold Range (V)

Active-Low Reset Output

Max. I_CC (µA)

Features

RoHS Available

Package

Operating Temp. Range (°C)

Price^**

MAX817

3.3 to 5.5

Push-Pull

•	Adjustable Reset Input

•	Batt Freshness Seal

•	Power Fail Comparator

•

Watchdog

Yes

PDIP/8
SOIC/8
uMAX/8

-40 to +85
0 to +70

$2.44 @ 1k

MAX818

•	Batt Freshness Seal

•	Chip Enable Gate

•

Watchdog

$2.74 @ 1k

MAX819

•	Adjustable Reset Input

•	Batt Freshness Seal

•	Manual Reset

•	Power Fail Comparator

•

Watchdog

$2.07 @ 1k

See All Battery Backup Circuits (92)

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 prices and delivery, please see the price and availability page or contact an authorized distributor.