MAX823, MAX823L, MAX823M, MAX823R, MAX823S, MAX823T, MAX823Y, MAX823Z, MAX824, MAX824L, MAX824M, MAX824R, MAX824S, MAX824T, MAX824Y, MAX824Z, MAX825, MAX825L, MAX825M, MAX825R, MAX825S, MAX825T, MAX825Y, MAX825Z 5-Pin Microprocessor Supervisory Circuits with Watchdog Timer and Manual Reset

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The MAX823/MAX824/MAX825* microprocessor (µP) supervisory circuits combine reset output, watchdog, and manual reset input functions in 5-pin SOT23 and SC70 packages. They significantly improve system reliability and accuracy compared to separate ICs or discrete components. The MAX823/MAX824/MAX825 are specifically designed to ignore fast transients on V_CC.

Seven preprogrammed reset threshold voltages are available (see Reset Threshold Table). All three devices have an active-low reset output, which is guaranteed to be in the correct state for V_CC down to 1V. The MAX823 also offers a watchdog input and manual reset input. The MAX824 offers a watchdog input and a complementary active-high reset. The MAX825 offers a manual reset input and a complementary active-high reset. The Selector Guide explains the functions offered in this series of parts.

Key Features

Applications/Uses

Precision Monitoring of +2.5V, +3V, +3.3V, and +5V Power Supplies
Operating Current:
- 6µA (MAX823L/M) (SC70)
- 2µA (MAX825T/S/R/Z/Y) (SC70)
Fully Specified Over Temperature
140ms min Power-On Reset
Guaranteed active-low RESET Valid to V_CC = 1V
Power-Supply Transient Immunity
Watchdog Timer with 1.6s Timeout (MAX823/MAX824)
Manual Reset Input (MAX823/MAX825)
No External Components

	Automotive Electronics
	Computers and Controllers
	Critical µP Monitoring
	Embedded Controllers
	Intelligent Instruments
	Portable Battery-Powered Equipment

Key Specifications: Microprocessor Supervisors

Part Number

Number of Monitored Voltages

Reset Threshold Range (V)

Active-Low Reset Output

Active-High Reset Output

Min. Reset Timeout Range

Watchdog Feature

Nom. Watchdog Timeout Range

Supervisor Features

Max. I_CC (µA)

RoHS Available

Industry Qualified

Package

Smallest Available Package (max w/pins) (mm²)

Operating Temp. Range (°C)

Price^*

MAX823

1.8 to 2.5
2.5 to 3.3
3.3 to 5.5

Push-Pull

85ms to 300ms

Input (WDI)

1s to 2s

Manual Reset

Yes

Automotive - General

SC-70/5
SOT-23/5

-40 to +125
-40 to +85
0 to +70

$1.15 @ 1k

MAX824

Push-Pull

Input (WDI)

1s to 2s

$1.15 @ 1k

MAX825

Push-Pull

No Watchdog

Manual Reset

$1.10 @ 1k

See All Microprocessor Supervisors (435)

Key Specifications: Supervisors (1 Monitored Voltage)

Part Number

Reset Threshold Range (V)

Active-Low Reset Output

Active-High Reset Output

Min. Reset Timeout Range

Watchdog Feature

Nom. Watchdog Timeout Range

Supervisor Features

Max. I_CC (µA)

Supervisor Functions

Industry Qualified

Package

Smallest Available Package (max w/pins) (mm²)

RoHS Available

Operating Temp. Range (°C)

Price^*

MAX823

1.8 to 2.5
2.5 to 3.3
3.3 to 5.5

Push-Pull

85ms to 300ms

Input (WDI)

1s to 2s

Manual Reset

Simple Reset/ Power-On Reset
Watchdog Timer

Automotive - General

SC-70/5
SOT-23/5

Yes

-40 to +125
-40 to +85
0 to +70

$1.15 @ 1k

MAX824

Push-Pull

Input (WDI)

1s to 2s

Simple Reset/ Power-On Reset
Watchdog Timer

$1.15 @ 1k

MAX825

Push-Pull

No Watchdog

Manual Reset

Simple Reset/ Power-On Reset

$1.10 @ 1k

See All Supervisors (1 Monitored Voltage) (275)

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.

*Patents Pending

Active-low reset with manual reset and watchdog timer (MAX823)

Active-low reset and active-high reset with watchdog timer (MAX824)

Active-low reset and active-high reset with manual reset (MAX825)