MAX6821, MAX6822, MAX6823, MAX6824, MAX6825 低电压、SOT23封装、微处理器监控电路，带有手动复位及看门狗定时器

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The MAX6821—MAX6825 are low-voltage microprocessor (µP) supervisory circuits that combine voltage monitoring, watchdog timer, and manual reset input functions in a 5-pin SOT23 package. Microprocessor supervisory circuits significantly improve system reliability and accuracy compared to separate ICs or discrete components. These devices assert a reset signal whenever the monitored voltage drops below its preset threshold, keeping it asserted for a minimum timeout period after V_CC rises above the threshold. In addition, a watchdog timer monitors against code execution errors. A debounced manual reset is also available. The MAX6821—MAX6825 monitor voltages from +1.8V to +5.0V. These outputs are guaranteed to be in the correct state for V_CC down to +1.0V.

Nine preprogrammed reset threshold voltages are available (see the Threshold Suffix Guide). The MAX6821, MAX6822, and MAX6823 all have a manual reset input and a watchdog timer. The MAX6821 has push-pull RESET, the MAX6822 has open-drain active-low RESET, and the MAX6823 has push-pull active-low RESET. The MAX6824 has a watchdog timer and both push-pull active-low RESET and push-pull RESET. The MAX6825 has a manual reset input and both push-pull active-low RESET and push-pull RESET. The Selector Guide explains the functions offered in this series of parts.

关键特性

应用/使用

Monitors +1.8V, +2.5V, +3.0V, +3.3V, +5.0V Supplies
140ms (min) Reset Timeout Delay
1.6s Watchdog Timeout Period (MAX6821/MAX6822/MAX6823/MAX6824)
Manual Reset Input (MAX6821/MAX6822/MAX6823/MAX6825)
Three Reset Output Options
- Push-Pull Active-Low RESET
- Push-Pull RESET
- Open-Drain Active-Low RESET
Guaranteed Reset Valid to V_CC = +1.0V
Immune to Short Negative V_CC Transients
No External Components
Small 5-Pin SOT23 Packages

	汽车电子
	计算机与控制器
	精确的µP监视
	嵌入式控制器
	智能仪表
	便携式电池供电设备
	机顶盒

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

Reset Thresh. Acc. (% @+25°C)

Max. I_CC (µA)

RoHS Available

Industry Qualified

Package

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

Operating Temp. Range (°C)

Price^**

MAX6821

1.2 to 1.8
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

2.5

Yes

Automotive - General

SOT-23/5

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

$1.15 @ 1k

MAX6822

Open Drain

Input (WDI)

1s to 2s

Manual Reset

$1.15 @ 1k

MAX6823

Push-Pull

Input (WDI)

1s to 2s

Manual Reset

$1.15 @ 1k

MAX6824

Push-Pull

Input (WDI)

1s to 2s

$1.15 @ 1k

MAX6825

Push-Pull

No Watchdog

Manual Reset

$1.15 @ 1k

See All Supervisors (1 Monitored Voltage) (268)

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.