快速浏览 - MAX690A, MAX692A, MAX802L, MAX802M, MAX805L 微处理器监控电路

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The MAX690A/MAX692A/MAX802L/MAX802M/MAX805L reduce the complexity and number of components required for power-supply monitoring and battery-control functions in microprocessor (µP) systems. They significantly improve system reliability and accuracy compared to separate ICs or discrete components.

These parts provide four functions:
1) A reset output during power-up, power-down, and brownout conditions.
2) Battery-backup switching for CMOS RAM, CMOS µP, or other low-power logic.
3) A reset pulse if the optional watchdog timer has not been toggled within 1.6sec.
4) A 1.25V threshold detector for power-fail warning or low-battery detection, or to monitor a power supply other than +5V.

The parts differ in their reset-voltage threshold levels and reset outputs. The MAX690A/MAX802L/MAX805L generate a reset pulse when the supply voltage drops below 4.65V, and the MAX692A/MAX802M generate a reset below 4.40V. The MAX802L/MAX802M guarantee power-fail accuracies to ±2%. The MAX805L is the same as the MAX690A except that RESET is provided instead of active-low RESET.

All parts are available in 8-pin DIP and SO packages. The MAX690A/MAX802L are pin compatible with the MAX690 and MAX694. The MAX692A/MAX802M are pin compatible with the MAX692.

关键特性

应用/使用

Precision Supply-Voltage Monitor:
- 4.65V for MAX690A/MAX802L/MAX805L
- 4.40V for MAX692A/MAX802M
Reset Time Delay -200ms
Watchdog Timer -1.6sec Timeout
Battery-Backup Power Switching
200µA Quiescent Supply Current
50nA Quiescent Supply Current in Battery-Backup Mode
Voltage Monitor for Power-Fail or Low-Battery Warning
Power-Fail Accuracy Guaranteed to ±2% (MAX802L/M)
Guaranteed RESET-bar Assertion to V_CC = 1V
8-Pin SO and DIP Packages
通过美国保险商实验室协会(UL®)认证

	汽车电子
	电池供电计算机/控制器
	精确的µP监控
	智能仪表

Key Specifications: Battery Backup Circuits

Part Number

Reset Threshold Range (V)

Active-Low Reset Output

Active-High Reset Output

Max. I_CC (µA)

Features

RoHS Available

Industry Qualified

Package

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

Operating Temp. Range (°C)

Price^**

MAX690A

3.3 to 5.5

Push-Pull

350

•	Adjustable Reset Input

•	Power Fail Comparator

•

Watchdog

Yes

MIL-STD-883B

CDIP(N)/8
PDIP(N)/8
SOIC(N)/8

-55 to +125
-40 to +85
0 to +70

$3.26 @ 1k

MAX692A

Push-Pull

MIL-STD-883B

CDIP(N)/8
PDIP(N)/8
SOIC(N)/8

-55 to +125
-40 to +85
0 to +70

$3.26 @ 1k

MAX802L

Push-Pull

PDIP(N)/8
SOIC(N)/8

-40 to +85
0 to +70

$3.59 @ 1k

MAX802M

Push-Pull

PDIP(N)/8
SOIC(N)/8

-40 to +85
0 to +70

$3.59 @ 1k

MAX805L

Push-Pull

MIL-STD-883B

CDIP(N)/8
PDIP(N)/8
SOIC(N)/8

-55 to +125
-40 to +85
0 to +70

$3.04 @ 1k

See All Battery Backup Circuits (86)

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.