概述
The MAX705-MAX708/MAX813L microprocessor (µP) supervisory circuits reduce the complexity and number of components required to monitor power-supply and battery functions in µP systems. These devices significantly improve system reliability and accuracy compared to separate ICs or discrete components.
The MAX705/MAX706/MAX813L provide four functions:
1) A reset output during power-up, power-down, and brownout conditions.
2) An independent watchdog output that goes low if the watchdog input has not been toggled within 1.6 seconds.
3) A 1.25V threshold detector for power-fail warning, low-battery detection, or for monitoring a power supply other than +5V.
4) An active-low manual-reset input.
The MAX707/MAX708 are the same as the MAX705/ MAX706, except an active-high reset is substituted for the watchdog timer. The MAX813L is the same as the MAX705, except RESET is provided instead of RESET-bar.
Two supply-voltage monitor levels are available: The MAX705/MAX707/MAX813L generate a reset pulse when the supply voltage drops below 4.65V, while the MAX706/MAX708 generate a reset pulse below 4.40V. All four parts are available in 8-pin DIP, SO and µMAX® packages.
| 关键特性 |
|
应用 |
- µMAX Package: Smallest 8-Pin SO
- Guaranteed RESET-bar Valid at VCC = 1V
- Precision Supply-Voltage Monitor
- 4.65V in MAX705/MAX707/MAX813L
- 4.40V in MAX706/MAX708
- 200ms Reset Pulse Width
- Debounced TTL/CMOS-Compatible Manual-Reset Input
- Independent Watchdog Timer-1.6sec Timeout (MAX705/MAX706)
- Active-High Reset Output (MAX707/MAX708/MAX813L)
- Voltage Monitor for Power-Fail or Low-Battery Warning
|
| 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 |
Reset Thresh. Acc. (% at +25°C) |
Max. ICC (µA) |
Package |
Package Type |
Operating Temp. Range (°C) |
| MAX705 |
1 2 |
3.3 to 5.5 |
Push-Pull |
- |
85ms to 300ms |
Input (WDI)
Input/Output (WDI/WDO) |
1s to 2s |
Adjustable Reset Input Manual Reset Power Fail Comparator/Low Line |
2.5 |
350.0 |
8/PDIP
8/SOIC
8/uMAX |
µMAX Plastic DIP SOIC |
0 to +70 -40 to +125 -40 to +85 -55 to +125 |
| MAX706 |
Push-Pull |
- |
Input (WDI)
Input/Output (WDI/WDO) |
1s to 2s |
2.5 |
8/PDIP
8/SOIC
8/uMAX |
| MAX707 |
Push-Pull |
Push-Pull |
No Watchdog |
- |
2.5 |
8/PDIP
8/SOIC
8/uMAX |
| MAX708 |
Push-Pull |
Push-Pull |
No Watchdog |
- |
2.5 |
8/PDIP
8/SOIC
8/uMAX |
| MAX813 |
- |
Push-Pull |
Input/Output (WDI/WDO) |
1s to 2s |
1.5 |
See Data Sheet | |
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| 图表 |
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