器件号	Replacement	Explanation

说明

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The DS1705/DS1706 3.3- or 5.0-Volt MicroMonitor monitors three vital conditions for a microprocessor: power supply, software execution, and external override. A precision temperature compensated reference and comparator circuit monitor the status of V_CC at the device and at an upstream point for maximum protection. When the sense input detects an out-of-tolerance condition a non-maskable interrupt is generated. As the voltage at the device degrades, an internal power fail signal is generated which forces the reset to an active state. When V_CC returns to an in-tolerance condition, the reset signal is kept in the active state for a minimum of 130ms to allow the power supply and processor to stabilize.

The second function the DS1705/DS1706 performs is pushbutton reset control. The DS1705/DS1706 debounces the pushbutton input and guarantees an active reset pulse width of 130ms minimum.

The third function is a watchdog timer. The DS1705/DS1706 has an internal timer that forces the WDO signal to the active state if the strobe input is not driven low prior to time-out.

DS1705、DS1706：原理框图 放大+

关键特性

• Halts and restarts an out-of-control microprocessor
• Holds microprocessor in check during power transients
• Automatically restarts microprocessor after power failure
• Monitors pushbutton for external override
• Accurate 5%, 10% or 20% resets for 3.3V systems and 5% or 10% resets for 5.0V systems
• Eliminates the need for discrete components
• 3.3V 20% tolerance for use with 3.0V systems
• Pin-compatible with the MAXIM MAX705/MAX706 in 8-pin DIP, 8-pin SO, and µSOP
• 8-pin DIP, 8-pin SO and 8-pin µSOP packages
• Industrial temperature range -40°C to +85°C