Analog Devices DS1708 Product Info

• 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
• 20% tolerance compatible with 3.0V systems
• Pin compatible with the MAXIM MAX707/MAX708 in 8-pin DIP, 8-pin SO packages
• 8-pin DIP, 8-pin and µSOP SO and 8-pin µSOP packages available
• Industrial temperature range -40°C to +85°C

The DS1707/DS1708 3.3- or 5.0-Volt MicroMonitor monitors three vital conditions for a microprocessor: power supply, voltage sense, 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.