Формирователи импульса сброса DS1705ESA+

Схема контроля микропроцессора , напряжение 1.2В-5.5В, пороговое значение 4.65В/задержка 205мс

The DS1705ESA+ is a 5V MicroMonitor in 8 pin NSOIC package. It monitors three vital conditions for microprocessor such as power supply, software execution and external override. A precision temperature compensated reference & comparator circuit monitor status of VCC at device and at an upstream point for maximum protection. A non maskable interrupt is generated when sense input detects an out of tolerance condition. As voltage at device degrades, an internal power-fail signal forces reset to an active state. The reset signal is kept in active state for a minimum of 130ms when VCC returns to in-tolerance condition to allow power supply and processor to stabilize. The second function of DS1705 is pushbutton reset control. It debounces pushbutton input and provides an active reset pulse width of 130ms minimum. The third function is watchdog timer. It has an internal timer that forces WDS output signal to active state if strobe input is not driven low prior to time out.

• Supply voltage range from 1.2V to 5.5V
• Operating temperature range from -40°C to 85°C
• 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% reset for 5V systems and watchdog timeout period of 1.6s
• Pin compatible with MAXIM MAX705 in 8 pin DIP, 8 pin SOIC and µSOP packages
• VCC trip point of 4.65V and reset active time of 205ms
• Active-low, push-pull reset outputand adjustable reset input

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