NE56625-20D中文资料System reset with Watchdog timer数据手册恩XP规格书

描述 Description

GENERAL DESCRIPTION
The NE56625-20 is comprised of a power-on reset, a Watchdog timer and low battery detection circuit. The NE56625 is designed to generate an Active-LOW reset signal for a variety of microprocessor and logic systems. Accurate reset signals are generated during momentary power interruptions or whenever power supply voltages sag to intolerable levels. The built-in Watchdog timer monitors the microprocessor and ensures it is operating properly. Any abnormal system operations due to microprocessor malfunctions are terminated by a system reset generated by the Watchdog. To accommodate a wide range of system requirements, the Watchdog Monitoring Time and power-on reset delay time are programmable from 10 ms to 10 sec.FEATURES
• Accurate threshold detection voltages:
   – Low battery: 2.2 V ±3%
   – Power-on reset: 2.0 V ±3%
• Low hysteresis voltage (both low battery check and power-on
   reset): 50 mV typ.
• Low supply current: 150 µA typ.
• Programmable power-on reset detection voltage
• Programmable power-on reset delay: 10 ms to 10 s
• Internal Watchdog timer programmable with external resistor and
   capacitor: 10 ms to 10 s
• Reset assertion with VCC down to 0.8 VDC (typical)
• Few external components requiredAPPLICATIONS
• Microcomputer systems and logic systems
• 2 V cordless phones
• Various portable, battery operated equipment

特性 Features

• Accurate threshold detection voltages:
   – Low battery: 2.2 V ±3%
   – Power-on reset: 2.0 V ±3%
• Low hysteresis voltage (both low battery check and power-on
   reset): 50 mV typ.
• Low supply current: 150 µA typ.
• Programmable power-on reset detection voltage
• Programmable power-on reset delay: 10 ms to 10 s
• Internal Watchdog timer programmable with external resistor and
   capacitor: 10 ms to 10 s
• Reset assertion with VCC down to 0.8 VDC (typical)
• Few external components required

应用 Application

• Microcomputer systems and logic systems
• 2 V cordless phones
• Various portable, battery operated equipment