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

應(yīng)用 Application

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