AS1920 datasheet(7/15 Pages) AMSCO

部件名	AS1920

功能描述	Triple-Voltage, Micro-Power Microprocessor Supervisory Circuits

PDF	15 Pages

Scroll/Zoom	100%

制造商	AMSCO [ams AG]

网页	http://www.ams.com

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AS1920/AS1922

Datasheet - D e t a i l e d D e s c r i p t i o n

8 Detailed Description

The AS1920/AS1922 microprocessor supervisory circuits were designed to generate a reset when at least one of the

three monitored supply voltages falls below its respective trip threshold.

These very-low-current (6.5µA, typ) devices maintain reset for a minimum timeout period after all supplies have stabi-

lized. Guaranteed to be in the correct state for VCC > +1.0V, these devices are perfect for multiple-voltage systems with

low current requirements and strict monitoring requirements.

Figure 9. AS1920 Block Diagram

Figure 10. VCC Monitor Timing Diagram

AS1920

–

VCC18

VCC3

VCCA

VCC

Internal

–

Power

Detect

–

Bandgap

Reference

RESETN

200ms Pulse Generator

200ms

Delay

VCC3

GND

1.5V

VCCX

tUV

tRST

RESETN

VRTX

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