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AS1922 Datasheet(PDF) 7 Page - ams AG

No. de pieza AS1922
Descripción Electrónicos  Triple-Voltage, Micro-Power Microprocessor Supervisory Circuits
PDF  15 Pages
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Fabricante Electrónico  AMSCO [ams AG]
Página de inicio  http://www.ams.com
Logo AMSCO - ams AG

AS1922 Datasheet(HTML) 7 Page - ams AG

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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
–
+
4
VCC18
5
VCC3
3
VCCA
VCC
Internal
–
+
Power
Detect
–
+
Bandgap
Reference
1
RESETN
200ms Pulse Generator
200ms
Delay
VCC3
2
GND
1.5V
VCCX
tUV
tRST
RESETN
VRTX



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