as1920 austriamicrosystems, as1920 Datasheet
as1920
Manufacturer Part Number
as1920
Description
Triple-voltage, Micro-power Microprocessor Supervisory Circuits
Manufacturer
austriamicrosystems
Datasheet
1.AS1920.pdf
(2 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
as1920-18-T
Manufacturer:
Alliance
Quantity:
6 000
A S 1 9 2 0 , A S 1 9 2 2
Tr i p l e - Vo l ta g e , M i c r o - P o w e r M i c r o p r o c e s s o r
Supervi s ory Ci rcuits
1 General Description
The AS1920 and 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 (6.2µA, typ) devices maintain
reset for a minimum timeout period after all supplies
have stabilized. Guaranteed to be in the correct state for
V
age systems with low current requirements and strict
monitoring requirements.
The devices are available as the standard products
listed in
Table 1. Standard Products
All devices monitor primary and secondary factory-
trimmed voltages. Additionally, a third monitoring voltage
can be selected via an external resistor divider.
The AS1920 has an active-low push/pull reset output,
whereas the AS1922 has an active-low open-drain reset
output.
The AS1920 and AS1922 are available in a 5-pin
SOT23 package.
Figure 1. Typical Application Diagram
www.austriamicrosystems.com
AS1920-18
AS1922-18
CC
Model
> +1.0V, these devices are perfect for multiple-volt-
Table
1.
Output Type
Open-Drain
Push/Pull
1.8V
2.5V
3V
0.1µF
Supervisory Voltages
3V, 1.8V, Adjustable
3V, 1.8V, Adjustable
0.1µF
130kΩ
100kΩ
1%
1%
R
R
1
2
Revision 1.00
V
V
V
CC18
CCA
CC3
5
4
3
2 Key Features
3 Applications
The devices are ideal for personal computers, note-
books, battery-powered systems, embedded controllers,
intelligent instruments, automotive systems, critical CPU
monitoring, and any multi-supply monitoring application.
!
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AS1920/
AS1922
Simultaneous Triple-Voltage Monitoring
Very-Low Supply Current: 6.2µA
±1.5% Accuracy Over Temperature
Reset Time Delay: 200ms
Power Supply Transient Immunity
Guaranteed Reset for V
Active-Low Push/Pull Reset Output (AS1920)
Active-Low Open-Drain Reset Output (AS1922)
5-pin SOT23 Package
1
RESETN
2
GND
System
Logic
CC3
≥ 1V or V
CC18
P r o d u c t B r i e f
≥ 1V
1 - 2
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as1920 Summary of contents
Page 1
... Additionally, a third monitoring voltage can be selected via an external resistor divider. The AS1920 has an active-low push/pull reset output, whereas the AS1922 has an active-low open-drain reset output. The AS1920 and AS1922 are available in a 5-pin SOT23 package. Figure 1. Typical Application Diagram 3V 1.8V 2.5V 0.1µ ...
Page 2
... AS1920/AS1922 Product Brief Copyrights Copyright © 1997-2007, austriamicrosystems AG, Schloss Premstaetten, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered ®. All rights reserved. The material herein may not be reproduced, adapted, merged, trans- lated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. ...