Datasheet > AS1922

AS1922

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
艾迈斯 - AMSCO		微处理器监控
页数	文件大小	规格书
2页	342K
描述
Triple-Voltage, Micro-Power Microprocessor Supervisory Circuits

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AS1922 数据手册

austriamicrosystems

Product Brief

AS1920, AS1922

Triple-Voltage, Micro-Power Microprocessor

Supervisory Circuits

1 General Description

2 Key Features

ꢀ

Simultaneous Triple-Voltage Monitoring

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.

Very-Low Supply Current: 6.5µA

These very-low-current (6.5µA, typ) devices maintain

reset for a minimum timeout period after all supplies

have stabilized. Guaranteed to be in the correct state for

VCC > +1.0V, these devices are perfect for multiple-volt-

age systems with low current requirements and strict

monitoring requirements.

±1.5% Accuracy Over Temperature

Reset Time Delay: 200ms

The devices are available as the standard products

listed in Table 1.

Power Supply Transient Immunity

Guaranteed Reset for VCC3 ≥ 1V or VCC18 ≥ 1V

Active-Low Push/Pull Reset Output (AS1920)

Active-Low Open-Drain Reset Output (AS1922)

5-pin SOT23 Package

Table 1. Standard Products

Model

Output Type Supervisory Voltages

AS1920-18

AS1922-18

Push/Pull

3V, 1.8V, Adjustable

Open-Drain

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.

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.

The AS1920 and AS1922 are available in a 5-pin

SOT23 package.

Figure 1. Typical Application Diagram

1.8V

2.5V

System

Logic

VCC3

AS1920/

RESETN

VCC18

AS1922

130kΩ

0.1µF

VCCA

GND

100kΩ

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Revision 0.65

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