Datasheet > AS1920_07

AS1920_07

更新时间： 2022-05-10 15:58:19

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
15页	733K
描述
Triple-Voltage, Micro-Power Microprocessor Supervisory Circuits

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AS1920_07 数据手册

Data Sheet

AS1920, AS1922

Triple-Voltage, Micro-Power Microprocessor

Supervisory Circuits

1 General Description

2 Key Features

ꢀ

Simultaneous Triple-Voltage Monitoring

Very-Low Supply Current: 6.2µA

±1.5% Accuracy Over Temperature

Reset Time Delay: 200ms

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

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

age systems with low current requirements and strict

monitoring requirements.

The devices are available as the standard products

listed in Table 1.

Power Supply Transient Immunity

Table 1. Standard Products

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

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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