参数资料
| 型号： | AS1922-18-T |
| 厂商： | ams |
| 文件页数： | 2/15页 |
| 文件大小： | 0K |
| 描述： | IC SUPERVISOR OPEN-DRAIN SOT23-5 |
| 标准包装： | 1 |
| 类型： | 多压监控器 |
| 监视电压数目： | 3 |
| 输出： | 开路漏极或开路集电极 |
| 复位： | 低有效 |
| 复位超时： | 最小为 140 ms |
| 电压 - 阀值： | 1.683V，2.805V，可调 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 标准包装 |
| 其它名称： | AS1922-18-TDKR |
AS1920, AS1922
Tri 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
D a ta S h e e t
1 General Description
2 Key Features
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 CC > +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 .
!
!
!
!
!
Simultaneous Triple-Voltage Monitoring
Very-Low Supply Current: 6.2μA
±1.5% Accuracy Over Temperature
Reset Time Delay: 200ms
Power Supply Transient Immunity
Table 1. Standard Products
Model Output Type
Supervisory Voltages
!
Guaranteed Reset for V CC3 ≥ 1V or V CC18 ≥ 1V
AS1920-18
AS1922-18
Push/Pull
Open-Drain
3V, 1.8V, Adjustable
3V, 1.8V, Adjustable
!
Active-Low Push/Pull Reset Output (AS1920)
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
!
!
Active-Low Open-Drain Reset Output (AS1922)
5-pin SOT23 Package
output.
The AS1920 and AS1922 are available in a 5-pin
SOT23 package.
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.
Figure 1. Typical Application Diagram
3V
1.8V
2.5V
5
V CC3
System
Logic
4
AS1920/
1
R 1
130k Ω
V CC18
AS1922
RESETN
0.1μF
1%
0.1μF
R 2
100k Ω
3
V CCA
2
GND
1%
www.austriamicrosystems.com
Revision 1.00
1 - 14
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