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AMS812T 参数 Datasheet PDF下载

AMS812T图片预览
型号: AMS812T
PDF下载: 下载PDF文件 查看货源
内容描述: 3V ,3.3V和5V电源电压的精度监测 [Precision Monitoring of 3V, 3.3V, and 5V Power-Supply Voltages]
分类和应用: 监控
文件页数/大小: 8 页 / 310 K
品牌: AMS [ Advanced Monolithic Systems Ltd ]
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AMS811/812
General Description
The
AMS811 / 812
are low-power microprocessor
(µP) supervisory circuits used to monitor power sup-
plies in µP and digital systems. They provide excellent
circuit reliability and low cost by eliminating external
components and adjustments when used with 5V-
powered or 3V-powered circuits. The
AMS811 / 812
also provide a debounced manual reset input.
These devices perform a single function: They assert a
reset signal whenever the V
CC
supply voltage falls
below a preset threshold, keeping it asserted for at
least 140ms after V
CC
has risen above the reset thresh-
old. The only difference between the two devices is that
the
AMS811
has an active-low RESET output (which is
guaranteed to be in the correct state for V
CC
down to
1V), while the
AMS812
has an active-high RESET out-
put. The reset comparator is designed to ignore fast
transients on V
CC
. Reset thresholds are available for
operation with a variety of supply voltages.
Low supply current makes the
AMS811 / 812
ideal
for use in portable equipment. The devices come in a
4-pin SOT143 package.
Features
Precision Monitoring of 3V, 3.3V, and 5V
Power-Supply Voltages
6µA Supply Current
140ms Min Power-On Reset Pulse Width;
RESET
Output (AMS811), RESET Output (AMS812)
Guaranteed Over Temperature
Guaranteed
RESET
Valid to V
CC
= 1V (AMS811)
Power-Supply Transient Immunity
No External Components
4-Pin SOT143 Package
_______________Ordering Information
PART*
AMS811_EUS-T
AMS812_EUS-T
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
4 SOT143
________________________Applications
Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
4 SOT143
*This
part offers a choice of five different reset threshold volt-
ages. Select the letter corresponding to the desired nominal
reset threshold voltage, and insert it into the blank to complete
the part number.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
RESET THRESHOLD
SUFFIX
L
M
T
S
R
VOLTAGE (V)
4.63
4.38
3.08
2.93
2.63
___________Typical Operating Circuit
V
CC
V
CC
V
CC
___________________Pin Configuration
TOP VIEW
GND
1
4
V
CC
AMS811
AMS812
MR
GND
RESET
(RESET)
μP
RESET
INPUT
(RESET) RESET
GND
2
AMS811
AMS812
3
MR
SOT143
PUSHBUTTON
SWITCH
( ) ARE FOR
A
MS812
( ) ARE FOR
A
MS812
NOTE: SEE LAST PAGE FOR MARKING INFORMATION.
1
Advanced Monolithic Systems
http://www.ams-semitech.com