IC
3-Pin Microprocessor Reset Monitor
DESCRIPTION & FEATURES
概述及特點
FH809
系列產品具有效率極高的檢測系統集成電
路,設計用於監控數½和混合信號電路中,當供應電
源超出工½範圍時提供一個預先的信號.而且提供一
個
RESET
信號給主處理器,無需外加的器件.
重½輸出電壓在
20uS
內可以關斷當輸入電壓降½
于關斷電壓,若重½電壓要重新維持啟動狀態需在輸
入電壓上升到關斷電壓以上後最小
140mS
時間.器
件可以封裝
SOT-23.
FH809
通過優化可以免去
V
CC
端的瞬間的脈衝干擾,
½靜態電流可達
18uA(V
CC
=3.3V),½器件適合用於
電池電源應用.
電壓檢測積體電路
FH809
The FH809 is a cost-effective system supervisor
Integrated Circuit (IC) designed to monitor V
CC
in digital
and mixed signal systems and provide a warning signal
when the system power supply is out of working range,
and a reset signal to the host processor when necessary.
No external components are required.
The reset output is driven active within 20μsec of V
CC
falling through the reset voltage threshold. Reset is
maintained active for a minimum of 140msec after V
CC
rises above the reset threshold. Devices are available in a
SOT-23 package.
The FH809 is optimized to reject fast transient glitches
on the V
CC
line. Low supply current of 18μA (V
CC
=3.3V)
makes these devices suitable for battery powered
applications.
Precision V
CC
Monitor for 2.8V, 3.0V, 3.3V, and
5.0V Supplies
140msec Guaranteed Minimum RESET Output
Duration
Low 18μA Supply Current
V
CC
Transient Immunity
Small SOT-23 Package
No External Components
Wide Operating Temperature: 0°C to 85°C
精密的
V
CC
電壓監控
2.8V,3.0V,3.3V
和
5.0V
最短重½輸出延遲時間
140mS
½靜態電流
18uA
V
CC
瞬間的脈衝干擾免疫
小封裝：SOT-23
無附加器件
寬工½溫度範圍:
0°C to 85°C
Applications
應用
電腦
植入的系統
電池供應電源設備
緊急的UPS監控
Computers
Embedded systems
Battery powered equipment
Critical
μP
power supply monitoring
Pin Configuration
管腳配½
Pin Description
管腳描述
Pin No.
1
2
3
Symbol
GND
RESET
Vcc
Description
Ground
RESET output remains low while Vcc is below the reset voltage threshold and for
240msec(typ) after Vcc rises above reset threshold
Supply Voltage (typ.)輸入電源
1
IC
3-Pin Microprocessor Reset Monitor
Ordering Information
訂購資訊
Package
封裝類型
Temperature Range
溫度範圍
Part Number
產品型號
FH809L
FH809M
FH809J
SOT-23
0°C ~ 125°C
FH809T
FH809S
FH809R
809T+
work No.
809S+
work No.
809R+
work No.
Tape
Tape
Tape
電壓檢測積體電路
FH809
Marking ID
打標
809L+
work No.
809M+
work No.
809J+
work No.
Packing Type
包裝類型
Tape
Tape
Tape
Type Name
型號½名
FH809 L – E
Type
產品型號
Voltage
電壓
Lead frame
無鉛
见上表
ABSOLUTE MAXIMUM RATINGS (T
a
=25℃)
最大額定值
(Note )
Characteristic
特性參數
Supply Voltage
輸入電壓
output pin voltage
輸出電壓
Input Current輸入電流
Output Current輸出電流
Symbol
符號
V
CC
RESET
Rating
額定值
Min
最小
Max
最大
-0.3
-0.3
Unit
單½
V
V
mA
mA
5.5
V
CC
+ 0.3
Iin
I
OUT
-
-
20
203
Operating Temperature Range
0
°C
Topt
85
工½溫度範圍
Storage Temperature Range
-60
°C
Tstg
150
儲存溫度範圍
Note：Absolute maximum ratings are threshold limit values that must not e exceeded ever for an instant under
any conditions. Moreover, such values for any two items must not be reached simultaneously. Operation
above these absolute maximum ratings may cause degradation or permanent damage to the device. These
are stress ratings only and do not necessarily imply functional operation below these limits.
注意：絕對最大值是一個極限值,在任½情況下即½極短的時間亦不½被超過。而且，任½兩項的絕對值½不½同
時達到極限.任½超越最大值操½,將會引起器件永久損壞。這僅僅是重要的範圍值,½並不意味著所有的功½操½
必須在此極限值下去做。
2
IC
3-Pin Microprocessor Reset Monitor
ELECTRICAL CHARACTERISTICS
電特性
Item
Operating input voltage
工½電壓
Supply Current
輸入電流
電壓檢測積體電路
FH809
Symbol
V
CC
I
CC
Conditions
-
Min.
2.0
-
4.54
3.02
4.63
3.08
4.72
3.14
Typ.
-
-
4.29
2.87
4.38
2.93
4.47
2.99
Max.
5.5
25
3.92
2.58
4.00
2.63
4.08
2.68
Unit
V
µA
V
V
ms
V
V
ms
-
FH809L
FH809M
Reset Threshold
重½電壓極限
FH809J
V
TH
FH809T
FH809S
FH809R
RESET Output Voltage Low
V
OL
I
SINK
= 3mA
-
-
0.4
V
重½輸出電壓½電平
RESET Output Voltage High
I
SOURCE
= 800µA
0.8V
CC
-
-
V
V
OH
重½輸出電壓高電平
Note：considering of variation in process parameters，we compensate for this characteristic related to temperature
by laser-trim，however，this specification is guaranteed by design，not production tested.
注意：以上這些過程參數，是與溫度相關的電參數,僅做設計參考，不為生產測試。
Typical Applications
典型應用圖例
FH809
3
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