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參數(shù)資料
| 型號(hào)： | LM3706 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Microprocessor Supervisory Circuits with Low Line Output and Watchdog Timer |
| 中文描述： | 微處理器監(jiān)控電路低線路輸出和看門狗定時(shí)器 |
| 文件頁(yè)數(shù)： | 6/11頁(yè) |
| 文件大小： | 217K |
| 代理商： | LM3706 |
LM3706/LM3707 Series Electrical Characteristics
(Continued)
Limits in the standard typeface are for T
J
= 25C and limits in
boldface type
apply over full operating range. Unless otherwise
specified: V
CC
= +2.2V to 5.5V.
Symbol
Parameter
Conditions
WDI
Watchdog Input
Current
WDI
T
Watchdog Input
Threshold
t
WD
Watchdog
Timeout Period
Watchdog Timeout Period = J, K, L, M
Watchdog Timeout Period = N, P, Q, R
Watchdog Timeout Period = S, T, U, V
LLO
V
OL
LLO Output
Voltage
V
CC
>
2.7V, I
SINK
= 1.2mA
V
CC
>
4.5V, I
SINK
= 3.2mA
V
OH
V
CC
>
2.7V, I
SOURCE
= 500μA
V
CC
>
4.5V, I
SOURCE
= 800μA
LLO OUTPUT
V
LLOT
LLO Output
Threshold
(V
LLO
V
RST
, V
CC
falling)
V
LLOTH
Low-Line
Comparator
Hysteresis
t
CD
Low-Line
Comparator Delay
Min
1
Typ
Max
+1
Units
μA
0.2
V
CC
1.225
0.8
V
CC
V
Watchdog Timeout Period = E, F, G, H
4.3
71
1120
17900
6.2
102
1600
25600
9.3
153
2400
38400
ms
V
CC
>
2.25V, I
SINK
= 900μA
0.3
0.3
0.4
V
V
CC
>
2.25V, I
SOURCE
= 300μA
0.8 V
CC
0.8 V
CC
V
CC
1.5V
1.01
V
RST
1.02
V
RST
1.03
V
RST
V
0.0032
V
RST
mV
V
CC
falling at 1mV/μs
20
μs
Note 1: Absolute Maximum Ratings
indicate limits beyond which damage to the device may occur.
Operating Ratings
indicate conditions for which the device
is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the
listed conditions.
Note 2:
The Human Body model is a 100 pF capacitor discharged through a 1.5 k
resistor into each pin. The machine model is a 200pF capacitor discharged
directly into each pin.
Note 3:
The maximum allowable power dissipation is a function of the maximum junction temperature, T
J
(MAX), the junction-to-ambient thermal resistance,
θ
J-A
,
and the ambient temperature, T
A
. The maximum allowable power dissipation at any ambient temperture is calculated using:
Where the value of
θ
J-A
for the micro SMD package is 220C/W.
L
www.national.com
6
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