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LM3709 Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM3709
Description  Microprocessor Supervisory Circuits with Low Line Output, Manual Reset and Watchdog Timer
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM3709 Datasheet(HTML) 6 Page - National Semiconductor (TI)

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LM3708/LM3709 Series Electrical Characteristics (Continued)
Limits in the standard typeface are for T
J = 25˚C and limits in boldface type apply over full operating range. Unless otherwise
specified: V
CC = +2.2V to 5.5V.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
WDI
WDI
Watchdog Input
Current
−1
+1
µA
WDI
T
Watchdog Input
Threshold
0.2
V
CC
1.225
0.8
V
CC
V
t
WD
Watchdog
Timeout Period
Watchdog Timeout Period = E, F, G, H
Watchdog Timeout Period = J, K, L, M
Watchdog Timeout Period = N, P, Q, R
Watchdog Timeout Period = S, T, U, V
4.3
71
1120
17900
6.2
102
1600
25600
9.3
153
2400
38400
ms
MR
V
MRT
MR Input
Threshold
MR, Low
0.8
V
MR, High
2.0
V
MRTH
MR Threshold
Hysteresis
MR falling: V
CC =VRST MAX to 5.5V
0.0032
V
RST
mV
R
MR
MR Pull-up
Resistance
35
56
75
k
t
MD
MR to Reset
Delay
12
µS
t
MR
MR Pulse Width
25
µS
LLO
V
OL
LLO Output
Voltage
V
CC > 2.25V, ISINK = 900µA
0.3
V
V
CC > 2.7V, ISINK = 1.2mA
0.3
V
CC > 4.5V, ISINK = 3.2mA
0.4
V
OH
V
CC > 2.25V, ISOURCE = 300µA
0.8 V
CC
V
CC > 2.7V, ISOURCE = 500µA
0.8 V
CC
V
CC > 4.5V, ISOURCE = 800µA
V
CC − 1.5V
LLO OUTPUT
V
LLOT
LLO Output
Threshold
(V
LLO −VRST,VCC
falling)
1.01
V
RST
1.02
V
RST
1.03
V
RST
V
V
LLOTH
Low-Line
Comparator
Hysteresis
0.0032
V
RST
mV
t
CD
Low-Line
Comparator Delay
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
Ω 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, TJ(MAX), the junction-to-ambient thermal resistance, θJ-A,
and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperture is calculated using:
Where the value of
θJ-A for the micro SMD package is 220˚C/W.
www.national.com
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