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LM3712 Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM3712
Description  Microprocessor Supervisory Circuits with Separate Watchdog Timer Output, Power Fail Input and Manual Reset
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM3712 Datasheet(HTML) 6 Page - National Semiconductor (TI)

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LM3712/LM3713 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
PFI/MR
V
PFT
PFI Input
Threshold
1.200
1.225
1.250
V
V
MRT
MR Input
Threshold
MR, Low
0.8
V
MR, High
2.0
V
PFTH/
V
MRTH
PFI/MR Threshold
Hysteresis
PFI/MR falling: V
CC =VRST MAX to 5.5V
0.0032
V
RST
mV
I
PFI
Input Current (PFI
only)
−75
75
nA
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
PFO, WDO
V
OL
PFO, WDO
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
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