MAX6887 データシートの表示（PDF） - Maxim Integrated
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MAX6887 Datasheet PDF : 13 Pages
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Hex/Quad, Power-Supply Supervisory Circuits
Typical Operating Characteristics (continued)
(VIN1–VIN4 or VCC = 5V, WDI = GND, MARGIN = MR = BP, TA = +25°C, unless otherwise noted.)
IN_ TO RESET OR OV
PROPAGATION DELAY vs. TEMPERATURE
30
100mV OVERDRIVE
29
28
27
26
25
24
23
22
21
20
-40 -15
10
35
60
85
TEMPERATURE (°C)
WATCHDOG TIMEOUT PERIOD
vs. TEMPERATURE
1.700
1.675
1.650
1.625
1.600
1.575
1.550
1.525
1.500
-40 -15
10
35
60
85
TEMPERATURE (°C)
NORMALIZED IN_ THRESHOLD
vs. TEMPERATURE
1.005
1.004
1.003
1.002
1.001
1.000
0.999
0.998
0.997
0.996
0.995
-40 -15
10
35
60
85
TEMPERATURE (°C)
MAXIMUM IN_ TRANSIENT
vs. IN_THRESHOLD OVERDRIVE
200
175
150
125
100
PO_ ASSERTION OCCURS
75
ABOVE THIS LINE
50
25
0
1
10
100
1000
IN_ THRESHOLD OVERDRIVE (mV)
OUTPUT-VOLTAGE LOW vs. SINK CURRENT
400
350
300
250
200
150
100
50
0
02
4 6 8 10 12 14
SINK CURRENT (mA)
MR TO RESET OUTPUT PROPAGATION
DELAY vs. TEMPERATURE
3.00
2.75
2.50
2.25
2.00
1.75
1.50
1.25
1.00
-40 -15
10
35
60
85
TEMPERATURE (°C)
Pin Description
PIN
MAX6887 MAX6888
1
1
NAME
RESET
FUNCTION
Open-Drain, Active-Low Reset Output. RESET asserts when any input voltage falls below its
undervoltage threshold or when MR is pulled low. RESET remains low for 200ms after all
assertion-causing conditions are cleared. An external pullup resister is required.
Open-Drain, Active-Low Watchdog Timer Output. Logic output for the watchdog timer function.
2
2
WDO WDO goes low when WDI is not strobed high-to-low or low-to-high within the watchdog timeout
period.
Open-Drain Active-Low Overvoltage Output. OV asserts when any input voltage exceeds its
3
3
OV overvoltage threshold. OV remains low for 25µs after all overvoltage conditions are cleared.
An external pullup resistor is required.
4
4
GND Ground
4 _______________________________________________________________________________________
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