MAX6886 データシートの表示（PDF） - Maxim Integrated
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MAX6886 Datasheet PDF : 13 Pages
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Pin-Selectable, Hex Power-Supply
Supervisory Circuit
Typical Operating Characteristics (continued)
(VIN1–VIN4 or VCC = 5V, WDI = GND, TH0–TH4 = MARGIN = MR = DBP, TA = +25°C, unless otherwise noted.)
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)
RESET TIMEOUT PERIOD vs. TEMPERATURE
(CRST = 0.047µF)
200
190
180
170
160
150
140
130
120
110
100
-40 -15
10
35
60
85
TEMPERATURE (°C)
WATCHDOG TIMEOUT PERIOD
vs. TEMPERATURE (CSWT = 0.33µF)
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
-40 -15
10
35
60
85
TEMPERATURE (°C)
RESET TIMEOUT PERIOD vs. CSRT
10,000
WATCHDOG TIMEOUT PERIOD vs. CSWT
10,000
1000
1000
100
100
10
10
1
1
0.1
0.1
1
10
100
1000
CSRT (nF)
0.1
0.1
1
10
100
1000
CSWT (nF)
Pin Description
PIN
NAME
FUNCTION
Open-Drain, Active-Low Reset Output. RESET asserts when any input voltage falls below the selected
1
RESET
threshold, the watchdog timer expires, or when MR is pulled low. RESET remains asserted for default
(200ms) or adjustable reset timeout period after all assertion-causing conditions are cleared. An
external pullup resister is required.
Reset Timeout Adjust Input. Connect an external capacitor between SRT and GND to set the reset
2
SRT
timeout period. The timeout period is calculated by tRP = 4.348E6 x CSRT (tRP in seconds and CSRT in
Farads). To use the factory default period of 200ms connect SRT to VCC.
Watchdog Timeout Adjust Input. Connect an external capacitor between SWT and GND to set the
3
SWT
watchdog timeout period. The adjustable timeout period is calculated by tWD = 4.348E6 x CSWT (tWD
in seconds and CSWT in Farads). Disable the watchdog timer by connecting SWT to GND. Connect
SWT to VCC to use the factory-default normal and initial periods of 1.6s and 102.4s, respectively.
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