Datasheet
MAX6886
Pin-Selectable, Hex Power-Supply
Supervisory Circuit
_______________________________________________________________________________________
5
PROPAGATION DELAY (µs)
1.25
1.50
1.75
2.00
2.50
2.25
2.75
3.00
1.00
MR TO RESET OUTPUT PROPAGATION
DELAY vs. TEMPERATURE
MAX6886 toc09
TEMPERATURE (
°
C)
603510-15-40 85
RESET TIMEOUT PERIOD vs. TEMPERATURE
(C
RST
= 0.047µF)
TIMEOUT PERIOD (ms)
110
120
130
140
150
160
170
180
190
200
100
MAX6886 toc10
TEMPERATURE (
°
C)
603510-15-40 85
WATCHDOG TIMEOUT PERIOD
vs. TEMPERATURE (C
SWT
= 0.33µF)
TIMEOUT PERIOD (s)
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
1.0
MAX6886 toc11
TEMPERATURE (
°
C)
603510-15-40 85
Typical Operating Characteristics (continued)
(V
IN1
–V
IN4
or V
CC
= 5V, WDI = GND, TH0–TH4 = MARGIN = MR = DBP, T
A
= +25°C, unless otherwise noted.)
RESET TIMEOUT PERIOD vs. C
SRT
MAX6886 toc12
C
SRT
(nF)
TIMEOUT PERIOD (ms)
100101
1
10
100
1000
10,000
0.1
0.1 1000
WATCHDOG TIMEOUT PERIOD vs. C
SWT
MAX6886 toc13
C
SWT
(nF)
TIMEOUT PERIOD (ms)
100101
1
10
100
1000
10,000
0.1
0.1 1000
Pin Description
PIN NAME FUNCTION
1 RESET
Open-Drain, Active-Low Reset Output. RESET asserts when any input voltage falls below the selected
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.
2 SRT
Reset Timeout Adjust Input. Connect an external capacitor between SRT and GND to set the reset
timeout period. The timeout period is calculated by t
RP
= 4.348E6 x C
SRT
(t
RP
in seconds and C
SRT
in
Farads). To use the factory default period of 200ms connect SRT to V
CC
.
3SWT
Watchdog Timeout Adjust Input. Connect an external capacitor between SWT and GND to set the
watchdog timeout period. The adjustable timeout period is calculated by t
WD
= 4.348E6 x C
SWT
(t
WD
in seconds and C
SWT
in Farads). Disable the watchdog timer by connecting SWT to GND. Connect
SWT to V
CC
to use the factory-default normal and initial periods of 1.6s and 102.4s, respectively.