Datasheet

MAX6886
Pin-Selectable, Hex Power-Supply
Supervisory Circuit
_______________________________________________________________________________________ 3
Note 1: Device may be supplied from IN1–IN4 or V
CC
.
Note 2: 100% production tested at T
A
= +25°C and T
A
= +85°C. Specifications at T
A
= -40°C are guaranteed by design.
Note 3: The internal supply voltage, measured at V
CC
, equals the maximum of IN1–IN4.
Note 4: External capacitor is charged by I
S_T
when V
S_T-DIS
< V
S_T
< V
S_T-ADJ
.
Note 5: External capacitor is discharged by I
S_T-DIS
down to V
S_T-DIS
after V
S_T
reaches V
S_T-ADJ
.
ELECTRICAL CHARACTERISTICS (continued)
(V
IN1
–V
IN4
or V
CC
= 2.7V to 5.8V, WDI = GND, TH0–TH4 = MARGIN = MR = DBP, T
A
= -40°C to +85°C, unless otherwise noted.
Typical values are at T
A
= +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
IL
0.6
MR, MARGIN, TH0–TH4, WDI
Input Voltage
V
IH
1.4
V
MR Input Pulse Width t
MR
1µs
MR Glitch Rejection
100
ns
MR to RESET Delay t
D-MR
200
ns
MR to Internal DBP Pullup
Current
I
MR
V
MR
= 1.4V 5 10 15 µA
MARGIN to Internal DBP Pullup
Current
I
MARGIN
V
MARGIN
= 1.4V 5 10 15 µA
TH0–TH4 Input Current
-100 +100
nA
WDI Pulldown Current I
WDI
V
WDI
= 0.6V 5 10 15 µA
WDI Input Pulse Width t
WDI
50 ns
Initial mode
92.16 102.4 112.64
Watchdog Default Timeout Period
t
WD
V
SWT
= V
CC
Normal mode
1.44
1.6
1.76
s
Initial mode
53.7 82.5 111.9
Watchdog Adjustable Timeout
Period
t
WD-ADJ
C
SWT
= 0.33µF
Normal mode
0.93 1.43 1.94
s
SWT Adjustable Timeout Current
I
SWT
SWT = GND
180 230 280
nA
SWT Default Timeout Threshold
V
SWT-DEF
V
SWT
≥ V
SWT-DEF
, selects watchdog default
timeout
1.1
1.25
1.5 V
SWT Adjustable Timeout
Threshold
V
SWT-ADJ
(Note 4)
0.95 1.00 1.05
V
SWT Adjustable Timeout
Discharge Threshold
V
SWT-DIS
(Note 5)
100
mV
SWT Adjustable Timeout Output-
Low Discharge Current
I
SWT-DIS
V
SWT
= 0.3V 0.7 mA