MAX6747KA46/V+T Maxim Integrated, MAX6747KA46/V+T Datasheet - Page 5
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MAX6747KA46/V+T
Manufacturer Part Number
MAX6747KA46/V+T
Description
Supervisory Circuits Single uPower Supervisor
Manufacturer
Maxim Integrated
Series
MAX6746, MAX6747, MAX6748, MAX6749, MAX6750, MAX6751, MAX6752, MAX6753r
Datasheet
1.MAX6747KA46VT.pdf
(14 pages)
Specifications of MAX6747KA46/V+T
Rohs
yes
Number Of Voltages Monitored
1
Monitored Voltage
1.575 V to 5 V
Output Type
Active Low, Open Drain
Manual Reset
Resettable
Watchdog
Watchdog
Battery Backup Switching
No Backup
Supply Voltage - Max
5.5 V
Chip Enable Signals
No
Maximum Power Dissipation
714 mW
Power Fail Detection
No
Supply Current (typ)
5 uA
Supply Voltage - Min
1 V
(V
CC
MAX6746
MAX6747
27.0
26.6
26.2
25.8
25.4
25.0
= +5V, T
—
—
1
2
3
4
-50
V
µP Reset Circuits with Capacitor-Adjustable
CC
vs. TEMPERATURE (V
-25
FALLING AT 1mV/μs
A
= +25°C, unless otherwise noted.)
V
CC
0
MAX6748–
MAX6751
TEMPERATURE (°C)
TO RESET DELAY
_______________________________________________________________________________________
PIN
25
—
—
1
2
3
4
50
CC
75
FALLING)
MAX6752
MAX6753
100
—
—
1
2
3
4
125
Reset/Watchdog Timeout Delay
RESET IN
0.60
0.56
0.52
0.48
0.44
0.40
Typical Operating Characteristics (continued)
NAME
SET0
GND
SWT
SRT
MR
1.5
TIMEOUT PERIOD vs. SUPPLY VOLTAGE
C
SWT
2.0
= C
2.5 3.0 3.5
RESET AND WATCHDOG
SRT
Manual Reset Input. Pull MR low to manually reset the device. Reset
remains asserted for the reset timeout period after MR is released.
Reset Input. High-impedance input to the adjustable reset comparator.
Connect RESET IN to the center point of an external resistor-divider to
set the threshold of the externally monitored voltage.
Logic Input. SET0 selects watchdog window ratio or disables the
watchdog timer. See Table 1.
Watchdog Timeout Input.
MAX6746–MAX6751: Connect a capacitor between SWT and ground to
set the basic watchdog timeout period (t
the formula t
Farads. Extend the basic watchdog timeout period by using the WDS
input. Connect SWT to ground to disable the watchdog timer function.
MAX6752/MAX6753: Connect a capacitor between SWT and ground to
set the slow watchdog timeout period (t
watchdog period by the formula: t
seconds and C
by pinstrapping SET0 and SET1 (Connect SET0 high and SET1 low to
disable the watchdog timer function.) See Table 1.
Reset Timeout Input. Connect a capacitor from SRT to GND to select
the reset timeout period. Determine the period as follows: t
10
Ground
= 100pF
6
x C
V
SRT
CC
(V)
4.0 4.5
with t
WD
SWT
= 5.06 x 10
RP
5.0
in seconds and C
in Farads. The fast watchdog timeout period is set
5.5
6.0
6
x C
FUNCTION
SWT
9.0
8.5
8.0
7.5
7.0
6.5
6.0
WD2
1.5
with t
SRT
C
= 0.65 x 10
SWT
WD2
RESET AND WATCHING TIMEOUT
2.0
WD
PERIOD vs. SUPPLY VOLTAGE
in Farads.
= C
WD
2.5
). Determine the period by
). Determine the slow
SRT
Pin Description
in seconds and C
= 1500pF
3.0
9
3.5
x C
V
CC
(V)
SWT
4.0
WATCHDOG
4.5
RP
with t
RESET
= 5.06 x
5.0
SWT
WD2
5.5
in
in
6.0
5