DS1815R-5-U+ Maxim Integrated, DS1815R-5-U+ Datasheet - Page 5

• Manufacturer Part Number: DS1815R-5-U+
• Description: Supervisory Circuits
• Manufacturer: Maxim Integrated
• Series: DS1815r

Specifications of DS1815R-5-U+

• Number Of Voltages Monitored: 1
• Monitored Voltage: 0 V to 5.5 V
• Undervoltage Threshold: 2.98 V
• Overvoltage Threshold: 3.15 V
• Output Type: Active Low, Push-Pull
• Manual Reset: Not Resettable
• Watchdog: No Watchdog
• Battery Backup Switching: No Backup
• Power-up Reset Delay (typ): 250 ms
• Supply Voltage - Max: 5.5 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOT-23
• Chip Enable Signals: No
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: Yes
• Supply Current (typ): 35 uA
• Supply Voltage - Min: 0 V
• Part # Aliases: 90-1815R+U05

(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