DS1818R-20-U Maxim Integrated Products, DS1818R-20-U Datasheet - Page 2
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DS1818R-20-U
Manufacturer Part Number
DS1818R-20-U
Description
Supervisory Circuits 3.3V EconoReset w/Pushbutton
Manufacturer
Maxim Integrated Products
Datasheet
1.DS1818R-10TR.pdf
(5 pages)
Specifications of DS1818R-20-U
Number Of Voltages Monitored
1
Monitored Voltage
1 V to 5.5 V
Undervoltage Threshold
2.47 V
Overvoltage Threshold
2.64 V
Output Type
Active Low, Open Drain
Manual Reset
Resettable
Watchdog
No Watchdog
Battery Backup Switching
No Backup
Power-up Reset Delay (typ)
250 ms
Supply Voltage (max)
5.5 V
Supply Voltage (min)
1 V
Supply Current (typ)
35 uA
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SOT-23-3L
Minimum Operating Temperature
- 40 C
Power Fail Detection
Yes
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
OPERATION - POWER MONITOR
The DS1818 provides the functions of detecting out-of-tolerance power supply conditions and warning a
processor-based system of impending power failures. When V
signal is asserted. On power-up,
reached the selected tolerance. This allows the power supply and microprocessor to stabilize before
is released.
BLOCK DIAGRAM (OPEN-DRAIN OUTPUT) Figure 1
APPLICATION EXAMPLE Figure 2
OPERATION - PUSHBUTTON RESET
The DS1818 provides a pushbutton switch for manual reset control. When the DS1818 is not in a reset
cycle, a pushbutton reset can be generated by pulling the
pushbutton is held low, the
the pushbutton is released. See Figure 2 for an application example and Figure 3 for the timing diagram.
TIMING DIAGRAM: PUSHBUTTON RESET Figure 3
RST
RST
is forced active low and will remain active low for about 150 ms after
is kept active for approximately 150 ms after the power supply has
2 of 5
RST
CC
is detected as out-of-tolerance, the
pin low for at least 1 ms. When the
DS1818
RST
RST