MAX6412UK18-T Maxim Integrated, MAX6412UK18-T Datasheet - Page 8

• Manufacturer Part Number: MAX6412UK18-T
• Description: Supervisory Circuits
• Manufacturer: Maxim Integrated
• Series: MAX6412, MAX6413, MAX6414, MAX6415, MAX6416, MAX6417, MAX6418, MAX6419, MAX6420r

Specifications of MAX6412UK18-T

• Number Of Voltages Monitored: 1
• Monitored Voltage: 1.6 V to 5 V
• Undervoltage Threshold: 1.755 V
• Overvoltage Threshold: 1.845 V
• Output Type: Active Low, Push-Pull
• Manual Reset: Resettable
• Watchdog: No Watchdog
• Battery Backup Switching: No Backup
• Power-up Reset Delay (typ): 5.4 ms
• Supply Voltage - Max: 5.5 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: SOT-23
• Chip Enable Signals: No
• Maximum Power Dissipation: 571 mW
• Minimum Operating Temperature: - 40 C
• Power Fail Detection: No
• Supply Current (typ): 2.7 uA
• Supply Voltage - Min: 1 V

The open-drain outputs of the MAX6414/MAX6417/
MAX6420 can be used to interface to µPs with other
logic levels. As shown in Figure 5, the open-drain out-
put can be connected to voltages from 0 to 5.5V. This
allows for easy logic compatibility to various micro-
processors.
In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, these supervisors
are relatively immune to short-duration negative-going
transients (glitches). The Maximum Transient Duration vs.
Reset Threshold Overdrive graph in the Typical
Operating Characteristics shows this relationship.
The area below the curve of the graph is the region in
which these devices typically do not generate a reset
pulse. This graph was generated using a negative-
going pulse applied to V
reset threshold (V
tude indicated (reset-threshold overdrive). As the mag-
nitude of the transient decreases (farther below the
reset threshold), the maximum allowable pulse width
decreases. Typically, a V
below the reset threshold and lasts 50µs or less will not
cause a reset pulse to be issued.
When V
ing (sourcing) capabilities decline drastically. In the
case of the MAX6412, MAX6415, and MAX6418, high-
Low-Power, Single/Dual-Voltage µP Reset Circuits
with Capacitor-Adjustable Reset Timeout Delay
MAX6412–MAX6420
Figure 5. MAX6414/MAX6417/MAX6420 Open-Drain RESET
Output Allows use with Multiple Supplies
8
Interfacing to Other Voltages for Logic
MAX6414
MAX6417
MAX6420
CC
falls below 1V, RESET/RESET current sink-
Ensuring a Valid RESET or RESET
Negative-Going V
3.3V
V
CC
TH
) and ending below it by the magni-
GND
RESET
CC
CC
, starting above the actual
10kΩ
transient that goes 100mV
Down to V
CC
Compatibility
Transients
5V SYSTEM
5.0V
CC
= 0V
impedance CMOS-logic inputs connected to RESET
can drift to undetermined voltages. This presents no
problems in most applications, since most µPs and
other circuitry do not operate with V
In those applications where RESET must be valid down
to 0, adding a pulldown resistor between RESET and
ground sinks any stray leakage currents, holding
RESET low (Figure 6). The value of the pulldown resis-
tor is not critical; 100kΩ is large enough not to load
RESET and small enough to pull RESET to ground. For
applications using the MAX6413, MAX6416, and
MAX6419, a 100kΩ pullup resistor between RESET and
V
(Figure 7). Open-drain RESET versions are not recom-
mended for applications requiring valid logic for V
down to 0V.
Figure 6. Ensuring RESET Valid to V
Figure 7. Ensuring RESET Valid to V
CC
will hold RESET high when V
MAX6412
MAX6415
MAX6418
MAX6413
MAX6416
MAX6419
GND
GND
RESET
RESET
V
CC
V
CC
CC
CC
= 0V
= 0V
V
CC
CC
V
CC
CC
below 1V.
100kΩ
100kΩ
falls below 1V
Maxim Integrated
CC