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MAX6358LSUK-T Datasheet(PDF) 7 Page - Maxim Integrated Products

Part # MAX6358LSUK-T
Description  Dual/Triple-Voltage 關P Supervisory Circuits
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX6358LSUK-T Datasheet(HTML) 7 Page - Maxim Integrated Products

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Watchdog Input
(MAX6358/MAX6359/MAX6360)
The MAX6358/MAX6359/MAX6360 include a WDI to
provide a reset if the µP goes into an infinite loop. After
a reset, the start-up timeout period and the initial time-
out period is nominally 46.4sec to allow the µP time to
initialize. After the first transition on the WDI and after
any toggle of the watchdog thereafter, the timeout peri-
od is nominally 2.9sec.
Applications Information
Ensuring a Valid
RESET Output
Down to VCC = 0
In some systems, it is necessary to ensure a valid reset
even if VCC falls to 0. In these applications, use the cir-
cuit shown in Figure 3. Note that this configuration does
not work for the open-drain outputs of the MAX6352/
MAX6355/MAX6358.
Monitoring a Negative Voltage
To monitor a negative supply rail using RSTIN or the
MAX6355/MAX6356/MAX6357, use the circuit shown in
Figure 4. In this configuration, a reset is issued when
the negative supply falls below VINTH.
Interfacing to µPs with
Bidirectional Reset Pins
Microprocessors with bidirectional reset pins will con-
tend with the push-pull outputs of these devices. To
prevent this, connect a 4.7k
Ω resistor between RESET
and the µP’s reset I/O port, as shown in Figure 5. Buffer
RESET as shown in the figure if this reset is used by
other components in the system.
Dual/Triple-Voltage
µP Supervisory Circuits
_______________________________________________________________________________________
7
Figure 4. Monitoring a Negative Voltage
Figure 3. Ensuring a Valid Reset Low to VCC5 and VCC3 = 0
+3.3V/+3V +5V
GND
100k
RST3
RST5
RST
MAX6351–MAX6360
VCC3
VCC5
VCC5
VIN
R1
R2
RSTIN
MAX6355
MAX6356
MAX6357
VCC5 ≥ VRSTIN
VINTH = 1.22 -
(VCC5 - 1.22)
R2
R1
R2
VINR1
VCC5 ≥ -
Figure 5. Interfacing to µPs with Bidirectional Reset I/O
BUFFERED RESET TO OTHER SYSTEM COMPONENTS
4.7k
GND
RESET
µP
GND
RST3
RST5
RST
MAX6351–MAX6360
VCC3
VCC3
VCC5
VCC5
Chip Information
TRANSISTOR COUNT: 855


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