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MAX825SEUK Datasheet(PDF) 11 Page - Micrel Semiconductor

Part # MAX825SEUK
Description  Voltage Supervisor with Watchdog Timer and Manual Reset
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MAX825SEUK Datasheet(HTML) 11 Page - Micrel Semiconductor

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Micrel, Inc.
MAX823/4/5
January 14, 2014
11
Revision 1.0
Watchdog Input
The MAX823/4 has an on-chip watchdog timer that can
reset the microprocessor if it fails to strobe the WDI input
within a preset timeout period (tWD). If the WDI pin is left
unconnected, this function is disabled. The watchdog
timeout period starts when the reset outputs
are
deasserted
or
either
a
high-to-low
or
low-to-high
transition occurs before the watchdog timeout period
(tWD). If the watchdog timer times out, then the reset
outputs will assert and stay asserted for a reset timeout
period (tRP). The watchdog timer is also cleared whenever
the reset outputs are asserted by /MR, or if VCC falls
below VRST. The watchdog timer starts again whenever
the reset outputs are de-asserted.
Figure 3. Watchdog Input
Watchdog Input Current
The WDI input current is the current sourced or sinked by
the WDI pin when the WDI input is driven low or high,
respectively. The WDI input is designed to drive a tri-
state output device with a 10µA maximum leakage
current and a maximum capacitance of 200pF.
VCC Transient
The MAX823/4/5 is relatively immune to small negative-
going VCC glitches below the reset threshold. As shown in
Figure 4, the overdrive voltage is the difference between
the threshold voltage and the minimum point of the VCC
glitch. Typically, an overdrive of 100mV with duration of
2
μs or less will not cause a reset.
Figure 4. VCC Transient
Reset Valid up to VCC = 1V
The MAX823/4/5 is a supervisory circuit that monitors the
power supply voltage level. If the power supply voltage
level falls below the factory-programmed threshold level,
then the reset signals are asserted. The MAX823/4/5
maintains the reset states with VCC as low as 1V.
Supply Bypass Capacitor
An optional 0.1µF input bypass capacitor can be placed
from VCC (Pin 6) to GND (Pin 2) to increase glitch
rejection and provides additional transient immunity.


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