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SP813LEU Datasheet(PDF) 10 Page - Sipex Corporation

Part # SP813LEU
Description  Low Power Microprocessor Supervisory Circuits
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP813LEU Datasheet(HTML) 10 Page - Sipex Corporation

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SP705DS/09
SP705 Low Power Microprocessor Supervisory Circuits
© Copyright 2000 Sipex Corporation
10
Typically, WDO will be connected to the
non-maskable interrupt input (NMI) of a
µP.
When V
CC drops below the reset threshold,
WDO will go LOW whether or not the watch-
dog timer has timed out. Normally this would
trigger an NMI but RESET goes LOW simulta-
neously, and thus overrides the NMI.
If WDI is left unconnected, WDO can be used as
a low-line output. Since floating WDI disables
the internal timer, WDO goes LOW only when
V
CC falls below the reset threshold, thus func-
tioning as a low-line output.
Figure 14. SP705/706/813L/813M Watchdog Timing Waveforms
Figure 15. SP705/706 Timing Diagrams with WDI Tri-stated. The SP707/708/813L/813M RESET Output is the Inverse
of the RESET Waveform Shown.
tRS
RESET*
WDO
0V
+5V
WDI
RESET*
0V
+5V
0V
+5V
0V
+5V
tWD
tWD
tWD
tWP
* externally triggered LOW by MR,
RESET is for the SP813L/813M only
VCC
RESET
0V
+5V
0V
+5V
0V
+5V
tRS
tRS
tMR
0V
+5V
MR*
WDO
VRT
VRT
*externally driven LOW
tMD


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