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SP703EN Datasheet(PDF) 13 Page - Sipex Corporation

Part # SP703EN
Description  Low Power Microprocessor Supervisory with Battery Switch-Over
PDF  16 Pages
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP703EN Datasheet(HTML) 13 Page - Sipex Corporation

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SP703/704DS/07
SP703/704 Low Power Microprocessor Supervisory
© Copyright 2000 Sipex Corporation
13
Interfacing to Microprocessors with
Bidirectional Reset Pins
Microprocessors with bidirectional reset pins,
such as the Motorola 68HC11 series, can
contend with this series' RESET output. If, for
example, the RESET output is driven high and
the
µP wants to pull it low, indeterminate logic
levels may result. To correct this, connect a
4.7K
Ω resistor between the RESET output and
the
µP reset I/O, as in Figure 16. Buffer the
RESET output to other system components.
Figure 15. Monitoring a Negative Voltage
Figure 16. Interfacing to Microprocessors with
Bidirectional RESET I/O
PFI
PFO
R2
R1
VCC
+5V
GND
PFO
V-
+5V
*VTRIP 0V
0V
5.0 - 1.25
R1
1.25 - VTRIP
R2
V-
=
*VTRIP is a negative voltage
VCC
+5V
GND
VCC
+5V
GND
RESET
RESET
4.7K
Ω
µP
Buffered RESET connects to System Components



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