SP703 SIPEX [Sipex Corporation], SP703 Datasheet - Page 13

• Manufacturer Part Number: SP703
• Description: Low Power Microprocessor Supervisory with Battery Switch-Over
• Manufacturer: SIPEX [Sipex Corporation]

Figure 15. Monitoring a Negative Voltage
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 P wants to pull it low, indeterminate logic
levels may result. To correct this, connect a
4.7K resistor between the RESET output and
the P reset I/O, as in Figure 16. Buffer the
RESET output to other system components.
SP703/704DS/07
+5V
V
GND
CC
PFO
PFI
5.0 - 1.25
*V
*V
R
1
TRIP
TRIP
PFO
is a negative voltage
0V
+5V
0V
=
1.25 - V
R
2
SP703/704 Low Power Microprocessor Supervisory
TRIP
V-
V-
R
R
2
1
13
Figure 16. Interfacing to Microprocessors with
Bidirectional RESET I/O
Buffered RESET connects to System Components
+5V
GND
V
CC
RESET
4.7K
© Copyright 2000 Sipex Corporation
RESET
+5V
P
GND
V
CC