MC34161D ON Semiconductor, MC34161D Datasheet - Page 12

• Manufacturer Part Number: MC34161D
• Description: IC MONITOR VOLTAGE UNIV 8SOIC
• Manufacturer: ON Semiconductor
• Type: Multi-Voltage Supervisorr

Specifications of MC34161D

• Number Of Voltages Monitored: 2
• Output: Open Drain or Open Collector
• Voltage - Threshold: Adjustable/Selectable
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Reset: -
• Reset Timeout: -

The above figure shows the MC34161 configured as an overvoltage detector with an audio alarm. Channel 1 monitors input voltage V
as a simple RC oscillator. As the input voltage increases from ground, the output of channel 1 allows the oscillator to turn ‘ON’ when V
For known resistor values, the voltage trip points are:
The above figure shows the MC34161 configured as a microprocessor reset with a time delay. Channel 2 monitors input voltage V
time delay function. As the input voltage decreases towards ground, the output of channel 2 quickly discharges C
increases from ground, the output of channel 2 allows R
For known resistor values, the voltage trip points are:
For known R
Input V
Output
Voltage
Pins 5, 6
Input V
Output
Voltage
Pin 5
Output
Voltage
Pin 6
V
V
1
1
+ (V
+ (V
S
S
GND
GND
th
GND
GND
GND
th
V
V
V
DLY
* V
* V
V
V
CC
V
V
CC
CC
2
1
2
1
C
H
H
DLY
)
)
R
R
R
R
values, the reset time delay is:
2
1
2
1
) 1 V
) 1
V
2
2
+ V
+ V
th
th
R
R
R
R
2
1
Figure 24. Overvoltage Detector with Audio Alarm
Figure 25. Microprocessor Reset with Time Delay
2
1
V
) 1
Reset LED `ON'
V
Hys
) 1
Hys
Osc `ON'
DLY
to charge C
t
t
DLY
DLY
http://onsemi.com
= R
DLY
DLY
C
when V
DLY
12
In
S
For a specific trip voltage, the required resistor ratio is:
exceeds V
For a specific trip voltage, the required resistor ratio is:
R
R
R
R
1 −
2
1
2
1
R
R
+
+
2
1
1
V
V
V
V
CC
S
V
th
2
R
R
th
.
th
2
1
V
* V
V
V
* V
C
1
1
S
T
C
1
7
2
3
H
H
DLY
* 1
* 1
+
+
1
7
2
3
1.27V
1.27V
+
-
+
-
+
+
DLY
R
R
R
R
R
1.27V
1.27V
B
2
1
when V
+
-
+
-
2
1
+
+
Reference
+
+
4
V
V
2.54V
V
V
th
2
th
0.6V
2
2.8V
S
-
+
-
+
Reference
* 1
+
+
* 1
falls below V
4
8
V
2.54V
CC
0.6V
2.8V
S
-
+
-
+
S
8
V
while channel 1 performs the
while channel 2 is connected
CC
S
exceeds V
1
. As the input voltage
6
5
2
R
6
5
.
R
A
3
Piezo
R
DLY