Datasheet MC34161DR2, MC33161P, MC33161D, MC33161DR2 Datasheet (MOTOROLA)

MC34161, MC33161

Universal Voltage Monitors

The MC34161/MC33161 are universal voltage monitors intended
for use in a wide variety of voltage sensing applications. These devices
offer the circuit designer an economical solution for positive and
negative voltage detection. The circuit consists of two comparator
channels each with hysteresis, a unique Mode Select Input for channel
programming, a pinned out 2.54 V reference, and two open collector
outputs capable of sinking in excess of 10 mA. Each comparator
channel can be configured as either inverting or noninverting by the
Mode Select Input. This allows over, under, and window detection of
positive and negative voltages. The minimum supply voltage needed
for these devices to be fully functional is 2.0 V for positive voltage
sensing and 4.0 V for negative voltage sensing.

Applications include direct monitoring of positive and negative
voltages used in appliance, automotive, consumer, and industrial
equipment.

• Unique Mode Select Input Allows Channel Programming

• Over, Under, and Window Voltage Detection

• Positive and Negative Voltage Detection

• Fully Functional at 2.0 V for Positive Voltage Sensing and 4.0 V for

Negative Voltage Sensing

• Pinned Out 2.54 V Reference with Current Limit Protection

• Low Standby Current

• Open Collector Outputs for Enhanced Device Flexibility

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MARKING

DIAGRAMS

8

PDIP–8

P SUFFIX

8

1

8

1

CASE 626

SO–8
D SUFFIX
CASE 751

x = 3 or 4
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W= Work Week

MC3x161P

AWL

YYWW

1

8

3x161
ALYW

1

Simplified Block Diagram

(Positive Voltage Window Detector Application)

V

CC

8

1

V

S

7

2

3

+
–

+

1.27V

+
–

+

1.27V

2.54V

Reference

–
+

+

2.8V

–
+

+

0.6V

4

PIN CONNECTIONS

V
Input 1
Input 2

Gnd

1

ref

2
3
4

(TOP VIEW)

V

8

Mode Select

7

Output 1

6

Output 2

5

CC

ORDERING INFORMATION

6

5

Device Package Shipping

MC34161D SO–8 98 Units/Rail
MC34161DR2 SO–8 2500 Tape & Reel
MC34161P PDIP–8
MC33161D SO–8
MC33161DR2 SO–8 2500 Tape & Reel
MC33161P PDIP–8 50 Units/Rail

50 Units/Rail
98 Units/Rail

 Semiconductor Components Industries, LLC, 2000

April, 2000 – Rev. 2

1 Publication Order Number:

MC34161/D

MC34161, MC33161

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Supply Input Voltage V
Comparator Input Voltage Range V
Comparator Output Sink Current (Pins 5 and 6) (Note 1.) I
Comparator Output Voltage V
Power Dissipation and Thermal Characteristics (Note 1.)

P Suffix, Plastic Package, Case 626

Maximum Power Dissipation @ TA = 70°C
Thermal Resistance, Junction–to–Air

D Suffix, Plastic Package, Case 751

Maximum Power Dissipation @ TA = 70°C

Thermal Resistance, Junction–to–Air
Operating Junction Temperature T
Operating Ambient Temperature (Note 3.)

MC34161
MC33161

Storage Temperature Range T

ELECTRICAL CHARACTERISTICS (V

Characteristics

COMPARATOR INPUTS

Threshold Voltage, Vin Increasing (TA = 25°C)

Threshold Voltage, Vin Increasing (TA = T

Threshold Voltage Variation (VCC = 2.0 V to 40 V) ∆V
Threshold Hysteresis, Vin Decreasing V
Threshold Difference |V
Reference to Threshold Difference (V
Input Bias Current (Vin = 1.0 V)

Input Bias Current (Vin = 1.5 V)

MODE SELECT INPUT

Mode Select Threshold Voltage (Figure 5) Channel 1

Mode Select Threshold Voltage (Figure 5) Channel 2

COMPARATOR OUTPUTS

Output Sink Saturation Voltage (I

Output Sink Saturation Voltage (I
Output Sink Saturation Voltage (I

Off–State Leakage Current (VOH = 40 V) I

REFERENCE OUTPUT

Output Voltage (IO = 0 mA, TA = 25°C) V
Load Regulation (IO = 0 mA to 2.0 mA) Reg
Line Regulation (VCC = 4.0 V to 40 V) Reg
Total Output Variation over Line, Load, and Temperature ∆V
Short Circuit Current I

TOTAL DEVICE

Power Supply Current (V

Power Supply Current (V

Operating Voltage Range (Positive Sensing)

Operating Voltage Range (Negative Sensing)

1. Maximum package power dissipation must be observed.

2. Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.

3. T

=0°C for MC34161 T

low

–40°C for MC33161 +85°C for MC33161

– V

th1

Mode

Mode

| V

th2

ref

= 2.0 mA)

Sink

= 10 mA)

Sink

= 0.25 mA, VCC = 1.0 V)

Sink

, V

, V

in1

, Vin 1, Vin 2 = Gd) (VCC = 40 V)

= 5.0 V, for typical values TA = 25°C, for min/max values TA is the operating ambient

CC

temperature range that applies [Notes 2. and 3.], unless otherwise noted.)

Symbol Min Typ Max Unit

V

RTD

I

IB

V

th(CH 1)

V

th(CH 2)

V

OL

OH

ref

SC

I

CC

V

CC

th

th
H
D

load

line

ref

to T

min

– V

), (V

in1

= Gnd) (VCC = 5.0 V)

in2

high

)

max

– V

ref

in2

= +70°C for MC34161

) V

CC

in

Sink

out

P

D

R

θJA

P

D

R

θJA

J

T

A

stg

1.245

1.235
– 7.0 15 mV

15 25 35 mV

– 1.0 15 mV

1.20 1.27 1.32 V
–

–

V

+0.15

ref

0.3

–
–
–

– 0 1.0 µA

2.48 2.54 2.60 V
– 0.6 15 mV
– 5.0 15 mV

2.45 – 2.60 V
– 8.5 30 mA

–
–

2.0

4.0

40 V

– 1.0 to +40 V

20 mA
40 V

800
100

450
178

+150 °C

0 to +70

– 40 to +85

– 55 to +150 °C

1.27
–

40
85

V

ref

+0.23

0.63

0.05

0.22

0.02

450
560

–
–

V

ref

1.295

1.295

200
400

+0.30

0.9

0.3

0.6

0.2

700
900

40
40

mW

°C/W

mW

°C/W

°C

V

nA

V

V

µA

V

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2

MC34161, MC33161

6.0

VCC = 5.0 V
RL = 10 k to V

5.0

TA =

4.0

3.0

2.0

, OUTPUT VOLTAGE (V)

TA = 85°C

out

TA = 25°C

V

1.0

TA = –40°C

0

1.22 1.281.23 1.24 1.25 1.26 1.27 1.29

CC

25°C

Vin, INPUT VOLTAGE (V)

Figure 1. Comparator Input Threshold Voltage

3600

3000

2400

1800

1200

, OUTPUT PROPAGATION DELAY TIME (ns)

PHL

t

600

VCC = 5.0 V
TA = 25°C

4.0 6.00 2.0

PERCENT OVERDRIVE (%)

1. V

= Gnd, Output Falling

Mode

2. V

= VCC, Output Rising

Mode

3. V

= VCC, Output Falling

Mode

4. V

= Gnd, Output Rising

Mode

1

2

3

4

8.0 10

TA = 85°C
TA = 25°C
TA = –40°C

500

VCC = 5.0 V
V

= Gnd

Mode

TA = 25°C

0

1.0 3.02.00 4.0 5.0
Vin, INPUT VOLTAGE (V)

IB

I , INPUT BIAS CURRENT (nA)

400

300

200

100

Figure 2. Comparator Input Bias Current

versus Input V oltage

8.0
Undervoltage Detector

Programmed to trip at 4.5 V
R1 = 1.8 k, R2 = 4.7 k

6.0

RL = 10 k to V
Refer to Figure 16

4.0

, OUTPUT VOLTAGE (V)

out

2.0

V

0

0 2.0 4.0 6.0 8.0

CC

TA = –40°C
TA = –25°C

TA = –85°C

VCC, SUPPLY VOLTAGE (V)

Figure 3. Output Propagation Delay Time

versus Percent Overdrive

6.0
Channel 2 Threshold Channel 1 Threshold

5.0

VCC = 5.0 V
RL = 10 k to V

TA = 85°C

TA = 25°C
TA = –40°C

1.0 3.00 0.5 1.5 2.52.0 3.5
, MODE SELECT INPUT VOLTAGE (V)

CC

TA = –40°C

, CHANNEL OUTPUT VOLTAGE (V)
V

out

4.0

3.0

2.0

1.0

0

V

Mode

Figure 5. Mode Select Thresholds

TA = 85°C
TA = 25°C

Figure 4. Output V oltage versus Supply Voltage

40

VCC = 5.0 V

35

TA = 25°C

30
25
20
15
10

, MODE SELECT INPUT CURRENT ( A)µ

5.0

Mode

0

I

1.0 3.02.00 4.0 5.0

V

, MODE SELECT INPUT VOLTAGE (V)

Mode

Figure 6. Mode Select Input Current

versus Input V oltage

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3

2.8

2.610

2.4

2.0

1.6

1.2

0.8

ref

V , REFERENCE VOLTAGE (V)

0.4
0

MC34161, MC33161

V

Max = 2.60 V

V

Typ = 2.54 V

ref

ref

VCC = 5.0 V
V

= Gnd

Mode

2.578

2.546

V

= Gnd

Mode

TA = 25°C

0

10 3020 40

VCC, SUPPLY VOLTAGE (V)

2.514

2.482

, REFERENCE OUTPUT VOLTAGE (V)

ref

V

2.450

V

Min = 2.48 V

ref

–55 –25 0 25 50 75 100 125

TA, AMBIENT TEMPERATURE (°C)

0

–2.0

–4.0

VCC = 5.0 V
V

= Gnd

Mode

–6.0

–8.0

, REFERENCE VOLTAGE CHANGE (mV)

ref

V

–10

1.00

Figure 9. Reference V oltage Change

Figure 7. Reference V oltage

versus Supply V oltage

= 85°C

A

T

= –40°C

A

T

2.0 3.0 4.0 5.0 6.0 7.0 8.0

I

, REFERENCE SOURCE CURRENT (mA)

ref

versus Source Current

Figure 8. Reference V oltage

versus Ambient T emperature

0.5
VCC = 5.0 V

V

= Gnd

Mode

0.4

0.3

= 25°C

A

T

, OUTPUT SATURATION VOLTAGE (V)
V

out

0.2

0.1

0

TA = 25°C

4.00

I

, OUTPUT SINK CURRENT (mA)

out

8.0 12 16

TA = 85°C

TA = –40°C

Figure 10. Output Saturation Voltage

versus Output Sink Current

, SUPPLY CURRENT (mA)

CC

I

0.8

0.6

0.4

0.2

0

V

Mode

V

= Gnd

Mode

Pins 2, 3 = 1.5 V

100

VCC, SUPPLY VOLTAGE (V)

Pins 2, 3 = Gnd

20 30 40

Figure 11. Supply Current versus

Supply V oltage

= V

CC

V

= V

Mode

Pin 1 = 1.5 V
Pin 2 = Gnd

ICC measured at Pin 8
TA = 25°C

1.6

1.2

ref

0.8

, INPUT SUPPLY CURRENT (mA)

0.4

CC

I

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4

VCC = 5.0 V
V

= Gnd

Mode

TA = 25°C

0

4.00
I

, OUTPUT SINK CURRENT (mA)

out

8.0 12 16

Figure 12. Supply Current

versus Output Sink Current

MC34161, MC33161

V

CC

8

V

Mode Select

Input 1

Input 2

ref

1

7

+

2

3

–

+

1.27V

+
–

+

1.27V

Reference

+

+

Gnd

2.54V

2.8V

0.6V

–
+

–
+

4

Channel 1

Channel 2

Figure 13. MC34161 Representative Block Diagram

Output 1

6

Output 2

5

Mode Select

Pin 7

GND 0

V

ref

VCC (>2.0 V) 0

Input 1

Pin 2

Output 1

Pin 6

1
0

1

1

0
1

0
1

1
0

Input 2

Pin 3

0
1

0
1

0
1

Output 2

Pin 5

0
1

1
0

1
0

Comments

Channels 1 & 2: Noninverting

Channel 1: Noninverting
Channel 2: Inverting

Channels 1 & 2: Inverting

Figure 14. Truth Table

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5

MC34161, MC33161

FUNCTIONAL DESCRIPTION

Introduction

T o be competitive in today’s electronic equipment market,
new circuits must be designed to increase system reliability
with minimal incremental cost. The circuit designer can take
a significant step toward attaining these goals by
implementing economical circuitry that continuously
monitors critical circuit voltages and provides a fault signal
in the event of an out–of–tolerance condition. The
MC34161, MC33161 series are universal voltage monitors
intended for use in a wide variety of voltage sensing
applications. The main objectives of this series was to
configure a device that can be used in as many voltage
sensing applications as possible while minimizing cost. The
flexibility objective is achieved by the utilization of a unique
Mode Select input that is used in conjunction with
traditional circuit building blocks. The cost objective is
achieved by processing the device on a standard Bipolar
Analog flow , and by limiting the package to eight pins. The
device consists of two comparator channels each with
hysteresis, a mode select input for channel programming, a
pinned out reference, and two open collector outputs. Each
comparator channel can be configured as either inverting or
noninverting by the Mode Select input. This allows a single
device to perform over, under, and window detection of
positive and negative voltages. A detailed description of
each section of the device is given below with the
representative block diagram shown in Figure 13.

Input Comparators

The input comparators of each channel are identical, each
having an upper threshold voltage of 1.27 V ±2.0% with
25 mV of hysteresis. The hysteresis is provided to enhance
output switching by preventing oscillations as the
comparator thresholds are crossed. The comparators have an
input bias current of 60 nA at their threshold which
approximates a 21.2 MΩ resistor to ground. This high
impedance minimizes loading of the external voltage
divider for well defined trip points. For all positive voltage
sensing applications, both comparator channels are fully
functional at a VCC of 2.0 V. In order to provide enhanced
device ruggedness for hostile industrial environments,
additional circuitry was designed into the inputs to prevent
device latch–up as well as to suppress electrostatic
discharges (ESD).

Reference

The 2.54 V reference is pinned out to provide a means for
the input comparators to sense negative voltages, as well as
a means to program the Mode Select input for window
detection applications. The reference is capable of sourcing
in excess of 2.0 mA output current and has built–in short
circuit protection. The output voltage has a guaranteed
tolerance of ±2.4% at room temperature.

The 2.54 V reference is derived by gaining up the internal

1.27 V reference by a factor of two. With a power supply
voltage of 4.0 V, the 2.54 V reference is in full regulation,
allowing the device to accurately sense negative voltages.

Mode Select Circuit

The key feature that allows this device to be flexible is the
Mode Select input. This input allows the user to program
each of the channels for various types of voltage sensing
applications. Figure 14 shows that the Mode Select input has
three defined states. These states determine whether
Channel 1 and/or Channel 2 operate in the inverting or
noninverting mode. The Mode Select thresholds are shown
in Figure 5. The input circuitry forms a tristate switch with
thresholds at 0.63 V and V

+ 0.23 V . The mode select input

ref

current is 10 µA when connected to the reference output, and
42 µA when connected to a VCC of 5.0 V, refer to Figure 6.

Output Stage

The output stage uses a positive feedback base boost
circuit for enhanced sink saturation, while maintaining a
relatively low device standby current. Figure 10 shows that
the sink saturation voltage is about 0.2 V at 8.0 mA over
temperature. By combining the low output saturation
characteristics with low voltage comparator operation, this
device is capable of sensing positive voltages at a VCC of

1.0 V. These characteristics are important in undervoltage
sensing applications where the output must stay in a low
state as VCC approaches ground. Figure 4 shows the Output
Voltage versus Supply Voltage in an undervoltage sensing
application. Note that as VCC drops below the programmed

4.5 V trip point, the output stays in a well defined active low
state until VCC drops below 1.0 V.

APPLICATIONS

The following circuit figures illustrate the flexibility of
this device. Included are voltage sensing applications for
over, under, and window detectors, as well as three unique
configurations. Many of the voltage detection circuits are
shown with the open collector outputs of each channel
connected together driving a light emitting diode (LED).
This ‘ORed’ connection is shown for ease of explanation
and it is only required for window detection applications.

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Note that many of the voltage detection circuits are shown
with a dashed line output connection. This connection gives
the inverse function of the solid line connection. For
example, the solid line output connection of Figure 15 has
the LED ‘ON’ when input voltage VS is above trip voltage
V2, for overvoltage detection. The dashed line output
connection has the LED ‘ON’ when VS is below trip voltage
V2, for undervoltage detection.

6

MC34161, MC33161

V

CC

V

Input V

Output
Voltage
Pins 5, 6

2

S

V

1

Gnd

V

CC

Gnd

V

Hys

LED ‘ON’

1

V

S1

7

R

2

V

S2

R

1

R

2

R

1

+

2

+

–

1.27V

+

3

+

–

1.27V

2.54V

Reference

–
+

+

2.8V

–

+

+

0.6V

6

5

4

8

The above figure shows the MC34161 configured as a dual positive overvoltage detector. As the input voltage increases from ground, the LED will turn ‘ON’ when
VS1 or VS2 exceeds V2. With the dashed line output connection, the circuit becomes a dual positive undervoltage detector. As the input voltage decreases from
the peak towards ground, the LED will turn ‘ON’ when VS1 or VS2 falls below V1.

For known resistor values, the voltage trip points are: For a specific trip voltage, the required resistor ratio is:

R

2

ǒ

V

+

(Vth*

1

VH)

Ǔ

)

1

R

1

V2+

R

2

ǒ

V

th

Ǔ

)

1

R

1

R
R

V

2

1

+

Vth*

1

*

1

V

H

R

V

2

2

+

*

R

1

1

V

th

Figure 15. Dual Positive Overvoltage Detector

V

CC

8

2.54V

Reference

–
+

+

2.8V

–

+

+

0.6V

6

5

Input V

Output
Voltage
Pins 5, 6

V

2

S

V

1

Gnd
V

CC

Gnd

V

Hys

LED ‘ON’

V

V

S2

R

2

R

1

S1

1

7

R

2

R

1

+

2

+

–

1.27V

+

3

+

–

1.27V

4

The above figure shows the MC34161 configured as a dual positive undervoltage detector. As the input voltage decreases towards ground, the LED will turn ‘ON’
when VS1 or VS2 falls below V1. With the dashed line output connection, the circuit becomes a dual positive overvoltage detector. As the input voltage increases
from ground, the LED will turn ‘ON’ when VS1 or VS2 exceeds V2.

For known resistor values, the voltage trip points are: For a specific trip voltage, the required resistor ratio is:

R

2

ǒ

+

(Vth*

V

1

VH)

Ǔ

)

1

R

1

V2+

R

2

ǒ

V

th

Ǔ

)

1

R

1

R
R

V

2

1

+

Vth*

1

*

1

V

H

R

V

2

2

+

*

R

1

1

V

th

Figure 16. Dual Positive Undervoltage Detector

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7

MC34161, MC33161

V

CC

8

2.54V

+
–

1.27V

+
–

1.27V

R
R

1

+

2

Reference

–
+

+

2.8V

–

+

+

0.6V

4

*

V

2

Vth*

Vth)
VH*

6

5

V

H

V

ref

Gnd

R

V

1

Input –V

S

V

2

V1+

R
R

V

CC

Gnd

1

(Vth*

2

V

))V

th

ref

Output
Voltage
Pins 5, 6

The above figure shows the MC34161 configured as a dual negative overvoltage detector. As the input voltage increases from ground, the LED will turn ‘ON’ when
–VS1 or –VS2 exceeds V2. With the dashed line output connection, the circuit becomes a dual negative undervoltage detector. As the input voltage decreases from
the peak towards ground, the LED will turn ‘ON’ when –VS1 or –VS2 falls below V1.

For known resistor values, the voltage trip points are: For a specific trip voltage, the required resistor ratio is:

V2+

R
R

V

Hys

1

(Vth*

2

LED ‘ON’

VH*

V

))Vth*

ref

–V

V

H

S2

R1

–V

S1

R

R1

V

R

1

+

R

Vth*

2

1

2

7

2

+

2

3

+

*

V

1

th

V

ref

Figure 17. Dual Negative Overvoltage Detector

V

CC

8

2.54V

+
–

1.27V

+
–

1.27V

Reference

–
+

+

2.8V

–

+

+

0.6V

4

R

1

+

R

2

V

2

Vth*

*

Vth)

VH*

6

5

V

H

V

ref

1

2

7

2

+

2

3

+

*

V

V

R

1

Vth*

th

V

ref

1

+

R

2

S2

–V

R

R1

S1

R

R1

Gnd

V

1

V

V2+

R
R

Hys

LED ‘ON’

1

(Vth*

2

VH*

V

ref

))Vth*

–V

V

H

Input –V

S

V

2

V1+

R
R

V

CC

Gnd

1

(Vth*

2

V

))V

th

ref

Output
Voltage
Pins 5, 6

The above figure shows the MC34161 configured as a dual negative undervoltage detector. As the input voltage decreases towards ground, the LED will turn ‘ON’
when –VS1 or –VS2 falls below V1. With the dashed line output connection, the circuit becomes a dual negative overvoltage detector. As the input voltage increases
from ground, the LED will turn ‘ON’ when –VS1 or –VS2 exceeds V2.

For known resistor values, the voltage trip points are: For a specific trip voltage, the required resistor ratio is:

Figure 18. Dual Negative Undervoltage Detector

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8

MC34161, MC33161

V

CC

8

VH2)
VH1)

2.54V

Reference

–
+

+

2.8V

–
+

+

0.6V

4

*

1

6

5

*

V

)

th2

th1

VH1)

*

VH2)

V

R

3(V1

3

+

R

V1(V

1

V

4

CH2

V

CH1

3

V

2

V

1

Input V

S

Gnd

Output
Voltage
Pins 5, 6

The above figure shows the MC34161 configured as a positive voltage window detector. This is accomplished by connecting channel 1 as an undervoltage detector ,
and channel 2 as an overvoltage detector. When the input voltage VS falls out of the window established by V1 and V4, the LED will turn ‘ON’. As the input voltage
falls within the window, VS increasing from ground and exceeding V2, or VS decreasing from the peak towards ground and falling below V3, the LED will turn ‘OFF’.
With the dashed line output connection, the LED will turn ‘ON’ when the input voltage VS is within the window.

For known resistor values, the voltage trip points are: For a specific trip voltage, the required resistor ratio is:

V1+

V

CC

Gnd

(V

*

VH1)

th1

ǒ

R1)

V

Hys2

V

Hys1

LED ‘ON’

R

3

)

R

2

1ǓV3+

(V

th2

R2)

ǒ

*

VH2)

R

LED ‘ON’‘OFF’LED ‘OFF’‘ON’

R

3

Ǔ

)

1

1

V

1

S

7

R

3

+

2

–

+

V

3

V1(V

1.27V

+

3

–

+

1.27V

(V

*

th2

*

th1

R

2

R

1

R

2

+

R

1

V2+

V

R

3

ǒ

V

th1

R1)

Ǔ

)

1

R

2

V4+

R2)

R

ǒ

V

th2

3

Ǔ

)

1

R

1

R
R

2

+

1

xV

4

V2xV

th2
th1

*

1

Figure 19. Positive V oltage Window Detector

V

*

V

xV

th2

th1

)

R

4(V2

3

+

R

V

1

2

V

CC

8

2.54V

+
–

1.27V

+
–

1.27V

1

th2

2

th2
th1

th1

*

*

*

*

*

*

V

th2

V

ref

V

th2

VH2*
V

ref

V

th1

VH1*

VH1*

Reference

–
+

+

2.8V

–
+

+

0.6V

4

)

V

H2

V

ref

V

ref

V

th1

6

5

R

3

R

2

R

1
–V

R2)

R2)

R1)

R1)

1

7

2

+

3

+

S

R

R

R

R

V

1

+

R

V

3

V

1

+

R

V

3

V

3

+

R

V3*

2

V

3

+

R

V4)

2

Gnd

V

1

CH2

V

Input –V

S

Output
Voltage
Pins 5, 6

The above figure shows the MC34161 configured as a negative voltage window detector. When the input voltage –VS falls out of the window established by V
and V4, the LED will turn ‘ON’. As the input voltage falls within the window , –VS increasing from ground and exceeding V2, or –VS decreasing from the peak towards
ground and falling below V3, the LED will turn ‘OFF’. With the dashed line output connection, the LED will turn ‘ON’ when the input voltage –VS is within the window.

For known resistor values, the voltage trip points are: For a specific trip voltage, the required resistor ratio is:

V1+

V2+

V3+

V4+

2

V

3

CH1

V

4

V

CC

V

Hys1

Gnd

R

(V

*

V

)

R

*

R

2

R2)(V

R2)(V

ref

3

VH2*

)

R

th1

R

3

th1

R

)

3

*

*

3

)

V

th2

V

)

ref

V

ref

VH1*

)

)

)

V

1

th2

R

2

R

(V

1

th2

(R

)

1

(R

)

1

V

Hys2

LED ‘ON’ LED ‘ON’‘OFF’LED ‘OFF’‘ON’

V

*

V

th2

H2

V

th1

)

ref

)

V

*

V

th1

H1

Figure 20. Negative V oltage Window Detector

1

http://onsemi.com

9

MC34161, MC33161

V

CC

8

V

S2

S1

R
R

R
R

4

V

3

Gnd

V

1

V

2

V

CC

Gnd

3

(V

*

V

))V

th1

4

3

(V

*

th1

4

ref

VH1*

th1

V

))V

th1

ref

V

Hys2

1

7

R

R2

4

+

2

R

3

R

1

R
R

R
R

–

+

1.27V

+

3

–

+

1.27V

(V

*

1

3

+

(V

4

th1

*

(V

2

3

+

(V

4

th1

–V

V

Hys1

LED ‘ON’

R

2

V3+

(V

th2

V4+

*

V

H1

V

th2

ǒ

*

VH2)

)

R

1

R

2

ǒ

Ǔ

)

1

R

1

S1

V

S2

Ǔ

1

Input V

Input –V

Output
Voltage
Pins 5, 6

The above figure shows the MC34161 configured as a positive and negative overvoltage detector. As the input voltage increases from ground, the LED will turn
‘ON’ when either –VS1 exceeds V2, or VS2 exceeds V4. With the dashed line output connection, the circuit becomes a positive and negative undervoltage detector .
As the input voltage decreases from the peak towards ground, the LED will turn ‘ON’ when either VS2 falls below V3, or –VS1 falls below V1.

For known resistor values, the voltage trip points are: For a specific trip voltage, the required resistor ratio is:

V1+

V2+

*

*

V

th1

V

ref

V

th1

VH1*

2.54V

Reference

–
+

+

2.8V

–
+

+

0.6V

4

)

)

)

VH1)

V

ref

6

5

R

V

2

4

+

*

R

1

R

2

+

)

R

1

1

V

th2

V

3

V

th2

*

*

V

H2

1

Figure 21. Positive and Negative Overvoltage Detector

V

CC

8

V

S1

2

V

1

Input V

Gnd

V

S2

(V

V

V

Gnd

th1

V

CC

th1

3

4

R

4

ǒ

*

VH1)

R

4

ǒ

)

1

R

3

Ǔ

)

1

R

3

Ǔ

V3+

V4+

Input –V

Output
Voltage
Pins 5, 6

The above figure shows the MC34161 configured as a positive and negative undervoltage detector. As the input voltage decreases toward ground, the LED will
turn ‘ON’ when either VS1 falls below V1, or –VS2 falls below V3. With the dashed line output connection, the circuit becomes a positive and negative overvoltage
detector. As the input voltage increases from the ground, the LED will turn ‘ON’ when either VS1 exceeds V2, or –VS1 exceeds V1.

For known resistor values, the voltage trip points are: For a specific trip voltage, the required resistor ratio is:

V1+

V2+

R
R

R
R

V

V

1

(Vth*

2

1

(Vth*

2

Hys1

Hys2

LED ‘ON’

V

))V

ref

VH2*

1

7

R

4

V

S1

R

3

R

2

R

1

–V

S2

th2

V

))V

*

V

th2

ref

H2

R
R

R
R

+

2

–

+

1.27V

+

3

–

+

1.27V

V

4

2

+

V

3

th1

V

4

+

V

3

th1

2.54V

Reference

–
+

+

2.8V
6

–
+

+

0.6V
5

4

V

)

VH2*

*

V

*

VH2*

th2

V

ref

V

th2

V

R

4

*

1

1

*

*

V

H1

1

+

R

V

2

th2

*

V

R

3

1

1

+

R

V

2

th2

ref

Figure 22. Positive and Negative Undervoltage Detector

http://onsemi.com

10

MC34161, MC33161

V

CC

Input V

Output
Voltage
Pins 5, 6

8

V

2

V

S

V

1

Hys

R

Gnd

V

Gnd

CC

Osc ‘ON’

R

1

V

S

7

2

2

1

+

1.27V

3

+

2.54V

Reference

–
+

+

+

2.8V

–

–
+

+

+

0.6V

–

R

A

Piezo

6

5

1.27V

4

C

T

The above figure shows the MC34161 configured as an overvoltage detector with an audio alarm. Channel 1 monitors input voltage VS while channel 2 is connected
as a simple RC oscillator. As the input voltage increases from ground, the output of channel 1 allows the oscillator to turn ‘ON’ when VS exceeds V2.

For known resistor values, the voltage trip points are: For a specific trip voltage, the required resistor ratio is:

V1+

(Vth*

VH)

R

2

ǒ

)

1ǓV2+

R

1

R

2

ǒ

V

th

Ǔ

)

1

R

1

R
R

V

2

1

+

Vth*

1

V

R

B

R

V

2

*

1

H

2

+

*

R

1

1

V

th

Figure 23. Overvoltage Detector with Audio Alarm

V

CC

8

2.54V

Input V

V

2

S

V

1

V

Hys

1

7

Gnd

2

V

Output
Voltage
Pin 5

Output
Voltage
Pin 6

The above figure shows the MC34161 configured as a microprocessor reset with a time delay. Channel 2 monitors input voltage VS while channel 1 performs the
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 a specific trip voltage, the required resistor ratio is:

For known R

V1+

V

CC

Gnd

V

CC

Gnd

(Vth*

DLY CDLY

R

2

ǒ

VH)

)

1ǓV2+

R

1

values, the reset time delay is:

R

ǒ

V

th

R

Reset LED ‘ON’

DLY

2

Ǔ

)

1

1

t

DLY

to charge C

t

= R

DLY

when VS exceeds V2.

DLY

DLYCDLY

In

S

R

2

R

1

R

2

+

R

Vth*

1

1

V

th

1 –

V

CC

+

3

+

C

DLY

V

1

*

V

H

Reference

–
+

+

+

–

1.27V

+
–

2.8V
6

–
+

+

0.6V
5

1.27V

4

when VS falls below V1. As the input voltage

DLY

R

V

2

1

2

+

*

R

1

1

V

th

R

3

R

DLY

Figure 24. Microprocessor Reset with Time Delay

http://onsemi.com

11

Input

92 Vac to

276 Vac

MC34161, MC33161

B+

+

MAC

228A6FP

3.0A

MR506

8

2.54V

1

Reference

10k

1.2k

T

220
250V

+

220
250V

75k

75k

RTN

10k

100k

1.6M

10k
3W

+

47

1N

4742

The above circuit shows the MC34161 configured as an automatic line voltage selector. The IC controls the triac, enabling the circuit to function
as a fullwave voltage doubler or a fullwave bridge. Channel 1 senses the negative half cycles of the AC line voltage. If the line voltage is less
than150 V, the circuit will switch from bridge mode to voltage doubling mode after a preset time delay . The delay is controlled by the 100 kΩ resistor
and the 10 µF capacitor. If the line voltage is greater than 150V, the circuit will immediately return to fullwave bridge mode.

7

+

2

–

+

1.27V

+

3

–

+

+

1.27V

10

–
+

+

2.8V

–

+

+

0.6V

4

6

5

Figure 25. Automatic AC Line Voltage Selector

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12

V
12V

MC34161, MC33161

470µH

470

0.01

MPS750

1.8k

1N5819

+

in

330

+

1

8

2.54V
Reference

1000

V

O

5.0V/250mA

–
+

+

2.8V

–
+

+

0.6V

4

6

5

47k

0.005

0.01

4.7k

1.6k

7

+

2

–

+

1.27V

+

3

–

+

1.27V

Figure 26. Step–Down Converter

Test Conditions Results

Line Regulation Vin = 9.5 V to 24 V, IO = 250 mA 40 mV = ±0.1%
Load Regulation Vin = 12 V, IO = 0.25 mA to 250 mA 2.0 mV = ±0.2%
Output Ripple Vin = 12 V, IO = 250 mA 50 mVpp
Efficiency Vin = 12 V, IO = 250 mA 87.8%

The above figure shows the MC34161 configured as a step–down converter. Channel 1 monitors the output voltage while Channel
2 performs the oscillator function. Upon initial power–up, the converters output voltage will be below nominal, and the output of
Channel 1 will allow the oscillator to run. The external switch transistor will eventually pump–up the output capacitor until its voltage
exceeds the input threshold of Channel 1. The output of Channel 1 will then switch low and disable the oscillator. The oscillator will
commence operation when the output voltage falls below the lower threshold of Channel 1.

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13

NOTE 2

–T–

SEATING
PLANE

H

58

–B–

14

F

–A–

C

N

D

G

0.13 (0.005) B

MC34161, MC33161

P ACKAGE DIMENSIONS

PDIP

P SUFFIX

CASE 626–05

ISSUE K

L

J

K

M

A

T

M

M

M

NOTES:

1. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.

2. PACKAGE CONTOUR OPTIONAL (ROUND OR
SQUARE CORNERS).

3. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.

DIM MIN MAX MIN MAX

A 9.40 10.16 0.370 0.400
B 6.10 6.60 0.240 0.260
C 3.94 4.45 0.155 0.175
D 0.38 0.51 0.015 0.020
F 1.02 1.78 0.040 0.070

G 2.54 BSC 0.100 BSC

H 0.76 1.27 0.030 0.050
J 0.20 0.30 0.008 0.012
K 2.92 3.43 0.115 0.135
L 7.62 BSC 0.300 BSC

M ––– 10 ––– 10

N 0.76 1.01 0.030 0.040

INCHESMILLIMETERS

__

A

C

E

B

A1

SO–8

D SUFFIX

CASE 751–06

ISSUE T

D

58

0.25MB

1

H

4

e

M

h

X 45

_

q

C

A

SEATING
PLANE

0.10

L

B

SS

A0.25MCB

NOTES:

1. DIMENSIONING AND TOLERANCING PER ASME
Y14.5M, 1994.

2. DIMENSIONS ARE IN MILLIMETER.

3. DIMENSION D AND E DO NOT INCLUDE MOLD
PROTRUSION.

4. MAXIMUM MOLD PROTRUSION 0.15 PER SIDE.

5. DIMENSION B DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 TOTAL IN EXCESS
OF THE B DIMENSION AT MAXIMUM MATERIAL
CONDITION.

MILLIMETERS

DIM MIN MAX

A 1.35 1.75

A1 0.10 0.25

B 0.35 0.49
C 0.19 0.25
D 4.80 5.00
E

3.80 4.00

1.27 BSCe

H 5.80 6.20
h

0.25 0.50

L 0.40 1.25

0 7

q

__

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14

Notes

MC34161, MC33161

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15

MC34161, MC33161

ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes

without further notice to any products herein. SCILLC makes no warranty , representation or guarantee regarding the suitability of its products for any particular
purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability ,
including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be
validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others.
SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or
death may occur. Should Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold
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alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal Opportunity/Affirmative Action Employer .

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16

MC34161/D