ON Semiconductor MC34161, MC33161, NCV33161 Technical data

MC34161, MC33161,
NCV33161

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.

Features

•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

•NCV Prefix for Automotive and Other Applications Requiring Site

and Control Changes

•Pb-Free Packages are Available

V

CC

8

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MARKING

DIAGRAMS

8

PDIP-8

P SUFFIX

CASE 626

1

SOIC-8

D SUFFIX

1

1

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

(Note: Microdot may be in either location)

CASE 751

Micro8t
DM SUFFIX
CASE 846A

MC3x161P

1

8

ALYW

1

8

x161

AYWG

1

AWL

YYWWG

3x161

G

G

1

V

S

7

2

3

+

-

+

1.27V

+

-

+

1.27V

2.54V

Reference

+

+

Figure 1. Simplified Block Diagram

(Positive Voltage Window Detector Application)

© Semiconductor Components Industries, LLC, 2007

July, 2007 - Rev. 10

-

+

2.8V

-

+

0.6V

4

6

5

This device contains

141 transistors.

1 Publication Order Number:

PIN CONNECTIONS

V

Input 1

Input 2

GND

ref

1

2

3

4

(TOP VIEW)

V

8

Mode Select

7

Output 1

6

Output 2

5

CC

ORDERING INFORMATION

See detailed ordering and shipping information in the package
dimensions section on page 15 of this data sheet.

MC34161/D

MC34161, MC33161, NCV33161

MAXIMUM RATINGS (Note 1)

Rating Symbol Value Unit

Power Supply Input Voltage V

Comparator Input Voltage Range V

Comparator Output Sink Current (Pins 5 and 6) (Note 2) I

Comparator Output Voltage V

CC

in

Sink

out

Power Dissipation and Thermal Characteristics (Note 2)

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

DM Suffix, Plastic Package, Case 846A

Thermal Resistance, Junction-to-Ambient

Operating Junction Temperature T

Operating Ambient Temperature (Note 3)

MC34161

P

D

R

q

JA

P

D

R

q

JA

R

q

JA

J

T

A

MC33161
NCV33161

Storage Temperature Range T

stg

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.

1. This device series contains ESD protection and exceeds the following tests:
Human Body Model 2000 V per MIL-STD-883, Method 3015.

Machine Model Method 200 V.

2. Maximum package power dissipation must be observed.

3. T

=0°C for MC34161 T

low

-40°C for MC33161 +105°C for MC33161

= +70°C for MC34161

high

-40°C for NCV33161 +125°C for NCV33161

40 V

-1.0to+40 V

20 mA

40 V

800
100

450
178

240

mW

°C/W

mW

°C/W

°C/W

+150 °C

°C

0to+70

-40to+105

-40 to +125

-55to+150 °C

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2

MC34161, MC33161, NCV33161

ELECTRICAL CHARACTERISTICS (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 4 and 5], unless otherwise noted.)

Characteristics Symbol Min Typ Max Unit

COMPARATOR INPUTS

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

(TA = T

min

to T

max

)

Threshold Voltage Variation (VCC = 2.0 V to 40 V)

Threshold Hysteresis, Vin Decreasing V

Threshold Difference |V

Reference to Threshold Difference (V

th1

- V

| V

th2

- V

), (V

- V

ref

in1

ref

) V

in2

Input Bias Current (Vin = 1.0 V)

(Vin = 1.5 V)

V

DV

th

H

D

RTD

I

IB

1.245

1.235

th

- 7.0 15 mV

1.27

-

1.295

1.295

15 25 35 mV

- 1.0 15 mV

1.20 1.27 1.32 V

-

-

40
85

MODE SELECT INPUT

Mode Select Threshold Voltage (Figure 6) Channel 1

Channel 2

V

th(CH1)

V

th(CH2)

V

ref

+0.15

0.3

V

ref

0.63

+0.23

V

ref

COMPARATOR OUTPUTS

Output Sink Saturation Voltage (I

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

= 2.0 mA)

Sink

(I

= 10 mA)

Sink

(I

= 0.25 mA, VCC = 1.0 V)

Sink

V

OL

OH

-

-

-

0.05

0.22

0.02

- 0 1.0

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

DV

Short Circuit Current I

ref

load

line

ref

SC

2.48 2.54 2.60 V

- 0.6 15 mV

- 5.0 15 mV

2.45 - 2.60 V

- 8.5 30 mA

TOTAL DEVICE

Power Supply Current (V

Operating Voltage Range (Positive Sensing)

, V

, V

Mode

= GND) ( VCC = 5.0 V)

in1

in2

(Negative Sensing)

(VCC = 40 V)

I

CC

V

CC

-

-

2.0

4.0

450
560

-

-

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

5. T

=0°C for MC34161 T

low

-40°C for MC33161 +105°C for MC33161

= +70°C for MC34161

high

-40°C for NCV33161 +125°C for NCV33161

200
400

+0.30

0.9

0.3

0.6

0.2

700
900

40
40

V

nA

V

V

mA

mA

V

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3

MC34161, MC33161, NCV33161

6.0
VCC = 5.0 V

RL = 10 k to V

5.0

T

A = 25°C

CC

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
Vin, INPUT VOLTAGE (V)

Figure 2. 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

400

V

= GND

Mode

TA = 25°C

300

200

IB

100

I , INPUT BIAS CURRENT (nA)

0

1.0 3.02.00 4.0 5.0
Vin, INPUT VOLTAGE (V)

Figure 3. Comparator Input Bias Current

versus Input Voltage

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 17

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 4. Output Propagation Delay Time

versus Percent Overdrive

6.0

Channel 2 Threshold Channel 1 Threshold

5.0

4.0

VCC = 5.0 V
RL = 10 k to V

CC

3.0

2.0

, CHANNEL OUTPUT VOLTAGE (V)

1.0

out

V

0

TA = 85°C
TA = 25°C
TA = -40°C

TA = -40°C

1.0 3.00 0.5 1.5 2.52.0 3.5

V

, MODE SELECT INPUT VOLTAGE (V)

Mode

Figure 6. Mode Select Thresholds

TA = 85°C
TA = 25°C

Figure 5. Output Voltage 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 7. Mode Select Input Current

versus Input Voltage

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MC34161, MC33161, NCV33161

2.8

2.4

2.0

1.6

1.2

0.8

ref

V , REFERENCE VOLTAGE (V)

0.4

0

0

-2.0

-4.0

-6.0

0

VCC = 5.0 V
V

Mode

10 3020 40

VCC, SUPPLY VOLTAGE (V)

Figure 8. Reference Voltage

versus Supply Voltage

= GND

V

Mode

TA = 25°C

= 85°C

A

T

= GND

= 25°C

A

T

2.610

V

Max = 2.60 V

ref

2.578

2.546

V

Typ = 2.54 V

ref

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)

Figure 9. Reference Voltage

versus Ambient Temperature

0.5
VCC = 5.0 V

V

= GND

Mode

0.4

0.3

0.2

TA = 25°C

TA = 85°C

VCC = 5.0 V
V

= GND

Mode

TA = -40°C

-8.0

, REFERENCE VOLTAGE CHANGE (mV)

ref

V

-10

1.00

Figure 10. Reference Voltage Change

0.8

V

= GND

Mode

0.6
Pins 2, 3 = 1.5 V

0.4

, SUPPLY CURRENT (mA)

0.2

CC

I

0

= -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

V

= V

Mode

CC

Pins 2, 3 =
GND

V

= V

Mode

Pin 1 = 1.5 V
Pin 2 = GND

ICC measured at Pin 8
TA = 25°C

100

20 30 40

VCC, SUPPLY VOLTAGE (V)

Figure 12. Supply Current versus

Supply Voltage

0.1

, OUTPUT SATURATION VOLTAGE (V)

out

V

0

4.00
I

, OUTPUT SINK CURRENT (mA)

out

8.0 12 16

Figure 11. Output Saturation Voltage

versus Output Sink Current

1.6

1.2

ref

0.8

VCC = 5.0 V
V

, INPUT SUPPLY CURRENT (mA)

0.4

CC

I

0

4.00
I

, OUTPUT SINK CURRENT (mA)

out

8.0 12 16

= GND

Mode

TA = 25°C

Figure 13. Supply Current

versus Output Sink Current

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5

MC34161, MC33161, NCV33161

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 14. 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 Comments

0
1

1
0

1
0

Channels 1 & 2: Noninverting

Channel 1: Noninverting
Channel 2: Inverting

Channels 1 & 2: Inverting

Figure 15. Truth Table

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6

MC34161, MC33161, NCV33161

FUNCTIONAL DESCRIPTION

Introduction

To 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 14.

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MW 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 latchup 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 15 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 6. 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 mA when connected to the reference output, and
42 mA when connected to a VCC of 5.0 V, refer to Figure 7.

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 11 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 5 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 16 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.

7

MC34161, MC33161, NCV33161

V

CC

V

Input V

Output
Voltage
Pins 5, 6

2

S

V

1

GND

V

CC

GND

V

Hys

LED `ON'

V

V

S2

R

R

1

S1

7

R

2

+

2

+

R

1

2

1

-

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
V

or VS2 exceeds V2. With the dashed line output connection, the circuit becomes a dual positive undervoltage detector. As the input voltage decreases from

S1

the peak towards ground, the LED will turn `ON' when V

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

R

2

ǒ

+ (Vth* VH)

V

1

Ǔ

) 1

R

1

V2+ V

th

or VS2 falls below V1.

S1

R

2

ǒ

Ǔ

) 1

R

1

R

V

2

1

+

R

Vth* V

1

* 1

H

R

V

2

2

+

R

* 1

V

1

th

Figure 16. 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

R

1

S1

7

R

2

R

1

2

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 V
from ground, the LED will turn `ON' when V

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

or V

S1

V

+ (Vth* VH)

1

falls below V1. With the dashed line output connection, the circuit becomes a dual positive overvoltage detector. As the input voltage increases

S2

R

2

ǒ

Ǔ

) 1

R

1

or VS2 exceeds V2.

S1

R

ǒ

V2+ V

th

R

2

1

) 1

R

V

2

1

Ǔ

+

R

Vth* V

1

* 1

H

R

V

2

2

+

R

* 1

V

1

th

Figure 17. Dual Positive Undervoltage Detector

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8

MC34161, MC33161, NCV33161

V

CC

8

2.54V

+

-

1.27V

+

-

1.27V

R
R

1

2

Reference

­+

+

2.8V

-

+

+

0.6V

4

* Vth) V

V

2

+

Vth* VH* V

6

5

H

ref

GND

R

V

1

Input -V

S

V

2

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

-V
the peak towards ground, the LED will turn `ON' when -V

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

V

CC

GND

or -VS2 exceeds V2. With the dashed line output connection, the circuit becomes a dual negative undervoltage detector. As the input voltage decreases from

S1

R

1

V1+

R

2

(Vth* V

ref

) ) V

th

V2+

V

Hys

LED `ON'

R

1

(Vth* VH* V

R

2

or -VS2 falls below V1.

S1

) ) Vth* V

ref

H

-V

R1

-V

S1

R

R1

S2

V

R

1

1

+

R

Vth* V

2

2

2

* V

1

7

2

+

3

+

th

ref

Figure 18. Dual Negative Overvoltage Detector

V

CC

8

2.54V

+

-

1.27V

+

-

1.27V

Reference

­+

+

2.8V

-

+

+

0.6V

4

R

1

+

R

2

* Vth) V

V

2

Vth* VH* V

6

5

H

ref

GND

V

1

V

V2+

S1

R

1

R

2

Hys

LED `ON'

or -VS2 exceeds V2.

(Vth* VH* V

) ) Vth* V

ref

-V

H

Input -V

S

V

2

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 -V
from ground, the LED will turn `ON' when -V

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

V

CC

GND

or -VS2 falls below V1. With the dashed line output connection, the circuit becomes a dual negative overvoltage detector. As the input voltage increases

S1

R

1

V1+

R

2

(Vth* V

ref

) ) V

th

R

R1

-V

S1

R

R1

S2

1

2

7

2

+

2

3

+

* V

V

R

1

Vth* V

th

ref

1

+

R

2

Figure 19. Dual Negative Undervoltage Detector

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9

MC34161, MC33161, NCV33161

V

CC

8

V

4

CH2

V

CH1

3

V

2

V

1

Input V

S

GND

Output

V

CC

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 V
falls within the window, V
With the dashed line output connection, the LED will turn `ON' when the input voltage V

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

V1+ (V

th1

GND

* VH1)

V

Hys2

V

Hys1

LED `ON'

increasing from ground and exceeding V2, or VS decreasing from the peak towards ground and falling below V3, the LED will turn `OFF'.

S

ǒ

R1) R

R

3

) 1ǓV3+ (V

2

th2

* VH2)

R2) R

ǒ

R

LED `ON'`OFF'LED `OFF'`ON'

falls out of the window established by V1 and V4, the LED will turn `ON'. As the input voltage

S

is within the window.

S

3

Ǔ

) 1

1

V

1

S

7

R

3

+

2

-

+

R

2

R

1

R

2

+

R

1

1.27V

+

3

-

+

1.27V

(V

* VH2)

V

3

th2

(V

* VH1)

V

1

th1

2.54V

Reference

­+

+

2.8V

­+

+

0.6V

4

* 1

6

5

* V

R

V

3

3(V1

+

R

V

1

1

) VH1)

th1

(V

* VH2)

th2

V

V2+ V

th1

ǒ

R1) R

R

3

Ǔ

) 1

2

V4+ V

th2

R2) R

ǒ

3

Ǔ

) 1

R

1

Figure 20. Positive Voltage Window Detector

R
R

2

+

1

 x V

4

V2 x V

th2

th1

* 1

* V

R

V

3

4(V2

+

R

V2 x V

1

V

CC

th1

th2

)

8

2.54V

+

-

1.27V

+

-

1.27V

* V

1

* V

th2

* V

2

* VH2* V

th2

* V

th1

* VH1* V

th1

Reference

+

+

th2

ref

) V

th2

ref

th1

­+

2.8V
6

­+

0.6V
5

4

H2

ref

ref

th1

R

3

R

2

R

1

-V

S

R2) R

R2) R

R1) R

R1) R

1

7

2

+

3

+

1

3

1

3

3

2

3

2

V

+

V

V

+

V

V

+

V3* V

V

+

V4) VH1* V

R

R

R

R

GND

V

1

CH2

V

R

R

(R

(R

CH1

(V

1

R2) R

(V

1

) R2)(V

1

) R2)(V

1

2

V

3

V

4

V

CC

GND

* V

th2

* VH2* V

th2

R2) R

V

Hys1

, 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.

3

)

ref

) V

th2

3

)

ref

) V

3

* V

)

th1

ref

R

3

th1

R

) V

* VH1* V

3

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 V

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

V1+

V2+

V3+

V4+

V

Hys2

LED `ON' LED `ON'`OFF'LED `OFF'`ON'

* V

th2

H2

th1

)

ref

) V

* V

th1

H1

Figure 21. Negative Voltage Window Detector

1

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10

MC34161, MC33161, NCV33161

V

CC

8

V

Input V

4

S2

V

3

GND

V

S1

R
R

R
R

3

4

3

4

GND

(V

(V

1

V

2

V

CC

exceeds V2, or VS2 exceeds V4. With the dashed line output connection, the circuit becomes a positive and negative undervoltage detector.

S1

* V

th1

th1

) ) V

ref

* VH1* V

th1

ref

) ) V

th1

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 -V
As the input voltage decreases from the peak towards ground, the LED will turn `ON' when either V

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

V1+

V2+

* V

H1

V

Hys2

V

Hys1

LED `ON'

V3+ (V

V4+ V

th2

th2

* VH2)

R

2

ǒ

R

1

) 1

1

7

R

-V

S1

4

R

3

+

2

+

1.27V

R2

V

S2

R

1

falls below V3, or -VS1 falls below V1.

S2

R

2

ǒ

Ǔ

) 1

R

1

Ǔ

R
R

R
R

+

3

-

+

1.27V

(V

3

1

+

(V

4

th1

(V

3

2

+

(V

4

th1

Reference

-

* V

)

th1

* V

)

ref

* V

) VH1)

th1

* VH1* V

2.54V

+

+

4

­+

2.8V

­+

0.6V

ref

6

5

R

V

2

4

+

R

R

)

R

* 1

V

1

th2

V

2

1

3

+

V

th2

* V

* 1

H2

Figure 22. Positive and Negative Overvoltage Detector

V

CC

8

V

Input V

2

S1

V

1

GND

V

S2

V

GND

th1

V

CC

th1

3

4

* VH1)

R

ǒ

R

falls below V1, or -VS2 falls below V3. With the dashed line output connection, the circuit becomes a positive and negative overvoltage

S1

R

4

ǒ

Ǔ

) 1

R

3

4

Ǔ

) 1

3

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 V
detector. As the input voltage increases from the ground, the LED will turn `ON' when either V

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

V1+ (V

V2+ V

V

Hys1

V

Hys2

LED `ON'

R

1

(Vth* V

R

2

R

1

(Vth* VH2* V

R

2

ref

) ) V

th2

ref

) ) V

th2

* V

1

7

R

4

V

S1

R

2

R

1

-V

S2

exceeds V2, or -VS1 exceeds V1.

S1

H2

2

R

+

3

1.27V

3

+

1.27V

R

V

4

2

+

R

V

3

th1

R

4

+

R

V

3

th1

+

-

+

-

* 1

V

* V

1

Reference

+

+

* 1

H1

2.54V

4

­+

2.8V

­+

0.6V

6

5

) VH2* V

V

R

4

1

+

R

V

* VH2* V

2

th2

* V

V

R

3

1

+

R

V

* V

2

th2

th2

th2

ref

ref

Figure 23. Positive and Negative Undervoltage Detector

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11

MC34161, MC33161, NCV33161

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

* 1

R

B

exceeds V2.

S

R

V

2

2

+

R

* 1

V

1

th

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 V

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+ V

R

1

R

2

ǒ

Ǔ

) 1

th

R

1

R

V

2

1

+

R

Vth* V

1

H

Figure 24. Overvoltage Detector with Audio Alarm

V

CC

8

2.54V

Input V

V

2

S

V

1

V

Hys

1

7

GND

2

V

R
R

1 -

R

R

2

1

S

2

1

+

Vth* V

1

V

V

CC

th

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:

V1+ (Vth* VH)

For known R

V

CC

GND

V

CC

GND

DLY CDLY

Reset LED `ON'

R

2

ǒ

) 1ǓV2+ V

R

1

values, the reset time delay is:

R

2

ǒ

) 1

th

R

1

Ǔ

to charge C

DLY

t

t

DLY

DLY

when VS exceeds V2.

DLY

= R

DLYCDLY

In

+

3

+

C

DLY

V

1

* 1

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

2

+

R

* 1

V

1

th

R

3

R

DLY

Figure 25. Microprocessor Reset with Time Delay

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12

Input

92 Vac to

276 Vac

MC34161, MC33161, NCV33161

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 kW resistor
and the 10 mF capacitor. If the line voltage is greater than 150V, 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 26. Automatic AC Line Voltage Selector

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13

V
12V

MC34161, MC33161, NCV33161

470mH

470

MPS750

1N5819

+

in

330

+

8

2.54V

1

Reference

0.01

1.8k

1000

V

O

5.0V/250mA

-

0.01

4.7k

1.6k

7

+

2

-

+

1.27V

+

3

-

+

1.27V

+

+

2.8V
6

­+

+

0.6V
5

47k

4

0.005

Figure 27. 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 powerup, 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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14

MC34161, MC33161, NCV33161

ORDERING INFORMATION

Device Package Shipping

MC34161D SOIC-8

MC34161DG SOIC-8

MC34161DR2 SOIC-8

MC34161DR2G SOIC-8

MC34161DMR2 Micro8

MC34161DMR2G Micro8

MC34161P PDIP-8

MC34161PG PDIP-8

MC33161D SOIC-8

MC33161DG SOIC-8

MC33161DR2 SOIC-8

MC33161DR2G SOIC-8

MC33161DMR2 Micro8

MC33161DMR2G Micro8

MC33161P PDIP-8

MC33161PG PDIP-8

NCV33161DR2* SOIC-8

NCV33161DR2G* SOIC-8

†For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging

Specifications Brochure, BRD8011/D.

*NCV: T

= -40°C, T

low

= +125°C. Guaranteed by design. NCV prefix is for automotive and other applications requiring site and control changes.

high

(Pb-Free)

(Pb-Free)

(Pb-Free)

(Pb-Free)

(Pb-Free)

(Pb-Free)

(Pb-Free)

(Pb-Free)

(Pb-Free)

98 Units/Rail

2500/Tape & Reel

4000/Tape & Reel

50 Units/Rail

98 Units/Rail

2500/Tape & Reel

4000/Tape & Reel

50 Units/Rail

2500/Tape & Reel

†

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15

NOTE 2

-T-

SEATING
PLANE

H

58

-B-

14

F

-A-

C

N

D

G

0.13 (0.005) B

MC34161, MC33161, NCV33161

PACKAGE DIMENSIONS

PDIP-8

CASE 626-05

ISSUE L

L

J

K

M

M

A

T

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

__

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16

-Y-

-Z-

MC34161, MC33161, NCV33161

PACKAGE DIMENSIONS

SOIC-8 NB

CASE 751-07

ISSUE AH

NOTES:

-X­A

58

B

1

S

0.25 (0.010)

4

M

M

Y

K

G

C

SEATING
PLANE

0.10 (0.004)

H

D

0.25 (0.010) Z

M

Y

SXS

N

X 45

_

M

J

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

2. CONTROLLING DIMENSION: MILLIMETER.

3. DIMENSION A AND B DO NOT INCLUDE
MOLD PROTRUSION.

4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.

5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.

6. 751-01 THRU 751-06 ARE OBSOLETE. NEW
STANDARD IS 751-07.

MILLIMETERS

DIMAMIN MAX MIN MAX

4.80 5.00 0.189 0.197

B 3.80 4.00 0.150 0.157
C 1.35 1.75 0.053 0.069
D 0.33 0.51 0.013 0.020

G 1.27 BSC 0.050 BSC

H 0.10 0.25 0.004 0.010
J 0.19 0.25 0.007 0.010
K 0.40 1.27 0.016 0.050

M 0 8 0 8

____

N 0.25 0.50 0.010 0.020
S 5.80 6.20 0.228 0.244

INCHES

SOLDERING FOOTPRINT*

1.52

0.060

7.0

0.275

0.6

0.024

*For additional information on our Pb-Free strategy and soldering

details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.

4.0

0.155

1.270

0.050

SCALE 6:1

ǒ

inches

mm

Ǔ

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17

MC34161, MC33161, NCV33161

l

PACKAGE DIMENSIONS

Micro8t

CASE 846A-02

ISSUE G

SEATING
PLANE

-T-

0.038 (0.0015)

PIN 1 ID

DD

H

E

e

E

b

8 PL

0.08 (0.003) A

M

T

S

B

S

NOTES:

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

2. CONTROLLING DIMENSION: MILLIMETER.

3. DIMENSION A DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE
BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED

0.15 (0.006) PER SIDE.

4. DIMENSION B DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSION.
INTERLEAD FLASH OR PROTRUSION SHALL NOT EXCEED 0.25 (0.010) PER SIDE.

5. 846A-01 OBSOLETE, NEW STANDARD 846A-02.

DIMAMIN NOM MAX MIN

A1 0.05 0.08 0.15 0.002

b 0.25 0.33 0.40 0.010
c 0.13 0.18 0.23 0.005
D 2.90 3.00 3.10 0.114
E 2.90 3.00 3.10 0.114
e 0.65 BSC
L 0.40 0.55 0.70 0.016

H

E

MILLIMETERS

-- -- 1.10 --

4.75 4.90 5.05 0.187 0.193 0.199

INCHES

NOM MAX

-- 0.043

0.003 0.006

0.013 0.016

0.007 0.009

0.118 0.122

0.118 0.122

0.026 BSC

0.021 0.028

A

A1

c

L

SOLDERING FOOTPRINT*

8X

1.04

0.041

0.38

0.015

8X

6X

3.20

0.126

0.65

0.0256

0.167

4.24

SCALE 8:1

5.28

0.208

ǒ

inches

mm

Ǔ

*For additional information on our Pb-Free strategy and soldering

details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.

Micro8 is a trademark of International Rectifier.

ON Semiconductor and are registered 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 SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.

PUBLICATION ORDERING INFORMATION

LITERATURE FULFILLMENT:

Literature Distribution Center for ON Semiconductor
 P.O. Box 5163, Denver, Colorado 80217 USA
 Phone : [phone] or 800-344-3860 Toll Free USA/Canada
 Fax : [phone] or 800-344-3867 Toll Free USA/Canada
 Email: [e-mail]

N. American Technical Support: 800-282-9855 Toll Free
 USA/Canada

Europe, Middle East and Africa Technical Support:

 Phone: [phone]

Japan Customer Focus Center

 Phone: [phone]

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ON Semiconductor Website: www.onsemi.com

Order Literature: http://www.onsemi.com/orderlit

For additional information, please contact your loca
Sales Representative

MC34161/D

18