ON Semiconductor MC34064, MC33064, NCV33064 Technical data

MC34064, MC33064, NCV33064

Undervoltage Sensing Circuit

The MC34064 is an undervoltage sensing circuit specifically designed for use as a reset controller in microprocessor−based systems. It offers the designer an economical solution for low voltage detection with a single external resistor. The MC34064 features a trimmed−in−package bandgap reference, and a comparator with precise thresholds and built-in hysteresis to prevent erratic reset operation. The open collector reset output is capable of sinking in excess of 10 mA, and operation is guaranteed down to 1.0 V input with low standby current. The MC devices are packaged in 3−pin TO-92, micro size TSOP−5, 8−pin SOIC−8 and Micro8 surface mount packages. The NCV device is packaged in SOIC−8 and TO−92.

Applications include direct monitoring of the 5.0 V MPU/logic power supply used in appliance, automotive, consumer and industrial equipment.

Features

• Trimmed−In−Package Temperature Compensated Reference

• Comparator Threshold of 4.6 V at 25°C

• Precise Comparator Thresholds Guaranteed Over Temperature

• Comparator Hysteresis Prevents Erratic Reset

• Reset Output Capable of Sinking in Excess of 10 mA

• Internal Clamp Diode for Discharging Delay Capacitor

• Guaranteed Reset Operation with 1.0 V Input

• Low Standby Current

• Economical TO−92, TSOP−5, SOIC−8 and Micro8 Surface Mount

Packages

• NCV Prefix for Automotive and Other Applications Requiring Site

and Control Changes

• Pb−Free Packages are Available

Input

2 (2)

Reset

1 (1)

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Pin 1. Reset

PIN CONNECTIONS

Reset

Input

N.C.

Ground

(Top View)

TO−92

P SUFFIX

CASE 29

2. Input

3. Ground

SOIC−8

D SUFFIX

CASE 751

Micro8 DM SUFFIX CASE 846A

TSOP−5

SN SUFFIX

CASE 483

2. Input

3. Ground

4. NC

5. NC

N.C.

1.2 V

ref

3 (4)

GND

Pin numbers adjacent to terminals are for the 3−pin TO−92 package. Pin numbers in parenthesis are for the 8−lead packages.

This device contains 21 active transistors.

Figure 1. Representative Block Diagram

 Semiconductor Components Industries, LLC, 2005

February, 2005 − Rev. 12

ORDERING INFORMATION

See detailed ordering and shipping information in the package dimensions section on page 6 of this data sheet.

DEVICE MARKING INFORMATION

Sink Only Positive True Logic

1 Publication Order Number:

See general marking information in the device marking section on page 7 of this data sheet.

MC34064/D

MC34064, MC33064, NCV33064

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Input Supply Voltage V Reset Output Voltage V Reset Output Sink Current (Note 2) I

Clamp Diode Forward Current, Pin 1 to 2 (Note 2) I

in O

Sink

Power Dissipation and Thermal Characteristics

P Suffix, Plastic Package

Maximum Power Dissipation @ T

= 25°C

Thermal Resistance, Junction−to−Air

D Suffix, Plastic Package

Maximum Power Dissipation @ T

= 25°C

Thermal Resistance, Junction−to−Air

DM Suffix, Plastic Package

Maximum Power Dissipation @ T

= 25°C

Thermal Resistance, Junction−to−Air Operating Junction Temperature T Operating Ambient Temperature



MC34064 MC33064 NCV33064

Storage Temperature Range T

stg

Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously . If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected.

1. ESD data available upon request.

−1.0 to 10 V 10 V

Internally

Limited

100 mA

625 200

520 240

°C/W

+150 °C

°C

0 to +70

−40 to +85

−40 to +125

−65 to +150 °C

ELECTRICAL CHARACTERISTICS (For typical values T

= 25°C, for min/max values TA is the operating ambient temperature range

that applies [Notes 3 and 4] unless otherwise noted.)

Characteristics Symbol Min Typ Max Unit

COMPARATOR

Threshold Voltage

High State Output (Vin Increasing) Low State Output (V Hysteresis

Decreasing)

4.5

0.01

4.61

4.59

0.02

RESET OUTPUT

Output Sink Saturation

(Vin = 4.0 V, I (V

= 4.0 V, I

= 1.0 V, I

= 8.0 mA)

Sink

= 2.0 mA)

Sink

= 0.1 mA)

Sink

Output Sink Current (Vin, Reset = 4.0 V) I Output Off-State Leakage (Vin, Reset = 5.0 V) I Clamp Diode Forward Voltage, Pin 1 to 2 (IF = 10 mA) V

Sink

−

0.46

0.15

−

10 27 60 mA

− 0.02 0.5 A

0.6 0.9 1.2 V

TOTAL DEVICE

Operating Input Voltage Range V Quiescent Input Current (Vin = 5.0 V) I

1.0 to 6.5 − − V

− 390 500 A

2. Maximum package power dissipation limits must be observed.

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

4. T

=0°C for MC34064 T

low

−40°C for MC33064 +85°C for MC33064

= +70°C for MC34064

high

−40°C for NCV33064 +125°C for NCV33064

5. NCV prefix is for automotive and other applications requiring site and change control.

4.7

0.05

1.0

0.4

0.1

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MC34064, MC33064, NCV33064

8.0

RL = 10 k to V T

= 25°C

6.0

4.0

, OUTPUT VOLTAGE (V)

2.0

0 2.0 4.0 6.0 8.0 10

Vin, INPUT VOLTAGE (V)

Figure 2. Reset Output Voltage versus

Input Voltage

4.630

4.620

4.610

4.600

4.590

, THRESHOLD VOLTAGE (V)

4.580

RL = 10 k to V

Upper Threshold

High State Output

Lower Threshold

Low State Output

5.0

4.0

RL = 10 k to V T

= 25°C

3.0

2.0

, OUTPUT VOLTAGE (V)

1.0

4.560 4.580 4.600 4.620 4.640 V

, INPUT VOLTAGE (V)

Figure 3. Reset Output Voltage versus

Input Voltage

1.0

= +25°C

0.8

0.6

0.4

, INPUT CURRENT (mA)

0.2

= +25°C

+85°C

−40°C

+85°C

−40°C

4.570

−55 −25 0 25 50 75 100 125

, AMBIENT TEMPERATURE (°C)

Figure 4. Comparator Threshold Voltage

versus Temperature

2.0

1.5

Vin = 4.0 V

= 85°C

= 25°C

= −40°C

1.0

, OUTPUT SATURATION (V)

0.5

010203040

, SINK CURRENT (mA)

Sink

Figure 6. Reset

Output Saturation versus

Sink Current

0 2.0 4.0 6.0 8.0 10

, INPUT VOLTAGE (V)

Figure 5. Input Current versus Input Voltage

90%

5.0 V −

4.0 V −

10%

5.0V

4.0V

Reset

REF

10k

Reset

200 ns/DIV

Vin = 5.0 V to 4.0 V RL = 10 k T

Figure 7. Reset Delay Time

= 25°C

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MC34064, MC33064, NCV33064

Vin = 0 V T

= 25°C

, FORWARD CURRENT (mA)

0 0.4 0.8 1.2 1.6

, FORWARD VOLTAGE (V)

F

Figure 8. Clamp Diode Forward Current versus Voltage

Power

Supply

−

Power

Supply

−

2 (2)

1.2 V

1 (1)

−

ref

3 (4)

Reset

Microprocessor

Circuit

DLY

A time delayed reset can be accomplished with the addition of C power supply rise times (<500 ns) it is recommended that the RC V

th(MPU)

. For systems with extremely fast

DLY

time constant be greater than 5.0 s.

DLY

is the microprocessor reset input threshold.

DLY

= RC

DLY

1 −

th(MPU)

Figure 9. Low Voltage Microprocessor Reset

TEST DATA

(mV)

V

(mV)

1.2V

ref

3 (4)

1 (1)

Reset

Microprocessor

Circuit

−

4.6 R

≈

V

th(lower)

Where:R

+ 0.02

≈ 340 R

x 10

≤ 150 

≥ 1.5 , ≤ 10 k

−6

51 40 81 71

112 100 164 190 327 276 480

3.4

6.8

6.8 10 10 16 16 34 34 51 51

R ()

0 10 20 20 30 30 47 47

100 100 150 150

(k)

1.5

4.7

1.5

2.7

1.5

2.7

1.5

2.7

1.5

2.7

1.5

Comparator hysteresis can be increased with the addition of resistor R simplified and does not account for the change of input current Iin as VCC crosses the comparator threshold (Figure 4). An increase of the lower threshold V

4.59V. The equations are accurate to ±10% with R

will be observed due to Iin which is typically 340 A at

th(lower)

less than 150  and RL between 1.5 k and 10 k

. The hysteresis equation has been

Figure 10. Low Voltage Microprocessor Reset with Additional Hysteresis

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