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MC33064/MC34064
U N D E RV O LTA G E S E N S I N G C I R C U I T
T
HE
I
NFINITE
P
OWER
OF
I
N N O VAT I O N
P
RODUCTION
D
ATA
S
HEET
DESCRIPTION The MC34064 is an undervoltage sensing circuit designed specifically for use as a reset controller in microprocessor-based systems. It offers the designer an economical, space-efficient solution for low supply voltage detection when used in combination with a single pullup resistor. Adding one capacitor offers the functionality of a programmable delay time after power returns. The 34064 consists of a temperature stable reference comparator with hysteresis, high-current clamping diode and open collector output stage capable of sinking up to 60mA. The MC34064's RESET output is specified to be fully functional at VIN=1V. A major improvement over competing products is the glitch-free supply current during undervoltage detection. Competing products demand a step function increase in operating current during the time that you least want or need it.... during power loss. See Product Highlight below.
K E Y F E AT U R E S
s Monitors 5V Supplies (VT = 4.6V Typ.) s Outputs Fully Defined At VIN = 1V (See Figure 1) s Glitch-Free Supply Current During Switching (See Product Highlight) ! Ultra-Low Supply Current (500A Max.) ! Temperature Compensated ICC For Extremely Stable Current Consumption ! P Reset Function Programmable With 1 External Resistor And Capacitor ! Comparator Hysteresis Prevents Output Oscillation ! Electrically Compatible With Motorola MC34064 ! Pin-to-Pin Compatible With Motorola MC34064/MC34164.
NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.
PRODUCT HIGHLIGHT
SUPPLY C U R R E N T
400 385 370 355 340 325 310 295 280 265 250 -10
VS.
I N P U T VOLTAGE
APPLICATIONS
s All Microprocessor Or Microcontroller Designs Using 5V Supplies
RL = No Load SWITCHING REGION
s Simple 5V Undervoltage Detection
(ICC) Supply Current - ( A)
ACTIVE REGION
MONITOR REGION
-8
-6
-4
-2
0
2
4
6
8
10
Input Voltage less Threshold Voltage - (mV)
PA C K A G E O R D E R I N F O R M A T I O N TA (C) 0 to 70 -40 to 85 -55 to 125
DM Plastic SOIC 8-pin
MC34064DM MC33064DM --
LP Plastic TO-92 3-pin
MC34064LP MC33064LP --
Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. MC34064DMT)
Copyright (c) 1999 Rev. 1.3 6/99
LINFINITY MICROELECTRONICS INC.
11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570
1
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P
RODUCTION
D
ATA
S
HEET
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PACKAGE PIN OUTS
RESET VIN N.C. GROUND
1 2 3 4 8 7 6 5
Input Supply Voltage (VIN) ............................................................................... -1V to 10V RESET Output Voltage (VOUT) ..................................................................................... 10V Output Sink Current (IOL) ............................................................ Internally Limited (mA) Clamp Diode Forward Current (IF), Pin 1 to pin 2 ............................................... 100mA Operating Junction Temperature Plastic (DM, LP - Packages) .................................................................................. 150C Storage Temperature Range ...................................................................... -65C to 150C Lead Temperature (Soldering, 10 seconds) ............................................................. 300C
Note 1. Values beyond which damage may occur. All voltages are specified with respect to ground, and all currents are positive into the specified terminal.
N.C. N.C. N.C. N.C.
DM PACKAGE (Top View)
3. GROUND 2. VIN 1. RESET
THERMAL DATA
DM PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA LP PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, JA 156C/W 165C/W LP PACKAGE (Top View)
Junction Temperature Calculation: TJ = TA + (PD x JA). The JA numbers are guidelines for the thermal performance of the device/pc-board system. All of the above assume no ambient airflow
BLOCK D IA GR A M
VIN
RESET
1.2 VREF
GROUND
2
Copyright (c) 1999 Rev. 1.3 6/99
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
U N D E RV O LTA G E S E N S I N G C I R C U I T
P
RODUCTION
D
ATA
S
HEET
R E C O M M E N D E D O P E R AT I N G C O N D I T I O N S Parameter
Input Supply Voltage RESET Output Voltage Clamp Diode Forward Current Operating Ambient Temperature Range: MC34064 MC33064 Note 2. Range over which the device is functional.
(Note 2)
Symbol
VIN VOUT IF TA TA
Recommended Operating Conditions Min. Typ. Max.
1 6.5 50mA 0 -40 70 85 6.5
Units
V V
C C
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, these specifications apply over the operating ambient temperatures of 0C TA 70C for the MC34064 and -40C TA 85C for the MC33064. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.)
Parameter Comparator Section
Threshold Voltage High State Output Low State Output Hysteresis
Symbol
Test Conditions
MC34064/MC33064 Min. Typ. Max.
Units
VT+ VTVH
VIN Increasing -- 4V to 5V VIN Decreasing -- 5V to 4V
4.5 4.5 0.01
4.61 4.59 0.02
4.7 4.7 0.05 1.0 0.4 0.1 60 0.5 1.2 500
V V V V V V mA A V A
RESET Output Section
Output Low Level Saturation Voltage VOL Output Low Level Current Output Off-State Leakage Clamp Diode Forward Voltage IOL IOH VF ICC VIN = 4.0V, IOL = 8.0mA VIN = 4.0V, IOL = 2.0mA VIN = 1.0V, IOL = 0.1mA VIN = VOUT = 4.0V VIN = VOUT = 5.0V Pin 1 to pin 2, IF = 10mA VIN = 5.0V
10 0.6
27 0.02 0.9 390
Total Device
Supply Current
Copyright (c) 1999 Rev. 1.3 6/99
3
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P
RODUCTION
D
ATA
S
HEET
GRAPH / CURVE INDEX
FIGURE INDEX
Characteristic Curves
FIGURE # 1. 2. 3. 4. 5. 6. 7. 8. 9. INPUT VOLTAGE and RESET OUTPUT VOLTAGE vs. TIME POWER-UP RESET VOLTAGE POWER-DOWN RESET VOLTAGE RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE THRESHOLD VOLTAGE vs. TEMPERATURE THRESHOLD HYSTERESIS vs. TEMPERATURE SUPPLY CURRENT vs. INPUT VOLTAGE SUPPLY CURRENT vs. TEMPERATURE LOW LEVEL OUTPUT CURRENT vs TEMPERATURE FIGURE #
Application Circuits
15. LOW VOLTAGE MICROPROCESSOR RESET 16. SWITCHING THE LOAD OFF WHEN BATTERY REACHES BELOW 4.3V 17. VOLTAGE MONITOR 18. MOSFET LOW VOLTAGE GATE DRIVE PROTECTION 19. LOW VOLTAGE MICROPROCESSOR RESET with ADDITIONAL HYSTERESIS 20. SOLAR POWERED BATTERY CHARGER
10. LOW LEVEL OUTPUT SATURATION VOLTAGE vs. TEMPERATURE 11. LOW LEVEL OUTPUT SATURATION VOLTAGE vs. TEMPERATURE 12. CLAMP DIODE FORWARD VOLTAGE vs. FORWARD CURRENT 13. PROPAGATION DELAY -- HIGH to LOW 14. PROPAGATION DELAY -- LOW to HIGH
4
Copyright (c) 1999 Rev. 1.3 6/99
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
U N D E RV O LTA G E S E N S I N G C I R C U I T
P
RODUCTION
D
ATA
S
HEET
CHARACTERISTIC
CURVES
FIGURE 1. -- INPUT VOLTAGE and RESET OUTPUT VOLTAGE vs. TIME
20
FIGURE 2. -- POWER-UP RESET VOLTAGE
2.0
RESET - (V)
15 10 5 0
RL = 10k
Power-Up RESET Voltage - (V)
TA = 25 C
1.8 1.6 1.4 1.2 1.0
RL = 10kohms TA = 25 C
VIN
0.8 0.6
20
VIN - (V)
15 10 5 0 0 .2 .4 .6 .8 1.0 1.2 1.4 1.6 1.8 2.0
RESET
0.4 0.2 0 0 0.4 0.8 1.2 1.6 2.0
(t) Time - (ms)
(t) Time - (ms)
FIGURE 3. -- POWER-DOWN RESET VOLTAGE
2.0 1.8
FIGURE 4. -- RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE
5
(VOUT) RESET Output Voltage - (V)
Power-Down RESET Voltage - (V)
RL = 10kohms TA = 25 C
RL = 10kohms TA = 25 C
4
1.6 1.4 1.2 1.0
3
VIN
0.8 0.6 0.4
2
1
RESET
0.2 0 0 0.4 0.8 1.2 1.6 2.0
0 4.58 4.59 4.60 4.61 4.62
(t) Time - (ms)
(VIN) Input Voltage - (V)
Copyright (c) 1999 Rev. 1.3 6/99
5
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P
RODUCTION
D
ATA
S
HEET
CHARACTERISTIC
CURVES
FIGURE 5. -- THRESHOLD VOLTAGE vs. TEMPERATURE
4.7 4.68 4.66
FIGURE 6. -- THRESHOLD HYSTERESIS vs. TEMPERATURE
50
(VH) Threshold Hysteresis - (mV)
125 150
VT+ ; VIN increasing 4.5 - 4.7 VT- ; VIN decreasing 4.7 - 4.5 RL = 10kohms
46 42 38 34 30 26 22 18 14 10 -55
(VT) Threshold Voltage - (V)
4.64 4.62 4.6 4.58 4.56 4.54 4.52 4.5 -55 VT- - Low Threshold Voltage VT+ - High Threshold Voltage
-25
0
25
50
75
100
-25
0
25
50
75
100
125
150
(TJ) Temperature - ( C)
(TJ) Temperature - ( C)
FIGURE 7. -- SUPPLY CURRENT vs. INPUT VOLTAGE
1000
FIGURE 8. -- SUPPLY CURRENT vs. TEMPERATURE
1000
RL = No Load TA = 25 C
900
RL = No Load
(ICC) Supply Current - ( A)
(ICC) Supply Current - ( A)
800
800 VIN = 10V 700 600 500 400 300 200 100 VIN = 5V
600
400
200
0 0 2 4 6 8 10
0 -55
-25
0
25
50
75
100
125
150
(VIN) Input Voltage - (V)
(TJ) Temperature - ( C)
6
Copyright (c) 1999 Rev. 1.3 6/99
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
U N D E RV O LTA G E S E N S I N G C I R C U I T
P
RODUCTION
D
ATA
S
HEET
CHARACTERISTIC
CURVES
FIGURE 9. -- LOW LEVEL OUTPUT CURRENT vs. TEMPERATURE
50
FIGURE 10. -- LOW LEVEL OUTPUT SATURATION VOLTAGE vs. TEMPERATURE
(VOL) Low Level Output Saturation Voltage - (mV)
400 360 320 280 240 200 160 120 80 40 0 -55 IOL = 2mA IOL = 8mA
(IOL) Low Level Output Current - (mA)
45 40 35 30 25 20 15 10 5 0 -55 VIN = VOUT = 1V VIN = VOUT = 4V
VIN = 4V
-25
0
25
50
75
100
125
150
-25
0
25
50
75
100
125
150
(TJ) Temperature - ( C)
(TJ) Temperature - ( C)
FIGURE 11. -- LOW LEVEL OUTPUT SATURATION VOLTAGE vs. TEMPERATURE
FIGURE 12. -- CLAMP DIODE FORWARD VOLTAGE vs. FORWARD CURRENT
1.2
(VOL) Low Level Output Saturation Voltage - (mV)
100 90 80 70 60 50 40 30 20 10 0 -55
(VF) Clamp Diode Forward Voltage - (V)
VIN = 1V IOL = 100 A
RESET = 0V
1.1 1 -40 C
0.9 25 C 0.8 85 C 0.7 0.6
0.5 -25 0 25 50 75 100 125 150 0 10 20 30 40 50 60 70 80 90 100
(TJ) Temperature - ( C)
(IF) Forward Current - (mA)
Copyright (c) 1999 Rev. 1.3 6/99
7
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P
RODUCTION
D
ATA
S
HEET
CHARACTERISTIC
CURVES
FIGURE 13. -- PROPAGATION DELAY -- HIGH to LOW
5.5
FIGURE 14. -- PROPAGATION DELAY -- LOW to HIGH
5.5
TA = 25 C
VIN 5V 4V 10K
TA = 25 C
4.5
REF
VIN - (V)
VIN - (V)
5.0
RESET
5.0 4.5
4.0
4.0
5.0
5.0
RESET - (V)
RESET - (V)
VIN 5V 10K RESET
3.0 1.0 0 -1.0 0 50 100 150 200 250 300 350 400
3.0 1.0 0 -1.0 0 .5 1.0 1.5
4V
REF
2.0
2.5
3.0
3.5
4.0
(t) Time - (ns)
(t) Time - ( s)
8
Copyright (c) 1999 Rev. 1.3 6/99
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
U N D E RV O LTA G E S E N S I N G C I R C U I T
P
RODUCTION
D
ATA
S
HEET
T Y P I C A L A P P L I C AT I O N C I R C U I T S
FIGURE 15. -- LOW VOLTAGE MICROPROCESSOR RESET
VIN RESET POWER SUPPLY CDLY
FIGURE 16. -- SWITCHING THE LOAD OFF WHEN BATTERY REACHES BELOW 4.3V
R MICROPROCESSOR CIRCUIT
VIN
1.2 VREF
LOAD
RESET
A time delayed reset can be accomplished with the addition of CDLY. For systems with extremely fast power supply rise times (< 500ns) it is recommended that the RCDLY time constant be greater than 5.0s. VTH(MPU) is the microprocessor reset input threshold.
1.2 VREF
tDLY = R CDLY In
1 VTH(MPU) 1VIN
FIGURE 17. -- VOLTAGE MONITOR
FIGURE 18. -- MOSFET LOW VOLTAGE GATE DRIVE PROTECTION
VCC 270 VIN RESET RL SMP60N03-10L
1.0k VIN POWER SUPPLY
4.3V
RESET
1.2 VREF
1.2 VREF
Overheating of the logic level power MOSFET due to insufficient gate voltage can be prevented with the above circuit. When the input signal is below the 4.6 volt threshold of the MC34064, its output grounds the gate of the L2 MOSFET.
Copyright (c) 1999 Rev. 1.3 6/99
9
PRODUCT DATABOOK 1996/1997
MC33064/MC34064
TRANSIENT IMMUNE UNDERVOLTAGE SENSING CIRCUIT
P
RODUCTION
D
ATA
S
HEET
T Y P I C A L A P P L I C AT I O N C I R C U I T S
(Cont'd.)
FIGURE 19. -- LOW VOLTAGE MICROPROCESSOR RESET with ADDITIONAL HYSTERESIS
RH IIN
TEST DATA
RL RESET MICROPROCESSOR CIRCUIT
VIN
POWER SUPPLY
VH =
1.2 VREF
4.6 RH + 0.02 RL
VTH (LOWER) = 340 RH x 10-6 Where: RH 150 RL 1.5 10k
Comparator hysteresis can be increased with the addition of resistor RH. The hysteresis equation has been simplified and does not account for the change of input current IIN as VCC crosses the comparator threshold. An increase of the lower threshold VTH (LOWER) will be observed due to IIN which is typically 340A at 4.59V. The equations are accurate to 10% with RH less than 150 and RL between 1.5k and 10k.
VH (mV) 20 51 40 81 71 112 100 164 190 327 276 480
VTH (mV) 0 3.4 6.8 6.8 10 10 16 16 34 34 51 51
RH () 0 10 20 20 30 30 47 47 100 100 150 150
RL () 0 1.5 4.7 1.5 2.7 1.5 2.7 1.5 2.7 1.5 2.7 1.5
FIGURE 20. -- SOLAR POWERED BATTERY CHARGER
VIN SOLAR CELLS
RESET
1.2 VREF
PRODUCTION DATA - Information contained in this document is proprietary to LinFinity, and is current as of publication date. This document may not be modified in any way without the express written consent of LinFinity. Product processing does not necessarily include testing of all parameters. Linfinity reserves the right to change the configuration and performance of the product and to discontinue product at any time.
10
Copyright (c) 1999 Rev. 1.3 6/99

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