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 H E I P N F I N I T E O W E R O F I P N N O VA T I O N R O D U C T I O N 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. ! Ultra-Low Supply Current (500µA Max.) ! Temperature Compensated ICC For Extremely Stable Current Consumption ! µP Reset Function Programmable With 1 External Resistor And Capacitor ! Comparator Hysteresis Prevents Output Oscillation ! Electrically Compatible With Motorola MC34064 ■ Simple 5V Undervoltage Detection SWITCHING REGION (ICC) Supply Current - ( A) ■ Glitch-Free Supply Current During Switching (See Product Highlight) ■ All Microprocessor Or Microcontroller Designs Using 5V Supplies 370 355 ACTIVE REGION 325 ■ Outputs Fully Defined At VIN = 1V (See Figure 1) APPLICATIONS RL = No Load 340 H E E T ■ Monitors 5V Supplies (VT = 4.6V Typ.) I N P U T V O L TA G E 400 385 S ! Pin-to-Pin Compatible With Motorola MC34064/MC34164. PRODUCT HIGHLIGHT VS. A T A K E Y F E AT U R E S NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com. S U P P LY C U R R E N T D 310 MONITOR REGION 295 280 265 250 -10 -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) SOIC DM Plastic 8-pin TO-92 LP Plastic 3-pin 0 to 70 MC34064DM MC34064LP -40 to 85 MC33064DM MC33064LP -55 to 125 — — Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. MC34064DMT) Copyright © 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 T RANSIENT I MMUNE U NDERVOLTAGE S ENSING C IRCUIT P R O D U C T I O N ABSOLUTE MAXIMUM RATINGS D A T A S H E E T PACKAGE PIN OUTS (Note 1) 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) .................................................................................. 150°C Storage Temperature Range ...................................................................... -65°C to 150°C Lead Temperature (Soldering, 10 seconds) ............................................................. 300°C RESET VIN N.C. GROUND 1 8 2 7 3 6 4 5 N.C. N.C. N.C. N.C. DM PACKAGE (Top View) 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. 3. GROUND 2. VIN 1. RESET THERMAL DATA LP PACKAGE (Top View) DM PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 165°C/W LP PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 156°C/W Junction Temperature Calculation: TJ = TA + (PD x θJA). The θJA 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 © 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 D R O D U C T I O N A T A S H E E T 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 Symbol Input Supply Voltage RESET Output Voltage Clamp Diode Forward Current Operating Ambient Temperature Range: MC34064 MC33064 (Note 2) Recommended Operating Conditions Min. Typ. Max. VIN VOUT IF 1 TA TA 0 -40 Units 6.5 V V 70 85 °C °C 6.5 50mA Note 2. Range over which the device is functional. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperatures of 0°C ≤ TA ≤ 70°C for the MC34064 and -40°C ≤ TA ≤ 85°C for the MC33064. Low duty cycle pulse testing techniques are used which maintains junction and case temperatures equal to the ambient temperature.) Parameter Symbol Test Conditions MC34064/MC33064 Min. Typ. Max. Units Comparator Section Threshold Voltage High State Output Low State Output Hysteresis 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 V V V 27 0.02 0.9 1.0 0.4 0.1 60 0.5 1.2 V V V mA µA V 390 500 µA RESET Output Section Output Low Level Saturation Voltage IOL IOH VF 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 ICC VIN = 5.0V VOL Output Low Level Current Output Off-State Leakage Clamp Diode Forward Voltage 10 0.6 Total Device Supply Current Copyright © 1999 Rev. 1.3 6/99 3 PRODUCT DATABOOK 1996/1997 MC33064/MC34064 T RANSIENT I MMUNE U NDERVOLTAGE S ENSING C IRCUIT P R O D U C T I O N D A T A S GRAPH / CURVE INDEX FIGURE INDEX Characteristic Curves FIGURE # H E E T Application Circuits FIGURE # 1. INPUT VOLTAGE and RESET OUTPUT VOLTAGE vs. TIME 15. LOW VOLTAGE MICROPROCESSOR RESET 2. POWER-UP RESET VOLTAGE 16. SWITCHING THE LOAD OFF WHEN BATTERY REACHES BELOW 4.3V 3. POWER-DOWN RESET VOLTAGE 17. VOLTAGE MONITOR 4. RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE 18. MOSFET LOW VOLTAGE GATE DRIVE PROTECTION 5. THRESHOLD VOLTAGE vs. TEMPERATURE 6. THRESHOLD HYSTERESIS vs. TEMPERATURE 19. LOW VOLTAGE MICROPROCESSOR RESET with ADDITIONAL HYSTERESIS 7. SUPPLY CURRENT vs. INPUT VOLTAGE 20. SOLAR POWERED BATTERY CHARGER 8. SUPPLY CURRENT vs. TEMPERATURE 9. LOW LEVEL OUTPUT CURRENT vs TEMPERATURE 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 © 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 R O D U C T I O N D CHARACTERISTIC FIGURE 1. — INPUT VOLTAGE and RESET OUTPUT VOLTAGE vs. TIME CURVES 2.0 RL = 10k 15 RL = 10kohms TA = 25 C 1.8 TA = 25 C Power-Up RESET Voltage - (V) RESET - (V) H E E T FIGURE 2. — POWER-UP RESET VOLTAGE 20 10 5 0 20 VIN - (V) S A T A 15 10 5 1.6 1.4 1.2 1.0 VIN 0.8 0.6 RESET 0.4 0.2 0 0 0 .2 .4 .6 .8 1.0 1.2 1.4 1.6 1.8 2.0 0 0.8 0.4 (t) Time - (ms) 1.6 2.0 (t) Time - (ms) FIGURE 3. — POWER-DOWN RESET VOLTAGE FIGURE 4. — RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE 2.0 5 (VOUT) RESET Output Voltage - (V) RL = 10kohms TA = 25 C 1.8 Power-Down RESET Voltage - (V) 1.2 1.6 1.4 1.2 1.0 VIN 0.8 0.6 0.4 RESET RL = 10kohms TA = 25 C 4 3 2 1 0.2 0 0 0 0.4 0.8 1.2 (t) Time - (ms) Copyright © 1999 Rev. 1.3 6/99 1.6 2.0 4.58 4.59 4.60 4.61 4.62 (VIN) Input Voltage - (V) 5 PRODUCT DATABOOK 1996/1997 MC33064/MC34064 T RANSIENT I MMUNE U NDERVOLTAGE S ENSING C IRCUIT P R O D U C T I O N D CHARACTERISTIC FIGURE 5. — THRESHOLD VOLTAGE vs. TEMPERATURE H E E T CURVES FIGURE 6. — THRESHOLD HYSTERESIS vs. TEMPERATURE 4.7 50 VT+ ; VIN increasing 4.5 - 4.7 VT- ; VIN decreasing 4.7 - 4.5 RL = 10kohms 4.66 46 (VH) Threshold Hysteresis - (mV) 4.68 (VT) Threshold Voltage - (V) S A T A 4.64 VT+ - High Threshold Voltage 4.62 4.6 4.58 VT- - Low Threshold Voltage 4.56 4.54 4.52 42 38 34 30 26 22 18 14 4.5 -55 -25 0 25 50 75 100 125 10 -55 150 -25 (TJ) Temperature - ( C) 25 50 75 100 125 150 (TJ) Temperature - ( C) FIGURE 8. — SUPPLY CURRENT vs. TEMPERATURE FIGURE 7. — SUPPLY CURRENT vs. INPUT VOLTAGE 1000 1000 RL = No Load TA = 25 C 900 800 (ICC) Supply Current - ( A) (ICC) Supply Current - ( A) 0 600 400 200 RL = No Load 800 VIN = 10V 700 600 500 VIN = 5V 400 300 200 100 0 0 2 4 6 (VIN) Input Voltage - (V) 6 8 10 0 -55 -25 0 25 50 75 100 125 150 (TJ) Temperature - ( C) Copyright © 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 R O D U C T I O N D CHARACTERISTIC FIGURE 9. — LOW LEVEL OUTPUT CURRENT vs. TEMPERATURE 40 35 VIN = VOUT = 4V 25 20 15 10 VIN = VOUT = 1V 0 -55 -25 0 25 50 75 100 125 150 (VOL) Low Level Output Saturation Voltage - (mV) (IOL) Low Level Output Current - (mA) 45 5 H E E T CURVES FIGURE 10. — LOW LEVEL OUTPUT SATURATION VOLTAGE vs. TEMPERATURE 50 30 S A T A 400 VIN = 4V 360 320 280 240 200 160 IOL = 8mA 120 80 IOL = 2mA 40 0 -55 -25 0 (TJ) Temperature - ( C) (VF) Clamp Diode Forward Voltage - (V) (VOL) Low Level Output Saturation Voltage - (mV) 100 125 150 1.2 VIN = 1V IOL = 100 A 80 70 60 50 40 30 20 10 RESET = 0V 1.1 -40 C 1 0.9 25 C 0.8 85 C 0.7 0.6 0.5 -25 0 25 50 75 100 (TJ) Temperature - ( C) Copyright © 1999 Rev. 1.3 6/99 75 FIGURE 12. — CLAMP DIODE FORWARD VOLTAGE vs. FORWARD CURRENT 100 0 -55 50 (TJ) Temperature - ( C) FIGURE 11. — LOW LEVEL OUTPUT SATURATION VOLTAGE vs. TEMPERATURE 90 25 125 150 0 10 20 30 40 50 60 70 80 90 100 (IF) Forward Current - (mA) 7 PRODUCT DATABOOK 1996/1997 MC33064/MC34064 T RANSIENT I MMUNE U NDERVOLTAGE S ENSING C IRCUIT P R O D U C T I O N D A T A CHARACTERISTIC FIGURE 13. — PROPAGATION DELAY — HIGH to LOW TA = 25 C 10K 5V 4V 5.0 RESET REF 4.5 5.0 4.5 4.0 4.0 5.0 5.0 3.0 1.0 0 VIN 10K 5V 3.0 4V RESET 1.0 REF 0 -1.0 -1.0 0 50 100 150 200 250 (t) Time - (ns) 8 CURVES 5.5 VIN RESET - (V) RESET - (V) VIN - (V) TA = 25 C H E E T FIGURE 14. — PROPAGATION DELAY — LOW to HIGH VIN - (V) 5.5 S 300 350 400 0 .5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 (t) Time - ( s) Copyright © 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 R O D U C T I O N D A T A S H E E T 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 16. — SWITCHING THE LOAD OFF WHEN BATTERY REACHES BELOW 4.3V FIGURE 15. — LOW VOLTAGE MICROPROCESSOR RESET VIN R RESET POWER SUPPLY CDLY MICROPROCESSOR CIRCUIT VIN LOAD 1.2 VREF 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 5.0µs. VTH(MPU) is the microprocessor reset input threshold. tDLY = R CDLY In 1.2 VREF 1 VTH(MPU) 1VIN FIGURE 17. — VOLTAGE MONITOR FIGURE 18. — MOSFET LOW VOLTAGE GATE DRIVE PROTECTION VCC 1.0k RL 270 4.3V SMP60N03-10L VIN VIN RESET POWER SUPPLY 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 © 1999 Rev. 1.3 6/99 9 PRODUCT DATABOOK 1996/1997 MC33064/MC34064 T RANSIENT I MMUNE U NDERVOLTAGE S ENSING C IRCUIT P R O D U C T I O N D A T A S H E E T 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 TEST DATA RH IIN VIN POWER SUPPLY RL RESET MICROPROCESSOR CIRCUIT VH = 4.6 RH + 0.02 RL ∆VTH (LOWER) = 340 RH x 10-6 1.2 VREF Where: RH ≤ 150Ω RL ≥ 1.5Ω ≤ 10kΩ 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 340µA at 4.59V. The equations are accurate to ±10% with RH less than 150Ω and RL between 1.5kΩ and 10kΩ. 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 (Ω) 0 10 20 20 30 30 47 47 100 100 150 150 RL (Ω) 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 RESET SOLAR CELLS 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 © 1999 Rev. 1.3 6/99