LX7001MY

LX7001 T RANSIENT I MMUNE U NDERVOLTAGE S ENSING C IRCUIT T HE I NFINITE P OWER OF I N N O VAT I O N P RODUCTION D ATA S HEET DESCRIPTION The LX7001 is an improved undervoltage sensing circuit specifically designed for use as a reset controller in microprocessor-based systems. Today's complex miniaturized systems present difficult challanges to the system designer such as overcoming spurious noise problems. The LX7001 is optimized for systems that must be tolerant of high-speed power supply glitches caused by high-speed logic transitions and similar switching phenomena. The LX7001 offers a unique stage that couples glitch immunity with a micropower, ultrastable band-gap reference for precision sensing of undervoltage conditions. It offers the designer an economical, space-efficient solution for low supply voltage detection when used in combination with a single pull-up resistor. Adding one capacitor offers the functionality of a programmable delay time after power returns. Additionally, the LX7001 offers excellent temperature stability. A high-quality trimmed voltage reference and bias circuit permit very accurate and repeatable undervoltage sensing. The remaining blocks consist of a comparator with hysteresis, high current clamping diode and open collector output stage capable of sinking up to 60mA. The LX7001's RESET output is specified to be fully functional at VIN=1V. K E Y F E AT U R E S s Fully Characterized, Transient Immune Input Stage (See Product Highlight) s Monitors 5V Supplies (VTRIP=4.6V Typ.) s Outputs Fully Defined At VCC=1V s Ultra-Low Supply Current (500µA Max. Over Temp) ! 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 ! Pin-to-Pin Compatible With Motorola MC34064/MC34164 NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com. A P P L I C AT I O N S s All Microprocessor Or Microcontroller Designs Using 5V Supplies s Simple 5V Undervoltage Detection PRODUCT HIGHLIGHT INPUT TRANSIENT IMMUNITY 100 (tn) Noise Pulse Width - (µs) 10 ACTIVE 1 IMMUNE 0.1 100 1000 (en) Noise Pulse Amplitude - (mV) PA C K A G E O R D E R I N F O R M AT I O N TA (°C) 0 to 70 -40 to 85 -55 to 125 DM Plastic SOIC 8-pin LX7001CDM LX7001IDM — LP Plastic TO-92 3-pin LX7001CLP LX7001ILP — Y Ceramic Dip 8-pin — — LX7001MY Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number. (i.e. LX7001CDMT) Copyright © 1999 Rev. 1.2 6/99 LINFINITY MICROELECTRONICS INC. 11861 WESTERN AVENUE, GARDEN GROVE, CA. 92841, 714-898-8121, FAX: 714-893-2570 1 PRODUCT DATABOOK 1996/1997 LX7001 T RANSIENT I MMUNE U NDERVOLTAGE S ENSING C IRCUIT P RODUCTION D ATA S HEET A B S O L U T E M A X I M U M R AT I N G S (Note 1) PA C K A G E P I N O U T S RESET VIN N.C. GROUND 1 2 3 4 8 7 6 5 Input Supply Voltage (VIN) ............................................................................... -1V to 12V RESET Output Voltage (VOUT) .......................................................................... -1V to 12V Output Sink Current (IOL) ............................................................ Internally Limited (mA) Clamp Diode Forward Current (IF), Pin 1 to pin 2 ............................................... 100mA Operating Junction Temperature Ceramic (Y - Package) .......................................................................................... 150°C Plastic (DM, LP - Packages) .................................................................................. 150°C Storage Temperature Range ...................................................................... -65°C to 150°C Lead Temperature (Soldering, 10 seconds) ............................................................. 300°C 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. Y PACKAGE (Top View) RESET VIN N.C. GROUND 1 2 3 4 8 7 6 5 N.C. N.C. N.C. N.C. T H E R M A L D ATA DM PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA LP PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA Y PACKAGE: THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA 130°C/W 156°C/W 165°C/W DM PACKAGE (Top View) 3. GROUND 2. VIN 1. RESET 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 LP PACKAGE (Top View) 2 Copyright © 1999 Rev. 1.2 6/99 PRODUCT DATABOOK 1996/1997 LX7001 T RANSIENT I MMUNE U NDERVOLTAGE S ENSING C IRCUIT 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: LX7001C LX7001I LX7001M Note 2. Range over which the device is functional. (Note 2) Symbol VIN VOUT IF Recommended Operating Conditions Min. Typ. Max. 1 10 50mA 0 -25 -55 70 85 125 10 Units V V °C °C °C ELECTRICAL CHARACTERISTICS (Unless otherwise specified, these specifications apply over the operating ambient temperatures of 0°C ≤ TA ≤ 70°C for the LX7001C, -40°C ≤ TA ≤ 85°C for the LX7001I, and -55°C ≤ TA ≤ 125°C for the LX7001M. 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 LX7001C/7001I/7001M Min. Typ. Max. Units VT+ VTVH VIN Increasing — 4V to 5V VIN Decreasing — 5V to 4V 4.5 4.5 0.01 4.62 4.60 0.02 0.06 0.25 0.3 40 0.01 0.02 0.82 345 4.7 4.7 0.05 1.0 0.4 0.1 60 0.5 2.0 1.2 500 V V V V V V mA µA µA V µA RESET Output Section Output Sink Saturation Voltage VOL Output Sink 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 VOUT = 4.0V VOUT = 5.0V VOUT = 10V Pin 1 to pin 2, IF = 10mA VIN = 5.0V 10 0.6 Total Device Supply Current Copyright © 1999 Rev. 1.2 6/99 3 PRODUCT DATABOOK 1996/1997 LX7001 T RANSIENT I MMUNE U NDERVOLTAGE S ENSING C IRCUIT P RODUCTION D ATA S HEET BLOCK DIAGRAM VIN RESET 1.2 VREF GROUND GRAPH / CURVE INDEX FIGURE INDEX Characteristic Curves FIGURE # 1. 2. 3. 4. 5. 6. 7. 8. 9. RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE POWER-UP 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 LOW LEVEL OUTPUT VOLTAGE vs. LOW LEVEL OUTPUT CURRENT FIGURE # Application Circuits 13. LOW VOLTAGE MICROPROCESSOR RESET 14. SWITCHING THE LOAD OFF WHEN BATTERY REACHES BELOW 4.3V 15. VOLTAGE MONITOR 16. MOSFET LOW VOLTAGE GATE DRIVE PROTECTION 17. LOW VOLTAGE MICROPROCESSOR RESET with ADDITIONAL HYSTERESIS 10. VOLTAGE vs. CLAMP DIODE FORWARD CURRENT 11. PROPAGATION DELAY 12. LOW LEVEL OUTPUT VOLTAGE vs. TEMPERATURE 4 Copyright © 1999 Rev. 1.2 6/99 PRODUCT DATABOOK 1996/1997 LX7001 T RANSIENT I MMUNE U NDERVOLTAGE S ENSING C IRCUIT P RODUCTION D ATA S HEET CHARACTERISTIC CURVES FIGURE 1. — RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE 10 FIGURE 2. — POWER-UP RESET VOLTAGE 2.0 RL = 10K (VOUT) RESET Output Voltage - (V) Power-Up RESET Voltage - (V) TA = 25 C 8 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 VIN 6 4 RESET 2 0 0 2 4 6 8 10 0 0 100 200 300 400 500 (VIN) Input Voltage - (V) (t) Time - ( s) FIGURE 3. — RESET OUTPUT VOLTAGE vs. INPUT VOLTAGE 5 FIGURE 4. — THRESHOLD VOLTAGE vs. TEMPERATURE 4.64 (VOUT) RESET Output Voltage - (V) VT+ Upper Threshold High State Output (VT) Threshold Voltage - (V) 4 4.62 3 4.60 VT- Lower Threshold Low State Output 4.58 2 1 4.56 0 4.55 4.56 4.57 4.58 4.59 4.60 4.61 4.62 4.63 4.64 4.65 4.54 -55 -25 0 25 50 75 100 125 150 (VIN) Input Voltage - (V) (TJ) Temperature - ( C) Copyright © 1999 Rev. 1.2 6/99 5 PRODUCT DATABOOK 1996/1997 LX7001 T RANSIENT I MMUNE U NDERVOLTAGE S ENSING C IRCUIT P RODUCTION D ATA S HEET CHARACTERISTIC CURVES FIGURE 5. — THRESHOLD HYSTERESIS vs. TEMPERATURE 30 FIGURE 6. — SUPPLY CURRENT vs. INPUT VOLTAGE 1000 RESET Load = 10K (VH) Hysteresis Voltage - (mV) -55 C (ICC) Supply Current - ( A) 26 800 -40 C +25 C 22 600 18 400 +85 C +125 C 200 14 10 -55 0 -25 0 25 50 75 100 125 150 0 2 4 6 8 10 (TJ) Temperature - ( C) (VIN) Input Voltage - (V) FIGURE 7. — SUPPLY CURRENT vs. TEMPERATURE FIGURE 8. — LOW LEVEL OUTPUT CURRENT vs. TEMPERATURE 80 1300 1200 1100 (IOL) Low Level Output Current - (mA) 70 60 50 40 30 20 10 0 -55 (ICC) Supply Current - ( A) 1000 900 800 700 600 500 400 300 200 100 0 -55 -25 0 25 50 75 100 125 150 10V 5V -25 0 25 50 75 100 125 150 (TJ) Temperature - ( C) (TJ) Temperature - ( C) 6 Copyright © 1999 Rev. 1.2 6/99 PRODUCT DATABOOK 1996/1997 LX7001 T RANSIENT I MMUNE U NDERVOLTAGE S ENSING C IRCUIT P RODUCTION D ATA S HEET CHARACTERISTIC CURVES FIGURE 9. — LOW LEVEL OUTPUT VOLTAGE vs. LOW LEVEL OUTPUT CURRENT 2000 FIGURE 10. — VOLTAGE vs. CLAMP DIODE FORWARD CURRENT 1.2 (VOL) Low Level Output Voltage - (mV) VIN = 4V -55 C 1500 25 C 125 C 1000 RESET = 0V 1.1 -40 C -55 C (VF) Forward Voltage - (V) 1 0.9 0.8 125 C 0.7 25 C 0.6 85 C 500 0 0 10 20 30 40 0.5 0 10 20 30 40 50 60 70 80 90 100 (ISINK) Low Level Output Current - (mA) (IF) Forward Current - (mA) FIGURE 11. — PROPAGATION DELAY 5.5 FIGURE 12. — LOW LEVEL OUTPUT VOLTAGE vs. TEMPERATURE 80 10K (VOL) Low Level Output Voltage - (mV) TA = 25 C VIN 5V 4V VIN - (V) 5.0 4.5 RESET 70 60 50 40 30 20 10 0 -55 VIN = 1V ISINK = 100 A REF 4.0 6.0 RESET - (V) 4.0 2.0 0 0 2 4 6 8 10 12 14 16 -25 0 25 50 75 100 125 150 (t) Time - ( s) (TJ) Temperature - ( C) Copyright © 1999 Rev. 1.2 6/99 7 PRODUCT DATABOOK 1996/1997 LX7001 T RANSIENT I MMUNE U NDERVOLTAGE S ENSING C IRCUIT 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 13. — LOW VOLTAGE MICROPROCESSOR RESET. FIGURE 14. — SWITCHING THE LOAD OFF WHEN BATTERY REACHES BELOW 4.3V. VIN RESET POWER SUPPLY R MICROPROCESSOR CIRCUIT CDLY 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 5.0µs. VTH(MPU) is the microprocessor reset input threshold. 1.2 VREF tDLY = R CDLY In 1 VTH(MPU) 1VIN FIGURE 15. — VOLTAGE MONITOR. FIGURE 16. — MOSFET LOW VOLTAGE GATE DRIVE PROTECTION. VCC 1.0k VIN POWER SUPPLY 4.3V VIN 270 RL SMP60N03-10L RESET 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 4.3 volt threshold of the LX7001C, its output grounds the gate of the L2 MOSFET. 8 Copyright © 1999 Rev. 1.2 6/99 PRODUCT DATABOOK 1996/1997 LX7001 T RANSIENT I MMUNE U NDERVOLTAGE S ENSING C IRCUIT 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 (Con't.) FIGURE 17. — LOW VOLTAGE MICROPROCESSOR RESET with ADDITIONAL HYSTERESIS. TEST DATA RH IIN VIN RL RESET MICROPROCESSOR CIRCUIT POWER SUPPLY VH = 1.2 VREF 4.6 RH + 0.02 RL ∆VTH (LOWER) = 340 RH x 10-6 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 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. Copyright © 1999 Rev. 1.2 6/99 9