LTC1440/LTC1441/LTC1442 Ultralow Power Single/Dual Comparator with Reference DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO

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1 LTC/LTC/LTC Ultralow Power Single/Dual Comparator with Reference FEATURES Ultralow Quiescent Current:.µA Typ (LTC) Reference Output Drives.µF Capacitor Adjustable Hysteresis (LTC/LTC) Wide Supply Range: Single: V to V Dual: ±V to ±.V Input Voltage Range Includes the Negative Supply TTL/CMOS Compatible Outputs µs Propagation Delay with mv Overdrive No Crowbar Current ma Continuous Source Current Pin Compatible Upgrades for MAX9/9/9 mm x mm x.mm DFN Package (LTC) APPLICATIO S U Battery-Powered System Monitoring Threshold Detectors Window Comparators Oscillator Circuits, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. DESCRIPTIO U The LTC /LTC/LTC are ultralow power single and dual comparators with built-in references. The comparators feature less than.µa supply current over temperature (LTC), a.v ±% reference, programmable hysteresis (LTC/LTC) and TTL/CMOS outputs that sink and source current. The reference output can drive a bypass capacitor of up to.µf without oscillation. The comparators operate from a single V to V supply or a dual ±V to ±.V supply (LTC). Comparator hysteresis is easily programmed by using two resistors and the pin (LTC/LTC). Each comparator s input operates from the negative supply to within.v of the positive supply. The comparator output stage can continuously source up to ma. By eliminating the cross-conducting current that normally happens when the comparator changes logic states, the power supply glitches are eliminated. The LTC is available in -pin PDIP, SO, MSOP and DFN packages. The LTC/LTC are available in -pin PDIP and SO packages. TYPICAL APPLICATIO R.M % R.M % IN IN.V V U Micropower.9V V CC Threshold Detector SUPPLY CURRENT (µa) LTC Supply Current vs Temperature V = V = GND = V LTC GND.. TEMPERATURE ( C) // TA TA fd

2 LTC/LTC/LTC ABSOLUTE MAXIMUM RATINGS (Note ) W W W Voltage V to, V to GND, GND to...v to.v IN, IN,... (V.V) to (.V)... (V.V) to (.V) (LTC)... (V.V) to (GND.V) (LTC/LTC)... (V.V) to (.V) Current IN, IN,... ma... ma... ma U Short-Circuit Duration (V.V)...Continuous Power Dissipation... mw Operating Temperature Range LTCXC... C to C LTCXI... C to C Storage Temperature Range... C to C Storage Temperature Range (DD Package)... C to C Junction Temperature... C Junction Temperature (DD Package)... C Lead Temperature (Soldering, sec)... C PACKAGE/ORDER INFORMATION GND IN IN T JMAX = C, θ JA = C/ W (DD) UNDERSIDE METAL CONNECTED TO (PCB CONNECTION OPTIONAL) ORDER PART NUMBER LTCCDD LTCIDD A IN A IN A N PACKAGE -LEAD PDIP TOP VIEW TOP VIEW DD PART MARKING* LBTH V DD PACKAGE -LEAD (mm mm) PLASTIC DFN B V IN B IN B S PACKAGE -LEAD PLASTIC SO T JMAX = C, θ JA = C/ W (N) T JMAX = C, θ JA = C/ W (S) U W U GND IN IN N PACKAGE -LEAD PDIP T JMAX = C, θ JA = C/ W (N) T JMAX = C, θ JA = C/ W (S) ORDER PART NUMBER LTCCN LTCCS LTCIN LTCIS ORDER PART NUMBER LTCCN LTCCS LTCIN LTCIS S PART MARKING I TOP VIEW V S PACKAGE -LEAD PLASTIC SO S PART MARKING I I A IN A IN B N PACKAGE -LEAD PDIP TOP VIEW ORDER PART NUMBER LTCCMS LTCIMS GND IN IN T JMAX = C, θ JA = C/ W (N) T JMAX = C, θ JA = C/ W (S) MS PACKAGE -LEAD PLASTIC MSOP T JMAX = C, θ JA = C/ W B V S PACKAGE -LEAD PLASTIC SO Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: TOP VIEW V MS PART MARKING* LTBX ORDER PART NUMBER LTCCN LTCCS LTCIN LTCIS S PART MARKING I Consult LTC Marketing for parts specified with wider operating temperature ranges. * The temperature grade is identified by a label on the shipping container. fd

3 LTC/LTC/LTC ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T A = C. V = V and = GND = V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Power Supply V Supply Voltage Range.. V I CC Supply Current IN = IN mv LTC C T A C.. µa = (LTC/LTC) C T A C. µa LTC.. µa LTC.. µa Comparator V OS Comparator Input Offset Voltage V CM =.V ± ± mv I IN Input Leakage Current (IN, IN ) V IN = IN =.V ±. ±. na Input Leakage Current () ±. ±. na V CM Comparator Input Common V.V V Mode Range CMRR Common Mode Rejection Ratio to V.V. mv/v PSRR Power Supply Rejection Ratio V = V to V (LTC). mv/v V =.V to V (LTC/LTC). mv/v NOISE Voltage Noise Hz to khz µv RMS V Hysteresis Input Voltage Range LTC/LTC mv V t PD Propagation Delay C = pf Overdrive = mv µs Overdrive = mv µs V OH Output High Voltage I O = ma V.V V V OL Output Low Voltage I O =.ma LTC GND.V V LTC/LTC.V V Reference V Reference Voltage No Load LTC/LTC C T A C..9 V C T A C.. V LTC (MSOP, DFN).. V I SOURCE Reference Output Source Current V mv (LTC) µa I SINK Reference Output Sink Current V.mV (LTC) µa V Reference Source Current I SOURCE ma (LTC). mv Reference Sink Current I SINK µa (LTC).. mv mv NOISE Voltage Noise Hz to khz µv RMS fd

4 LTC/LTC/LTC ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T A = C. V = V and = GND = V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Power Supply V Supply Voltage Range V I CC Supply Current IN = IN mv LTC C T A C.9 µa = (LTC/LTC) C T A C. µa LTC.. µa LTC.. µa Comparator V OS Comparator Input Offset Voltage V CM =.V ± ± mv I IN Input Leakage Current (IN, IN ) V IN = IN =.V ±. ± na Input Leakage Current () ±. ± na V CM Comparator Input Common V.V V Mode Range CMRR Common Mode Rejection Ratio to V.V. mv/v PSRR Power Supply Rejection Ratio V = V to V (LTC). mv/v V =.V to V (LTC/LTC). mv/v NOISE Voltage Noise Hz to khz µv RMS V Hysteresis Input Voltage Range LTC/LTC mv V t PD Propagation Delay C = pf Overdrive = mv µs Overdrive = mv µs V OH Output High Voltage I O = ma V.V V Comparator V OL Output Low Voltage I O =.ma LTC GND.V V LTC/LTC.V V Reference V Reference Voltage No Load LTC/LTC C T A C...9 V C T A C.. V LTC (MSOP, DFN).. V I SOURCE Reference Output Source Current V mv (LTC) µa I SINK Reference Output Sink Current V.mV (LTC) µa V Reference Source Current I SOURCE ma (LTC).. mv Reference Sink Current I SINK µa (LTC).. mv mv NOISE Voltage Noise Hz to khz µv RMS Note : Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. fd

5 TYPICAL PERFOR A CE CHARACTERISTICS UW LTC/LTC/LTC INPUT VOLTAGE (mv) PUT VOLTAGE (V) Comparator Response Time vs Input Overdrive T A = C mv mv mv mv RESPONSE TIME (µs) // G INPUT VOLTAGE (mv) PUT VOLTAGE (V) Comparator Response Time vs Input Overdrive T A = C mv mv mv mv RESPONSE TIME (µs) // G SINK CURRENT (ma) Comparator Short-Circuit Sink Current vs Supply Voltage T A = C CONNECTED TO V 9 SUPPLY VOLTAGE (V) // G SOURCE CURRENT (ma) Comparator Short-Circuit Source Current vs Supply Voltage CONNECTED TO = GND = V SUPPLY VOLTAGE (V) // G fd

6 LTC/LTC/LTC TYPICAL PERFOR A CE CHARACTERISTICS UW Comparator Response Time vs Load Capacitance with mv Input Overdrive Comparator Response Time at Low Supply Voltage RESPONSE TIME (µs) t PHL t PLH RESPONSE TIME (µs) mv OVERDRIVE mv OVERDRIVE LOAD CAPACITANCE (nf) SUPPLY VOLTAGE (V) // G // G Comparator Output Voltage High vs Load Current T A = C PUT VOLTAGE HIGH (V) V = V V = V V = V LOAD CURRENT (ma) // G fd

7 TYPICAL PERFOR A CE CHARACTERISTICS UW LTC/LTC/LTC PUT VOLTAGE LOW (V)..... Comparator Output Voltage Low vs Load Current T A = C V = V V = V V = V LOAD CURRENT (ma) // G POSITIVE-TO-NEGATIVE INPUT VOLTAGE (mv) LTC/LTC Hysteresis Control PUT HIGH PUT LOW V V (mv) // G9 LTC Supply Current vs Temperature SUPPLY CURRENT (µa) V = V = V V = V = GND = V V = V = GND = V TEMPERATURE ( C) // G fd

8 LTC/LTC/LTC TYPICAL PERFOR A CE CHARACTERISTICS UW ERENCE PUT VOLTAGE (V) Reference Output Voltage vs Output Load Current V CC = V SOURCE ERENCE PUT VOLTAGE (V) Reference Output Voltage vs Output Load Current (Sink) V CC = V SINK V CC = V PUT LOAD CURRENT (ma). PUT LOAD CURRENT (µa) // G // G Reference Voltage vs Temperature.. ERENCE VOLTAGE (V) TEMPERATURE ( C) // G fd

9 LTC/LTC/LTC PIN FUNCTIONS U U U GND LTC A LTC B A LTC B IN V V A B IN A IN B IN A A B V IN IN A IN B IN B // PD LTC GND (Pin ): Ground. Connect to for single supply operation. (Pin ): Negative Supply. Connect to ground for single supply operation. Potential should be more negative than GND. IN (Pin ): Noninverting Comparator Input. Input common mode range from to V.V. Input current typically pa at C. IN (Pin ): Inverting Comparator Input. Input common mode range from to V.V. Input current typically pa at C. (Pin ): Hysteresis Input. Connect to if not used. Input voltage range is from V to V mv. (Pin ): Reference Output..V with respect to. Can source up to µa and sink µa at C. Drive.µF bypass capacitor without oscillation. V (Pin ): Positive Supply. V to V. (Pin ): Comparator CMOS Output. Swings from GND to V. Output can source up to ma and sink ma. LTC A (Pin ): Comparator A CMOS Output. Swings from to V. Output can source up to ma and sink ma. (Pin ): Negative Supply. IN A (Pin ): Noninverting Input of Comparator A. Input common mode range from to V.V. Input current typically pa at C. IN A (Pin ): Inverting Input of Comparator A. Input common mode range from to V.V. Input current typically pa at C. IN B (Pin ): Inverting Input of Comparator B. Input common mode range from to V.V. Input current typically pa at C. IN B (Pin ): Noninverting Input of Comparator B. Input common mode range from to V.V. Input current typically pa at C. V (Pin ): Positive Supply. V to V. B (Pin ): Comparator B CMOS Output. Swings from to V. Output can source up to ma and sink ma. LTC A (Pin ): Comparator A CMOS Output. Swings from to V. Output can source up to ma and sink ma. (Pin ): Negative Supply. IN A (Pin ): Noninverting Input of Comparator A. Input common mode range from to V.V. Input current typically pa at C. IN B (Pin ): Inverting Input of Comparator B. Input common mode range from to V.V. Input current typically pa at C. (Pin ): Hysteresis Input. Connect to if not used. Input voltage range is from V to V mv. (Pin ): Reference Output..V with respect to. Can source up to µa and sink µa at C. Drive.µF bypass capacitor without oscillation. V (Pin ): Positive Supply. V to V. B (Pin ): Comparator B CMOS Output. Swings from to V. Output can source up to ma and sink ma. fd 9

10 LTC/LTC/LTC APPLICATIONS INFORMATION U W U U LTC/LTC/LTC are a family of micropower comparators with built-in.v reference. Features include programmable hysteresis (LTC/LTC), wide supply voltage range (V to V) and the ability of the reference to drive up to a.µf capacitor without oscillation. The comparators CMOS outputs can source up to ma and the supply current glitches, that normally occur when switching logic states, have been eliminated. Power Supplies The comparator family operates from a single V to V supply. The LTC includes a separate ground for the comparator output stage, allowing a split supply ranging from ±V to ±.V. Connecting to GND on the LTC will allow single supply operation. If the comparator output is required to source more than ma, or the supply source impedance is high, V should be bypassed with a.µf capacitor. Comparator Inputs The comparator inputs can swing from the negative supply to within.v max of the positive supply V. The inputs can be forced mv below or above V without damage and the typical input leakage current is only ±pa. Comparator Outputs The LTC comparator output swings between GND and V to assure TTL compatibility with a split supply. The LTC and LTC outputs swing between and V. The outputs are capable of sourcing up to ma and sinking up to ma while still maintaining microampere quiescent currents. The output stage does not generate crowbar switching currents during transitions which helps minimize parasitic feedback through the supply pins. Voltage Reference The internal bandgap reference has a voltage of.v referenced to. The reference accuracy is.% from C to C. It can source up to µa and sink up to µa with a V supply. The reference can drive a bypass capacitor of up to.µf without oscillation and by inserting a series resistor, capacitance values up to µf can be used (Figure ). Figure shows the resistor value required for different capacitor values to achieve critical damping. Bypassing the reference can help prevent false tripping of the comparators by preventing glitches on V or reference load transients from disturbing the reference output voltage. Figure shows the bypassed reference output with a square wave applied to the V pin. Resistors R and R set mv of hysteresis voltage band while R damps the reference response. Note that the comparator output doesn t trip. ERENCE PUT RESISTOR VALUE (kω) R C LTCX // F Figure. Damping the Reference Output.... CAPACITOR VALUE (µf) // F Figure. Damping Resistance vs Bypass Capacitor Value fd

APPLICATIONS INFORMATION U W U U IN IN V LTC/LTC/LTC up to %. If hysteresis is not wanted, the pin should be shorted to. Acceptable values for I range from.µa to µa. If.M is chosen for R, then the value of R is equal to the value of V HB.

11 APPLICATIONS INFORMATION U W U U IN IN V LTC/LTC/LTC up to %. If hysteresis is not wanted, the pin should be shorted to. Acceptable values for I range from.µa to µa. If.M is chosen for R, then the value of R is equal to the value of V HB. V TO V R k R.M R Ω C µf LTC GND V R = HB I ()(I ) R LTC V (. HB ) R = I R // F // Fa Figure. Programmable Hysteresis Figure a. Reference Transient Response Test Circuit mv/div V V V V Level Detector The LTC is ideal for use as a micropower level detector as shown in Figure. R and R form a voltage divider from V IN to the noninverting comparator input. R and R set the hysteresis voltage, and R and C bypass the reference output. The following design procedure can be used to select the component values:. Choose the V IN voltage trip level, in this example.v. ms/div // Fb V IN V Figure b. Reference and Comparator Output Transient Response Hysteresis Hysteresis can be added to the LTC by connecting a resistor (R) between the and pins and a second resistor (R) from to (Figure ). The difference between the upper and lower threshold voltages, or hysteresis voltage band (V HB ), is equal to twice the voltage difference between the and pins. When more hysteresis is added, the upper threshold increases the same amount as the low threshold decreases. The maximum voltage allowed between and pins is mv, producing a maximum hysteresis voltage band of mv. The hysteresis band could vary by R.M % R.M % R k % R.M % R Ω % C µf IN IN V LTC GND Figure. Glitch-Free Level Detector with Hysteresis // F fd

12 LTC/LTC/LTC APPLICATIONS INFORMATION U W U U. Calculate the required resistive divider ratio. Ratio = V /V IN Ratio =.V/.V =.. Choose the required hysteresis voltage band at the input V HBIN, in this example mv. Calculate the hysteresis voltage band referred to the comparator input V HB. V HB = (V HBIN )(Ratio) V HB = (mv)(.) V HB =.mv. Choose the values for R and R to set the hysteresis. R =.M R(kΩ) = V HB = k. Choose the values for R and R to set the trip point. V R. V = = =. M IBIAS µ A V R = R IN V V HB. V R =. M mv V. R =. M Low Voltage Operation It is important to note that the voltage references internal to the LTC and LTC can exceed the common mode range of the comparators at low supply voltages. The input common mode range of the LTC/LTC/ LTC comparators is guaranteed to extend up to (V -.V). Therefore, if one of the comparator inputs is at the.v reference voltage, the minimum supply voltage is.v for a valid output reading. The guaranteed minimum operating voltage for the LTC/LTC/LTC is V (or ±V). However, both the reference and comparator(s) will function with a supply voltage as low as.v, but performance will degrade as the voltage goes below V. The voltage reference temperature coefficient will degrade slightly, and the comparators will have less output drive with an increase in propagation delay. At the reduced supply voltages, the input common mode range of the comparator(s) will still typically extend from the negative supply to approximately.v below the positive supply. fd

13 LTC/LTC/LTC TYPICAL APPLICATIONS U -Bit µa A/D Converter V M.kHz V LT.V N9 k k* E IN V TO V C / LTC k C / LTC pf.m STATUS k.µf POLYSTYRENE *TRW-IRC MRT/ppm/ C N9 M C VNLL CONV COMMAND Q D Q C CLK C C C DATA // TA.kHz Watch Crystal Oscillator V M.kHz k / LTC.M pf // TA fd

14 LTC/LTC/LTC PACKAGE DESCRIPTIO U DD Package -Lead Plastic DFN (mm mm) (Reference LTC DWG # --9). ±. R =. TYP. ±.. ±.. ±.. ±. ( SIDES). ±.. BSC. ±. ( SIDES) PACKAGE LINE RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS PIN TOP MARK (NOTE ).. ±. ( SIDES). ±.... ±. ( SIDES). ±.. BSC. ±. ( SIDES) BOTTOM VIEW EXPOSED PAD NOTE:. DRAWING TO BE MADE A JEDEC PACKAGE LINE M-9 VARIATION OF (WEED-). DRAWING NOT TO SCALE. ALL DIMENSIONS ARE IN MILLIMETERS. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED.mm ON ANY SIDE. EXPOSED PAD SHALL BE SOLDER PLATED. SHADED AREA IS ONLY A ERENCE FOR PIN LOCATION ON TOP AND BOTTOM OF PACKAGE (DD) DFN MS Package -Lead Plastic MSOP (Reference LTC DWG # --).9 ±. (. ±.). (.) MIN.. (..). ±. (. ±.) TYP GAUGE PLANE. (.). (.) DETAIL A. (.) BSC RECOMMENDED SOLDER PAD LAY NOTE:. DIMENSIONS IN MILLIMETER/(INCH). DRAWING NOT TO SCALE TYP. ±. (. ±.) DETAIL A SEATING PLANE. ±. (. ±.) (NOTE ).9 ±. (.9 ±.). (.) MAX.. (.9.) TYP. (.) BSC. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED.mm (.") PER SIDE. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED.mm (.") PER SIDE. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE.mm (.") MAX. (.). ±. (. ±.) (NOTE ). (.). ±. (. ±.) MSOP (MS) fd

15 LTC/LTC/LTC PACKAGE DESCRIPTION U N Package -Lead PDIP (Narrow.) (LTC DWG # --).* (.) MAX. ±.* (. ±.).. (..).. (..). ±. (. ±.).. (..) ( ). (.) TYP. (.) BSC NOTE: INCHES. DIMENSIONS ARE MILLIMETERS *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED. INCH (.mm). (.) MIN. ±. (. ±.). (.) MIN N S Package -Lead Plastic Small Outline (Narrow.) (LTC DWG # --). BSC. ±..9.9 (..) NOTE. MIN. ±... (.9.9).. (..9) NOTE. ±. TYP RECOMMENDED SOLDER PAD LAY.. (..).. (..) TYP..9 (..).. (..)....9 (..) (..) NOTE: INCHES TYP. DIMENSIONS IN (MILLIMETERS). DRAWING NOT TO SCALE. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED." (.mm). (.) BSC Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. SO fd

16 LTC/LTC/LTC TYPICAL APPLICATION U khz V/F Converter V.V TO V LM k* INPUT V TO V.M* khz TRIM k.µf C / LTC.µF pf Q Q LT-. LT-. Q.µF Q k = HP- = N = N Q Q k M TYP Hz TRIM pf** Q * = % METAL FILM ** = POLYSTYRENE Q M.M.µF C f khz TO khz C / LTC // TA RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LTC.V Reference with Micropower Quad Comparators % Accuracy,.µA Maximum Current, Ref Output Drives.µF LTC/LTC.V Reference with Quad Comparator % Accuracy,.µA Maximum Current, Ref Output Drives.µF with Adjustable Hysteresis LTC.V Reference with Nanopower Comparator DFN Package.µA Quiescent Current (Typical), Reference with Adjustable Hysteresis Drives.µF LTC.V Reference with Micropower Amplifier and Comparator DFN Package.% Accuracy, Rail-to-Rail Out, Low Offset Amplifier LTC/LTC.V Reference with Dual Comparators % Accuracy, Open-Drain Out, Reference Drives.µF with Adjustable Hysteresis LTC99. Reference with Comparator with Adjustable Thesholds Li-Ion Low Battery Monitor, SOT, % Accuracy LT-. Reference with Low Voltage Dual Comparators SOT,.V to.v Supply Range, ±% Over Temperature LT-/LT- Linear Technology Corporation McCarthy Blvd., Milpitas, CA 9- () -9 FAX: () - fd LT REV D PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 99

LTC1443/LTC1444/LTC1445 Ultralow Power Quad Comparators with Reference Description. Features. Applications. Typical Application

LTC1443/LTC1444/LTC1445 Ultralow Power Quad Comparators with Reference Description. Features. Applications. Typical Application Features n Ultralow Quiescent Current:.µA Max n Reference Output Drives.µF Capacitor n Adjustable Hysteresis (LTC/LTC) n Wide Supply Range Single: V to V Dual: ±V to ±.V n Input Voltage Range Includes