FEATURES DESCRIPTIO U - analog.com

1 1 LTC1440/LTC1441/LTC1442144012fdAPPLICATI O SUUltralow Power Single/DualComparator with ReferenceV+ 2178 GNDOUTLTC14401440 TA01IN+IN HYSTREF3456 +TEMPERATURE ( C) TA02 2004080100 SUPPLY CURRENT ( A)V+ = 5VV = GND = 0 VMicropower VCC Threshold DetectorLTC1440 Supply Current vs TemperatureThe LTC 1440/LTC1441/LTC1442 are ultralow powersingle and dual comparators with built-in references. Thecomparators feature less than A supply current overtemperature (LTC1440), a 1% reference, pro-grammable hysteresis (LTC1440/LTC1442) and TTL/CMOS outputs that sink and source current.

2 The reference outputcan drive a bypass capacitor of up to F comparators operate from a single 2V to 11V supplyor a dual 1V to supply (LTC1440). Comparatorhysteresis is easily programmed by using two resistorsand the HYST pin (LTC1440/LTC1442). Each comparator sinput operates from the negative supply to within ofthe positive supply. The comparator output stage cancontinuously source up to 40mA. By eliminating thecross-conducting current that normally happens when thecomparator changes logic states, the power supply glitchesare LTC1440 is available in 8-pin PDIP, SO, MSOP andDFN packages.

3 The LTC1441/LTC1442 are available in8-pin PDIP and SO packages. Battery-Powered System Monitoring Threshold Detectors Window Comparators Oscillator Circuits Ultralow Quiescent Current: A Typ (LTC1440) Reference Output Drives F Capacitor Adjustable Hysteresis (LTC1440/LTC1442) Wide Supply Range:Single: 2V to 11 VDual: 1V to Input Voltage Range Includes the Negative Supply TTL/CMOS Compatible Outputs 12 s Propagation Delay with 10mV Overdrive No Crowbar Current 40mA Continuous Source Current Pin Compatible Upgrades for MAX921/922/923 3mm x 3mm x DFN Package (LTC1440)FEATURESDESCRIPTIOUTYPICAL APPLICATIOU, LT, LTC and LTM are registered trademarks of Linear Technology other trademarks are the property of their respective PARTMARKINGV oltageV+ to V , V+ to GND, GND to V.

4 12V to +, IN , HYST .. (V+ + ) to (V )REF .. (V+ + ) to (V )OUT (LTC1440) .. (V+ + ) to (GND )OUT (LTC1441/LTC1442) .. (V+ + ) to (V )CurrentIN+, IN , HYST .. 20mAREF .. 20mAOUT .. 50mAABSOLUTE MAXIMUM RATINGSWWWUOUT Short-Circuit Duration (V+ ) .. ContinuousPower Dissipation .. 500mWOperating Temperature RangeLTC144XC .. 0 C to 70 CLTC144XI .. 40 C to 85 CStorage Temperature Range .. 65 C to 150 CStorage Temperature Range(DD Package) .. 65 C to 125 CJunction Temperature .. 150 CJunction Temperature (DD Package).

5 125 CLead Temperature (Soldering, 10 sec) .. 300 CPACKAGE/ORDER INFORMATIONWUUC onsult LTC Marketing for parts specified with wider operating temperature ranges.* The temperature grade is identified by a label on the shipping container.(Note 1)TJMAX = 150 C, JA = 130 C/ W (N8)TJMAX = 150 C, JA = 175 C/ W (S8)TJMAX = 150 C, JA = 250 C/ WORDER PARTNUMBERLTC1440 CDDLTC1440 IDDDD8 PARTMARKING*LBTHORDER PARTNUMBERLTC1440 CMS8 LTC1440 IMS8MS8 PARTMARKING*LTBXORDER PARTNUMBERLTC1440CN8 LTC1440CS8 LTC1440IN8 LTC1440IS8S8 PARTMARKING144014401440I1440 ITJMAX = 125 C, JA = 160 C/ W (DD)UNDERSIDE METAL CONNECTED TO V (PCB CONNECTION OPTIONAL)

6 12348765 TOP VIEWGNDV IN+IN OUTV+REFHYSTS8 PACKAGE8-LEAD PLASTIC SON8 PACKAGE8-LEAD PDIPORDER PARTNUMBERORDER PARTNUMBERS8 PARTMARKING14411441 ITJMAX = 150 C, JA = 130 C/ W (N8)TJMAX = 150 C, JA = 175 C/ W (S8)TJMAX = 150 C, JA = 130 C/ W (N8)TJMAX = 150 C, JA = 175 C/ W (S8)12348765 TOP VIEWOUT AV IN A+IN A OUT BV+IN B+IN B S8 PACKAGE8-LEAD PLASTIC SON8 PACKAGE8-LEAD PDIP12348765 TOP VIEWOUT AV IN A+IN B OUT BV+REFHYSTS8 PACKAGE8-LEAD PLASTIC SON8 PACKAGE8-LEAD PDIPLTC1441CN8 LTC1441CS8 LTC1441IN8 LTC1441IS8 LTC1442CN8 LTC1442CS8 LTC1442IN8 LTC1442IS814421442I1234 GNDV IN+IN 8765 OUTV+REFHYSTTOP VIEWMS8 PACKAGE8-LEAD PLASTIC MSOPTOP VIEWDD PACKAGE8-LEAD (3mm 3mm) PLASTIC DFN56784321 GNDV IN+IN OUTV+REFHYSTO rder Options Tape and Reel: Add #TRLead Free: Add #PBF Lead Free Tape and Reel.

7 Add #TRPBFLead Free Part Marking: CHARACTERISTICSThe denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA = 25 C. V+ = 5V and V = GND = 0V unless otherwise PARAMETERCONDITIONSMINTYPMAXUNITSP ower SupplyV+Supply Voltage Range CurrentIN+ = IN + 80mVLTC1440 0 C TA 70 C AHYST = REF (LTC1440/LTC1442) 40 C TA 85 C ALTC1441 ALTC1442 AComparatorVOSC omparator Input Offset VoltageVCM = 3 10mVIINI nput Leakage Current (IN+, IN )VIN+ = VIN = Leakage Current (HYST) Input Common V V+ RangeCMRRC ommon Mode Rejection RatioV to V+ Supply Rejection RatioV+ = 2V to 11V (LTC1441)

8 + = to 11V (LTC1440/LTC1442) Noise100Hz to 100kHz100 VRMSVHYSTH ysteresis Input Voltage RangeLTC1440/LTC1442 REF 50mVREFVtPDPropagation DelayCOUT = 100pFOverdrive = 10mV15 sOverdrive = 100mV 8 sVOHO utput High VoltageIO = 13mA V+ Low VoltageIO = GND + V + VoltageNo LoadLTC1440/LTC14420 C TA 70 C 40 C TA 85 C (MSOP, DFN) Output Source Current VREF 1mV (LTC1442) 100 AISINKR eference Output Sink Current VREF (LTC1442)1020 A VREFR eference Source Current0 ISOURCE 2mA (LTC1440) Sink Current0 ISINK 10 A (LTC1440) 5mVNOISEV oltage Noise100Hz to 100kHz100 VRMS4 LTC1440/LTC1441/LTC1442144012fdELECTRICA L CHARACTERISTICSThe denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA = 25 C.

9 V+ = 3V and V = GND = 0V unless otherwise 1: Stresses beyond those listed under Absolute Maximum Ratingsmay cause permanent damage to the device. Exposure to any AbsoluteMaximum Rating condition for extended periods may affect devicereliability and PARAMETERCONDITIONSMINTYPMAXUNITSP ower SupplyV+Supply Voltage Range 211 VICCS upply CurrentIN+ = IN + 80mVLTC1440 0 C TA 70 C AHYST = REF (LTC1440/LTC1442) 40 C TA 85 C ALTC1441 ALTC1442 AComparatorVOSC omparator Input Offset VoltageVCM = 3 10mVIINI nput Leakage Current (IN+, IN )VIN+ = VIN = 1nAInput Leakage Current (HYST)

10 1nAVCMC omparator Input Common V V+ RangeCMRRC ommon Mode Rejection RatioV to V+ Supply Rejection RatioV+ = 2V to 11V (LTC1441) + = to 11V (LTC1440/LTC1442) Noise100Hz to 100kHz100 VRMSVHYSTH ysteresis Input Voltage RangeLTC1440/LTC1442 REF 50mVREFVtPDPropagation DelayCOUT = 100pFOverdrive = 10mV14 sOverdrive = 100mV 5 sVOHO utput High VoltageIO = 8mA V+ Low VoltageIO = GND + V + VoltageNo LoadLTC1440/LTC14420 C TA 70 C 40 C TA 85 C (MSOP, DFN) Output Source Current VREF 1mV (LTC1442) 60120 AISINKR eference Output Sink Current VREF (LTC1442)1020 A VREFR eference Source Current0 ISOURCE 1mA (LTC1440) Sink Current0 ISINK 10 A (LTC1440) 5mVNOISEV oltage Noise100Hz to 100kHz100 VRMS5 LTC1440/LTC1441/LTC1442144012fdRESPONSE TIME ( s) 1 INPUT VOLTAGE (mV)OUTPUT VOLTAGE (V)0016141851440/1/2 G021002104121608234100mV10mV50mV20mVTA = 25 CRESPONSE TIME ( s) 1 INPUT VOLTAGE (mV)OUTPUT VOLTAGE (V)