LTC1440IMS8

LTC1440/LTC1441/LTC1442 Ultralow Power Single/Dual Comparator with Reference U DESCRIPTION FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Ultralow Quiescent Current: 2.1µA Typ (LTC1440) Wide Supply Range: Single: 2V to 11V Dual: ±1V to ±5.5V Input Voltage Range Includes the Negative Supply Reference Output Drives 0.01µF Capacitor Adjustable Hysteresis (LTC1440/LTC1442) TTL/CMOS Compatible Outputs 12µs Propagation Delay with 10mV Overdrive No Crowbar Current 40mA Continuous Source Current Pin Compatible Upgrades for MAX921/922/923 U APPLICATIONS ■ ■ ■ ■ Battery-Powered System Monitoring Threshold Detectors Window Comparators Oscillator Circuits , LTC and LT are registered trademarks of Linear Technology Corporation. The LTC ®1440/LTC1441/LTC1442 are ultralow power single and dual comparators with built-in references. The comparators feature less than 3.7µA supply current over temperature (LTC1440), a 1.182V ±1% reference, programmable hysteresis (LTC1440/LTC1442) and TTL/CMOS outputs that sink and source current. The reference output can drive a bypass capacitor of up to 0.01µF without oscillation. The comparators operate from a single 2V to 11V supply or a dual ±1V to ±5.5V supply (LTC1440). Comparator hysteresis is easily programmed by using two resistors and the HYST pin (LTC1440/LTC1442). Each comparator’s input operates from the negative supply to within 1.3V of the positive supply. The comparator output stage can continuously source up to 40mA. By eliminating the cross-conducting current that normally happens when the comparator changes logic states, the power supply glitches are eliminated. The LTC1440 is available in 8-pin PDIP, SO and MSOP packages. The LTC1441/LTC1442 are available in 8-pin PDIP and SO packages. U TYPICAL APPLICATION Micropower 2.9V VCC Threshold Detector LTC1440 Supply Current vs Temperature 3.3V 5.0 R2 1.13M 1% 7 V+ 3 IN + 4.5 + 8 4 IN– – 5 HYST LTC1440 6 REF V– 2 OUT SUPPLY CURRENT (µA) R1 1.65M 1% V + = 5V V – = GND = 0V 4.0 3.5 3.0 2.5 2.0 1.5 –40 –20 GND 1 40 20 60 0 TEMPERATURE (°C) 80 100 1440/1/2 TA02 1440 TA01 1 LTC1440/LTC1441/LTC1442 U W W W ABSOLUTE MAXIMUM RATINGS Voltage V + to V –, V + to GND, GND to V – ...........12V to – 0.3V IN +, IN –, HYST ................. (V + + 0.3V) to (V – – 0.3V) REF ................................... (V + + 0.3V) to (V – – 0.3V) OUT (LTC1440) .............. (V + + 0.3V) to (GND – 0.3V) OUT (LTC1441/LTC1442) ... (V + + 0.3V) to (V – – 0.3V) Current IN +, IN –, HYST ................................................. 20mA REF ................................................................... 20mA OUT .................................................................. 50mA OUT Short-Circuit Duration (V + ≤ 5.5V) ...... Continuous Power Dissipation............................................. 500mW Operating Temperature Range LTC144XC .............................................. 0°C to 70°C LTC144XI .......................................... – 40°C to 85°C Storage Temperature Range ................ – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C W U U PACKAGE/ORDER INFORMATION ORDER PART NUMBER TOP VIEW 8 OUT 2 7 V + IN + 3 6 REF – 4 5 HYST N8 PACKAGE 8-LEAD PDIP S8 PACKAGE 8-LEAD PLASTIC SO GND 1 V IN – LTC1440CN8 LTC1440CS8 LTC1440IN8 LTC1440IS8 1 2 3 4 OUT A 1 8 OUT B V– 2 7 V+ IN A + 3 6 IN B + 4 5 – N8 PACKAGE 8-LEAD PDIP S8 PACKAGE 8-LEAD PLASTIC SO IN B TJMAX = 150°C, θJA = 130°C/ W (N8) TJMAX = 150°C, θJA = 175°C/ W (S8) S8 PART MARKING LTC1440CMS8 OUT V+ REF HYST MS8 PART MARKING TJMAX = 150°C, θJA = 250°C/ W LTC1441CN8 LTC1441CS8 LTC1441IN8 LTC1441IS8 S8 PART MARKING 1441 1441I 8 7 6 5 MS8 PACKAGE 8-LEAD PLASTIC MSOP ORDER PART NUMBER TOP VIEW IN A TOP VIEW GND V– IN + IN – 1440 1440I TJMAX = 150°C, θJA = 130°C/ W (N8) TJMAX = 150°C, θJA = 175°C/ W (S8) – ORDER PART NUMBER LTBX ORDER PART NUMBER TOP VIEW LTC1442CN8 LTC1442CS8 LTC1442IN8 LTC1442IS8 OUT A 1 8 OUT B V– 2 7 V+ IN A+ 3 6 REF – 4 5 HYST N8 PACKAGE 8-LEAD PDIP S8 PACKAGE 8-LEAD PLASTIC SO IN B S8 PART MARKING 1442 1442I TJMAX = 150°C, θJA = 130°C/ W (N8) TJMAX = 150°C, θJA = 175°C/ W (S8) Consult factory for Military grade parts. ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER Power Supply V+ Supply Voltage Range ICC Supply Current 2 V + = 5V, V – = GND = 0V, TA = 25°C unless otherwise noted. CONDITIONS MIN ● IN + = IN – = 80mV HYST = REF (LTC1440/LTC1442) LTC1440 LTC1441 LTC1442 ● ● ● TYP MAX UNITS 2.1 3.5 3.5 11.0 3.7 5.7 5.7 V µA µA µA 2.0 LTC1440/LTC1441/LTC1442 ELECTRICAL CHARACTERISTICS V + = 5V, V – = GND = 0V, TA = 25°C unless otherwise noted. SYMBOL PARAMETER CONDITIONS Comparator VOS Comparator Input Offset Voltage VCM = 2.5V Input Leakage Current (IN +, IN –) VIN + = VIN – = 2.5V IIN Input Leakage Current (HYST) VCM Comparator Input Common Mode Range CMRR Common Mode Rejection Ratio V – to V + – 1.3V PSRR Power Supply Rejection Ratio V + = 2V to 11V NOISE Voltage Noise 100Hz to 100kHz VHYST Hysteresis Input Voltage Range LTC1440/LTC1442 tPD Propagation Delay COUT = 100pF VOH VOL Output High Voltage Output Low Voltage Reference VREF Reference Voltage IO = – 13mA IO = 1.8mA MIN ● ● ● ● TYP MAX UNITS ±3 ±0.01 ±0.02 ±10 ±1.0 ±1.0 V + – 1.3V 1 1 mV nA nA V mV/V mV/V µVRMS V µs µs V V V V– 0.1 0.1 100 ● REF – 50mV Overdrive = 10mV Overdrive = 100mV ● LTC1440 LTC1441/LTC1442 ISOURCE ISINK ∆VREF Reference Output Source Current Reference Output Sink Current Reference Source Current Reference Sink Current No Load C Temp Range LTC1440/LTC1442 I Temp Range No Load LTC1440 (MSOP) C Temp Range ∆VREF ≤ 1mV (LTC1442) ∆VREF ≤ 2.5mV (LTC1442) 0 ≤ ISOURCE ≤ 2mA (LTC1440) 0 ≤ ISINK ≤ 10µA (LTC1440) NOISE Voltage Noise 100Hz to 100kHz REF 15 8 V + – 0.4V GND + 0.4V V – + 0.4V ● ● ● ● ● ● 1.170 1.164 1.164 100 10 ● 1.182 200 20 0.8 0.5 ● V + = 2V to 11V 100Hz to 100kHz LTC1440/LTC1442 COUT = 100pF VOH VOL IO = – 8mA IO = 0.8mA Output High Voltage Output Low Voltage ● LTC1440 LTC1441 LTC1442 VCM = 1.5V VIN + = VIN – = 1.5V 2 2 3.5 3.5 ● ● ● ±3 ±0.01 ±0.02 ● ● ● ● V – to 5 1.5 5 V– V + – 1.3V 0.1 0.1 100 ● REF – 50mV Overdrive = 10mV Overdrive = 100mV LTC1440 LTC1441/LTC1442 11 3.6 5.7 5.7 ±10 ±1 ±1 V + – 1.3V 1 1 REF 14 5 ● ● ● V V V µA µA mV mV mV µVRMS 100 V + = 3V, V – = GND = 0V, TA = 25°C unless otherwise noted. Power Supply V+ Supply Voltage Range ICC Supply Current IN + = IN – = 80mV HYST = REF (LTC1440/LTC1442) Comparator VOS Comparator Input Offset Voltage Input Leakage Current (IN +, IN –) IIN Input Leakage Current (HYST) VCM Comparator Input Common Mode Range CMRR Common Mode Rejection Ratio PSRR Power Supply Rejection Ratio NOISE Voltage Noise VHYST Hysteresis Input Voltage Range tPD Propagation Delay 1.194 1.200 1.200 V + – 0.4V GND + 0.4V V – + 0.4V V µA µA µA mV nA nA V mV/V mV/V µVRMS V µs µs V V V 3 LTC1440/LTC1441/LTC1442 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER Reference VREF Reference Voltage ISOURCE ISINK ∆VREF V + = 3V, V – = GND = 0V, TA = 25°C unless otherwise noted. CONDITIONS No Load C Temp Range LTC1440/LTC1442 I Temp Range No Load LTC1440 (MSOP) C Temp Range ∆VREF ≤ 1mV (LTC1442) ∆VREF ≤ 2.5mV (LTC1442) 0 ≤ ISOURCE ≤ 1mA (LTC1440) 0 ≤ ISINK ≤ 10µA (LTC1440) Reference Output Source Current Reference Output Sink Current Reference Source Current Reference Sink Current ● ● ● ● MIN TYP MAX UNITS 1.170 1.164 1.164 60 10 1.182 1.194 1.200 1.200 V V V µA µA mV mV mV 120 20 0.8 0.5 ● ● NOISE Voltage Noise 100Hz to 100kHz 5.5 1.5 5 µVRMS 100 The ● denotes specifications which apply over the full operating temperature range. U W TYPICAL PERFORMANCE CHARACTERISTICS Comparator Response Time vs Input Overdrive Comparator Response Time vs Input Overdrives 3 100mV 50mV 10mV 20mV 2 1 0 0 100 –1 0 2 4 6 RESPONSE TIME (µs) 8 10 200 5 TA = 25°C 4 TA = 25°C 180 100mV 3 50mV 160 20mV SINK CURRENT (mA) 4 OUTPUT VOLTAGE (V) TA = 25°C INPUT VOLTAGE (mV) INPUT VOLTAGE (mV) OUTPUT VOLTAGE (V) 5 Comparator Short-Circuit Sink Current vs Supply Voltage 10mV 2 1 0 100 140 OUT CONNECTED TO V + 120 100 80 60 40 0 20 0 –1 0 4 6 8 10 12 14 16 18 RESPONSE TIME (µs) 2 1440/1/2 G01 0 1 2 3 4 5 6 7 8 SUPPLY VOLTAGE (V) Comparator Response Time vs Load Capacitance with 100mV Input Overdrive Comparator Response Time at Low Supply Voltage 10000 12 160 10 1440/1/2 G03 1440/1/2 G02 Comparator Short-Circuit Source Current vs Supply Voltage 9 140 OUT CONNECTED TO V – = GND = 0V 100 80 60 40 t PHL RESPONSE TIME (µs) RESPONSE TIME (µs) SOURCE CURRENT (mA) 10 120 8 t PLH 6 1000 20mV OVERDRIVE 100 10 100mV OVERDRIVE 4 20 0 1 2 3 SUPPLY VOLTAGE (V) 4 5 1440/1/2 G04 4 1 2 0 0 20 60 80 40 LOAD CAPACITANCE (nF) 100 1440/1/2 G05 1.0 1.1 1.2 1.3 1.4 SUPPLY VOLTAGE (V) 1.5 1.6 1440/1/2 G06 LTC1440/LTC1441/LTC1442 U W TYPICAL PERFORMANCE CHARACTERISTICS Comparator Output Voltage Low vs Load Current Comparator Output Voltage High vs Load Current TA = 25°C TA = 25°C OUTPUT VOLTAGE HIGH (V) V + = 5V 4 3 V + = 3V 2 V + = 2V 1 20 30 40 LOAD CURRENT (mA) 50 2.0 V + = 2V 1.5 V + = 5V 1.0 0.5 0 60 V + = 3V 0 10 20 30 40 50 60 LOAD CURRENT (mA) 1440/1/2 G07 70 80 80 60 OUTPUT HIGH 40 20 0 OUTPUT LOW –20 –40 –60 –80 0 10 20 30 VREF – VHYST (mV) 1440/1/2 G08 LTC1440 Supply Current vs Temperature 40 50 1440/1/2 G09 Reference Output Voltage vs Output Load Current 1.190 6 5 V + = 5V V – = –5V 4 3 V + = 3V – V = GND = 0V 2 V + = 5V – REFERENCE OUTPUT VOLTAGE (V) VCC = 5V SUPPLY CURRENT (µA) 1.185 SOURCE 1.180 1.175 1.170 1.165 1.160 V = GND = 0V 1.155 1 –60 –40 –20 0 20 40 60 80 100 120 140 TEMPERATURE (°C) 0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT LOAD CURRENT (mA) 1440/1/2 G10 Reference Output Voltage vs Output Load Current (Sink) Reference Voltage vs Temperature 1.186 1.200 V CC = 2V 1.184 1.195 V CC = 5V 1.190 1.185 SINK 1.180 1.175 1.170 3.5 1440/1/2 G11 REFERENCE VOLTAGE (V) 10 REFERENCE OUTPUT VOLTAGE (V) 0 POSITIVE-TO-NEGATIVE INPUT VOLTAGE (mV) 2.5 5 OUTPUT VOLTAGE HIGH (V) LTC1440/LTC1442 Hysteresis Control 1.182 1.180 1.178 1.176 1.174 1.172 0 25 10 15 20 5 OUTPUT LOAD CURRENT (µA) 30 1440/1/2 G12 1.170 –60 –40 –20 0 20 40 60 80 100 120 140 TEMPERATURE (°C) 1440/1/2 G13 5 LTC1440/LTC1441/LTC1442 U U U PIN FUNCTIONS 1 GND LTC1440 – 2 V OUT 8 1 OUT A 7 2 V– V+ + 3 IN+ 4 IN– OUT B 8 V+ + – LTC1441 A – – B 7 2 V– LTC1442 + 3 IN A+ IN B+ 6 5 4 IN A– IN B– 5 – – 8 V+ 7 + + REF 6 3 IN A 4 IN B– OUT B B A + REF 6 HYST 1 OUT A V– HYST 5 1440/1/2 PD LTC1440 GND (Pin 1): Ground. Connect to V – for single supply operation. V – (Pin 2): Negative Supply. Connect to ground for single supply operation. Potential should be more negative than GND. IN + (Pin 3): Noninverting Comparator Input. Input common mode range from V – to V + –1.3V. Input current typically 10pA at 25°C. IN B – (Pin 5): Inverting Input of Comparator B. Input common mode range from V – to V + –1.3V. Input current typically 10pA at 25°C. IN B + (Pin 6): Noninverting Input of Comparator B. Input common mode range from V – to V + –1.3V. Input current typically 10pA at 25°C. V + (Pin 7): Positive Supply. 2V to 11V. OUT B (Pin 8): Comparator B CMOS Output. Swings from V – to V +. Output can source up to 40mA and sink 5mA. IN – (Pin 4): Inverting Comparator Input. Input common mode range from V – to V + –1.3V. Input current typically 10pA at 25°C. LTC1442 HYST (Pin 5): Hysteresis Input. Connect to REF if not used. Input voltage range is from VREF to VREF – 50mV. V – (Pin 2): Negative Supply. REF (Pin 6): Reference Output. 1.182V with respect to V –. Can source up to 200µA and sink 15µA at 25°C. Drive 0.01µF bypass capacitor without oscillation. IN A+ (Pin 3): Noninverting Input of Comparator A. Input common mode range from V – to V + –1.3V. Input current typically 10pA at 25°C. V + (Pin 7): Positive Supply. 2V to 11V. IN B– (Pin 4): Inverting Input of Comparator B. Input common mode range from V – to V + –1.3V. Input current typically 10pA at 25°C. OUT (Pin 8): Comparator CMOS Output. Swings from GND to V +. Output can source up to 40mA and sink 5mA. LTC1441 OUT A (Pin 1): Comparator A CMOS Output. Swings from V – to V +. Output can source up to 40mA and sink 5mA. V – (Pin 2): Negative Supply. IN A+ (Pin 3): Noninverting Input of Comparator A. Input common mode range from V – to V + –1.3V. Input current typically 10pA at 25°C. IN A– (Pin 4): Inverting Input of Comparator A. Input common mode range from V – to V + –1.3V. Input current typically 10pA at 25°C. 6 OUT A (Pin 1): Comparator A CMOS Output. Swings from V – to V +. Output can source up to 40mA and sink 5mA. HYST (Pin 5): Hysteresis Input. Connect to REF if not used. Input voltage range is from VREF to VREF – 50mV. REF (Pin 6): Reference Output. 1.182V with respect to V –. Can source up to 200µA and sink 15µA at 25°C. Drive 0.01µF bypass capacitor without oscillation. V + (Pin 7): Positive Supply. 2V to 11V. OUT B (Pin 8): Comparator B CMOS Output. Swings from V – to V +. Output can source up to 40mA and sink 5mA. LTC1440/LTC1441/LTC1442 U W U U APPLICATIONS INFORMATION LTC1440/LTC1441/LTC1442 are a family of micropower comparators with built-in 1.182V reference. Features include programmable hysteresis (LTC1440/LTC1442), wide supply voltage range (2V to 11V) and the ability of the reference to drive up to a 0.01µF capacitor without oscillation. The comparators’ CMOS outputs can source up to 40mA and the supply current glitches, that normally occur when switching logic states, have been eliminated. capacitor of up to 0.01µF without oscillation and by inserting a series resistor, capacitance values up to 100µF can be used (Figure 1). Power Supplies Figure 3 shows the bypassed reference output with a square wave applied to the V + pin. Resistors R2 and R3 set 10mV of hysteresis voltage band while R1 damps the reference response. Note that the comparator output doesn’t trip. The comparator family operates from a single 2V to 11V supply. The LTC1440 includes a separate ground for the comparator output stage, allowing a split supply ranging from ±1V to ±5.5V. Connecting V – to GND on the LTC1440 will allow single supply operation. If the comparator output is required to source more than 1mA, or the supply source impedance is high, V + should be bypassed with a 0.1µF capacitor. Figure 2 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. REFERENCE OUTPUT REF R1 Comparator Inputs The comparator inputs can swing from the negative supply V – to within 1.3V max of the positive supply V +. The inputs can be forced 300mV below V – or above V + without damage and the typical input leakage current is only ±10pA. C1 LTC144X V– 1440/1/2 F01 Figure 1. Damping the Reference Output Comparator Outputs Voltage Reference The internal bandgap reference has a voltage of 1.182V referenced to V –. The reference accuracy is 1.5% from – 40°C to 85°C. It can source up to 200µA and sink up to 20µA with a 5V supply. The reference can drive a bypass 1000 RESISTOR VALUE (kΩ) The LTC1440 comparator output swings between GND and V + to assure TTL compatibility with a split supply. The LTC1441 and LTC1442 outputs swing between V – and V +. The outputs are capable of sourcing up to 40mA and sinking up to 5mA 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. 100 10 1 0.1 0.001 0.01 0.1 1 CAPACITOR VALUE (µF) 10 1440/1/2 F02 Figure 2. Damping Resistance vs Bypass Capacitor Value 7 LTC1440/LTC1441/LTC1442 U U W U APPLICATIONS INFORMATION 7 V+ 3 IN + + 8 4 IN– 5V TO 8V OUT up to 15%. If hysteresis is not wanted, the HYST pin should be shorted to REF. Acceptable values for IREF range from 0.1µA to 5µA. If 2.4M is chosen for R2, then the value of R1 is equal to the value of VHB. – 5 HYST 6 IREF R2 10k R3 2.4M R1 430Ω 5 V– 2 C1 1µF HYST R2 = V R2 GND VHB (2)(IREF) ( 1.182V – VHB 2 ) IREF – 2 1 1440/1/2 F04 Figure 4. Programmable Hysteresis 1440/1/2 F03a Figure 3a. Reference Transient Response Test Circuit Level Detector The LTC1440 is ideal for use as a micropower level detector as shown in Figure 5. R1 and R2 form a voltage divider from VIN to the noninverting comparator input. R3 and R4 set the hysteresis voltage, and R5 and C1 bypass the reference output. The following design procedure can be used to select the component values: 8V V+ 5V 2mV/DIV LTC1440 R1 LTC1440 6 REF R1 = REF VREF 1. Choose the VIN voltage trip level, in this example 4.65V. OUT 2ms/DIV 1440/1/2 F03b Figure 3b. Reference and Comparator Output Transient Response Hysteresis Hysteresis can be added to the LTC1440 by connecting a resistor (R1) between the REF and HYST pins and a second resistor (R2) from HYST to V – (Figure 4). The difference between the upper and lower threshold voltages, or hysteresis voltage band (VHB), is equal to twice the voltage difference between the REF and HYST pins. When more hysteresis is added, the upper threshold increases the same amount as the low threshold decreases. The maximum voltage allowed between REF and HYST pins is 50mV, producing a maximum hysteresis voltage band of 100mV. The hysteresis band could vary by 8 V IN 5V R2 3.4M 1% 7 V+ 3 IN + + 8 R1 1.18M 1% 4 IN– OUT – 5 HYST R3 15k 1% R4 2.4M 1% LTC1440 6 REF R5 430Ω 5% C1 1µF V– 2 GND 1 1440/1/2 F05 Figure 5. Glitch-Free Level Detector with Hysteresis LTC1440/LTC1441/LTC1442 U W U U APPLICATIONS INFORMATION 2. Calculate the required resistive divider ratio.     4.65V R2 = 1.18M  − 1 15mV    1.182V + 2  R2 = 3.40M Ratio = VREF / VIN Ratio = 1.182V/4.65V = 0.254 3. Choose the required hysteresis voltage band at the input VHBIN, in this example 60mV. Calculate the hysteresis voltage band referred to the comparator input VHB. VHB = (VHBIN)(Ratio) Low Voltage Operation VHB = (60mV)(0.254) The guaranteed minimum operating voltage is 2V or (±1V). As the total supply voltage is reduced below 2V, the performance degrades and the supply current falls. Both the reference and the comparator are still functioning with supply voltage down to 1.5V. The reference will have slightly worse temperature coefficient. While the comparator would have less output drive and the propagation delay increases. The useful input voltage range extends from the negative supply to a little under 1V below the positive supply, which is slightly closer to the positive rail than the device operating from higher supply voltages. VHB = 15.24mV 4. Choose the values for R3 and R4 to set the hysteresis. R4 = 2.4M R3(kΩ) = VHB = 15k 5. Choose the values for R1 and R2 to set the trip point. V 1.182V R1 = REF = = 1.18M IBIAS 1µA     VIN R2 = R1 − 1 VHB    VREF + 2  U TYPICAL APPLICATIONS Low Battery Detect Operates Down to 1.5V 7 2-CELL NiCd V+ 2.6M 3 IN + LTC1440 + 8 1M 4 IN– – OUT V+ 6 REF 20k 5 1.3M HYST GND 1 V– 1440 TA06 2 1M 9 LTC1440/LTC1441/LTC1442 U TYPICAL APPLICATIONS 10-Bit 30µA A/D Converter 32.768kHz 1M 5V 470k + C2 1/2 LTC1441 5V EIN 0V TO 3V – 1.2M LT®1034 1.2V 100k 10pF 365k* + C1 1/2 LTC1441 2N3809 STATUS – 150k 0.033µF POLYSTYRENE VN2222LL 1N914 74C00 10M Q 74C00 74C00 DATA OUT Q 74C74 74C00 D CLK CONV COMMAND *TRW-IRC MRT–5/+120ppm/°C 1440/1/2 TA03 32.768kHz “Watch Crystal” Oscillator 32.768kHz 1M +V 470k + 1/2 LTC1441 OUT – 1.2M 10pF 1440/1/2 TA05 10 LTC1440/LTC1441/LTC1442 U PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted. N8 Package 8-Lead PDIP (Narrow 0.300) (LTC DWG # 05-08-1510) 0.400* (10.160) MAX 8 7 6 5 1 2 3 4 0.255 ± 0.015* (6.477 ± 0.381) 0.300 – 0.325 (7.620 – 8.255) 0.065 (1.651) TYP 0.009 – 0.015 (0.229 – 0.381) ( +0.635 –0.381 0.125 (3.175) MIN 0.005 (0.127) MIN +0.025 0.325 –0.015 8.255 0.130 ± 0.005 (3.302 ± 0.127) 0.045 – 0.065 (1.143 – 1.651) ) 0.015 (0.380) MIN 0.018 ± 0.003 (0.457 ± 0.076) 0.100 ± 0.010 (2.540 ± 0.254) N8 0695 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm) S8 Package 8-Lead Plastic Small Outline (Narrow 0.150) (LTC DWG # 05-08-1610) 0.189 – 0.197* (4.801 – 5.004) 8 7 6 5 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) 1 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 2 3 4 0.053 – 0.069 (1.346 – 1.752) 0.004 – 0.010 (0.101 – 0.254) 0°– 8° TYP 0.016 – 0.050 0.406 – 1.270 *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 0.014 – 0.019 (0.355 – 0.483) 0.050 (1.270) 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. SO8 0695 11 LTC1440/LTC1441/LTC1442 U TYPICAL APPLICATION 10kHz V/F Converter +V 6.2V TO 12V LM334 2k* INPUT 0V TO 5V Q8 Q1 + LT1034-1.2 2.2µF 10kHz TRIM 200k 1.2M* C1 1/2 LTC1441 0.01µF + LT1034-1.2 – 0.47µF Q2 + 50pF Q3 100k Q4 2M TYP 100Hz TRIM = HP5082-2810 15k = 1N4148 Q5 = 2N2222 Q7 100pF** fOUT 0kHz TO 10kHz * = 1% METAL FILM ** = POLYSTYRENE Q6 74C14 10M 2.7M 0.1µF – C2 1/2 LTC1441 + 1440/1/2 TA04 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1178/LT1179 Dual/Quad 17µA Precision Single Supply Op Amps 70µV Max VOS, 5nA Max IBIAS LT1351 Single 250µA, 3MHz, 200V/µs Op Amp with Shutdown C-LoadTM Op Amp Stable Driving Any Capacitive Load LT1352/LT1353 Dual/Quad 250µA, 3MHz, 200V/µs Op Amps C-Load Op Amps Stable Driving Any Capacitive Load LTC1443/LTC1444/LTC1445 Micropower Quad Comparator with 1% Reference LTC1443 Has 1.182V Reference, LTC1444/LTC1445 Have 1.221V Reference and Adjustable Hysteresis C-Load is a trademark of Linear Technology Corporation. 12 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408)432-1900 FAX: (408) 434-0507● TELEX: 499-3977 ● www.linear-tech.com 144012fa LT/TP 0298 REV A 2K • PRINTED IN USA ●  LINEAR TECHNOLOGY CORPORATION 1996