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1 ltc1440/ltc1441/ltc1442 144012fd applicatio s u ultralow power single/dual comparator with reference v + r1 1.65m 1% r2 1.13m 1% 3.3v v C 21 7 8 gnd out ltc1440 1440 ta01 in + in C hyst ref 3 4 5 6 C + temperature ( c) C40 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 20 60 1440/1/2 ta02 C20 0 40 80 100 supply current ( a) v + = 5v v C = gnd = 0v micropower 2.9v v cc threshold detector ltc1440 supply current vs temperature the ltc ? 1440/ltc1441/ltc1442 are ultralow power single and dual comparators with built-in references. the comparators feature less than 3.7 a supply current over temperature (ltc1440), a 1.182v 1% reference, pro- grammable hysteresis (ltc1440/ltc1442) and ttl/cmos outputs that sink and source current. the reference output can drive a bypass capacitor of up to 0.01 f 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 comparators 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, msop and dfn packages. the ltc1441/ltc1442 are available in 8-pin pdip and so packages. battery-powered system monitoring threshold detectors window comparators oscillator circuits ultralow quiescent current: 2.1 a typ (ltc1440) reference output drives 0.01 f capacitor adjustable hysteresis (ltc1440/ltc1442) wide supply range: single: 2v to 11v dual: 1v to 5.5v 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 0.75mm dfn package (ltc1440) features descriptio u typical applicatio u , lt, ltc and ltm are registered trademarks of linear technology corporation. all other trademarks are the property of their respective owners.
2 ltc1440/ltc1441/ltc1442 144012fd s8 part marking voltage v + to v C , v + to gnd, gnd to v C ...........12v to C 0.3v in + , in C , hyst ................. (v + + 0.3v) to (v C C 0.3v) ref ................................... (v + + 0.3v) to (v C C 0.3v) out (ltc1440) .............. (v + + 0.3v) to (gnd C 0.3v) out (ltc1441/ltc1442) ... (v + + 0.3v) to (v C C 0.3v) current in + , in C , hyst ................................................. 20ma ref ................................................................... 20ma out .................................................................. 50ma absolute m axi m u m ratings w ww u out short-circuit duration (v + 5.5v) ....... continuous power dissipation .............................................. 500mw operating temperature range ltc144xc ............................................... 0 c to 70 c ltc144xi ........................................... C 40 c to 85 c storage temperature range ................. C 65 c to 150 c storage temperature range (dd package) ................................... C 65 c to 125 c junction temperature ........................................... 150 c junction temperature (dd package) .................... 125 c lead temperature (soldering, 10 sec).................. 300 c package/order i n for m atio n w u u consult ltc marketing for parts specified with wider operating temperature ranges. * the temperature grade is identified by a label on the shipping container. (note 1) t jmax = 150 c, ja = 130 c/ w (n8) t jmax = 150 c, ja = 175 c/ w (s8) t jmax = 150 c, ja = 250 c/ w order part number ltc1440cdd ltc1440idd dd8 part marking* lbth order part number ltc1440cms8 ltc1440ims8 ms8 part marking* ltbx order part number ltc1440cn8 ltc1440cs8 ltc1440in8 ltc1440is8 s8 part marking 1440 1440 1440i 1440i t jmax = 125 c, ja = 160 c/ w (dd) underside metal connected to v C (pcb connection optional) 1 2 3 4 8 7 6 5 top view gnd v C in + in C out v + ref hyst s8 package 8-lead plastic so n8 package 8-lead pdip order part number order part number s8 part marking 1441 1441i t jmax = 150 c, ja = 130 c/ w (n8) t jmax = 150 c, ja = 175 c/ w (s8) t jmax = 150 c, ja = 130 c/ w (n8) t jmax = 150 c, ja = 175 c/ w (s8) 1 2 3 4 8 7 6 5 top view out a v C in a + in a C out b v + in b + in b C s8 package 8-lead plastic so n8 package 8-lead pdip 1 2 3 4 8 7 6 5 top view out a v C in a + in b C out b v + ref hyst s8 package 8-lead plastic so n8 package 8-lead pdip ltc1441cn8 ltc1441cs8 ltc1441in8 ltc1441is8 ltc1442cn8 ltc1442cs8 ltc1442in8 ltc1442is8 1442 1442i 1 2 3 4 gnd v C in + in C 8 7 6 5 out v + ref hyst top view ms 8 package 8 -lead plastic msop top view dd package 8-lead (3mm 3mm) plastic dfn 5 6 7 8 4 3 2 1 gnd v C in + in C out v + ref hyst order options tape and reel: add #tr lead free: add #pbf lead free tape and reel: add #trpbf lead free part marking: http://www.linear.com/leadfree/
3 ltc1440/ltc1441/ltc1442 144012fd electrical characteristics the denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v + = 5v and v = gnd = 0v unless otherwise noted. symbol parameter conditions min typ max units power supply v + supply voltage range 2.0 11.0 v i cc supply current in + = in C + 80mv ltc1440 0 c t a 70 c 2.1 4.0 a hyst = ref (ltc1440/ltc1442) C40 c t a 85 c 4.4 a ltc1441 3.5 5.7 a ltc1442 3.5 5.7 a comparator v os comparator input offset voltage v cm = 2.5v 3 10 mv i in input leakage current (in + , in C )v in + = v in C = 2.5v 0.01 1.0 na input leakage current (hyst) 0.02 1.0 na v cm comparator input common v C v + C 1.3v v mode range cmrr common mode rejection ratio v C to v + C 1.3v 0.1 1 mv/v psrr power supply rejection ratio v + = 2v to 11v (ltc1441) 0.1 1 mv/v v + = 2.5v to 11v (ltc1440/ltc1442) 0.1 1 mv/v noise voltage noise 100hz to 100khz 100 v rms v hyst hysteresis input voltage range ltc1440/ltc1442 ref C 50mv ref v t pd propagation delay c out = 100pf overdrive = 10mv 15 s overdrive = 100mv 8 s v oh output high voltage i o = C 13ma v + C 0.4v v v ol output low voltage i o = 1.8ma ltc1440 gnd + 0.4v v ltc1441/ltc1442 v C + 0.4v v reference v ref reference voltage no load ltc1440/ltc1442 0 c t a 70 c 1.170 1.194 v C40 c t a 85 c 1.164 1.200 v ltc1440 (msop, dfn) 1.164 1.200 v i source reference output source current ? v ref 1mv (ltc1442) 100 a i sink reference output sink current ? v ref 2.5mv (ltc1442) 10 20 a ? v ref reference source current 0 i source 2ma (ltc1440) 0.8 5 mv reference sink current 0 i sink 10 a (ltc1440) 0.5 1.5 mv 5mv noise voltage noise 100hz to 100khz 100 v rms
4 ltc1440/ltc1441/ltc1442 144012fd electrical characteristics the denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25 c. v + = 3v and v = gnd = 0v unless otherwise noted. note 1: 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. symbol parameter conditions min typ max units power supply v + supply voltage range 211v i cc supply current in + = in C + 80mv ltc1440 0 c t a 70 c 2 3.9 a hyst = ref (ltc1440/ltc1442) C40 c t a 85 c 4.3 a ltc1441 3.5 5.7 a ltc1442 3.5 5.7 a comparator v os comparator input offset voltage v cm = 1.5v 3 10 mv i in input leakage current (in + , in C )v in + = v in C = 1.5v 0.01 1na input leakage current (hyst) 0.02 1na v cm comparator input common v C v + C 1.3v v mode range cmrr common mode rejection ratio v C to v + C 1.3v 0.1 1 mv/v psrr power supply rejection ratio v + = 2v to 11v (ltc1441) 0.1 1 mv/v v + = 2.5v to 11v (ltc1440/ltc1442) 0.1 1 mv/v noise voltage noise 100hz to 100khz 100 v rms v hyst hysteresis input voltage range ltc1440/ltc1442 ref C 50mv ref v t pd propagation delay c out = 100pf overdrive = 10mv 14 s overdrive = 100mv 5 s v oh output high voltage i o = C 8ma v + C 0.4v v comparator v ol output low voltage i o = 0.8ma ltc1440 gnd + 0.4v v ltc1441/ltc1442 v C + 0.4v v reference v ref reference voltage no load ltc1440/ltc1442 0 c t a 70 c 1.170 1.182 1.194 v C40 c t a 85 c 1.164 1.200 v ltc1440 (msop, dfn) 1.164 1.200 v i source reference output source current ? v ref 1mv (ltc1442) 60 120 a i sink reference output sink current ? v ref 2.5mv (ltc1442) 10 20 a ? v ref reference source current 0 i source 1ma (ltc1440) 0.8 5.5 mv reference sink current 0 i sink 10 a (ltc1440) 0.5 1.5 mv 5mv noise voltage noise 100hz to 100khz 100 v rms
5 ltc1440/ltc1441/ltc1442 144012fd response time ( s) C1 input voltage (mv) output voltage (v) 0 0 1 6 14 18 5 1440/1/2 g02 100 210 4 12 16 08 2 3 4 100mv 10mv 50mv 20mv t a = 25 c response time ( s) C1 input voltage (mv) output voltage (v) 100 0 1 6 4 5 1440/1/2 g01 0 2 010 8 2 3 4 100mv 10mv 50mv 20mv t a = 25 c supply voltage (v) 0 source current (ma) 3 5 1440/1/2 g04 12 4 160 140 120 100 80 60 40 20 0 out connected to v C = gnd = 0v typical perfor a ce characteristics uw comparator response time vs input overdrive comparator short-circuit sink current vs supply voltage supply voltage (v) 0 sink current (ma) 200 180 160 140 120 100 80 60 40 20 0 8 1440/1/2 g03 2 13579 4 6 10 out connected to v + t a = 25 c comparator short-circuit source current vs supply voltage comparator response time vs input overdrive
6 ltc1440/ltc1441/ltc1442 144012fd typical perfor a ce characteristics uw comparator response time vs load capacitance with 100mv input overdrive comparator response time at low supply voltage comparator output voltage high vs load current load capacitance (nf) 0 response time ( s) 12 10 8 6 4 2 80 1440/1/2 g05 20 40 60 100 t phl t plh supply voltage (v) 1.0 response time ( s) 10000 1000 100 10 1 1.2 1.4 1.6 1.1 1.3 1.5 1440/1/2 g06 20mv overdrive 100mv overdrive load current (ma) 0 1 output voltage high (v) 2 3 4 5 10 20 30 40 1440/1/2 g07 50 60 v + = 5v v + = 3v v + = 2v t a = 25 c
7 ltc1440/ltc1441/ltc1442 144012fd typical perfor a ce characteristics uw comparator output voltage low vs load current ltc1440/ltc1442 hysteresis control v ref C v hyst (mv) 0 positive-to-negative input voltage (mv) 30 50 1440/1/2 g09 10 20 40 80 60 40 20 0 C20 C40 C60 C80 output high output low temperature ( c) C60 supply current ( a) 6 5 4 3 2 1 100 1440/1/2 g10 C20 C40 20 40 80 120 0 60 140 v + = 5v v C = C5v v + = 5v v C = gnd = 0v v + = 3v v C = gnd = 0v ltc1440 supply current vs temperature load current (ma) 0 output voltage low (v) 1.5 2.0 2.5 30 50 80 1440/1/2 g08 1.0 0.5 0 10 20 40 60 70 v + = 2v v + = 3v v + = 5v t a = 25 c
8 ltc1440/ltc1441/ltc1442 144012fd output load current (ma) 0 1.190 1.185 1.180 1.175 1.170 1.165 1.160 1.155 1.5 2.5 1440/1/2 g11 0.5 1.0 2.0 3.0 3.5 reference output voltage (v) v cc = 5v source reference output voltage vs output load current reference voltage vs temperature temperature ( c) C60 reference voltage (v) 1.186 1.184 1.182 1.180 1.178 1.176 1.174 1.172 1.170 100 1440/1/2 g13 C20 C40 20 40 80 120 0 60 140 output load current ( a) 0 reference output voltage (v) 1.200 1.195 1.190 1.185 1.180 1.175 1.170 5 10 15 20 1440/1/2 g12 25 30 v cc = 5v sink v cc = 2v reference output voltage vs output load current (sink) typical perfor a ce characteristics uw
9 ltc1440/ltc1441/ltc1442 144012fd pi n fu n ctio n s uuu v C v + out a ltc1441 1 2 3 4 8 7 6 5 in a + in a C in b + in b C out b 1440/1/2 pd C + a C + b v C v C v + out a ltc1442 1 2 3 4 8 7 6 5 in a + in b C ref hyst out b 1 2 3 4 8 7 6 5 in + in C hyst ref v + out C + v C gnd ltc1440 C + C + a b ltc1440 gnd (pin 1): ground. connect to v C 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 com- mon mode range from v C to v + C1.3v. input current typically 10pa at 25 c. in (pin 4): inverting comparator input. input common mode range from v C to v + C1.3v. input current typically 10pa at 25 c. hyst (pin 5): hysteresis input. connect to ref if not used. input voltage range is from v ref to v ref C 50mv. ref (pin 6): reference output. 1.182v with respect to v C . can source up to 200 a and sink 15 a at 25 c. drive 0.01 f bypass capacitor without oscillation. v + (pin 7): positive supply. 2v to 11v. 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 C 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 C to v + C1.3v. input current typically 10pa at 25 c. in a (pin 4): inverting input of comparator a. input common mode range from v C to v + C1.3v. input current typically 10pa at 25 c. in b (pin 5): inverting input of comparator b. input common mode range from v C to v + C1.3v. input current typically 10pa at 25 c. in b + (pin 6): noninverting input of comparator b. input common mode range from v C to v + C1.3v. 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 C to v + . output can source up to 40ma and sink 5ma. ltc1442 out a (pin 1): comparator a cmos output. swings from v C 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 C to v + C1.3v. input current typically 10pa at 25 c. in b (pin 4): inverting input of comparator b. input common mode range from v C to v + C1.3v. input current typically 10pa at 25 c. hyst (pin 5): hysteresis input. connect to ref if not used. input voltage range is from v ref to v ref C 50mv. ref (pin 6): reference output. 1.182v with respect to v C . can source up to 200 a and sink 15 a at 25 c. drive 0.01 f bypass capacitor without oscillation. v + (pin 7): positive supply. 2v to 11v. out b (pin 8): comparator b cmos output. swings from v C to v + . output can source up to 40ma and sink 5ma.
10 ltc1440/ltc1441/ltc1442 144012fd 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 0.01 f capacitor without oscil- lation. the comparators cmos outputs can source up to 40ma and the supply current glitches, that normally occur when switching logic states, have been eliminated. power supplies 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 C to gnd on the ltc1440 will allow single supply operation. if the comparator out- put is required to source more than 1ma, or the supply source impedance is high, v + should be bypassed with a 0.1 f capacitor. comparator inputs the comparator inputs can swing from the negative sup- ply v C to within 1.3v max of the positive supply v + . the inputs can be forced 300mv below v C or above v + without damage and the typical input leakage current is only 10pa. comparator outputs 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 C 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. voltage reference the internal bandgap reference has a voltage of 1.182v referenced to v C . the reference accuracy is 1.5% from C40 c to 85 c. it can source up to 200 a and sink up to 20 a with a 5v supply. the reference can drive a bypass capacitor of up to 0.01 f without oscillation and by inserting a series resistor, capacitance values up to 100 f can be used (figure 1). 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 com- parators by preventing glitches on v + or reference load transients from disturbing the reference output voltage. 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 doesnt trip. applicatio n s i n for m atio n wu u u ltc144x v C ref r1 c1 reference output 1440/1/2 f01 figure 1. damping the reference output capacitor value ( f) 0.001 0.1 resistor value (k ? ) 10 1000 0.01 0.1 10 1 1440/1/2 f02 1 100 figure 2. damping resistance vs bypass capacitor value
11 ltc1440/ltc1441/ltc1442 144012fd applicatio n s i n for m atio n wu u u v + r1 430 ? r2 10k c1 1 f 5v to 8v out v C 21 7 8 gnd ltc1440 1440/1/2 f03a in + in C hyst ref 3 4 5 6 r3 2.4m C + figure 3a. reference transient response test circuit 2ms/div 1440/1/2 f03b 8v v + 5v v ref out 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 C (figure 4). the difference between the upper and lower threshold voltages, or hysteresis voltage band (v hb ), 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 de- creases. 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 2mv/div up to 15%. if hysteresis is not wanted, the hyst pin should be shorted to ref. acceptable values for i ref range from 0.1 a to 5 a. if 2.4m is chosen for r2, then the value of r1 is equal to the value of v hb . figure 5. glitch-free level detector with hysteresis v + r5 430 ? 5% r3 15k 1% c1 1 f out v C 21 7 5v v in 8 gnd ltc1440 1440/1/2 f05 in + in C hyst ref 3 4 5 6 C + r2 3.4m 1% r1 1.18m 1% r4 2.4m 1% 6 r2 hyst v C ref 5 r1 1440/1/2 f04 ltc1440 2 i ref r1 = v hb (2)(i ref ) r2 = i ref 1.182v C ( ) v hb 2 figure 4. programmable hysteresis 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 v in 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: 1. choose the v in voltage trip level, in this example 4.65v. figure 3b. reference and comparator output transient response
12 ltc1440/ltc1441/ltc1442 144012fd applicatio n s i n for m atio n wu u u 2. calculate the required resistive divider ratio. ratio = v ref /v in ratio = 1.182v/4.65v = 0.254 3. choose the required hysteresis voltage band at the input v hbin , in this example 60mv. calculate the hyster- esis voltage band referred to the comparator input v hb . v hb = (v hbin )(ratio) v hb = (60mv)(0.254) v hb = 15.24mv 4. choose the values for r3 and r4 to set the hysteresis. r4 = 2.4m r3(k ? ) = v hb = 15k 5. choose the values for r1 and r2 to set the trip point. r v i v a m rr v v v ref bias in ref hb 1 1 182 1 118 21 2 1 == = = + ? ? ? ? ? ? ? ? ? ? ? ? ? . . rm v v mv rm 2118 465 1 182 15 2 1 2340 = + ? ? ? ? ? ? ? ? ? ? ? ? ? = . . . . low voltage operation it is important to note that the voltage references internal to the ltc1440 and ltc1442 can exceed the common mode range of the comparators at low supply voltages. the input common mode range of the ltc1440/ltc1441/ ltc1442 comparators is guaranteed to extend up to (v + - 1.3v). therefore, if one of the comparator inputs is at the 1.182v reference voltage, the minimum supply voltage is 2.5v for a valid output reading. the guaranteed minimum operating voltage for the ltc1440/ltc1441/ltc1442 is 2v (or 1v). however, both the reference and comparator(s) will function with a supply voltage as low as 1.5v, but performance will degrade as the voltage goes below 2v. the voltage refer- ence 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 1.1v below the positive supply.
13 ltc1440/ltc1441/ltc1442 144012fd 10-bit 30 a a/d converter C + 5v 5v 2n3809 1n914 32.768khz vn2222ll 10pf 100k e in 0v to 3v 365k* 470k 1m 10m 150k 0.033 f polystyrene c1 1/2 ltc1441 lt ? 1034 1.2v q d clk 74c74 conv command data out status 1440/1/2 ta03 q 1.2m C + c2 1/2 ltc1441 74c00 74c00 74c00 74c00 *trw-irc mrtC5/+120ppm/ c typical applicatio n s u 32.768khz ?atch crystal?oscillator +v 32.768khz 10pf 470k 1m out 1440/1/2 ta05 1.2m C + 1/2 ltc1441
14 ltc1440/ltc1441/ltc1442 144012fd 3.00 0.10 (4 sides) note: 1. drawing to be made a jedec package outline m0-229 variation of (weed-1) 2. drawing not to scale 3. all dimensions are in millimeters 4. dimensions of exposed pad on bottom of package do not include mold flash. mold flash, if present, shall not exceed 0.15mm on any side 5. exposed pad shall be solder plated 6. shaded area is only a reference for pin 1 location on top and bottom of package 0.38 0.10 bottom viewexposed pad 1.65 0.10 (2 sides) 0.75 0.05 r = 0.115 typ 2.38 0.10 (2 sides) 1 4 8 5 pin 1 top mark (note 6) 0.200 ref 0.00 C 0.05 (dd8) dfn 1203 0.25 0.05 2.38 0.05 (2 sides) recommended solder pad pitch and dimensions 1.65 0.05 (2 sides) 2.15 0.05 0.50 bsc 0.675 0.05 3.5 0.05 package outline 0.25 0.05 0.50 bsc msop (ms8) 0204 0.53 0.152 (.021 .006) seating plane note: 1. dimensions in millimeter/(inch) 2. drawing not to scale 3. dimension does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.152mm (.006") per side 4. dimension does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.152mm (.006") per side 5. lead coplanarity (bottom of leads after forming) shall be 0.102mm (.004") max 0.18 (.007) 0.254 (.010) 1.10 (.043) max 0.22 C 0.38 (.009 C .015) typ 0.127 0.076 (.005 .003) 0.86 (.034) ref 0.65 (.0256) bsc 0 C 6 typ detail a detail a gauge plane 12 3 4 4.90 0.152 (.193 .006) 8 7 6 5 3.00 0.102 (.118 .004) (note 3) 3.00 0.102 (.118 .004) (note 4) 0.52 (.0205) ref 5.23 (.206) min 3.20 C 3.45 (.126 C .136) 0.889 0.127 (.035 .005) recommended solder pad layout 0.42 0.038 (.0165 .0015) typ 0.65 (.0256) bsc dd package 8-lead plastic dfn (3mm 3mm) (reference ltc dwg # 05-08-1698) ms8 package 8-lead plastic msop (reference ltc dwg # 05-08-1660) u package descriptio
15 ltc1440/ltc1441/ltc1442 144012fd 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. package descriptio n u n8 package 8-lead pdip (narrow 0.300) (ltc dwg # 05-08-1510) s8 package 8-lead plastic small outline (narrow 0.150) (ltc dwg # 05-08-1610) n8 1002 .065 (1.651) typ .045 C .065 (1.143 C 1.651) .130 .005 (3.302 0.127) .020 (0.508) min .018 .003 (0.457 0.076) .120 (3.048) min 12 3 4 87 6 5 .255 .015* (6.477 0.381) .400* (10.160) max .008 C .015 (0.203 C 0.381) .300 C .325 (7.620 C 8.255) .325 +.035 C.015 +0.889 C0.381 8.255 () note: 1. dimensions are inches millimeters *these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .010 inch (0.254mm) .100 (2.54) bsc .016 C .050 (0.406 C 1.270) .010 C .020 (0.254 C 0.508) 45 0 C 8 typ .008 C .010 (0.203 C 0.254) so8 0303 .053 C .069 (1.346 C 1.752) .014 C .019 (0.355 C 0.483) typ .004 C .010 (0.101 C 0.254) .050 (1.270) bsc 1 2 3 4 .150 C .157 (3.810 C 3.988) note 3 8 7 6 5 .189 C .197 (4.801 C 5.004) note 3 .228 C .244 (5.791 C 6.197) .245 min .160 .005 recommended solder pad layout .045 .005 .050 bsc .030 .005 typ inches (millimeters) note: 1. dimensions in 2. drawing not to scale 3. these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .006" (0.15mm)
16 ltc1440/ltc1441/ltc1442 144012fd linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax: (408) 434-0507 www.linear.com lt 0806 rev d ? printed in usa ? linear technology corporation 1996 10khz v/f converter typical applicatio n u related parts part number description comments ltc1443 1.182v reference with micropower quad comparators 1% accuracy, 8.5 a maximum current, ref output drives 0.01 f ltc1444/ltc1445 1.2v reference with quad comparator 1% accuracy, 8.5 a maximum current, ref output drives 0.01 f with adjustable hysteresis ltc1540 1.182v reference with nanopower comparator dfn package 0.3 a quiescent current (typical), reference with adjustable hysteresis drives 0.01 f ltc1541 1.2v reference with micropower amplifier and comparator dfn package 1.25% accuracy, rail-to-rail out, low offset amplifie r ltc1842/ltc1843 1.82v reference with dual comparators 1% accuracy, open-drain out, reference drives 0.01 f with adjustable hysteresis ltc1998 1.2 reference with comparator with adjustable thesholds li-ion low battery monitor, sot23, 1% accuracy lt6700-1 0.4 reference with low voltage dual comparators sot23, 1.4v to 18.5v supply range, 2% over temperature lt6700-2/lt6700-3 C + 100pf** 50pf 2.2 f 1.2m* 10khz trim 200k 10m 100k 2k* lm334 +v 6.2v to 12v lt1034-1.2 lt1034-1.2 2.7m c1 1/2 ltc1441 f out 0khz to 10khz 74c14 1440/1/2 ta04 0.01 f 0.1 f input 0v to 5v q5 q6 15k 2m typ 100hz trim C + c2 1/2 ltc1441 q1 q8 q2 q3 q4 0.47 f q7 = hp5082-2810 = 1n4148 = 2n2222 = 1% metal film = polystyrene * ** + +

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