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tsm971/72/73/82/84 page 1 ? 2012 touchstone semiconductor, inc. all rights reserved. features ? alternate source for: max971/max972/max973/max982/max984 ? ultra - low quiescent current over temp erature tsm97 1 single+reference: 4a (max) tsm972: dual comparator only: 4a (max) tsm97 3 /tsm982 dual+reference: 6a (max) tsm98 4 quad+reference: 8.5a (max) ? single or dual power supplies: single : +2.5v to +11v dual : 1.25v to 5.5v ? input voltage range includes negative supply ? 12s propagati on delay at 10mv overdrive ? open - drain output stage s for wired - or applications ? internal 1.182v 1% reference : tsm971/tsm97 3 ? internal 1.182v 2 % reference : tsm982/tsm984 ? adjustable hysteresis : tsm9 7 1/tsm9 7 3 /tsm982 ? separate output gnd pin: tsm971/tsm984 applications threshold detectors window comparator level translators oscillator circuits battery - powered systems description the tsm 9 7 1 /972/973/982/984 family of single/ dual / quad, low - voltage , micropower analog comparators is electrically and form - factor identical to the max971/972/973/982/984 family of analog comparators. ideal for 3v or 5v single - supply applications, th is comparator family can operate from single +2.5v to +11v supplies or from 1.25v to 5 .5 v dual supplies. the single tsm971 and the dual tsm972 draw less than 4a (max) supply current over temperature . the tsm973/tsm982 duals and the quad tsm984 draw less than 3 a per comparator over temperature. all comparators in this family exhibit an input voltage range from the negative supply rail to within 1.3v of the positive supply. wired - or applications are enabled as the comparators output stages are open - drain. a 1.182v reference is inter nal to the tsm971/tsm973 ( 1% ) and the tsm982/tsm984 (2 % ). without complicated feedback configurations and only requiring two additional resistors, adding external hysteresis is available on the tsm971, tsm973, and the tsm982. ultra - low - power, open - drain single/dual - supply comparators typical application circuit a 5v, low - parts - count window detector part internal reference comparators per package internal hysteresis tsm97 1 yes, 1% 1 yes tsm97 2 no 2 no tsm97 3 yes, 1% 2 yes tsm982 yes, 2 % 2 yes tsm98 4 yes, 2 % 4 no part temperature range package tsm97 1 c 0oc to 70oc 8 - pin msop/soic tsm97 1 e - 40oc to 85oc tsm97 2 c 0oc to 70oc 8 - pin msop/soic tsm97 2 e - 40oc to 85oc tsm97 3 c 0oc to 70oc 8 - pin msop/soic tsm97 3 e - 40oc to 85oc tsm982c 0oc to 70oc 8 - pin msop/soic tsm982e - 40oc to 85oc tsm98 4 c 0oc to 70oc 16 - pin soic tsm98 4 e - 40oc to 85oc t he touchstone semicondu c tor logo is a registered trademark of touchstone semiconductor, incorporated.
tsm971/72/73/82/84 page 2 tsm971_73/tsm982/tsm984ds r1p0 rtfds absolute maximum ratings supply voltage ( v+ to v - , v+ to gnd, gnd to v - )... ... - 0.3v, +12v voltage inputs (in+, in - ) ... .......................... .......... . ..... . ( v+ + 0.3v) to (v - - 0.3v) hyst.(ref + 5 v) to (v - - 0.3v) output voltage ref ............................ ................... . ..... (v+ + 0.3v) to (v - - 0.3v) out ( tsm971, tsm98 4 )......... ........( v+ + 0.3v ) to (gnd - 0.3v) out ( tsm972/73, tsm982/84 ) .... ... ...( v+ + 0.3v ) to (v - - 0.3v) input current (in+, in - , hyst ). ............. . ..... ....... ....... . ...........20ma output current continuous power dissipation (t a = +70c) 8 - pin msop (derate 4.1mw/c above +70c) .................330mw 8 - pin soic (derate 5.88mw/c above +70c)..................471mw 16 - pin soic (8.7mw/c above +70c) ............................696mw operating temperature range tsm97xc.......................... .... ....................................0c to +70 c tsm98xe.......................... .... ................................ . - 40c to +85c storage temperature range ........................ ... .. . ... - 65c to +150c lead tempe rature (soldering, 10s) ..................... ..... ....... .. ...+300c ref.20ma out.50ma output short - circuit duration (v+ 5.5v) ...... ........ ..... continuous electrical and thermal s tresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only and functional operation of the device at these or any other condition beyond those indicated in the operational sections of the specifications is not implied. exposure to any absolute maximum rating conditions for extended periods may affect device reliab ility and lifetime . package/ordering information order number part marking carrier quantity order number part marking carrier quantity tsm971 cua+ ta az tube 50 tsm971 csa+ ts9 7 1 tube 97 tsm971 csa+t tape & reel 2500 tsm971 cua+t tape & reel 2500 tsm971 esa+ ts97 1e tube 97 tsm971 esa+t tape & reel 2500
tsm971/72/73/82/84 tsm971_73/tsm982/tsm984ds r1p0 page 3 rtfds package/ordering information order number part marking carrier quantity order number part marking carrier quantity tsm972 cua+ tab j tube 50 tsm972 csa+ ts97 2 tube 97 tsm972 csa+t tape & reel 2500 tsm972 cua+t tape & reel 2500 tsm972 esa+ ts97 2e tube 97 tsm972 esa+t tape & reel 2500 order number part marking carrier quantity order number part marking carrier quantity tsm973 cua+ tab e tube 50 tsm973 csa+ ts9 73 tube 97 tsm973 csa+t tape & reel 2500 tsm973 cua+t tape & reel 2500 tsm973 esa+ ts9 73e tube 97 tsm973 esa+t tape & reel 2500
tsm971/72/73/82/84 page 4 tsm971_73/tsm982/tsm984ds r1p0 rtfds package/ordering information order number part marking carrier quantity order number part marking carrier quantity tsm982 cua+ tab k tube 50 tsm982 csa+ ts9 82 tube 97 tsm982 csa+t tape & reel 2500 tsm982 cua+t tape & reel 2500 tsm982 esa+ ts9 82e tube 97 tsm982 esa+t tape & reel 2500 order number part marking carrier quantity order number part marking carrier quantity tsm984 cse+ ts98 4 tube 48 tsm984 ese+ ts98 4e tube 48 tsm984 cse+t tape & reel 2500 tsm984 ese+t tape & reel 2500 lead - free program: touchstone semico nductor supplies only lead - free packaging. consult touchstone semiconductor for products specified with wider operating temperature ranges.
tsm971/72/73/82/84 tsm971_73/tsm982/tsm984ds r1p0 page 5 rtfds electrical characteristics C 5v operation v+ = 5v, v - = gnd = 0v; t a = - 40oc to +85oc, unless otherwise noted. typical values are at t a = +25oc. see note 1. parameter conditions min typ tsm units power requirements supply voltage range see note 2 2.5 11 v output voltage range 0 11 v supply current in+ = in - + 100mv tsm971; hyst = ref t a = +25c 2.5 3.2 a t a = - 40c to +85c 4 tsm972 t a = +25c 2.5 3.2 t a = - 40c to +85c 4 tsm973 tsm 982; hyst = ref t a = +25c 3.1 4.5 t a = - 40c to +85c 6 tsm984 t a = +25c 5.5 6.5 t a = - 40c to +85c 8.5 comparator input offset voltage v cm = 2.5v 10 mv input leakage current (in - , in+) in+ = in - = 2.5v c/e temp ranges 0.01 5 na input leakage current (at hyst pin) tsm971, tsm973, tsm982 0.02 na input common - mode voltage range v - v+ C 1.3v v common - mode rejection ratio v - to (v+ C 1.3v) 0.1 1.0 mv/v power - supply rejection ratio v+ = 2.5v to 11v 0.1 1.0 mv/v voltage noise 100hz to 100khz 20 v rms hysteresis input voltage range tsm971, tsm973, tsm982 ref - 0.05v ref v response time (high - to - low transition) t a = +25c; 100pf load; 1m? pullup to v+ overdrive = 10 mv 12 s overdrive = 100 mv 4 response time (low - to - high transition) t a = +25c; 100pf load; 1m? pullup to v+ . see note 3 300 s output low voltage tsm9x2, tsm973 i out = 1.8ma v - + 0.4 v tsm971, tsm984 i out = 1.8ma gnd + 0.4 output leakage current v out = 11v 100 na reference reference voltage tsm971, tsm973 t a = 0c to +70 c , 1% 1.170 1.182 1.194 v t a = - 40c to +85c , 2% 1.158 1.206 v tsm982, tsm984 t a = 0c to +70 c , 2% 1.158 1.182 1.206 v t a = - 40c to +85c , 3% 1.147 1.217 v source current t a = +25c 15 25 a t a = - 40c to +85c 6 sink current t a = +25c 8 15 a t a = - 40c to +85c 4 voltage noise 100hz to 100khz 100 v rms
tsm971/72/73/82/84 page 6 tsm971_73/tsm982/tsm984ds r1p0 rtfds electrical characteristics C 3v operation v+ = 3v, v - = gnd = 0v ; t a = - 40oc to +85oc, unless otherwise noted. typical values are at t a = +25oc. see note 1. parameter conditions min typ tsm units power requirements supply current in+ = in - + 100mv tsm971; hyst = ref t a = +25c 2.4 3.0 a t a = - 40c to +85c 3.8 tsm972 t a = +25c 2.4 3.0 t a = - 40c to +85c 3.8 tsm973 tsm982; hyst = ref t a = +25c 3.4 4.3 t a = - 40c to +85c 5.8 tsm984 t a = +25c 5.2 6.2 t a = - 40c to +85c 8.0 comparator input offset voltage v cm = 1 .5v 10 mv input leakage current (in - , in+) in+ = in - = 1 .5v c/e temp ranges 0.01 5 na input leakage current (at hyst pin) tsm971, tsm973, tsm982 0.02 na input common - mode voltage range v - v+ C 1.3v v common - mode rejection ratio v - to (v+ C 1.3v) 0.2 1.0 mv/v power - supply rejection ratio v+ = 2.5v to 11v 0.1 1.0 mv/v voltage noise 100hz to 100khz 20 v rms hysteresis input voltage range tsm971, tsm973, tsm982 ref - 0.05v ref v response time (high - to - low transition) t a = +25c; 100pf load; 1m? pullup to v+ overdrive = 10 mv 12 s overdrive = 100 mv 4 response time (low - to - high transition) t a = +25c; 100pf load; 1m? pullup to v+ . see note 3 300 s output low voltage tsm9x2, tsm973 i out = 0 .8ma v - + 0.4 v tsm971, tsm984 i out = 0. 8ma gnd + 0.4 output leakage current v out = 11v 100 na reference reference voltage tsm971, tsm973 t a = 0c to +70 c , 1% 1.170 1.182 1.194 v t a = - 40c to +85c , 2% 1.158 1.206 v tsm982, tsm984 t a = 0c to +70 c , 2% 1.158 1.182 1.206 v t a = - 40c to +85c , 3% 1.147 1.217 v source current t a = +25c 15 25 a t a = - 40c to +85c 6 sink current t a = +25c 8 15 a t a = - 40c to +85c 4 voltage noise 100hz to 100khz 100 v rms note 1 : all specifications are 100% tested at t a = +25c. specification limits over temperature (t a = t min to t max ) are guaranteed by device characterization, not production tested. note 2: the tsm934 comparator operates below 2.5v . refer to the low - voltage operation: v+ = 1.5 v (tsm98 4 only) section. note 3 : low - to - high response time is due to a 1m? pullup resistor and a 100pf capacitive load, based after three time constants . a smaller rc combination results in a faster response time.
tsm971/72/73/82/84 tsm971_73/tsm982/tsm984ds r1p0 page 7 rtfds typical performance characteristics v + = 5v; v - = gnd ; t a = +25c , unless otherwise noted. load current - ma v ol - v 4 8 1 0 output voltage low vs load current 0 12 1.5 2 0.5 16 temperature - oc reference voltage - v reference voltage vs temperature v+ = 3v v+ = 5v temperature - oc supply current - a 2.5 1.5 tsm971 supply current vs temperature 3 3.5 2 temperature - oc supply current - a tsm972 supply current vs temperature in+ = in - + 100mv 20 2.5 - 15 10 - 40 35 60 85 1.16 1.14 1.19 1.17 1.18 1.15 1.21 1.20 1.22 - 15 10 - 40 35 60 85 4 v+ = 5v, v - = - 5v v+ = 5v, v - = 0v v+ = 3v, v - = 0v - 15 10 - 40 35 60 85 in+ = in - + 100mv v+ = 10v, v - = 0v v+ = 5v, v - = 0v v+ = 3v, v - = 0v 24 28 4.5 2.5 1.5 3 3.5 2 4 4.5 load current - a reference voltage - v 5 10 1.165 1.155 1.180 reference output voltage vs output load current 0 15 1.170 1.175 1.160 20 sink 25 30 1.190 1.185 source v+ = 3v or 5v temperature - oc supply current - a tsm973/982 supply current vs temperature - 15 10 - 40 35 60 85 3 2 3.5 4 2.5 4.5 5 v+ = 5v, v - = 0v v+ = 3v, v - = 0v
tsm971/72/73/82/84 page 8 tsm971_73/tsm982/tsm984ds r1p0 rtfds typical performance characteristics v + = 5v; v - = gnd ; t a = +25c , unless otherwise noted. single - supply voltage - v supply current - a 2 1 tsm984 supply current vs low supply voltages 1.5 2.5 10 0.1 v ref - v hyst - mv in+ - in - - mv - 40 - 80 tsm971/973/982 hysteresis control - 20 0 - 60 10 20 0 30 40 temperature - oc supply current - a - 15 10 tsm984 supply current vs temperature - 40 35 60 85 output high load capacitance - nf response time - s response time vs load capacitance 20 40 0 60 80 v - = 0v 5 3 6 7 4 8 9 10 in+ = in - + 100mv v+ = 5v, v - = - 5v v+ = 5v, v - = 0v v+ = 3v, v - = 0v 50 60 20 80 40 output low no change 100 6 8 10 12 14 16 18 v ohl in+ input voltage - mv output voltage - v - 0.3 - 0.2 1 0 tsm971/972/984 transfer function - 0.4 0 3 4 2 0.1 0.2 0.3 5 - 0.1 0.4 response time for various input overdrives (high - to - low) output voltage - v input voltage - m v 10mv 20mv 50mv 100mv 0 0 1 2 100 5 3 4 0 2 - 2 4 6 8 10 12 14 16 18 response time - s
tsm971/72/73/82/84 tsm971_73/tsm982/tsm984ds r1p0 page 9 rtfds single - supply voltage - v response time - s 1.5 2 10 response time at low supply voltages (low - to - high) 2.5 100 1 single - supply voltage - v current - ma 10 tsm984 sink current at low supply voltages 1 20mv overdrive 100mv overdrive 1.5 2 2.5 sink current at v out = 0.4v typical performance characteristics v + = 5v; v - = gnd ; t a = +25c , unless otherwise noted. sink current - ma 22 16 short - circuit sink current vs supply voltage 18 4 6 2 gnd connected to v - out connected to v+ 8 10 20 24 r pullup = 10k
tsm971/72/73/82/84 page 10 tsm971_73/tsm982/tsm984ds r1p0 rtfds pin functions pin name function tsm971 tsm972 tsm973 tsm982 1 gnd ground. connect to v - for single - supply operation. 2 2 2 2 v - negative supply. connect to ground for single - supply operation (tsm971 ). 3 in+ comparator noninverting input 4 in - comparator inverting input 5 5 5 hyst hysteresis input. connect to ref if not used. input voltage range is from v ref to (v ref - 50mv). 6 6 6 ref reference output. 1.182v with respect to v - . 7 7 7 7 v+ positive supply voltage 8 out comparator output. sinks current to gnd. 1 1 1 outa comparator a output. sinks current to v - . 3 3 3 ina+ comparator a noninverting input 4 ina - comparator a i nverting input 5 4 inb - comparator b i nverting input 6 4 inb+ comparator b noninverting input 8 8 8 outb comparator b output. sinks current to v - . pin name function tsm98 4 1 outb comparator b output. sinks current to gnd. 2 outa comparator a output. sinks current to gnd. 3 v+ positive supply voltage 4 ina - comparator a inverting input 5 ina+ comparator a noninverting input 6 inb - comparator b inverting input 7 inb+ comparator b noninverting input 8 ref 1.182v reference output with respect to v - . 9 v - negative supply voltage. connect to ground for single - supply operation. 10 inc - comparator c inverting input 11 inc+ comparator c noninverting input 12 ind - comparator d inverting input 13 ind+ comparator d noninverting input 14 gnd ground. connect to v - for single - supply operation. 15 outd comparator d output. sinks current to gnd. 16 outc comparator c output. sinks current to gnd.
tsm971/72/73/82/84 tsm971_73/tsm982/tsm984ds r1p0 page 11 rtfds block diagrams
tsm971/72/73/82/84 page 12 tsm971_73/tsm982/tsm984ds r1p0 rtfds theory of operation the tsm 9 7 1 /972/973/982/984 family of single/ dual / quad, low - voltage , micropower analog comparators provide excell ent flexibility and performance while sourcing continuously up to 40ma of current. the tsm97 1, tsm97 3 , tsm982, and the tsm98 4 provide an on - board 1.182v reference voltage. to minimize current consumption while providing flexibility, the tsm971, tsm973, and the tsm982 have an on - board hy st pin in order to add additional hysteresis. power - supply and input signal ranges the tsm 9 7 1 /972/973/982/984 can operate from a single supply voltage range of +2.5v to +11v, provide a wide common mode input voltage range of v - to v+ - 1.3v, and accept input signals ranging from v - to v+ - 1v. the inputs can accept an input as much as 300mv above the below the powe r supply rails without dam age to the part. while the tsm971 and the tsm98 4 are able to operate from a single supply voltage range, a gnd pin is available that allows for a dual supply operation with a range of 1.25v to 5.5v . if a single supply operation is desired, the gnd pin needs to be tied to v - . in a dual supply mode, the tsm971 and the tsm98 4 are compatible with ttl/cmos with a 5v voltage and the tsm972, tsm97 3 , and tsm982 are compatible with ttl with a single +5v supply. low - v oltage operation: v + = 1 .5 v (tsm98 4 only) due to a decrease in propagation delay and a reduction in output drive, the tsm9 71/972/973/982 cannot be used with a supply voltage much low er than 2.5v. however, the tsm98 4 can operate down to a supply voltage of 2v; furthermore , as the s upply voltage reduces, the tsm98 4 supply current drops and the performance is degraded. when the supply voltage drops to 2.2v, the reference voltage will no longer function ; however, the comparators will function down to a 1 .5 v supply voltage. furt hermore, the input voltage range is extended to just below 1v the positiv e supply rail. for applications with a sub - 2.5v power supply, it is recommended to evaluate the circuit over the entire power supply range and temperature. comparator output the tsm971 and the tsm98 4 have a gnd pin that allows the output to swing from v+ to gnd while the v - pin can be set to a voltage below gnd as long as the voltage difference between v+ and v - is within 11v. the tsm971 and the tsm984 sink current to gnd. by havi ng open - drain outputs, the tsm 9 7 1 /972/973/982/984 can be used in wire - ored and level - shifting applications. on the other hand, the tsm97 2 , tsm973, and the tsm982 do not have a gnd pin so the outputs sink current to v - . with a 100mv input overdrive, the pro pagation delay of the tsm 9 7 1 /972/973/982/984 is 4 s . voltage reference the tsm97 1 /972/973 have an on - board 1.182v reference voltage with an accuracy of 1% while the tsm982/984 have an on - board 1.182v reference voltage with an accuracy of 2% a cross a temperature range of 0 c to +70 c . the ref pin is able to source and sink 25a and 15 a of current, respectively. the ref pin is referenced to v - and it should not be bypassed. noise considerations noise can play a role in the overall performance of the tsm 9 7 1 /972/973/982/984 . despite having a large gain, if the input voltage is near or equal to the input offset voltage, the output will randomly switch high and low. as a result, the tsm 9 7 1 /972/973/98 2/984 produces a peak - to - peak noise of about 0.3mv while the reference voltage produces a peak - to - peak noise of about 1mv. furthermore, it is important to design a layout that minimizes capacitive coupling from a given output to the reference pin as crosstalk can add noise and as a result, degrade performance. applications information hysteresis as a result of circuit nois e or unintended parasitic feedback, many analog comparators often break into oscillation within their linear region of operation especially when the applied differential input voltage approaches 0v (zero volt). externally - introduced hysteresis is a well - es tablished technique to stabilizing analog comparator behavior and requires external components. as shown in figure 1 , adding comparator hysteresis creates two trip points: v thr (for the rising input voltage) and v thf (for the falling input voltage). the hy steresis band (v hb ) is defined as the voltage difference between the two trip points. when a comparators input voltages are equal,
tsm971/72/73/82/84 tsm971_73/tsm982/tsm984ds r1p0 page 13 rtfds hysteresis effectively forces one comparator input to move quickly past the other input, moving the input out of the region wh ere oscillation occurs. figure 1 illustrates the case in which an in - input is a fixed voltage and an in+ is varied. if the input signals were reversed, the figure would be the same with an inverted output. hysteresis (tsm971/973 and tsm9 82 ) hysteresis can be generated with two external resistors using positive feedback as shown in figure 2. resistor r1 is connected between ref and hyst and r2 is connected between hyst and v - . this will increase the trip point f or the rising input voltage, v thr , and decrease the trip point for the falling input voltage, v thf , by the same amount. if no hysteres is is required, connect hyst to ref. the hysteresis band, v hb , is voltage across the ref and hyst pin multiplied by a fact or of 2. the hyst pin can accept a voltage between ref and ref - 50mv, where a voltage of ref - 50mv generates the maximum voltage across r1 and thus, the maximum hysteresis and hysteresis band of 50mv and 100mv, respectively. to design the circuit for a desir ed hysteresis band, consider the equations below to acquire the values for resistors r1 and r2: r 1 = v h 2 x ref r 2 = 1 . 182 v h 2 ref where i ref is the primary source of current out of the reference pin and should be maintained within the maximum current the reference can source . this is typically in the range of 0.1 a and 4 a . it is also important to ensure that the current from reference is much larger than th e hyst pin input current. given r2 = 2.4 m , the current sourced by the reference is 0.5 a . this allows the hysteresis band and r1 to be approximated as follows: r1(k) = v hb (mv) for the tsm973 and tsm982, the hysteresis is the same for both comparators. hysteresis (tsm97 2 and tsm98 4) relative to adding hysteresis with the hy st pin as was done for the tsm971, tsm97 3, and the tsm982, the circuit in figure 3 uses positive feedback along with two external resistors to set the desired hysteresis. the circuit consumes more current and it slows down the hysteresis effect due to the high impedance on the feedback. due to the pull - up resistor on the output and its inability to source current, upper threshold variations will depend on the value of the pull - up resistor. figure 1. threshold hysteresis band figure 2. programming the hyst pin figure 3. external hysteresis
tsm971/72/73/82/84 page 14 tsm971_73/tsm982/tsm984ds r1p0 rtfds board layout and bypassing while power - s upply bypass capacitors are not typically required, it is good engineering practice to use 0.1f bypass capacitors close to the devices power su pply pins when the power supply impedance is high, t he power supply leads are long, or there is exce ssive noise on the power supply traces. to reduce str ay capacitance, it is also good engineering practice to make signal trace lengths as short as possible . also recommended are a ground plane and surface mount resistors and capacitors. typical application circuits window detector the schematic shown in figure 4 is for a 4.5v undervoltage threshold detector and a 5.5v overvoltage th reshold detector using the tsm97 3. resistor components r1, r2, and r3 can be selected based on the threshold voltage desired while resistors r4 and r5 can be selected based on the hystere sis desired. adding hysteresis to the circuit will minimize chattering on the output when the input voltage is close to the trip point. outa and outb generate the active - low undervoltage indication and active - low overvoltage indication, respectively. if bo th outa and outb signals are wired - ored , the resulting output is an active - high, power - good signal. to design the circuit, the following procedure needs to be performed: 1. as described in the section hysteresis (tsm971/973 and tsm982), determine the desired hysteresis and select resistors r4 and r5 accordingly. this circuit has 5mv of hysteresis at the input where the input voltage v in will appear larger due to the input resistor divider. 2. selecting r1. as the leakage current at the inb - pin is l ess than 1na, the current through r1 should be at least 100na to minimize offset voltage errors caused by the input leakage current. values within 100k and 1m are recommended. in this example, a 294k, 1% standard value resistor is selected for r1. 3. calculating r2 + r3. as the input voltage v in rises, the overvoltage threshold should be 5.5v. choose r2 + r3 as follows: r 2 + r 3 = r 1 x v oth v ref + v hys 1 = 294 k x 5 . 5 v 1 . 182 v + 5 mv 1 = 1 . 068 m 4. calculating r2. as the input voltage v in falls, the undervo ltage threshold should be 4.5v. choose r2 as follows: r 2 = ( r 1 + r 2 + r 3 ) x v ref v hys v uth 294 k = ( 294 k + 1 . 068 m ) x 1 . 182 v 5 mv 4 . 5 294 k = 62 . 2 k in this example, a 61.9k, 1% standard value resistor is selected for r2. 5. calculating r3. r 3 = ( r 2 + r 3 ) r 2 = 1 . 068 m C 61 . 9 k = 1 . 006 m in this example, a 1m, 1% standard value resistor is selected for r3. 6. using the equations below, verify all resistor values selected: v oth = ( v ref + v hys ) x r 1 + r 2 + r 3 r 1 = 5.474v figure 4. window detector
tsm971/72/73/82/84 tsm971_73/tsm982/tsm984ds r1p0 page 15 rtfds v oth = ( v ref v hys ) x r 1 + r 2 + r 3 ( r 1 + r 2 ) = 4 . 484 v where the hysteresis voltage is given by: v hys = v ref x r 5 r 4 battery switchover circuit diodes are typically used in applications where power to a device switches from a line - powered dc to a backup battery. however, the voltage drop and power loss across the diodes is undesired. figure 5 shows a different approach that replaces the diode with a p - channel mosfet and uses the tsm973 to control the mosfet. when the voltage from the line - powered dc drops below 4v , outa switches low , and then turns on q1 . when the battery drops below 3.6v, comp arator b generates a low - battery signal . level shifter figure 6 pr ovides a simple way to shift from bipolar 5v inputs to ttl signals by using the tsm98 4 . to protect the comparator inputs, 10k resistors are placed in series and do not have an effect on the performance of the circuit. figure 5. battery switchover circuit figure 6. level shifter: 5v input to single - ended 3.3v output
tsm971/72/73/82/84 page 16 tsm971_73/tsm982/tsm984ds r1p0 rtfds package outline draw ing 8 - pin soic package outline drawing (n.b., drawings are not to scale) 1 . 2 7 t y p 0 . 3 3 - 0 . 5 1 4 . 8 0 - 5 . 0 0 3 . 7 3 - 3 . 8 9 0 - 8 3 . 8 1 C 3 . 9 9 1 2 2 n o t e s : d o e s n o t i n c l u d e m o l d f l a s h , p r o t r u s i o n s o r g a t e b u r n s . m o l d f l a s h , p r o t r u s i o n s o r g a t e b u r r s s h a l l n o t e x c e e d 0 . 1 5 m m p e r s i d e . d o e s n o t i n c l u d e i n t e r - l e a d f l a s h o r p r o t r u s i o n s . i n t e r - l e a d f l a s h o r p r o t r u s i o n s s h a l l n o t e x c e e d 0 . 2 5 m m p e r s i d e . l e a d s p a n / s t a n d o f f h e i g h t / c o p l a n a r i t y a r e c o n s i d e r e d a s s p e c i a l c h a r a c t e r i s t i c ( s ) . c o n t r o l l i n g d i m e n s i o n s a r e i n m m . t h i s p a r t i s c o m p l i a n t w i t h j e d e c s p e c i f i c a t i o n m s - 0 1 2 l e a d s p a n / s t a n d o f f h e i g h t / c o p l a n a r i t y a r e c o n s i d e r e d a s s p e c i a l c h a r a c t e r i s t i c . 1 2 l e a d f a r m e t h i c k n e s s 0 . 1 9 C 0 . 2 5 5 . 8 0 C 6 . 2 0 0 . 1 0 C 0 . 2 5 1 . 7 5 m a x 0 . 1 0 m a x 7 ' r e f a l l s i d e 7 ' r e f a l l s i d e 0 . 7 6 m a x 0 . 6 6 m i n 0 . 4 0 6 C 0 . 8 6 3 0 . 5 4 6 r e f 0 . 4 8 m a x 0 . 2 8 m i n 4 5 ' a n g l e 0 . 2 5 5 . 6 . 1 . 3 2 C 1 . 5 2 g a u g e p l a n e 3 . 4 .
tsm971/72/73/82/84 tsm971_73/tsm982/tsm984ds r1p0 page 17 rtfds package outline draw ing 8 - pin msop package outline drawing (n.b., drawings are not to scale) 0 . 6 5 r e f 3 . 1 0 m a x 2 . 9 0 m i n 0 . 9 5 m a x 0 . 7 5 m i n 0 . 1 5 m a x 0 . 0 5 m i n s e a t i n g p l a n e 5 . 0 8 m a x 4 . 6 7 m i n 3 . 1 0 m a x 2 . 9 0 m i n 0 ' - - 6 ' d e t a i l a d e t a i l a 0 . 2 5 0 . 7 0 m a x 0 . 4 0 m i n 0 . 2 3 m a x 0 . 1 3 m i n n o t e : 1 . p a c k a g e l e n g t h d o e s n o t i n c l u d e m o l d f l a s h , p r o t r u s i o n s o r g a t e b u r r s . 2 . p a c k a g e w i d t h d o e s n o t i n c l u d e i n t e r l e a d f l a s h o r p r o t u s i o n s . 3 . c o n t r o l l i n g d i m e n s i o n i n m i l i m e t e r s . 4 . t h i s p a r t i s c o m p l i a n t w i t h j e d e c m o - 1 8 7 v a r i a t i o n s a a 5 . l e a d s p a n / s t a n d o f f h e i g h t / c o p l a n a r i t y a r e c o n s i d e r e d a s s p e c i a l c h a r a c t e r i s t i c . 1 2 8 0 . 3 8 m a x 0 . 2 8 m i n 0 . 1 0 m a x g a u g e p l a n e 1 . 1 0 m a x 0 . 2 7 r e f 0 . 1 2 7 0 . 2 3 m a x 0 . 1 3 m i n 0 . 3 8 m a x 0 . 2 8 m i n
tsm971/72/73/82/84 page 18 touchstone semiconductor, inc. tsm971_73/tsm982/tsm984ds r1p0 630 alder drive, milpitas, ca 95035 rt f ds +1 (408) 215 - 1220 ? www.touchstonesemi.com package outline draw ing 16 - pin soic package outline drawing (n.b., drawings are not to scale) information furnished by touchstone semiconduct or is believed to be accurate and reliable. however, touchstone semiconductor does not assume any responsibility for its use nor for any infringements of patents or other rights of third parties that may result f rom its use , and all information provided by touchstone semiconductor and its suppliers is provided on an as is basis, without warranty of any kind . touchstone semiconductor reserves the right to change product specifications and product descriptions at any time without any advance notice. no licens e is granted by implication or otherwise under any patent or patent rights of touchstone semiconductor. touchstone semiconductor assumes no liability for applications assistance or customer product design. customers are responsible for thei r products and a pplications using touchstone semiconductor components. to minimize the risk associated with customer products and application s, customers should provide adequate design and operating safeguards. trademarks and registered trademarks are the property of t hei r respective owners. d e t a i l a 0 . 2 5 m a x 0 . 1 9 m i n n o t e : 1 . d d o e s n o t i n c l u d e m o l d f l a s h , p r o t r u s i o n s o r g a t e b u r r s . m o l d f l a s h , p r o t r u s i o n s o r g a t e b u r r s s h a l l n o t e x c e e d 0 . 1 5 m m p e r s i d e . 2 . e d o e s n o t i n c l u d e i n t e r - l e a d f l a s h o r p r o t r u s i o n s . i n t e r - l e a d f l a s h a n d p r o t r u s i o n s o r g a t e b u r r s s h a l l n o t e x c e e d 0 . 2 5 m m p e r s i d e . 3 . c o n t r o l l i n g d i m e n s i o n s i n m i l i m e t e r s a n d a n g l e s i n d e g r e e s . 4 . t h i s p a r t i s c o m p l i a n t w i t h j e d e c s p e c i f i c a t i o n m s - 0 1 2 a b 5 . l e a d s p a n / s t a n d o f f h e i g h t / c o p l a n a r i t y a r e c o n s i d e r e d a s s p e c i a l c h a r a c t e r i s t i c . d e t a i l a 0 . 5 1 m a x 0 . 3 3 m i n 0 . 2 5 m a x o . 1 0 m i n p i n 1 i d m a r k 1 0 . 0 1 m a x 9 . 8 0 m i n ( d ) 1 . 2 7 t y p 1 . 7 5 m a x g a u g e p l a n e 0 ' - 8 ' 0 . 8 6 3 m a x 0 . 4 0 6 m i n 6 . 2 0 m a x 5 . 8 0 m i n 3 . 9 9 m a x 3 . 8 1 m i n ( e ) 0 . 2 5 0 . 4 8 m a x 0 . 2 8 m i n 4 5 ' a n g l e 7 ' t y p a l l s i d e 0 . 1 0 m a x 3 . 8 9 m a x 3 . 7 3 m i n 3 . 9 9 m a x 3 . 8 1 m i n 0 . 7 9 m a x 0 . 6 9 m i n 0 . 5 0 8 r e f

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