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tsm931 - tsm934 page 1 ? 2012 touchstone semiconductor, inc. all rights reserved. features ? alternate source for max931 - max934 ? ultra - low quiescent current over temp erature tsm93 1 single+reference: 4a (max) tsm932/tsm933 dual+reference: 6a (max) tsm934 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 ? 12 s propagation delay at 10mv overdrive ? push - pull ttl/cmos - compatible outputs ? crowbar - current - free switching ? continuous source current capability: 40ma ? internal 1.182v 2 % reference : tsm931/tsm932/tsm933 ? adjustable hysteresis : tsm931/tsm932/tsm933 applications threshold detectors window comparator level translators oscillator circuits battery - powered systems description the tsm 9 3 1 C tsm 9 3 4 family of single/ dual / quad, low - voltage , micropower analog comparators is electrically and form - factor identical to the max931 - max934 family of analog comparators. ideal for 3v or 5v single - supply applications, the tsm 9 3 1 C tsm 9 3 4 family can operate from single +2.5v to +11v supplies or from 1.25v to 5 .5 v dual supplies. the s ingle tsm931 draw s less than 4a (max) supply current over temperature . the dual tsm932/933 and the quad tsm934 each 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. in addition, the comparators push - pull output stages are ttl/cmos compatible and capable of sinking and sourcing current. the tsm931/tsm932/tsm933 each incorporates an internal 1.182v 2 % voltage reference . wit hout complicated feedback configurations and only requiring two additional resistors, adding external hysteresis via a separate pin is available on the tsm931, the tsm932, and the tsm933. ultra low - power single/dual - supply comparators with reference typical application circuit a 5v, low - parts - count window detector part internal reference comparators per package internal hysteresis tsm93 1 yes 1 yes tsm93 2 yes 2 yes tsm93 3 yes 2 yes tsm934 yes 4 no part temperature range package tsm93 1 c 0oc to 70oc 8 - pin msop/soic tsm93 1 e - 40oc to 85oc tsm93 2 c 0oc to 70oc 8 - pin msop/soic tsm93 2 e - 40oc to 85oc tsm93 3 c 0oc to 70oc 8 - pin msop/soic tsm93 3 e - 40oc to 85oc tsm934c 0oc to 70oc 16 - pin soic tsm934e - 40oc to 85oc t he touchstone semicondu c tor logo is a registered trademark of touchstone semiconductor, incorporated.
tsm931 - tsm934 page 2 tsm931_34ds 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 ( tsm931/934 ) .......... .... .............( v+ + 0.3v ) to (gnd - 0.3v) out ( tsm932/93 3 ) .......... ..... ............. ...( 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 tsm93xc.......................... .... ....................................0c to +70 c tsm93xe.......................... .... ................................ . - 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 o f the specifications is not implied. exposure to any absolute maximum rating conditions for extended periods may affect device reliability and lifetime . package/ordering information order number part marking carrier quantity order number part marking carrier quantity tsm931 cua+ ta ax tube 50 tsm931 csa+ ts93 1 tube 97 tsm931 csa+t tape & reel 2500 tsm931 cua+t tape & reel 2500 tsm931 esa+ ts93 1e tube 97 tsm931 esa+t tape & reel 2500
tsm931 - tsm934 tsm931_34ds r1p0 page 3 rtfds package/ordering information order number part marking carrier quantity order number part marking carrier quantity tsm932 cua+ ta bd tube 50 tsm932 csa+ ts93 2 tube 97 tsm932 csa+t tape & reel 2500 tsm932 cua+t tape & reel 2500 tsm932 esa+ ts93 2e tube 97 tsm932 esa+t tape & reel 2500 order number part marking carrier quantity order number part marking carrier quantity tsm933 cua+ tab b tube 50 tsm933 csa+ ts9 33 tube 97 tsm933 csa+t tape & reel 2500 tsm933 cua+t tape & reel 2500 tsm933 esa+ ts933 e tube 97 tsm933 esa+t tape & reel 2500
tsm931 - tsm934 page 4 tsm931_34ds r1p0 rtfds package/ordering information order number part marking carrier quantity order number part marking carrier quantity tsm934 cse+ ts93 4 tube 48 tsm934 ese+ ts93 4e tube 48 tsm934 cse+t tape & reel 2500 tsm934 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.
tsm931 - tsm934 tsm931_34ds 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 max units power requirements supply voltage range see note 2 2.5 11 v supply current in+ = in - + 100mv tsm931; hyst = ref t a = +25c 2.5 3.2 a a = - 40c to +85c 4 tsm932 hyst = ref t a = +25c 3.1 4.5 t a = - 40c to +85c 6 tsm933 hyst = ref t a = +25c 3.1 4.5 t a = - 40c to +85c 6 tsm934 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 t a = - 40c to +85c 0.01 5 na input leakage current (hyst) tsm931, tsm932, tsm933 0.02 na input common - mode voltage range v - v+ C C v rms hysteresis input voltage range tsm93 1, tsm932, tsm93 3 ref - 0.05v ref v response time t a = +25c; 100pf load overdrive = 10 mv 12 s a = - 40c to +85c: i out = 17ma v+ C a = - 40c to +85c: i out = 1.8ma tsm932, tsm933 v - + 0.4 v tsm931, tsm934 gnd + 0.4 v reference reference voltage t a = 0c to +70c 1.158 1.182 1.206 v t a = - 40c to +85c 1.147 1.217 v source current t a = +25c 15 25 a a = - 40c to +85c 6 sink current t a = +25c 8 15 a a = - 40c to +85c 4 voltage noise 100hz to 100khz 100 v rms
tsm931 - tsm934 page 6 tsm931_34ds 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 max units power requirements supply current in+ = in - + 100mv tsm93 1; hyst = ref t a = +25c 2.4 3 a a = - 40c to +85c 3.8 tsm93 2 hyst = ref t a = +25c 3.4 4.3 t a = - 40c to +85c 5.8 tsm93 3 hyst = ref t a = +25c 3.4 4.3 t a = - 40c to +85c 5.8 tsm93 4 t a = +25c 5.2 6.2 t a = - 40c to +85c 8 comparator input offset voltage v cm = 1 .5v 10 mv input leakage current (in - , in+) in+ = in - = 1 .5v t a = - 40c to +85c 0.01 1 na input leakage current (hyst) tsm931, tsm932, tsm93 3 0.02 na input common - mode voltage range v - v+ C C v rms hysteresis input voltage range tsm931, tsm932, tsm93 3 ref - 0.05v ref v response time t a = +25c; 100pf load overdrive = 10 mv 14 s a = - 40c to +85c : i out = 10 ma v+ C a = - 40c to +85c : i out = 0.8 ma tsm932, tsm933 v - + 0.4 v tsm931, tsm934 gnd + 0.4 v reference reference voltage t a = 0c to +70 c 1.158 1.182 1.206 v t a = - 40c to +85c 1.147 1.217 source current t a = +25c 15 25 a a = - 40c to +85c 6 sink current t a = +25c 8 15 a 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 (tsm934 only) section.
tsm931 - tsm934 tsm931_34ds 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 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 temperature - oc reference voltage - v reference voltage vs temperature load current - ma v oh - v 10 20 2 1.5 output voltage high vs load current 0 30 2.5 40 50 3 3.5 v+ = 3v v+ = 5v sink temperature - oc supply current - a 2.5 1.5 tsm931 supply current vs temperature 3 3.5 2 temperature - oc supply current - a tsm932 supply current vs temperature in+ = in - + 100mv 20 2.5 4 4.5 5 v+ = 3v v+ = 5v 25 30 1.190 1.185 source v+ = 3v or 5v - 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
tsm931 - tsm934 page 8 tsm931_34ds r1p0 rtfds typical performance characteristics v + = 5v; v - = gnd ; t a = +25c , unless otherwise noted. temperature - oc supply current - a tsm933 supply current vs temperature single - supply voltage - v supply current - a 2 1 tsm934 supply current vs low supply voltages 1.5 2.5 10 0.1 v ref - v hyst - mv in+ - in - - mv - 40 - 80 hysteresis control - 20 0 - 60 10 20 0 30 40 temperature - oc supply current - a - 15 10 tsm934 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 - 15 10 - 40 35 60 85 3 2 3.5 4 2.5 4.5 5 v+ = 5v, v - = 0v v+ = 3v, 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 2 8 10 4 12 14 16 18 v ohl v olh in+ input voltage - mv output voltage - v - 0.3 - 0.2 1 0 transfer function - 0.4 0 3 4 2 0.1 0.2 0.3 5 - 0.1 0.4
tsm931 - tsm93 4 tsm931_34ds r1p0 page 9 rtfds typical performance characteristics v + = 5v; v - = gnd ; t a = +25c , unless otherwise noted. response time - s output voltage - v 0 2 0 0 response time for various input overdrives (low - to - high) - 2 4 1 2 100 0 6 single - supply voltage - v response time - s 1.5 2 10 tsm93 4 response time at low supply voltages (low - to - high) 2.5 100 1 single - supply voltage - v current - ma 10 tsm934 source and sink current at low supply voltages 100 1 response time - s response time for various input overdrives (high - to - low) 10mv 20mv 50mv 20mv overdrive source current into 0.75v load total supply voltage - v source current - ma 2.5 3 short - circuit source current vs supply voltage 2 3.5 4 input voltage - m v output voltage - v input voltage - m v 8 5 3 4 100mv 10mv 20mv 50mv 100mv 100mv overdrive 1.5 2 2.5 80 0 120 160 40 200 out connected to v - sink current at v out = 0.4v 10 12 14 16 18 20 0 0 1 2 100 5 3 4 0 2 - 2 4 6 8 10 12 14 16 18 4.5 5 5.5 total supply voltage - v 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
tsm931 - tsm934 page 10 tsm931_34ds r1p0 rtfds pin functions pin name function tsm93 1 tsm93 2 tsm93 3 1 gnd ground. connect to v - for single - supply operation. output swings from v+ to gnd. 1 1 outa comparator a output. sinks and sources current. swings from v+ to v - . 2 2 2 v - negative supply. connect to ground for single - supply operation. 3 in+ comparator noninverting input 3 3 ina+ comparator a noninverting input 4 in - comparator inverting input 4 in b+ comparator b noninverting input 4 inb - comparator b 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 1.182v reference output with respect to v - . 7 7 7 v+ positive supply voltage 8 out comparator output. sinks and sources current. swings from v+ to gnd. 8 8 outb comparator b output. sinks and sources current. swings from v+ to v - . pin name function tsm93 4 1 outb comparator b output. sinks and sourc es current. swings from v+ to gnd . 2 outa comparator a output. sinks and sourc es current. swings from v+ 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 and sources current. swings from v+ to gnd . 16 outc comparator c output. sinks and sourc es current. swings from v+ to gnd .
tsm931 - tsm93 4 tsm931_34ds r1p0 page 11 rtfds block diagrams
tsm931 - tsm934 page 12 tsm931_34ds r1p0 rtfds theory of operation the tsm 93 1 C tsm 93 4 family of single/ dual / quad, low - voltage , micropower analog comparators provide excellent flexibility and performance while sourcing continuously up to 40ma of current. the tsm9 31 - tsm93 4 provide an on - board 1.182v 2 % reference voltage. to minimize glitches that can occur with parasitic feedback or a less than optimal board layout, the design of the tsm931 - tsm934 output stage is optimized to eliminate crowbar glitches as the output switches. to m inimize current consumption while providing flexibility, the tsm931 - tsm93 3 have an on - board hyst pin in ord er to add additional hysteresis. power - supply and input signal ranges the tsm931 - tsm934 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 power supply rails without dam age to the part. while the tsm931 and the tsm93 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 tsm931 and the tsm93 4 are compatible with ttl/cmos with a 5v voltage and the tsm932 and the tsm93 3 are compatible with ttl with a single +5v supply. low - v oltage operation: v+ = 1 .5 v (tsm93 4 only) due to a decrease in propagation delay and a reduction in output drive, the tsm9 31 - tsm93 3 cannot be used with a supply voltage much low er than 2.5v. however, the tsm93 4 can operate down to a supply voltage of 2v; however, as the s upply voltage reduces, the tsm93 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. furthermore, the input voltage range is extended to just below 1v the p ositive 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 tsm931 and the tsm93 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. having a different voltage on v - will not affect the output swing. for ttl applications , v+ can be set to +5v 10% and v - can be set anywhere between 0v and - 5v 10% . on the other hand, the tsm932 and the tsm93 3 do not have a gnd pin; hence, for ttl applications, v+ needs to be set to a +5v power supply and v - to 0v. furthermore, the output design of the tsm931 - tsm934 can source and sink more than 40ma and 5ma, respectively, while simultaneously maintaining a quiescent current in the microampere range. if the power di ssipation of the package is maintained within the max limit, the output can source pulses of 100ma of current with v+ set to +5v. in an effort to minimize external component count needed to address power supply feedback, the tsm931 - tsm934 output does not p roduce crowbar switching current as the output switches. with a 10 0 mv input overdrive, the propagation delay of the tsm931 - tsm934 is 4 s . voltage reference the tsm931 - tsm934 have an on - board 1.182v referenc e 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 15a and 8a 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 tsm931 - tsm934 . 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 tsm931 - tsm934 produces a peak - to - peak noise of about 0.3mv pp while the reference v oltage produces a peak - to - peak noise of about 1mv pp . 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.
tsm931 - tsm93 4 tsm931_34ds r1p0 page 13 rtfds applications information hysteresis as a result of circuit noise 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 - established technique to stabilizing analog comparator behavior and requi res 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 hysteresis band (v hb ) is defined as the voltage difference between the tw o trip points. when a comparators input voltages are equal, hysteresis effectively forces one comparator input to move quickly past the other input, moving the input out of the region where 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 (tsm931 - tsm9 3 3 ) 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 for the rising input voltage, v t hr , 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 factor of 2. the hyst pin can accep t 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 desired hysteresis band, consider th e equations below to acquire the values for resistors r1 and r2: r 1 v h 2 x i ref r 2 1 . 182 v h 2 i 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 the hyst pin input current. given r2 = 2.4 m , the current sourced by the refe rence is 0.5 a . this allows the hysteresis band and r1 to be approximated as follows: r1(k) v hb (mv) for the tsm932 - tsm933, the hysteresis is the same for both comparators. hysteresis (tsm93 4) relative to adding hysteresis with the hyst pin as was done for the tsm931 - tsm93 3, 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 figure 2. programming the hyst pin figure 1. threshold hysteresis band
tsm931 - tsm934 page 14 tsm931_34ds r1p0 rtfds feedback. the following procedure explains the steps to design the circuit for a desired hysteresis: 1. choosing r3. as the leakage current at the in+ pin is less than 1na, the current through r3 should be at least 100na to minimize offset voltage errors caused by the input leakage current. for r3 11.8m, the current through r3 is v ref /r3 at the trip point. in this case, a 10m resistor is a good standard value for r3. 2. next, th e desired hysteresis band ( v h b ) is set. in this example, v h b is set to 50mv. 3. calculating r1. r 1 r 3 x v h v + 10 m x 50 mv 5 v 100 k in this example, a 100k, 1% standard value resistor is selected for r1. 4. choose the trip point for v in rising (v thr ) , which is the threshold voltage at which the comparator switches its output from low to high as v in rises above the trip point . in this example, choose v thr = 3v. 5. calculating r2. r 2 1 v thr v ref x r 1 1 r 1 1 r 3 1 3 1 . 182 v x 100 k 1 100 k 1 10 m 65 . 44 k in this example, a 64.9k, 1% standard value resistor is selected for r2. 6. the last step is to verify the trip voltages and hysteresis band using the standard resistance values : v thr v ref x r 1 x 1 r 1 + 1 r 2 + 1 r 3 v thf v thr C r 1 x v + r 3 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 auto - off power source a timed auto power - off circuit can be designed as shown in figure 4 where t he outp ut of the tsm93 1 is the switched power - supply output. with an internal reference, hysteresis, high current output, and a 2.5 a supply current, the tsm93 1 provides a wealth of features that make it perfect for this application. while consuming only 3.5 a of quiescent cur rent with a 10ma load, the tsm93 1 is able to generate a voltage of vbatt C 0.12v. as shown in the figure, three resistors are used to generate a hysteresis band of 100mv and sets the in+ trip point to 50 mv when in+ is going low . the maximum power - on period of the out pin before power - down occurs figure 3. external hysteresis
tsm931 - tsm93 4 tsm931_34ds r1p0 page 15 rtfds can be determined by t he rc time constant as follows: r x c 4 . 6 s the period value will change depending on the leakage current and the voltage applied to the circuit. for instance : 2m x 10f x 4.6 s = 92 s . window detector the schematic shown in figure 5 is for a 4.5v undervoltage threshold detector and a 5.5v overvoltage th reshold detector using the tsm93 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 hysteresis desired. adding hysteresis to the circuit will minimize chattering on the output when the input volt age is close to the trip point. outa and outb generate the active low undervoltage indication and active - low overvoltage indication, respectively. if both outa and outb signals are anded together, the resulting output of the and gate is an active - high, pow er - good signal. to design the circuit, the following procedure needs to be performed: 1. as described in the section hysteresis (tsm931 - tsm933), 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 less than 1na, the current through r1 should be at least 100na to minimize offset voltage err ors 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 vin falls, the under voltage 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 figure 5. window detector figure 4. auto - off power switch operates on 2.5 a quiescent current.
tsm931 - tsm934 page 16 tsm931_34ds r1p0 rtfds 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 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 bar - graph level gauge a simple four - stage le vel detector is shown in figure 6 using the tsm93 4 . due to its high output source capability, the tsm921 is perfect for driving leds. when all of the leds are on, the threshold voltage is given as v in = (r1 + r2)/r1 volts. all other threshold voltages are scaled down accordingly by ?, ?, and ? the threshold voltage. the current through the leds is limited by the output resistors . level shifter figure 7 pr ovides a simple way to shift from bipolar 5v inputs to ttl signals by using the tsm934 . to protect the comparator inputs, 10k resistors are placed in series and do not have an effect on the performance of the circuit. two - stage low - voltage detector a two step, input voltage monitoring circuit can be designed using the tsm932 as shown in figure 8. in this circuit, when v in is above the low and fail thresholds, the outputs will be high. the design procedure used to design the window detector can be used to design this circuit. figure 6. bar - graph level gauge figure 7. level shifter: 5v input into cmos output
tsm931 - tsm93 4 tsm931_34ds r1p0 page 17 rtfds figure 8 . two - stage low - voltage detector
tsm931 - tsm934 page 18 tsm931_34ds 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 .
tsm931 - tsm934 tsm931_34ds r1p0 page 19 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
tsm931 - tsm934 page 20 touchstone semiconductor, inc. tsm931_34ds 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 semiconductor 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 license is granted by implication or oth erwise 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 applications using touchstone semic onductor components. to minimize the risk associated with customer products and applications, customers should provide adequate design and operating safeguards. trademarks and registered trademarks are the property of t heir 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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