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tsm971/72/73/82/84 page 1 ? 2014 silicon laboratories, in c. all rights reserved. features ? alternate source for: max971/max972/max973/max982/max984 ? ultra-low quiescent current over temperature tsm971 single+reference: 4 a (max) tsm972: dual comparator only: 4 a (max) tsm973/tsm982 dual+reference: 6 a (max) tsm984 quad+reference: 8.5 a (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 ? open-drain output stages for wired-or applications ? internal 1.182v1% reference: tsm971/tsm973 ? internal 1.182v2% reference: tsm982/tsm984 ? adjustable hysteresis : tsm971/tsm973/tsm982 ? separate output gnd pin: tsm971/tsm984 applications threshold detectors window comparator level translators oscillator circuits battery-powered systems description the tsm971/972/973/982/984 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, this comparator family can operate from single +2.5v to +11v supplies or from 1.25v to 5.5v dual supplies. the single tsm971 and the dual tsm972 draw less than 4 a (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 internal to the tsm971/tsm973 (1%) and the tsm982/tsm984 (2%). without complicated feedback configurations and only requiring two addi tional 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 tsm971 yes, 1% 1 yes tsm972 no 2 no tsm973 yes, 1% 2 yes tsm982 yes, 2% 2 yes tsm984 yes, 2% 4 no part temperature range package tsm971c 0oc to 70oc 8-pin msop/soic tsm971e -40oc to 85oc tsm972c 0oc to 70oc 8-pin msop/soic tsm972e -40oc to 85oc TSM973C 0oc to 70oc 8-pin msop/soic tsm973e -40oc to 85oc tsm982c 0oc to 70oc 8-pin msop/soic tsm982e -40oc to 85oc tsm984c 0oc to 70oc 16-pin soic tsm984e -40oc to 85oc
tsm971/72/73/82/84 page 2 tsm971/72/73/82/84 rev. 1.0 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 + 5v) to (v- - 0.3v) output voltage ref..................................................... (v+ + 0.3v) to (v- - 0.3v) out (tsm971, tsm984).................(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 +70c tsm98xe...............................................................-40c to +85c storage temperature range .................................-65c to +150c lead temperature (soldering, 10s) ......................................+300c ref???????????????????????.20ma out???????????????????????.50ma output short-circuit duration (v+ 5.5v) ...................continuous electrical and thermal stresses beyond thos e listed under ?absolute maximum ratings? ma y cause permanent damage to the device. these are stress ratings only and functional operati on of the device at these or any other condition beyond those indicated in the op erational sections of 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 tsm971cua+ taaz tube 50 tsm971csa+ ts971 tube 97 tsm971csa+t tape & reel 2500 tsm971cua+t tape & reel 2500 tsm971esa+ ts971e tube 97 tsm971esa+t tape & reel 2500
tsm971/72/73/82/84 tsm971/72/73/82/84 rev. 1.0 page 3 package/ordering information order number part marking carrier quantity order number part marking carrier quantity tsm972cua+ tabj tube 50 tsm972csa+ ts972 tube 97 tsm972csa+t tape & reel 2500 tsm972cua+t tape & reel 2500 tsm972esa+ ts972e tube 97 tsm972esa+t tape & reel 2500 order number part marking carrier quantity order number part marking carrier quantity TSM973Cua+ tabe tube 50 TSM973Csa+ ts973 tube 97 TSM973Csa+t tape & reel 2500 TSM973Cua+t tape & reel 2500 tsm973esa+ ts973e tube 97 tsm973esa+t tape & reel 2500
tsm971/72/73/82/84 page 4 tsm971/72/73/82/84 rev. 1.0 package/ordering information order number part marking carrier quantity order number part marking carrier quantity tsm982cua+ tabk tube 50 tsm982csa+ ts982 tube 97 tsm982csa+t tape & reel 2500 tsm982cua+t tape & reel 2500 tsm982esa+ ts982e tube 97 tsm982esa+t tape & reel 2500 order number part marking carrier quantity order number part marking carrier quantity tsm984cse+ ts984 tube 48 tsm984ese+ ts984e tube 48 tsm984cse+t tape & reel 2500 tsm984ese+t tape & reel 2500 lead-free program: silicon labs supplies only lead-free packaging. consult silicon labs for produ cts specified with wider oper ating temperature ranges.
tsm971/72/73/82/84 tsm971/72/73/82/84 rev. 1.0 page 5 electrical characteristics ? 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 tsm982; 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+ ? 1.3v v common-mode rejection ratio v- to (v+ ? 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 +70c, 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 +70c, 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 tsm971/72/73/82/84 rev. 1.0 electrical characteristics ? 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+ ? 1.3v v common-mode rejection ratio v- to (v+ ? 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 +70c, 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 +70c, 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 th e ?low-voltage operation: v+ = 1.5v (tsm984 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 tsm971/72/73/82/84 rev. 1.0 page 7 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 tsm971/72/73/82/84 rev. 1.0 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 - mv 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 tsm971/72/73/82/84 rev. 1.0 page 9 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 ou t = 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 tsm971/72/73/82/84 rev. 1.0 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 inverting input ? 5 4 ? inb- comparator b inverting input ? 6 ? 4 inb+ comparator b noninverting input ? 8 8 8 outb comparator b output. sinks current to v-. pin name function tsm984 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 tsm971/72/73/82/84 rev. 1.0 page 11 block diagrams
tsm971/72/73/82/84 page 12 tsm971/72/73/82/84 rev. 1.0 theory of operation the tsm971/972/973/982/984 family of single/dual/quad, low-voltage, micropower analog comparators provide ex cellent flexibility and performance while sourcing continuously up to 40ma of current. the tsm971, tsm973, tsm982, and the tsm984 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 hyst pin in order to add additional hysteresis. power-supply and input signal ranges the tsm971/972/973/982/984 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 power supply rails without damage to the part. while the tsm971 and the tsm984 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 tsm984 are compatible with ttl/cmos with a 5v voltage and the tsm972, tsm973, and tsm982 are compatible with ttl with a single +5v supply. low-voltage operation: v+ = 1.5v (tsm984 only) due to a decrease in propagation delay and a reduction in output drive, the tsm971/972/973/982 cannot be used with a supply voltage much lower than 2.5v. however, the tsm984 can operate down to a supply voltage of 2v; furthermore, as the supply voltage reduces, the tsm984 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 1.5v supply voltage. furthermore, the input voltage range is extended to just below 1v the positive 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 tsm984 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 having open-d rain outputs, the tsm971/972/973/982/984 can be used in wire- ored and level-shifting applications. on the other hand, the tsm972, tsm973, and the tsm982 do not have a gnd pin so the outputs sink current to v- . with a 100mv input overdrive, the propagation delay of the tsm971/972/973/982/984 is 4 s. voltage reference the tsm971/972/973 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% across a temperature range of 0c to +70c. the ref pin is able to source and sink 25 a 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 tsm971/972/973/982/ 984. despite having a large gain, if the input voltage is near or equal to the input offset voltage, the out put will randomly switch high and low. as a result, the tsm971/972/973/982/984 prod uces 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 noise or unintended parasitic feedback, many analog comparators often break into oscillation within their li near 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 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 hysteresis band (v hb ) is defined as the voltage difference between the two trip points. when a comparator?s input voltages are equal,
tsm971/72/73/82/84 tsm971/72/73/82/84 rev. 1.0 page 13 hysteresis effectively forces one comparator input to move quickly past the other input, moving the input out of the region where osc illation 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 tsm982) hysteresis can be genera ted 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 tr ip point for the rising input voltage, v thr , and decrease the trip point for the falling input voltage, v thf , by the same amount. if no hysteresis 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 accept a voltage bet ween 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 the equations below to acquire the values for resistors r1 and r2: r1 = v hb : 2 x i ref ; r2 = 1.182 - v hb 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 = 2.4m , 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 (tsm972 and tsm984) relative to adding hysteresis with the hyst pin as was done for the tsm971, tsm973, 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 figure 1. threshold hysteresis band figure 2. programming the hyst pin figure 3. external hysteresis
tsm971/72/73/82/84 page 14 tsm971/72/73/82/84 rev. 1.0 source current, upper th reshold variations will depend on the value of the pull-up resistor. board layout and bypassing while power-supply bypass capacitors are not typically required, it is good engineering practice to use 0.1 f bypass capacitors close to the device?s power supply pins when the power supply impedance is high, the power supply leads are long, or there is excessive noise on the power supply traces. to reduce stray 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 threshold detector using the tsm973. 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 cha ttering 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 both 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 i nput where the input voltage v in will appear larg er 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 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: r2 + r3 = r1 x l v oth v ref +v hys - 1 p = 294k ? x l 5.5v 1.182v +5mv - 1 p = 1.068m ? 4. calculating r2. as the input voltage v in falls, the undervoltage threshold should be 4.5v. choose r2 as follows: r2 = (r1 + r2+ r3) x : v ref -v hys ; v uth - 294k = (294k ? + 1.068m ? ) x : 1.182v-5mv ; 4.5 - 294k = 62.2k ? in this example, a 61.9k ? , 1% standard value resistor is selected for r2. 5. calculating r3. r3 = (r2 + r3) - r2 = 1.068m ? ? 61.9k ? = 1.006m ? in this example, a 1m ? , 1% standard value resistor is selected for r3. 6. using the equations bel ow, verify all resistor values selected: v oth = (v ref + v hys ) x : r1 + r2 + r3 ; r1 fi g ure 4. window detector
tsm971/72/73/82/84 tsm971/72/73/82/84 rev. 1.0 page 15 = 5.474v v oth = (v ref - v hys ) x : r1 + r2 + r3 ; (r1+r2) = 4.484v where the hysteresis voltage is given by: v hys = v ref x r5 r4 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, comparator b generates a ?low-battery? signal. level shifter figure 6 provides a simple way to shift from bipolar 5v inputs to ttl signals by using the tsm984. to protect the comparator inputs, 10k resistors are placed in series and do not have an effect on the performance of the circuit. fi g ure 5. batter y switchover circuit figure 6. level shifter: 5v input to single-ended 3.3v output
tsm971/72/73/82/84 page 16 tsm971/72/73/82/84 rev. 1.0 package outline drawing 8-pin soic package outline drawing (n.b., drawings are not to scale) 1.27 typ 0.33 - 0.51 4.80 - 5.00 3.73 - 3.89 0 - 8 3.81 ? 3.99 1 2 2 notes: does not include mold flash, protrusions or gate burns. mold flash, protrusions or gate burrs shall not exceed 0.15 mm per side. does not include inter-lead flash or protrusions. inter-lead flash or protrusions shall not exceed 0.25 mm per side. lead span/stand off height/coplanarity are considered as special characteristic (s). controlling dimensions are in mm. this part is compliant with jedec specification ms-012 lead span/stand off height/coplanarity are considered as special characteristic. 1 2 leadfarme thickness 0.19 ? 0.25 5.80 ? 6.20 0.10 ? 0.25 1.75 max 0.10 max 7' ref all side 7' ref all side 0.76 max 0.66 min 0.406 ? 0.863 0.546 ref 0.48 max 0.28 min 45' angle 0.25 5. 6. 1.32 ? 1.52 gauge plane 3. 4.
tsm971/72/73/82/84 tsm971/72/73/82/84 rev. 1.0 page 17 package outline drawing 8-pin msop package outline drawing (n.b., drawings are not to scale)
tsm971/72/73/82/84 page 18 silicon laboratories, inc. tsm971/72/73/82/84 rev. 1.0 400 west cesar chavez, austin, tx 78701 +1 (512) 416-8500 ? www.silabs.com package outline drawing 16-pin soic package outline drawing (n.b., drawings are not to scale) patent notice silicon labs invests in research and development to help our custom ers differentiate in the market with innovative low-power, s mall size, analog-intensive mixed-signal solutions. s ilicon labs' extensive patent portfolio is a testament to our unique approach and wor ld-class engineering team. the information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice. silicon laboratories assumes no responsibility for errors and om issions, and disclaims responsib ility for any consequences resu lting from the use of information included herein. additionally, silicon laborat ories assumes no responsibility for the functioning of undescr ibed features or parameters. silicon laboratories reserves the right to make c hanges without further notice. silicon laboratories makes no warra nty, representation or guarantee regarding the suitability of its pr oducts for any particular purpose, nor does silicon laboratories assume any liability arising out of the application or use of any product or circ uit, and specifically disclaims any and all liability, in cluding without limitation consequential or incidental damages. silicon laboratories products are not designed, intended, or authorized for use in applica tions intended to support or sustain life, or for any other application in wh ich the failure of the silicon laboratories product could create a situation where personal injury or death may occur. should buyer purchase or use silicon laboratories products for any such unintended or unaut horized application, buyer shall indemnify and hold silicon laboratories harmless against all claims and damages. silicon laboratories and silicon labs are tr ademarks of silicon laboratories inc. other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders.
disclaimer silicon laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or intending to use the silicon laboratories products. characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific device, and "typical" parameters provided can and do vary in different applications. application examples described herein are for illustrative purposes only. silicon laboratories reserves the right to make changes without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy or completeness of the included information. silicon laboratories shall have no liability for the consequences of use of the information supplied herein. this document does not imply or express copyright licenses granted hereunder to design or fabricate any integrated circuits. the products must not be used within any life support system without the specific written consent of silicon laboratories. a "life support system" is any product or system intended to support or sustain life and/or health, which, if it fails, can be reasonably expected to result in significant personal injury or death. silicon laboratories products are generally not intended for military applications. silicon laboratories products shall under no circumstances be used in weapons of mass destruction including (but not limited to) nuclear, biological or chemical weapons, or missiles capable of delivering such weapons. trademark information silicon laboratories inc., silicon laboratories, silicon labs, silabs and the silicon labs logo, cmems?, efm, efm32, efr, energy micro, energy micro logo and combinations thereof, "the world?s most energy friendly microcontrollers", ember?, ezlink?, ezmac?, ezradio?, ezradiopro?, dspll?, isomodem ?, precision32?, proslic?, siphy?, usbxpress? and others are trademarks or registered trademarks of silicon laboratories inc. arm, cortex, cortex-m3 and thumb are trademarks or registered trademarks of arm holdings. keil is a registered trademark of arm limited. all other products or brand names mentioned herein are trademarks of their respective holders. http://www.silabs.com silicon laboratories inc. 400 west cesar chavez austin, tx 78701 usa smart. connected. energy-friendly products www.silabs.com/products quality www.silabs.com/quality support and community community.silabs.com

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