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? 2007 microchip technology inc. ds21381d-page 1 tc1270/tc1271 features: ? precision v cc monitor for 1.8v, 2.7v, 3.0v, 3.3v and 5.0v nominal supplies ? manual reset input ? 140 ms minimum reset , reset output duration ? reset output valid to v cc = 1.0v (tc1270) ? low 7 a supply current ?v cc transient immunity ? small 4-pin sot-143 package ? no external components ? replacement for max811/812 and offers a lower threshold voltage option applications: ? computers ? embedded systems ? battery powered equipment ? critical p power supply monitoring typical operating circuit general description the tc1270 and tc1271 are cost-effective system supervisor circuits designed to monitor v cc in digital systems and provide a rese t signal to the host processor when necessary. a manual reset input is provided to override the reset monitor, and is suitable for use as a push button reset. no external components are required. the reset output is driven active within 20 s (4 s for f version) of v cc falling through the reset voltage threshold. reset is maintained active for a minimum of 140 ms after v cc rises above the reset threshold. the tc1271 has an active-high r eset output while the tc1270 has an active-low reset output. the output of the tc1270 is valid down to v cc = 1v. both devices are available in a 4-pin sot-143 package. the tc1270/tc1271 devices are optimized to reject fast transient glitches on the v cc line. low supply current of 7 a (v cc = 3.3v) makes these devices suitable for battery powered applications. package type tc1270 v cc v cc v cc reset reset input (active low) gnd gnd processor mr push button v cc tc1270 r eset gnd tc1270 tc1271 1 2 tc1271 (reset) 3 4 mr 4-pin reset monitors
tc1270/tc1271 ds21381d-page 2 ? 2007 microchip technology inc. 1.0 electrical characteristics absolute maximum ratings? supply voltage (v cc to gnd) .............................+6.0v reset , reset ............................ -0.3v to (v cc + 0.3v) input current, v cc ..............................................20 ma output current, reset , reset...........................20 ma operating temperature range.............-40c to +85c storage temperature range ..............-65c to +150c ? stresses above 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 conditions above those indicated in the operation sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. electrical specifications electrical characteristics: v cc = 5v for l/m versions, v cc = 3.3v for t/s versions, v cc = 3v for r version, v cc =2.0v for f version. unless otherwise noted, t a = -40c to +85c. typical values are at t a = +25c. (note 1) . symbol parameter min typ max units test conditions v cc v cc range 1.2 ? 5.5 v i cc supply current ? 7 15 a v cc > v th , for l/m/r/s/t/f ?1015av cc < v th , for l/m/r/s/t ?612av cc < v th , for f v th reset threshold 4.54 4.50 4.63 ? 4.72 4.75 v v tc127_l; t a = +25c t a = -40c to +85c 4.30 4.25 4.38 ? 4.46 4.50 v v tc127_m; t a = +25c t a = -40c to +85c 3.03 3.00 3.08 ? 3.14 3.15 v v tc127_t; t a = +25c t a = -40c to +85c 2.88 2.85 2.93 ? 2.98 3.00 v v tc127_s; t a = +25c t a = -40c to +85c 2.58 2.55 2.63 ? 2.68 2.70 v v tc127_r; t a = +25c t a = -40c to +85c 1.71 1.70 1.75 ? 1.79 1.80 v v tc127_f; t a = +25c t a = -40c to +85c reset threshold tempco ? 30 ? ppm/c v cc to reset delay ? ? 20 5 ? ? s v cc = v th to v th ? 125 mv; l/m/r/s/t/f t rp reset active time-out period 140 280 560 ms v cc = v th(max) t mr mr minimum pulse width 10 ? ? s mr glitch immunity ? 0.1 ? s t md mr to reset propagation delay ? 0.5 ? s v ih mr input threshold 2.3 ? ? v v cc > v th(max) , tc127_l/m 0.7 v cc ?? vv cc > v th(max) , tc127_r/s/t/f v il ??0.8 v v cc > v th(max) , tc127_l/m ? ? 0.15 v cc v v cc > v th(max) , tc127_r/s/t/f mr pull-up resistance 10 20 40 k v oh reset output voltage high (tc1271) 0.8 v cc ?? vi source = 150 a; v cc v th(min) note 1: production testing done at t a = +25c, over temperature limits ensured by design. 2: reset output for tc1270, reset output for tc1271.
? 2007 microchip technology inc. ds21381d-page 3 tc1270/tc1271 v ol reset output voltage low (tc1271) ? ? 0.2 v tc1271f only, i sink = 500 a, v cc =v th(max) ? ? 0.3 v tc1271r/s/t only, i sink = 1.2 ma, v cc =v th(max) ? ? 0.4 v tc1271l/m only, i sink =3.2ma, v cc =v th(max) v ol reset output voltage low (tc1270) ? ? 0.3 v tc1270r/s/t only, i sink = 1.2 ma, v cc =v th(min) tc1270f only: i sink = 500 a, v cc =v th(min) ? ? ? ? 0.4 tbd v v tc1270l/m only, i sink = 3.2 ma, v cc =v th(min) i sink =50a, v cc >1.0v v oh reset output voltage high (tc1270) v cc ? 1.5 ? ? v tc1270l/m only, i source = 800 a, v cc =v th(max) 0.8 v cc ? ? v tc1270r/s/t/f only, i source = 500 a, v cc =v th(max) electrical specifications (continued) electrical characteristics: v cc = 5v for l/m versions, v cc = 3.3v for t/s versions, v cc = 3v for r version, v cc = 2.0v for f version. unless otherwise noted, t a = -40c to +85c. typical values are at t a = +25c. (note 1) . symbol parameter min typ max units test conditions note 1: production testing done at t a = +25c, over temperature limits ensured by design. 2: reset output for tc1270, reset output for tc1271.
tc1270/tc1271 ds21381d-page 4 ? 2007 microchip technology inc. 2.0 typical characteristics note: the graphs and tables provided following this note ar e a statistical summary based on a limited number of samples and are provided for informational purposes on ly. the performance characteristics listed herein are not tested or guaranteed. in some graphs or t ables, the data presented ma y be outside the specified operating range (e.g., outside specified power suppl y range) and therefore outs ide the warranted range. v cc = 1v temperature (c) 8 10 12 14 6 4 2 0 -40 020 -20 40 60 85 supply current ( a) supply current vs.temperature (no load, tc127xr/s/t/f) v cc = 5v v cc = 3v temperature (c) 30 40 50 20 10 0 -40 0 20 -20 40 60 85 power-down reset delay ( sec) power-down reset delay vs. temperature (tc127xf) v od = 20mv v od = 100mv v od = 200 mv temperature (c) 240 245 250 235 230 225 -40 0 20 -20 40 60 85 power-up reset timeout (msec) power-up reset time-out vs. temperature tc127xl/m tc127xr/s/t/f 8 6 4 2 0 temperature (c) -40 020 -20 40 60 85 supply current ( a) supply current vs.temperature (no load, tc127xl/m) v cc = 5v v cc = 3v v cc = 1v l/m r/s/t temperature (c) 30 40 50 20 10 0 -40 0 20 -20 40 60 85 power-down reset delay ( sec) power-down reset delay vs. temperature (tc127xl/m/r/s/t) v od = 20 mv v od = 20 mv v od = 100 mv v od = 200 mv v od = 100 mv v od = 200 mv 1.0010 1.0020 1.0030 1.0000 0.9990 0.9980 0.9970 0.9960 0.9950 0.9940 temperature (c) -40 10 35 -15 65 60 normalized threshold (v) normalized reset threshold vs. temperature
? 2007 microchip technology inc. ds21381d-page 5 tc1270/tc1271 3.0 pin descriptions the descriptions of the pins are listed in table 3-1 . table 3-1: pin function table 3.1 ground terminal (gnd) gnd provides the negative reference for the analog input voltage. typically, the circuit ground is used. 3.2 reset output (reset ) (tc1270) reset output remains low while v cc is below the reset voltage threshold (v trip ). once the device voltage (v cc ) returns to a high level (v trip + v hys ), the device will remain in reset for the reset delay timer (t rst ). after that time expires, the reset pin will be driven to the high state. 3.3 reset output (reset) (tc1271) reset output remains high while v cc is below the reset voltage threshold (v trip ). once the device voltage (v cc ) returns to a high level (v trip + v hys ), the device will remain in reset for the reset delay timer (t rst ). after that ti me expires, the reset pin will be driven to the low state. 3.4 manual reset (mr ) the manual reset (mr ) input pin allows a push button switch to easily be connec ted to the system. when the push button is depressed, it forces a system reset. this pin has circuitry that filters noise that may be present on the mr signal. the mr pin is active-low and has an internal pull-up resistor. 3.5 supply voltage (v cc ) v cc can be used for power supply monitoring or a voltage level that requires monitoring. pin no. symbol description 1 gnd ground 2 reset ( tc1270) r eset output remains low while v cc is below the reset voltage threshold, and for at least 140 ms min. after v cc rises above reset threshold 2 reset (tc1271) reset output remains high while v cc is below the reset voltage threshold, and for at least 140 ms min. after v cc rises aboev reset threshold 3mr manual reset input generates a reset when mr is below v il 4v cc supply voltage
tc1270/tc1271 ds21381d-page 6 ? 2007 microchip technology inc. 4.0 applications information 4.1 v cc transient rejection the tc1270/tc1271 provides accurate v cc monitoring and reset timing during power-up, power-down, and brownout/sag conditions, and rejects negative-going transients (g litches) on the power supply line. figure 4-3 shows the maximum transient duration vs. maximum negative excursion (overdrive) for glitch rejection. any combination of duration and overdrive that lays under the curve will not generate a reset signal. combinations above the curve are detected as a brown-out or power-down. transient immunity can be improved by adding a capacitor in close proximity to the v cc pin of the tc1270/tc1271. figure 4-1: maximum transient duration vs. overdrive fo r glitch rejection at +25c. 4.2 reset signal integrity during power-down the tc1270 reset output is valid to v cc =1.0v. below this voltage the output becomes an ?open circuit? and does not sink current. this means cmos logic inputs to the microprocessor will be floating at an undetermined voltage. most digital systems are completely shut down well above this voltage. however, in situ ations where reset must be maintained valid to v cc = 0v, a pull-down resistor must be connected from reset to ground to discharge stray capacitances and hold the output low ( figure 4-2 ). this resistor value, though not critical, should be chosen such that it does not appreciably load reset under normal operation (100 k will be suitable for most applications). similarly, a pull-up resistor to v cc is required for the tc1271 to ensure a valid high reset for v cc below 1.1v. figure 4-2: ensuring reset valid to v cc = 0v. 4.3 processors with bidirectional i/o pins some microprocessor?s (such as motorola 68hc11) have bidirectional reset pins. depending on the current drive capability of the processor pin, an indeter- minate logic level may result if there is a logic conflict. this can be avoided by adding a 4.7 k resistor in series with the output of the tc1270/tc1271 ( figure 4-3 ). if there are other components in the sys- tem which require a reset signal, they should be buff- ered so as not to load the reset line. if the other components are required to follow the reset i/o of the microprocessor, the buffer should be connected as shown with the solid line. figure 4-3: interfacing to bidirectional reset i/o. reset comparator overdrive, v th - v cc (mv) 400 240 160 320 80 0 1 10 100 1000 maximum transient duration (msec) t a = +25c v th duration overdrive v cc tc127lmj tc127xr/s/t tc1270 v cc v cc r1 100k reset gnd tc1270 v cc reset gnd reset gnd buffered reset to other system components buffer p 4.7k v cc v cc
? 2007 microchip technology inc. ds21381d-page 7 tc1270/tc1271 5.0 packaging information 5.1 package marking information 5.2 taping form 1 1 2 3 4 1 & = part number code + threshold voltage 2 (two-digit code) part number (v) tc1270 code tc1270lerctr 4.63 s1 tc1270merctr 4.38 s2 tc1270terctr 3.08 s3 tc1270serctr 2.93 s4 tc1270rerctr 2.63 s5 tc1270ferctr 1.75 s7 part number (v) tc1271 code tc1271lerc tr 4.63 t1 tc1271merc tr 4.38 t2 tc1271terc tr 3.08 t3 tc1271serc tr 2.9 t4 tc1271rerc tr 2.63 t5 tc1271ferc tr 1.75 t7 3 represents year and quarter code 4 represents production lot id code device marking p, pitch w, width of carrier tape user direction of feed pin 1 standard reel component orientation reverse reel component orientation pin 1 for tr suffix device (mark right side up) package carrier width (w) pitch (p) part per full reel reel size 4-pin sot-143 8 mm 4 mm 3000 7 in.
tc1270/tc1271 ds21381d-page 8 ? 2007 microchip technology inc. 4-lead plastic small outline transistor (rc) [sot-143] notes: 1. significant characteristic. 1. dimensions d and e1 do not include mold flash or protrusions. mold flash or protrusions shall not exceed 0.25 mm per side. 2. dimensioning and tolerancing per asme y14.5m. bsc: basic dimension. theoretically exact value shown without tolerances. ref: reference dimension, usually without tolerance, for information purposes only. note: for the most current package drawings, please see the microchip packaging specification located at http://www.microchip.com/packaging units millimeters dimension limits min nom max number of pins n 4 pitch e 1.92 bsc pin1 offset e1 0.20 bsc overall height a 0.80 ? 1.22 molded package thickness a2 0.75 0.90 1.07 standoff a1 0.01 ? 0.15 overall width e 2.10 ? 2.64 molded package width e1 1.20 1.30 1.40 overall length d 2.67 2.90 3.05 foot length l 0.13 0.50 0.60 footprint l1 0.54 ref foot angle 0 ? 8 lead thickness c 0.08 ? 0.20 lead 1 width b1 0.76 ? 0.94 leads 2, 3 & 4 width b 0.30 ? 0.54 d e e /2 n e e 1 2 1 e1 a a 1 b2 a2 3x b c l l 1 microchip technology drawing c04-031b
? 2007 microchip technology inc. ds21381d-page 9 tc1270/tc1271 appendix a: revision history revision d (february 2007) ? section 5.0 ?packaging information? : corrected sot-143 packaging information. ? section 3.0 ?pin descriptions? : added pin descriptions. ? added disclaimer on package outline drawing. ? updated package outline drawing. ? section 1.0 ?electri cal characteristics? : refo- matted table. revision c (june 2006) ? enhanced sot-143 packaging information. revision b (may 2002) ? undocumented changes. revision a (march 2002) ? original release of this document.
tc1270/tc1271 ds21381d-page 10 ? 2007 microchip technology inc. notes:
? 2007 microchip technology inc. ds21381d-page 11 tc1270/tc1271 product identification system to order or obtain information, e.g., on pricing or de livery, refer to the factory or the listed sales office . part no. x xx threshold package temperature range device device tc1270: 4-pin reset monitor tc1271: 4-pin reset monitor threshold voltage (typical) l = 4.63 m = 4.38 t = 3.08 s = 2.93 r = 2.63 f = 1.75 temperature range e = -40 c to +85 c package rctr = plastic small outline transistor (rc) sot-143, 4 lead, (tape and reel). examples: a) tc1270lerctr: 4.63v b) tc1270merctr: 4.38v c) tc1270terctr: 3.08v d) tc1270sercpbtr: 2.93v e) tc1270serctr: 2.93v f) tc1270rerctr: 2.63v g) tc1270ferctr: 1.75v a) tc1271lerctr: 4.63v b) tc1271merctr: 4.38v c) tc1271terctr: 3.08v d) tc1271serctr: 2.93v e) TC1271RERCTR: 2.63v f) tc1271ferctr: 1.75v x voltage
tc1270/tc1271 ds21381d-page 12 ? 2007 microchip technology inc. notes:
? 2007 microchip technology inc. ds21381d-page 13 information contained in this publication regarding device applications and the like is prov ided only for your convenience and may be superseded by updates. it is your responsibility to ensure that your application me ets with your specifications. microchip makes no representations or warranties of any kind whether express or implied, written or oral, statutory or otherwise, related to the information, including but not limited to its condition, quality, performance, merchantability or fitness for purpose . microchip disclaims all liability arising from this information and its use. use of microchip devices in life support and/or safe ty applications is entirely at the buyer?s risk, and the buyer agrees to defend, indemnify and hold harmless microchip from any and all damages, claims, suits, or expenses resulting fr om such use. no licenses are conveyed, implicitly or ot herwise, under any microchip intellectual property rights. trademarks the microchip name and logo, the microchip logo, accuron, dspic, k ee l oq , k ee l oq logo, micro id , mplab, pic, picmicro, picstart, pro mate, powersmart, rfpic, and smartshunt are registered trademarks of microchip technology incorporated in the u.s.a. and other countries. amplab, filterlab, linear active thermistor, migratable memory, mxdev, mxlab, ps logo, seeval, smartsensor and the embedded control solutions company are registered trademarks of microc hip technology incorporated in the u.s.a. analog-for-the-digital age, a pplication maestro, codeguard, dspicdem, dspicdem.net, dspicworks, ecan, economonitor, fansense, flexrom, fuzzylab, in-circuit serial programming, icsp, icepic, mindi, miwi, mpasm, mplab certified logo, mplib, mplink, pickit, picdem, picdem.net, piclab, pictail, powercal, powerinfo, powermate, powertool, real ice, rflab, rfpicdem, select mode, smart serial, smarttel, total endurance, uni/o, wiperlock and zena are trademarks of microchip technology incorporated in the u.s.a. and other countries. sqtp is a service mark of mi crochip technology incorporated in the u.s.a. all other trademarks mentioned herein are property of their respective companies. ? 2007, microchip technology incorporated, printed in the u.s.a., all rights reserved. printed on recycled paper. note the following details of the code protection feature on microchip devices: ? microchip products meet the specification cont ained in their particular microchip data sheet. ? microchip believes that its family of products is one of the mo st secure families of its kind on the market today, when used i n the intended manner and under normal conditions. ? there are dishonest and possibly illegal meth ods used to breach the code protection fe ature. all of these methods, to our knowledge, require using the microchip pr oducts in a manner outside the operating specif ications contained in microchip?s data sheets. most likely, the person doing so is engaged in theft of intellectual property. ? microchip is willing to work with the customer who is concerned about the integrity of their code. ? neither microchip nor any other semiconduc tor manufacturer can guarantee the security of their code. code protection does not mean that we are guaranteeing the product as ?unbreakable.? code protection is constantly evolving. we at microchip are committed to continuously improving the code protection features of our products. attempts to break microchip?s c ode protection feature may be a violation of the digital millennium copyright act. if such acts allow unauthorized access to your softwar e or other copyrighted work, you may have a right to sue for relief under that act. microchip received iso/ts-16949:2002 certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona, gresham, oregon and mountain view, california. the company?s quality system processes and procedures are for its pic ? mcus and dspic ? dscs, k ee l oq ? code hopping devices, serial eeproms, microperipherals, nonvolatile memory and analog products. in addition, microchip?s quality system for the design and manufacture of development syst ems is iso 9001:2000 certified.
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