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? 2007 microchip technology inc. ds21383c-page 1 tc1275/tc1276/tc1277 features ? precision v cc monitor for 3.3v systems ? 100 ms minimum reset , reset output duration ? output valid to v cc = 1.2v ?v cc transient immunity ? small 3-pin sot-23 package ? no external components applications ? computers ? embedded systems ? battery powered equipment ? critical p power supply monitoring device selection table note: ?x? denotes a suffix for v cc threshold (see table below). package type general description the tc1275/tc1276/tc1277 are cost-effective system supervisor circuits designed to monitor v cc in digital systems and provide a reset signal to the host processor when necessary. no external components are required. the reset output is driven active within 20 s of v cc falling through the reset voltage threshold. reset is maintained active for a minimum of 100 ms after v cc rises above the reset threshold. the tc1277 has an active-high reset output while the tc1275 and tc1276 have an active-low reset output. tc1275 and tc1277 each have a complimentary output while the tc1276 has an open drai n output. the output of the tc1275 and tc1276 is valid down to v cc = 1.2v. the tc1277 is valid down to v cc = 1.8v. all three devices are available in a 3-pin sot-23 package. the tc1275/tc1276/tc1277 devices are optimized to reject fast transient glitches on the v cc line. typical operating circuit part number order package temp. range tc1275-xenb complimentary 3-pin sot-23 -40c to +85c tc1276-xenb open-drain 3-pin sot-23 -40c to +85c tc1277-xenb complimentary 3-pin sot-23 -40c to +85c suffix reset v cc threshold (v) 53.06 10 2.88 20 2.55 v cc reset *(reset) gnd tc1275 tc1276 tc1277 1 2 3 *( ) is for tc1277 3-pin sot-23 tc1275 v cc v cc v cc reset reset input gnd gnd processor 1 2 3 3-pin reset monitors for 3.3v systems obsolete device
tc1275/tc1276/tc1277 ds21383c-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 power dissipation (t a 70c) 3-pin sot-23 (derate 4 mw/c above +70c) ................................................................230 mw 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 f unctional operation of the device at these or any other conditions above those indicated in the operation sections of the spec ifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. tc1275/tc1276 /tc1277 electri cal specifications recommended dc operating conditions: t a = -40c to +85c unless otherwise noted. typical values are at t a = +25c. symbol parameter min typ max units device test conditions v cc supply voltage 1.2 1.8 ? ? 5.5 5.5 v tc1275, tc1276 tc1277 note 1 dc electrical characteristics: t a = -40c to +85c unless otherwise noted. typical values are at t a = +25c. symbol parameter min typ max units test conditions v oh output voltage @ 0-500 av cc ? 0.5v v cc ? 0.1v ? v tc1275, tc1277 note 1 i oh output current @ 2.4 volts v cc = 5v v cc = 2.7v ? ? 13 1.3 ? ? ma tc1275 tc1277 note 2 i ol output current @ 0.4 volts +10 30 ? ma note 2, note 5 i cc operating current v cc < 5.5v v cctp < v cc < 5.5v v cc < v cctp ? ? ? 20 20 350 35 35 700 a tc1275, tc1277 tc1276 tc1276 note 3 note 3 note 3 v cctp-5 v cc trip point (tc1275/6/7-5) 2.98 3.06 3.15 v note 1 v cctp-10 v cc trip point (tc1275/6/7-10) 2.80 2.88 2.97 v note 1 v cctp-20 v cc trip point (tc1275/6/7-20) 2.47 2.55 2.64 v note 1 c out output capacitance ? 9 ? pf r p internal pull-up resistor 3.0 6.0 9.0 k tc1276 ac electrical characteristics: t a = -40c to +85c unless otherwise noted. typical values are at t a = +25c. symbol parameter min typ max units test conditions t rst reset active time 100 200 300 ms t rpd1 v cc detect to reset ? 20 50 s tc1275, tc1276 v cc(low) = 1v, figure 3-2 t rpd2 v cc detect to reset ? 20 50 s tc1277 v cc(low) = 1v, figure 3-4 t f v cc slew rate (v cctp (max) to v cctp (min)) 300 ? ? s figure 3-2 , figure 3-4 t r v cc slew rate (v cctp (min) to v cctp (max)) 0??ns figure 3-1 , figure 3-3 t rpu1 v cc detect to reset 100 200 300 ms tc1275, tc1276 note 4, figure 3-1 t rpu2 v cc detect to reset 100 200 300 ms tc1277 note 4, figure 3-3 note 1: all voltages referenced to ground. 2: measured with v cc 2.7 volts. 3: measured with reset output open for tc1275/tc1276; measured with reset output open for tc1277. 4: t r = 5 s. 5: a 1 k external resistor may be required in some applications for proper operation of the microprocessor reset control circuit when u sing the tc1276.
? 2007 microchip technology inc. ds21383c-page 3 tc1275/tc1276/tc1277 2.0 pin descriptions the descriptions of the pins are listed in table 2-1. table 2-1: pin function table pin no. (3-pin sot-23) symbol description 1 rese t (tc1275/ tc1276) reset output remains low while v cc is below the reset voltage threshold, and for 200 ms (100 ms minimum) after v cc rises above reset threshold. the output stage of the tc1275 is complimentary. the output stage of the tc1276 is open- drain. 1 reset (tc1277) reset output remains high while v cc is below the reset voltage threshold, and for 200 ms (100 ms minimum) after v cc rises above reset threshold. the output stage of the tc1277 is complimentary. 2v cc supply voltage (1.2v to 5.5v tc1275 and tc1276, 1.8v to 5.5v tc1277). 3gnd ground.
tc1275/tc1276/tc1277 ds21383c-page 4 ? 2007 microchip technology inc. 3.0 applications information 3.1 operation ? power monitor the tc1275/tc1276/tc1277 provide the function of detecting out-of-tolerance power supply conditions and warning a processor-b ased system of impending power failure. when v cc is detected as out-of- tolerance, the reset signal is asserted. on power-up, reset is kept active for approximately 200 ms after the power supply has reached the selected tolerance. this allows the power supply and microprocessor to stabilize before r eset is released. figure 3-1: timing diagram ? power up (tc1275/tc1276). figure 3-2: timing diagram ? power down (tc1275/tc1276). figure 3-3: timing diagram ? power up (tc1277). figure 3-4: timing diagram ? power down (tc1277). v cctp (max) v cctp (min) t r v cctp v cc reset t rpu 1 v oh v cc reset v cctp (max) v cctp v cctp (min) v ol t rpd1 t f t r t rpu2 v ol v cctp v cc r eset v cctp (max) v cctp (min) t f t rpd2 v cc v cctp (max) v oh reset v cctp v cctp (min) reset slews with v cc
? 2007 microchip technology inc. ds21383c-page 5 tc1275/tc1276/tc1277 3.2 v cc transient rejection the tc1275/tc1276/tc1277 provides accurate v cc monitoring and reset timing during power-up, power- down, and brownout/sag conditions, and rejects negative-going transients (glitches) on the power supply line. figure 3-5 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 brownout or power-down. transient immunity can be improved by adding a capacitor in close proximity to the v cc pin of the tc1275/tc1276/ tc1277. 3.3 reset signal integrity during power-down the tc1275 reset output is valid to v cc = 1.2v. below this voltage the output becomes an "open circuit" and does not sink current. this means cmos logic inputs to the p will be floating at an undeter- mined voltage. most digi tal systems are completely shut down well above this voltage. however, in situa- tions 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 3-6 ). 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). simi- larly, a pull-up resistor to v cc is required for the tc1277 to ensure a valid high reset for v cc below 1.8v. figure 3-5: maximum transient duration vs. overdrive fo r glitch rejection at +25c. figure 3-6: ensuring reset valid to v cc = 0v. reset comparator overdrive, [ v cctp - v cc ] (mv) 500 300 200 400 100 0 1 10 100 1000 maximum transient duration ( sec) t a v th duration overdrive v cc tc1275/6/7 tc1275 v cc v cc r1 100 k reset gnd
tc1275/tc1276/tc1277 ds21383c-page 6 ? 2007 microchip technology inc. 4.0 typical characteristics note: the graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. the performance charac teristics 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 slew rate (v/ sec) v cc to reset delay ( sec) 10000 1000 1 10 100 1000 10000 100000 100000 100 10 = 2v v t a = 25 c v cc detect to reset (reset) v cc to reset delay ( sec) 300 200 100 0 0 12 3 4 5 comparator overdrive (v) reset delays vs. comparator overdrive t a = 25 c
? 2007 microchip technology inc. ds21383c-page 7 tc1275/tc1276/tc1277 5.0 packaging information 5.1 package marking information tc1275 (v) code 2.55 da 2.88 db 3.06 dc tc1276 (v) code 2.55 ea 2.88 eb 3.06 ec tc1277 (v) code 2.55 fa 2.88 fb 3.06 fc 1 & = part number code + temperature range 2 and voltage ex: 1275-20 = d a 3 represents year and quarter code 4 represents production lot id code
tc1275/tc1276/tc1277 ds21383c-page 8 ? 2007 microchip technology inc. 3-lead plastic small outline transistor (tt or nb) [sot-23] notes: 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. 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 3 lead pitch e 0.95 bsc outside lead pitch e1 1.90 bsc overall height a 0.89 ? 1.12 molded package thickness a2 0.79 0.95 1.02 standoff a1 0.01 ? 0.10 overall width e 2.10 ? 2.64 molded package width e1 1.16 1.30 1.40 overall length d 2.67 2.90 3.05 foot length l 0.13 0.50 0.60 foot angle 0 ? 10 lead thickness c 0.08 ? 0.20 lead width b 0.30 ? 0.54 b n e e1 2 1 e e1 d a a1 a2 c l microchip technology drawing c04-104b
? 2007 microchip technology inc. ds21383c-page9 tc1275/tc1276/tc1277 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 package temperature range device device: tc1275: 3-pin reset monitor - complementary tc1276: 3-pin reset monitor - open-drain tc1277: 3-pin reset monitor - complementary reset v cc threshold voltage 5 = 3.06v 10 = 2.88v 15 = 2.55v temperature range: e = -40c to +85c package: nb = plastic small outline transistor (sot-23), 3-lead examples: a) tc1275 -10enbtr: 2.88v reset monitor b) tc1275 -15enbtr: 2.55v reset monitor c) tc1275 -5enbtr: 3.06v reset monitor a) tc1276 -10enbtr: 2.88v reset monitor b) tc1276 -15enbtr: 2.55v reset monitor c) tc1276 -5enbtr: 3.06v reset monitor a) tc1277 -10enbtr: 2.88v reset monitor b) tc1277 -15enbtr: 2.55v reset monitor c) tc1277 -5enbtr: 3.06v reset monitor xx reset v cc threshold
tc1275/tc1276/tc1277 ds21383c-page 10 ? 2007 microchip technology inc. notes:
? 2007 microchip technology inc. ds21383c-page 11 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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