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? 2007 microchip technology inc. ds21384d-page 1 tc1278/tc1279 features ? precision v cc monitor for 5.0v system supplies ? 250 ms minimum reset output duration ? output valid to v cc = 1.2v ?v cc transient immunity ? small 3-pin sot-23 package ? no external components ? internal pull-up resistor ? available in 3 different voltage detection levels: - 4.625v (typ.), -5 suffix - 4.375v (typ.), -10 suffix - 4.125v (typ.), -15 suffix applications ? computers ? embedded systems ? battery powered equipment ? critical p power supply monitoring typical operating circuit general description the tc1278/tc1279 are cost-effective system super- visor 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 open-drain output uses an internal pull-up resistor of approximately 6 k . the reset output is driven active within 5 s of v cc falling through the reset voltage threshold. reset is maintained active for a minimum of 250 ms after v cc rises above the reset threshold. the tc1278 has an active-high reset output, while the tc1279 has an active-low reset output, with both devices having an open-drain output stage. the output is valid down to v cc = 1.2v. both devices are available in a 3-pin sot- 23 package. package type reset gnd + ? v cc v ref internal pull-up 6k resistor tc1279 tc1278 has an active-h igh reset output. v cc (tc1278) reset gnd tc1278 tc1279 1 2 3 3-pin sot-23 (tc1279) reset 3-pin reset monitors for 5v systems obsolete device
tc1278/tc1279 ds21384d-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........... ........... ............ ....20 ma power dissipation (t a 70c) 3-pin sot-23 (derate 4mw/c above +70c) ................................................................230 mw operating temperature range.............-40c to +85c storage temperature range ..............-65c to +150c ? stresses above those li sted 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. dc characteristics electrical specifications: unless otherwise indicated, t a = -40c to +85c. typical values are at t a = +25c. parameters sym min typ max units conditions supply voltage v cc 1.2 ? 5.5 v note 1 low level @ reset (tc1278) reset (tc1279) v ol ??0.4v note 1 output current @ 0.4 volts i ol +8 ? ? ma note 2 operating current: tc1278 i cc1 ?0.92.0mav cc > v cctp(max) , reset = 1, (note 3) tc1279 ? ? 40 a v cc > v cctp(max) , reset = 1, note 4 operating current: tc1278 i cc2 ? ? 40 a v cc < v cctp(min) , reset = 0, (note 4) tc1279 ?0.92.0mav cc < v cctp(min) , reset = 0, (note 3) v cc trip point (tc1278/9-5) v cctp-5 4.50 4.625 4.74 v note 1 v cc trip point (tc1278/9-10) v cctp-10 4.25 4.375 4.49 v note 1 v cc trip point (tc1278/9-15) v cctp-15 4.00 4.125 4.24 v note 1 output capacitance c out ?9?pf internal pull-up resistor r p 369k note 1: all voltages referenced to ground. 2: a 1 k external resistor may be required in some applic ations for proper operation of the microprocessor reset control circuit when using the tc1279. v cc = 1.8v. 3: operating current is specified with the open-d rain output in the active (?on?) condition. 4: operating current is specified with the open-dra in output in the non-active (?off?) condition.
? 2007 microchip technology inc. ds21384d-page 3 tc1278/tc1279 ac characteristics electrical specifications: unless otherwise indicated, t a = -40c to +85c. typical values are at t a = +25c. parameters sym min typ max units conditions reset active time t rst 250 350 450 ms v cc detect to reset (tc1279) t rpd1 ?2 5s figure 3-2 v cc detect to reset (tc1278) t rpd2 ?2 5s figure 3-4 v cc slew rate (4.75v-4.00v) t f 300 ? ? s figure 3-2 , figure 3-4 v cc slew rate (4.00v-4.75v) t r 0??ns figure 3-1 , figure 3-3 v cc detect to reset (tc1279) t rpu1 250 350 450 ms figure 3-1 v cc detect to reset (tc1278) t rpu2 250 350 450 ms figure 3-3
tc1278/tc1279 ds21384d-page 4 ? 2007 microchip technology inc. 2.0 pin descriptions the descriptions of the pins are listed in table 2-1 . table 2-1: pin function table 2.1 reset (tc1279) reset output remains low while v cc is below the reset voltage threshold, and for 350 ms (250 ms min.) after v cc rises above reset threshold. the output stage of the tc1279 is open-drain. 2.2 reset (tc1278) reset output remains high while v cc is below the reset voltage threshold, and for 350 ms (250 ms min.) after v cc rises above reset threshold. the output stage of the tc1278 is open-drain. 2.3 v cc supply voltage (1.2v to 5.5v). 2.4 ground device ground. pin no. symbol function 1 reset (tc1279) reset output 1 reset (tc1278) reset output 2v cc supply voltage (1.2v to 5.5v). 3 gnd ground.
? 2007 microchip technology inc. ds21384d-page 5 tc1278/tc1279 3.0 applications information 3.1 operation ? power monitor the tc1278/tc1279 provide the function of detecting out-of-tolerance power supply conditions and warning a processor-based 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 350 ms after the power supply has reached the selected toleranc e. this allows the power supply and microprocessor to stabilize before reset is released. figure 3-1: tc1279 power up timing diagram. figure 3-2: tc1279 power-down timing diagram. figure 3-3: tc1278 power-up timing diagram. figure 3-4: tc1278 power-down timing diagram. 4.75v 4.00v t r v cctp v cc reset t rpu1 v oh v cc reset 4.75v v cctp 4.00v v ol t rpd1 t f t r t rpu2 v ol v cctp v cc reset v cctp(max) v cctp(min) t f t rpd2 v cc 4.74v v oh reset v cctp 4.00v reset slews with v cc
tc1278/tc1279 ds21384d-page 6 ? 2007 microchip technology inc. 3.2 v cc transient rejection the tc1278/tc1279 provides accurate v cc monitor- ing and reset timing during power-up, power-down, and brownout/sag conditions. furthermore, it rejects negative-going transients (g litches) 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 tc1278/tc1279. figure 3-5: maximum transient duration vs. overdrive fo r glitch rejection at +25c. reset comparator overdrive, [v cctp - v cc ] (mv) 5 3 2 4 1 0 1 5 100 1000 maximum transient duration (sec) t a = +25c v cctp duration overdrive v cc tc1278/9
? 2007 microchip technology inc. ds21384d-page 7 tc1278/tc1279 4.0 packaging information 4.1 package marking information part number code tc1278-5enb pa tc1278-10enb pb tc1278-15enb pc tc1279-5enb ra tc1279-10enb rb tc1279-15enb rc 3-pin sot-23 1 2 4 3 1 & = part number code + temperature range 2 and voltage 3 represents year and 2-month code 4 represents production lot id code
tc1278/tc1279 ds21384d-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. ds21384d-page 9 tc1278/tc1279 product identification system to order or obtain information, e.g., on pricing or de livery, refer to the factory or the listed sales office . device tc1278: 3-pin reset monitor for 5v systems tc1279: 3-pin reset monitor for 5v systems reset v cc threshold: 5 = 4.625v 10 = 4.375v 15 = 4.125v temperature range e = -40 c to +85 c package nbtr = plastic small outline transistor, (sot23), 3-lead (tape and reel) part no. x xx package temperature range device examples: a) tc1278-5enbtr: 4.625 reset b) tc1278-10enbtr: 4.375 reset c) tc1278-15enbtr: 4.125 reset a) TC1279-5ENBTR: 4.625 reset b) tc1279-10enbtr: 4.375 reset c) tc1279-15enbtr: 4.125 reset -xx reset v cc threshold
tc1278/tc1279 ds21384d-page 10 ? 2007 microchip technology inc. notes:
? 2007 microchip technology inc. ds21384d-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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