View TC1278_1986630.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

? 2003 microchip technology inc. ds21384c-page 1 m TC1278/tc1279 features ? precision v cc monitor for 5.0v system supplies ? 250 msec minimum reset output duration ? output valid to v cc = 1.2v ?v cc transient immunity ? small 3-pin sot-23b 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 sec of v cc falling through the reset voltage threshold. reset is maintained active for a minimum of 250 msec 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- 23b package. package type reset gnd + ? v cc v ref internal pull-up 6k ? resistor tc1279 TC1278 has an active-high reset output. v cc (TC1278) reset gnd TC1278 tc1279 1 2 3 note: 3-pin sot-23b is equivalent to 3-pin sot-23b (tc1279) reset jedec to-236. 3-pin reset monitors for 5v systems
TC1278/tc1279 ds21384c-page 2 ? 2003 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-23b (derate 4mw/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 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. 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 ??40av cc > v cctp(max) , reset = 1, note 4 operating current: TC1278 i cc2 ??40av 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 applications 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-drain output in the active (?on?) condition. 4: operating current is specified with the open-drain output in the non-active (?off?) condition.
? 2003 microchip technology inc. ds21384c-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 msec v cc detect to reset (tc1279) t rpd1 ?2 5secfigure3-2 v cc detect to reset (TC1278) t rpd2 ?2 5secfigure3-4 v cc slew rate (4.75v-4.00v) t f 300 ? ? sec figure 3-2, figure 3-4 v cc slew rate (4.00v-4.75v) t r 0 ? ? nsec figure 3-1, figure 3-3 v cc detect to reset (tc1279) t rpu1 250 350 450 msec figure 3-1 v cc detect to reset (TC1278) t rpu2 250 350 450 msec figure 3-3
TC1278/tc1279 ds21384c-page 4 ? 2003 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 msec (250 msec 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 msec (250 msec 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 1rese t (tc1279) reset output 1 reset (TC1278) rest output 2v cc supply voltage (1.2v to 5.5v). 3 gnd ground.
? 2003 microchip technology inc. ds21384c-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 msec after the power supply has reached the selected tolerance. 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 ds21384c-page 6 ? 2003 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 (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 TC1278/tc1279. figure 3-5: maximum transient duration vs. overdrive for 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
? 2003 microchip technology inc. ds21384c-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-23b 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 ds21384c-page 8 ? 2003 microchip technology inc. 3-lead plastic small outline transistor (nb) (sot-23) 10 5 0 10 5 0 mold draft angle bottom 10 5 0 10 5 0 mold draft angle top 0.51 0.44 0.37 .020 .017 .015 b lead width 0.18 0.14 0.09 .007 .006 .004 c lead thickness 10 5 0 10 5 0 foot angle 0.55 0.45 0.35 .022 .018 .014 l foot length 3.04 2.92 2.80 .120 .115 .110 d overall length 1.40 1.30 1.20 .055 .051 .047 e1 molded package width 2.64 2.37 2.10 .104 .093 .083 e overall width 0.10 0.06 0.01 .004 .002 .000 a1 standoff 1.02 0.95 0.88 .040 .037 .035 a2 molded package thickness 1.12 1.01 0.89 .044 .040 .035 a overall height 1.92 .076 p1 outside lead pitch (basic) 0.96 .038 p pitch 3 3 n number of pins max nom min max nom min dimension limits millimeters inches* units 2 1 p d b n e e1 l c a2 a a1 p1 * controlling parameter notes: dimensions d and e1 do not include mold flash or protrusions. mold flash or protrusions shall not exceed .010? (0.254mm) per side. jedec equivalent: to-236 drawing no. c04-104 significant characteristic
? 2003 microchip technology inc. ds21384c-page 9 TC1278/tc1279 product identification system to order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office . sales and support part no. x xx package te m per a tur e range device device TC1278: 3-pin reset monitor for 3.3v 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 = 3ld sot23 (tape and reel) 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 data sheets products supported by a preliminary data sheet may have an errata sheet describing minor operational differences and recommended workarounds. to determine if an errata sheet exists for a particular device, please contact one of the following: 1. your local microchip sales office 2. the microchip corporate literature center u.s. fax: (480) 792-7277 3. the microchip worldwide site (www.microchip.com) please specify which device, revision of silicon and data sheet (include literature #) you are using. customer notification system register on our web site (www.microchip.com/cn) to receive the most current information on our products.
TC1278/tc1279 ds21384c-page 10 ? 2003 microchip technology inc. notes:
? 2003 microchip technology inc. ds21384c-page 11 information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. it is your responsibility to ensure that your application meets with your specifications. no representation or warranty is given and no liability is assumed by microchip technology incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. use of microchip?s products as critical components in life support systems is not authorized except with express written approval by microchip. no licenses are conveyed, implicitly or otherwise, under any intellectual property rights. trademarks the microchip name and logo, the microchip logo, dspic, k ee l oq , mplab, pic, picmicro, picstart, pro mate and powersmart are registered trademarks of microchip technology incorporated in the u.s.a. and other countries. filterlab, micro id , mxdev, mxlab, picmaster, seeval and the embedded control solutions company are registered trademarks of microchip technology incorporated in the u.s.a. accuron, application maestro, dspicdem, dspicdem.net, economonitor, fansense, flexrom, fuzzylab, in- circuit serial programming, icsp, icepic, microport, migratable memory, mpasm, mplib, mplink, mpsim, picc, pickit, picdem, picdem.net, powercal, powerinfo, powermate, powertool, rflab, rfpic, select mode, smartsensor, smartshunt, smarttel and total endurance are trademarks of microchip technology incorporated in the u.s.a. and other countries. serialized quick turn programming (sqtp) is a service mark of microchip technology incorporated in the u.s.a. all other trademarks mentioned herein are property of their respective companies. ? 2003, 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 contained in their particular microchip data sheet. ? microchip believes that its family of products is one of the most 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 methods used to breach the code protection feature. all of these methods, to our knowledge, require using the microchip products in a manner outside the operating specifications 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 semiconductor 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 code protection feature may be a violation of the digital millennium copyright act. if such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that act. microchip received qs-9000 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in chandler and tempe, arizona in july 1999 and mountain view, california in march 2002. the company?s quality system processes and procedures are qs-9000 compliant for its picmicro ? 8-bit mcus, k ee l oq ? code hopping devices, serial eeproms, microperipherals, non-volatile memory and analog products. in addition, microchip?s quality system for the design and manufacture of development systems is iso 9001 certified.
ds21384c-page 12 ? 2003 microchip technology inc. m americas corporate office 2355 west chandler blvd. chandler, az 85224-6199 tel: 480-792-7200 fax: 480-792-7277 technical support: 480-792-7627 web address: http://www.microchip.com atlanta 3780 mansell road, suite 130 alpharetta, ga 30022 tel: 770-640-0034 fax: 770-640-0307 boston 2 lan drive, suite 120 westford, ma 01886 tel: 978-692-3848 fax: 978-692-3821 chicago 333 pierce road, suite 180 itasca, il 60143 tel: 630-285-0071 fax: 630-285-0075 dallas 4570 westgrove drive, suite 160 addison, tx 75001 tel: 972-818-7423 fax: 972-818-2924 detroit tri-atria office building 32255 northwestern highway, suite 190 farmington hills, mi 48334 tel: 248-538-2250 fax: 248-538-2260 kokomo 2767 s. albright road kokomo, in 46902 tel: 765-864-8360 fax: 765-864-8387 los angeles 18201 von karman, suite 1090 irvine, ca 92612 tel: 949-263-1888 fax: 949-263-1338 phoenix 2355 west chandler blvd. chandler, az 85224-6199 tel: 480-792-7966 fax: 480-792-4338 san jose 2107 north first street, suite 590 san jose, ca 95131 tel: 408-436-7950 fax: 408-436-7955 toronto 6285 northam drive, suite 108 mississauga, ontario l4v 1x5, canada tel: 905-673-0699 fax: 905-673-6509 asia/pacific australia suite 22, 41 rawson street epping 2121, nsw australia tel: 61-2-9868-6733 fax: 61-2-9868-6755 china - beijing unit 915 bei hai wan tai bldg. no. 6 chaoyangmen beidajie beijing, 100027, no. china tel: 86-10-85282100 fax: 86-10-85282104 china - chengdu rm. 2401-2402, 24th floor, ming xing financial tower no. 88 tidu street chengdu 610016, china tel: 86-28-86766200 fax: 86-28-86766599 china - fuzhou unit 28f, world trade plaza no. 71 wusi road fuzhou 350001, china tel: 86-591-7503506 fax: 86-591-7503521 china - hong kong sar unit 901-6, tower 2, metroplaza 223 hing fong road kwai fong, n.t., hong kong tel: 852-2401-1200 fax: 852-2401-3431 china - shanghai room 701, bldg. b far east international plaza no. 317 xian xia road shanghai, 200051 tel: 86-21-6275-5700 fax: 86-21-6275-5060 china - shenzhen rm. 1812, 18/f, building a, united plaza no. 5022 binhe road, futian district shenzhen 518033, china tel: 86-755-82901380 fax: 86-755-8295-1393 china - shunde room 401, hongjian building no. 2 fengxiangnan road, ronggui town shunde city, guangdong 528303, china tel: 86-765-8395507 fax: 86-765-8395571 china - qingdao rm. b505a, fullhope plaza, no. 12 hong kong central rd. qingdao 266071, china tel: 86-532-5027355 fax: 86-532-5027205 india divyasree chambers 1 floor, wing a (a3/a4) no. 11, o?shaugnessey road bangalore, 560 025, india tel: 91-80-2290061 fax: 91-80-2290062 japan benex s-1 6f 3-18-20, shinyokohama kohoku-ku, yokohama-shi kanagawa, 222-0033, japan tel: 81-45-471- 6166 fax: 81-45-471-6122 korea 168-1, youngbo bldg. 3 floor samsung-dong, kangnam-ku seoul, korea 135-882 tel: 82-2-554-7200 fax: 82-2-558-5932 or 82-2-558-5934 singapore 200 middle road #07-02 prime centre singapore, 188980 tel: 65-6334-8870 fax: 65-6334-8850 taiwan kaohsiung branch 30f - 1 no. 8 min chuan 2nd road kaohsiung 806, taiwan tel: 886-7-536-4818 fax: 886-7-536-4803 taiwan taiwan branch 11f-3, no. 207 tung hua north road taipei, 105, taiwan tel: 886-2-2717-7175 fax: 886-2-2545-0139 europe austria durisolstrasse 2 a-4600 wels austria tel: 43-7242-2244-399 fax: 43-7242-2244-393 denmark regus business centre lautrup hoj 1-3 ballerup dk-2750 denmark tel: 45-4420-9895 fax: 45-4420-9910 france parc d?activite du moulin de massy 43 rue du saule trapu batiment a - ler etage 91300 massy, france tel: 33-1-69-53-63-20 fax: 33-1-69-30-90-79 germany steinheilstrasse 10 d-85737 ismaning, germany tel: 49-89-627-144-0 fax: 49-89-627-144-44 italy via quasimodo, 12 20025 legnano (mi) milan, italy tel: 39-0331-742611 fax: 39-0331-466781 netherlands p. a. de biesbosch 14 nl-5152 sc drunen, netherlands tel: 31-416-690399 fax: 31-416-690340 united kingdom 505 eskdale road winnersh triangle wokingham berkshire, england rg41 5tu tel: 44-118-921-5869 fax: 44-118-921-5820 07/28/03 w orldwide s ales and s ervice

▲Up To Search▲

Price & Availability of TC1278

	To Download TC1278 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .