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this is information on a product in full production. march 2014 docid014134 rev 8 1/25 stwd100 watchdog timer circuit datasheet - production data features ? current consumption 13 a typ. ? available watchdog timeout periods are 3.4 ms, 6.3 ms, 102 ms and 1.6 s ? chip enable input ? open drain or push-pull wdo output ? operating temperature range: ?40 to +125 c ? package sot23-5, sc70-5 (sot323-5) ? esd performance ? hbm: 2000 v ? rcdm: 1000 v applications ? telecommunications ? alarm systems ? industrial equipment ? networking ? medical equipment ? ups (uninterruptible power supply) table 1. device summary sot23-5 (wy) sc70-5, sot323-5 (w8) order code temperature range package packing topside marking stwd100nwwy3f -40/+125 c sot23-5l tape and reel wnw stwd100ynwwy3f (1) -40/+125 c sot23-5l (automotive grade) tape and reel wynw stwd100nywy3f -40/+125 c sot23-5l tape and reel wny stwd100ynywy3f (1) 1. qualification and characterization according to aec q100 and q003 or equivalent, advanced screening according to aec q001 and q002 or equivalent -40/+125 c sot23-5l (automotive grade) tape and reel wyny STWD100NPWY3F -40/+125 c sot23-5l tape and reel wnp stwd100ynpwy3f (1) -40/+125 c sot23-5l (automotive grade) tape and reel wynp stwd100pyw83f -40/+125 c sot323-5l tape and reel wpy www.st.com
contents stwd100 2/25 docid014134 rev 8 contents 1 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 watchdog input (wdi) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 watchdog output ( wdo) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 chip enable input ( en) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.4 applications information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3 watchdog timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 4 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5 dc and ac parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 7 part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 8 package marking information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 9 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
docid014134 rev 8 3/25 stwd100 list of tables 25 list of tables table 1. device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 table 2. sot23-5 and sc70-5 (sot323-5) pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 table 3. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 table 4. operating and ac measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 table 5. dc and ac characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 table 6. sot23-5 - 5-lead small outline transistor package mechanical data . . . . . . . . . . . . . . . . . 19 table 7. sc70 (sot323-5) ? 5-lead small outline transistor package mechanical data . . . . . . . . . 21 table 8. ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22 table 9. device versions with marking descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 table 10. document revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
list of figures stwd100 4/25 docid014134 rev 8 list of figures figure 1. sot23-5 and sc70-5 (sot323-5) package connections . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 2. logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 3. block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 4. open drain wdo output connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 5. interfacing to microprocessors with bidirectional reset i/o . . . . . . . . . . . . . . . . . . . . . . . . . . 9 figure 6. power-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 7. normal triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 8. timeout without re-trigger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 9. trigger after timeout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 10. enable pin, en, triggering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 figure 11. sot23-5 - 5-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . . . 19 figure 12. sc70 (sot323-5) - 5-lead small outline transistor package outline. . . . . . . . . . . . . . . . . . 20
docid014134 rev 8 5/25 stwd100 description 25 1 description the stwd100 watchdog timer circuits are self-contained devices which prevent system failures that are caused by certain types of hardware errors (non-responding peripherals, bus contention, etc.) or software errors (bad code jump, code stuck in loop, etc.). the stwd100 watchdog timer has an input, wdi, and an output, wdo. the input is used to clear the internal watchdog timer periodically within the specified timeout period, t wd . while the system is operating correctly, it periodically toggles the watchdog input, wdi. if the system fails, the watchdog timer is not reset, a system alert is generated and the watchdog output, wdo, is asserted. the stwd100 circuit also has an enable pin, en, which can enable or disable the watchdog functionality. the en pin is connected to the internal pull-down resistor. the device is enabled if the en pin is left floating. figure 1. sot23-5 and sc70-5 (sot323-5) package connections 1 v cc gnd wdo en ai12639b 2 3 5 4 wdi table 2. sot23-5 and sc70-5 (sot323-5) pin description pin number name description 1 wdo watchdog output 2 gnd ground 3 en enable pin 4 wdi watchdog input 5v cc supply voltage
description stwd100 6/25 docid014134 rev 8 figure 2. logic diagram note: wdo output is available in open drain or push-pull configuration. figure 3. block diagram note: positive pulse on enable pin en longer than 1 s resets the watchdog timer. ai12640a v cc stwd100 gnd wdo wdi en $,9 :', :'2 :', wudqvlwlrqdo ghwhfwru :dwfkgrj wlphu 67:'[3rqo\ (1 *1' 2xwsxw wlplqj &/5
docid014134 rev 8 7/25 stwd100 operation 25 2 operation the stwd100 device is used to detect an out-of-control mcu. the user has to ensure watchdog reset within the watchdog timeout period, otherwise the watchdog output is asserted and mcu is restarted. the stwd100 can be also enabled or disabled by the chip enable pin. 2.1 watchdog input (wdi) the wdi input has to be toggled within the watchdog timeout period, t wd , otherwise the watchdog output, wdo, is asserted. the internal watchdog timer, which counts the t wd period, is cleared either: 1. by a transition on watchdog output, wdo (see figure 8 on page 12 ) or 2. by a pulse on enable pin, en (see figure 10 on page 14 ) or 3. by toggling wdi input (low-to-high on all versions and high-to-low on stwd100xw, stwd100xx and stwd100xy only). the pulses on wdi input with a duration of at least 1 s are detected and glitches shorter than 100 ns are ignored. if wdi is permanently tied high or low and en is tied low, the wdo toggles every 3.4 ms (t wd ) on stwd100xp and every t wd and t pw on stwd100xw, stwd100xx and stwd100xy (see figure 8 on page 12 ). 2.2 watchdog output ( wdo) when the v cc exceeds the timer startup voltage v start after power-up, the internal watchdog timer starts counting. if the timer is not cleared within the t wd , the wdo will go low (see figure 6 ). after exceeding the t wd , the wdo is asserted for t pw on stwd100xw, stwd100xx and stwd100xy regardless of possible wdi transitions (see figure 9 on page 13 ). on stwd100xp wdo is asserted for a minimum of 10 s and a maximum of t wd after exceeding the t wd period (see figure 8 on page 12 and figure 9 on page 13 ). the stwd100 has an active low open drain or push-pull output. an external pull-up resistor connected to any supply voltage up to 6 v is required in case of open drain wdo output (see figure 4 ). select a resistor value large enough to register a logic low, and small enough to register a logic high while supplying all input current and leakage paths connected to the reset output line. a 10 k ? pull-up resistor is sufficient in most applications.
operation stwd100 8/25 docid014134 rev 8 figure 4. open drain wdo output connection 2.3 chip enable input ( en) all states mentioned in section 2.1: watchdog input (wdi) and section 2.2: watchdog output (wdo) are valid under the condition that en is in logical low state. the behavior of en is common to all versions (i.e. stwd100xp, stwd100xw, stwd100xx and stwd100xy). if the en goes high after power-up in less than t wd from the moment that v cc exceeds the timer startup voltage, v start , the wdo will stay high for the same time period as en, plus t wd (see figure 10 on page 14 ). if the en goes high anytime during normal operation, the wdo will go high as well, but the minimum possible wdo pulse width is 10 s (see figure 10 on page 14 ). the pulses on the en pin with a duration of at least 1 s are detected and glitches shorter than 100 ns are ignored. 2.4 applications information interfacing to microprocessors with bidirectional reset pins microprocessors with bidirectional reset pins can contend with the stwd100 watchdog output, wdo. for example, if the wdo output is driven high and the micro wants to pull it low, signal contention will result. to prevent this from occurring, connect a 4.7 k ? resistor between the wdo output and the microprocessors reset i/o as in figure 5 . 9 && *1' :', (1 9 *1' $,9 9 9v\vwhp :'2 67:'
docid014134 rev 8 9/25 stwd100 operation 25 figure 5. interfacing to microprocessors with bidirectional reset i/o $,9 :'2 67:' *1' *1' 567 9 && 9 && %xiihuhguhvhwwrrwkhu v\vwhpfrpsrqhqwv 0lfursurfhvvru
watchdog timing stwd100 10/25 docid014134 rev 8 3 watchdog timing figure 6. power-up ; ; $,9 3rzhuxszdwfkgrjwlphuvwduwvuxqqlqjdvvrrqdv9 && ulvhvderyha9 3rzhuxs zdwfkgrjwlphuvwduwvuxqqlqjdvvrrqdv9 && ulvhvderyha9 $wsrzhuxs:',lvdgrq
wfduh,wfdqehru &dqdovrwudqvlwlrqiurpkljkwrorz %xwqrlqsxwwudqvlwlrqlvuhtxluhgwrehjlqwlplqj $wsrzhuxs:',lvdgrq
wfduh,wfdqehru %xwqrlqsxwwudqvlwlrqlvuhtxluhgwrehjlqwlplqj a9 a9 9 && 9 && :', :', :'2 :'2 (1 (1 ;lhruexwqrwiordwlqj ;lhruexwqrwiordwlqj w :' w :'
docid014134 rev 8 11/25 stwd100 watchdog timing 25 figure 7. normal triggering x x < stwd100xp stwd100xw, stwd100xx, stwd100xy ai12663 trigger only on rising edge. falling edge is ignored. trigger on rising and falling edge of wdi. v cc v cc wdi wdi wdo wdo en en t wd t wd t wd
watchdog timing stwd100 12/25 docid014134 rev 8 figure 8. timeout without re-trigger x x stwd100xp stwd100xw, stwd100xx, stwd100xy ai12664 after a timeout and wdo is asserted, it will stay low for t pw time period, then return high. if no wdi trigger event occurs within t wd time period, wdo will again assert low. this cycle repeats until a wdi trigger event occurs while wdo is high. after a timeout and wdo is asserted, it will stay low for t wd time period, then return high. if no wdi trigger event occurs, wdo will again assert low after t wd time period. this cycle repeats until a wdi trigger event occurs. v cc v cc wdi wdi wdo wdo en en t wd t wd t wd t wd t wd t wd t wd t wd t wd t wd t pw t pw t pw
docid014134 rev 8 13/25 stwd100 watchdog timing 25 figure 9. trigger after timeout >10 s min. x x stwd100xp stwd100xw, stwd100xx, stwd100xy ai12665 if a wdi trigger occurs after the wdo output has asserted, it is ignored, and the output remains asserted for the specified time, t pw . if a wdi trigger occurs after the wdo output has asserted, the output will de-assert, but with a pulse width of at least 10 s (min) . v cc v cc wdi wdi wdo wdo en en trigger ignored while wdo is low. t pw t wd
watchdog timing stwd100 14/25 docid014134 rev 8 figure 10. enable pin, en, triggering x disabled x disabled stwd100xx stwd100xx ai12666 whenever en is high, all timing is reset, and the part is disabled. timing commences from 0 when en goes low. if en goes high while wdo is asserted, wdo will de-assert but only after the nominal minimum pulse width of 10 s has elapsed. v cc v cc wdi wdi wdo wdo en en ~ 2.2 v x (ie, 1 or 0 but not floating) >10 s min. x (ie, 1 or 0 but not floating) < t wd t wd t wd t wd
docid014134 rev 8 15/25 stwd100 maximum ratings 25 4 maximum ratings stressing the device above the rating listed in table 3 may cause permanent damage to the device. these are stress ratings only and operation of the device at these or any other conditions above those indicated in table 4 of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. refer also to the stmicroelectronics sure program and other relevant quality documents. table 3. absolute maximum ratings symbol parameter value unit t stg storage temperature (v cc off) ?55 to 150 c t sld (1) 1. reflow at peak temperature of 260 c (total thermal budget not to exceed 245 c for greater than 30 seconds). lead solder temperature for 10 seconds 260 c v io input or output voltage ?0.3 to v cc +0.3 v v cc supply voltage ?0.3 to 7.0 v i o output current 20 ma p d power dissipation 320 mw
dc and ac parameters stwd100 16/25 docid014134 rev 8 5 dc and ac parameters this section summarizes the operating measurement conditions, and the dc and ac characteristics of the device. the parameters in table 5 that follows, are derived from tests performed under the measurement conditions summarized in table 4 . designers should check that the operating conditions in their circuit match the operating conditions when relying on the quoted parameters. table 4. operating and ac measurement conditions parameter value unit v cc supply voltage 2.7 to 5.5 v ambient operating temperature (t a ) ?40 to 125 c input rise and fall times ? 5ns input pulse voltages 0.2 to 0.8 v cc v input and output timing ref. voltages 0.3 to 0.7 v cc v
docid014134 rev 8 17/25 stwd100 dc and ac parameters 25 table 5. dc and ac characteristics symbol description test condition (1) min. typ. max. unit v cc operating voltage 2.7 5 5.5 v i cc v cc supply current 13 26 a i lo open drain output leakage current from output to the gnd or v cc ?1 +1 a input leakage current (wdi) ?1 +1 a v ih input high voltage (wdi, en) 0.7 v cc v v il input low voltage (wdi, en) 0.3 v cc v v ol output low voltage ( wdo) v cc ?? 2.7 v, i sink = 1.2 ma 0.3 v v cc ?? 4.5 v, i sink = 3.2 ma 0.4 v v oh output high voltage ( wdo) (push-pull only) v cc ?? 2.7 v, i source = 500 a 0.8 v cc v v cc ?? 4.5 v, i source = 800 a 0.8 v cc v enable pin ( en) en input pulse width 1 s en glitch rejection 100 ns en-to- wdo delay (2) 200 ns en pull-down resistance 32 63 100 k ? watchdog timer v start timer startup voltage 1.9 2.2 2.7 v t wd watchdog timeout period stwd100xp 2.3 3.4 4.6 ms stwd100xw 4.3 6.3 8.6 ms stwd100yxw 5.1 6.3 8.6 ms stwd100xx 71 102 142 ms stwd100xy 1.12 1.6 2.24 s t pw watchdog active time 140 210 280 ms wdi-to- wdo delay (3) 150 ns wdi pulse width 1 s wdi glitch rejection 100 ns 1. valid for ambient operating temperature: t a = ?40 to 125 c; v cc = 2.7 v to 5.5 v except where noted. 2. wdo will assert for minimum of 10 s even if en transitions high. 3. wdo will assert for minimum of 10 s regardless of transition on wdi (valid for stwd100xp only).
package information stwd100 18/25 docid014134 rev 8 6 package information in order to meet environmental requirements, st offers these devices in different grades of ecopack ? packages, depending on their level of environmental compliance. ecopack specifications, grade definitions and product status are available at: www .st.com . ecopack is an st trademark. the maximum ratings related to soldering conditions are also marked on the inner box label.
docid014134 rev 8 19/25 stwd100 package information 25 figure 11. sot23-5 - 5-lead small outline transistor package outline table 6. sot23-5 - 5-lead small outline transistor package mechanical data symbol dimensions mm inches typ. min. max. typ. min. max. a 1.20 0.90 1.45 0.047 0.035 0.057 a1 0.15 0.006 a2 1.05 0.90 1.30 0.041 0.035 0.051 b 0.40 0.35 0.50 0.016 0.014 0.020 c 0.15 0.09 0.20 0.006 0.004 0.008 d 2.90 2.80 3.00 0.114 0.110 0.118 d1 1.90 0.075 e 2.80 2.60 3.00 0.110 0.102 0.118 e 0.95 0.037 f 1.60 1.50 1.75 0.063 0.059 0.069 k 0 10 0 10 l 0.35 0.10 0.60 0.014 0.004 0.024
package information stwd100 20/25 docid014134 rev 8 figure 12. sc70 (sot323-5) - 5-lead small outline transistor package outline sc70(sot323-5)
docid014134 rev 8 21/25 stwd100 package information 25 table 7. sc70 (sot323-5) ? 5-lead small outline transistor package mechanical data symbol dimensions mm inches typ. min. max. typ. min. max. a 0.80 1.10 0.031 0.043 a1 0.00 0.10 0.000 0.004 a2 0.90 0.80 1.00 0.035 0.031 0.039 b 0.15 0.30 0.006 0.012 c 0.10 0.22 0.004 0.009 d 2.00 1.80 2.20 0.079 0.071 0.087 e 2.10 1.80 2.40 0.083 0.071 0.094 e1 1.25 1.15 1.35 0.049 0.045 0.053 e 0.65 0.026 e1 1.30 0.051 l 0.36 0.26 0.46 0.014 0.010 0.018 < ? 0 8 ? 0 8 n5 5
part numbering stwd100 22/25 docid014134 rev 8 7 part numbering table 8. ordering information scheme note: please check device version availability on www .st.com . please contact local st sales office for new device version request. example: stwd100 y n p wy 3 f device type stwd100 device grade y: automotive grade output type n: open drain (active low) p: push-pull (active low) device version p: t wd = 3.4 ms, t pw = t wd = 3.4 ms w: t wd = 6.3 ms, t pw = 210 ms x: t wd = 102 ms, t pw = 210 ms y: t wd = 1.6 s, t pw = 210 ms package wy: sot23-5 w8: sc70-5 (sot323-5) temperature range 3: ?40 to +125 c shipping method f: ecopack ? package, tape and reel
docid014134 rev 8 23/25 stwd100 package marking information 25 8 package marking information table 9. device versions with marking descriptions part number watchdog timing period output configuration topside marking bottomside marking (1) t wd t pw stwd100npxxxx 3.4 ms 3.4 ms open drain wnp pyww stwd100nwxxxx 6.3 ms 210 ms open drain wnw pyww stwd100nxxxxx 102 ms 210 ms open drain wnx pyww stwd100nyxxxx 1.6 s 210 ms open drain wny pyww stwd100pwxxxx 6.3 ms 210 ms push-pull wpw pyww stwd100pxxxxx 102 ms 210 ms push-pull wpx pyww stwd100pyxxxx 1.6 s 210 ms push-pull wpy pyww 1. description: p = assembly plant code, y = assembly year (0 to 9), ww = assembly work week (01 to 52).
revision history stwd100 24/25 docid014134 rev 8 9 revision history table 10. document revision history date revision changes 08-nov-2007 1 initial release. 23-jan-2008 2 updated cover page and table 5 ; document status upgraded to full datasheet. 28-jan-2008 3 updated cover page. 17-mar-2008 4 updated cover page, figure 4 , 7 , 9 , and table 5 , 9 . 31-jul-2008 5 updated features on cover page and table 5 . 05-mar-2012 6 added product maturity information and section applications , updated section 1 , section 2.4 , section 4 , section 5 , section 7 and section 8 , ecopack ? text, minor text corrections throughout document. 26-oct-2012 7 updated features (added esd information). added table 1: device summary . updated table 8 (added automotive grade version to the device type). minor corrections throughout document. 11-mar-2014 8 updated table 1: device summary and table 8: ordering information scheme added stwd100yxw and values to t wd in table 5: dc and ac characteristics
docid014134 rev 8 25/25 stwd100 25 please read carefully: information in this document is provided solely in connection with st products. stmicroelectronics nv and its subsidiaries (?st ?) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described he rein at any time, without notice. a ll st products are sold pursuant to st?s terms and conditions of sale. purchasers are solely responsible for the choice, selection and use of the st products and services described herein, and st as sumes no liability whatsoever relating to the choice, selection or use of the st products and services described herein. no license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. i f any part of this document refers to any third party products or services it shall not be deemed a license grant by st for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoev er of such third party products or services or any intellectual property contained therein. unless otherwise set forth in st?s terms and conditions of sale st disclaims any express or implied warranty with respect to the use and/or sale of st products including without limitation implied warranties of merchantability, fitness for a particular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. st products are not designed or authorized for use in: (a) safety critical applications such as life supporting, active implanted devices or systems with product functional safety requirements; (b) aeronautic applications; (c) automotive applications or environments, and/or (d) aerospace applications or environments. where st products are not designed for such use, the purchaser shall use products at purchaser?s sole risk, even if st has been informed in writing of such usage, unless a product is expressly designated by st as being intended for ?automotive, automotive safety or medical? industr y domains according to st product design specifications. products formally escc, qml or jan qualified are deemed suitable for use in aerospace by the corresponding governmental agency. resale of st products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by st for the st product or service described herein and shall not create or extend in any manner whatsoev er, any liability of st. st and the st logo are trademarks or registered trademarks of st in various countries. information in this document supersedes and replaces all information previously supplied. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners. ? 2014 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - philippines - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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