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ltc1726 1 1726fd for more information www.linear.com/ltc1726 typical a pplica t ion fea t ures descrip t ion triple supply monitor and p supervisor with adjustable reset and watchdog timer the lt c ? 1726 is a triple supply monitor and microproces- sor supervisory circuit with adjustable reset and watchdog functions intended for systems with multiple supply volt- ages. the part has a common open-drain reset output with an adjustable delay. the reset and watchdog time-out periods are both adjustable using external capacitors. tight 1.5% accuracy specifications and glitch immunity ensure reliable reset operation without false triggering. the rst output is guaranteed to be in the correct state for v cc5 /v cc25 or v cc3 down to 1 v. the ltc1726 may also be configured to monitor any one or two v cc inputs instead of three, depending on system requirements. the low (16 a typical) supply current makes the ltc1726 ideal for power-conscious systems. l, lt , lt c , lt m , linear technology and the linear logo are registered trademarks and thinsot is a trademark of linear technology corporation. all other trademarks are the property of their respective owners. a pplica t ions n monitors three inputs simultaneously ltc1726-5: 5v, 3.3v and adj ltc1726-2.5: 2.5v, 3.3v and adj n 1.5% threshold accuracy over t emperature n low supply current: 16a typ n adjustable reset timeout n adjustable watchdog timeout n active low open-drain reset output n power supply glitch immunity n guaranteed reset for v cc3 1v or v cc25 /v cc5 1v n ms8 and so-8 packages n desktop computers n notebook computers n intelligent instruments n portable battery-powered equipment n network servers a 3.3v, 5v and 1.8v monitor a 3.3v, 2.5v and 1.8v monitor v cc5 rt c rt 47nf c wt 47nf 2 1 4 3 6 r1 66.5k 1% t rt = 155ms t wt = 1s r2 100k 1% 5 8 0.1f 7 1726 ta01 ltc1726-5 wt rst wdi v cc3 5v 3.3v 1.8v (v trip = 1.665v) gnd v cca p reset i/o 0.1f v cc25 rt c rt 47nf c wt 47nf 2 1 4 3 6 t rt = 155ms t wt = 1s r2 100k 1% 5 8 0.1f 7 1726 ta02 ltc1726-2.5 wt rst wdi v cc3 2.5v 3.3v 1.8v (v trip = 1.665v) gnd v cca p reset i/o 0.1f r1 66.5k 1%
ltc1726 2 1726fd for more information www.linear.com/ltc1726 a bsolu t e maxi m u m r a t ings terminal voltage v cc 3 , v cc 5 /v cc 25 , v cca ........................... C0. 3 v to 7v rst .......................................................... C 0.3 v to 7v wdi ......................................................... C0. 3 v to 7v rt, wt ..................................................... C 0.3 v to 7v (notes 1, 2) 1 2 3 4 v cc3 v cc25 /v cc5 v cca gnd 8 7 6 5 rt wt rst wdi top view ms8 package 8-lead plastic msop t jmax = 125c, ja = 200c/w 1 2 3 4 8 7 6 5 top view rt wt rst wdi v cc3 v cca gnd s8 package 8-lead plastic so v cc25 /v cc5 t jmax = 125c, ja = 150c/w p in c on f igura t ion o r d er i n f or m a t ion lead free finish tape and reel part marking package description temperature range ltc1726ems8-2.5#pbf ltc1726ems8-2.5#trpbf ltkz 8-lead plastic msop C40c to 85c ltc1726ems8-5#pbf ltc1726ems8-5#trpbf ltla 8-lead plastic msop C40c to 85c ltc1726hms8-5#pbf ltc1726hms8-5#trpbf ltla 8-lead plastic msop C40c to 125c ltc1726es8-2.5#pbf ltc1726es8-2.5#trpbf 172625 8-lead plastic so C40c to 85c ltc1726es8-5#pbf ltc1726es8-5#trpbf 17265 8-lead plastic so C40c to 85c ltc1726is8-2.5#pbf ltc1726is8-2.5#trpbf 726i25 8-lead plastic so C40c to 85c ltc1726is8-5#pbf ltc1726is8-5#trpbf 1726i5 8-lead plastic so C40c to 85c consult lt c marketing for parts specified with wider operating temperature ranges. consult lt c marketing for information on non-standard lead based finish parts. for more information on lead free part marking, go to: http://www.linear.com/leadfree/ for more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ operating temperature range ( note 3) ltc 1726 e, ltc 1726 i ............................ C 40 c to 85 c ltc 1726 h .......................................... C 40 c to 125 c storage temperature range .................. C 65 c to 150 c lead temperature ( soldering , 10 sec ) ................... 30 0 c
ltc1726 3 1726fd for more information www.linear.com/ltc1726 the l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at t a = 25c . v cc3 = 3.3v , v cc5 = 5v , v cc25 = 2.5v , v cca = v cc3 unless otherwise noted. e lec t rical c harac t eris t ics symbol parameter conditions min typ max units v rt 3 reset threshold v cc3 v cc3 input threshold h-grade l l 3.036 3.023 3.085 3.085 3.135 3.147 v v v rt 5 reset threshold v cc5 v cc5 input threshold (5v version) h-grade l l 4.600 4.582 4.675 4.675 4.750 4.769 v v v rt 25 reset threshold v cc25 v cc25 input threshold (2.5v version), l 2.300 2.337 2.375 v v rta reset threshold v cca v cca input threshold h-grade l l 0.985 0.978 1.000 1.000 1.015 1.022 v v v cc v cc3 or v cc5 operating voltage rst in correct logic state l 1 7 v i vcc3 v cc3 supply current v cc5 /v cc25 > v cc3 v cc5 /v cc25 < v cc3 , v cc3 = 3.3v l l 1 16 2 30 a a i vcc5 v cc5 supply current v cc5 = 5v l 16 30 a i vcc25 v cc25 supply current v cc25 < v cc3 , v cc25 = 2.5v (note 4) l 1 2 a i vcca v cca input current v cca = 1v l C15 0 15 na rt charge current out v rt = 0v h-grade l l 1.4 1.3 2 2 2.6 2.6 a a wt charge current out v wt = 0v h-grade l l 1.4 1.3 2 2 2.6 2.6 a a rt discharge current out v rt = 1.3v h-grade l l 14 13 20 20 26 28 a a wt discharge current out v wt = 1.3v h-grade l l 14 13 20 20 26 28 a a ?t rt reset time-out period variation c rt = 1500pf deviation from t rt = 5ms (note 5) h-grade l l C30 C45 0 0 30 45 % % t uv v cc undervoltage detect to rst v cc25 /v cc5 , v cc3 or v cca less than reset threshold v rt by more than 1% 130 s v oh rst output voltage high (note 6) i source = 1a l v cc3 C 1 v v ol rst output voltage low i sink = 2.5ma, v cc5 /v cc25 = 0v i sink = 100a, v cc3 = 1v, v cc5 /v cc25 = 0v i sink = 100a, v cc3 = 0v, v cc5 /v cc25 = 1v i sink = 100a, v cc3 = 1v, v cc5 /v cc25 = 1v l l l l 0.15 0.05 0.05 0.05 0.4 0.3 0.3 0.3 v v v v v ih wdi input threshold high l 0.7 ? v cc3 v v il wdi input threshold low l 0.3 ? v cc3 v t wp wdi pulse width l 40 ns ?t wt watchdog time-out period variation c wt = 1500pf deviation from t wt = 33ms (note 5) h-grade l l C30 C45 0 0 30 45 % % wdi leakage current l 1 a ltc1726-5 only v ovr v cc5 reset override voltage (note 7) override v cc5 ability to assert rst v cc3 0.025 v
ltc1726 4 1726fd for more information www.linear.com/ltc1726 typical p er f or m ance c harac t eris t ics v cc25 threshold voltage vs temperature (ltc1726-2.5) i vcc5 vs temperature ( ltc1726-5) i vcc3 vs temperature (ltc1726-5) v cc5 threshold voltage vs temperature (ltc1726-5) v cc3 threshold voltage vs temperature v cca threshold voltage vs temperature temperature (c) ?60 4.600 v cc5 threshold voltage, v rt5 (v) 4.625 4.650 4.675 4.700 ?20 20 60 100 1726 g01 4.725 4.750 ?40 0 40 80 temperature (c) ?60 v cc25 threshold voltage, v rt25 (v) 0 40 100 1726 g04 2.300 2.315 2.330 2.345 2.360 2.375 ?40 ?20 20 60 80 temperature (c) ? 60 3.035 v cc3 threshold voltage, v rt3 (v) 3.045 3.065 3.075 3.085 3.135 3.105 ? 20 20 40 1726 g02 3.055 3.115 3.125 3.095 ?40 0 60 80 100 temperature (c) ?60 10 i vcc5 (a) 11 13 14 15 20 17 ?20 20 40 1726 g05 12 18 19 16 ?40 0 60 80 100 v cc5 = 5v v cc3 = 3.3v temperature (c) ?60 v cca threshold voltage, v rta (v) 1.000 1.005 1.015 1.010 0 40 100 1726 g03 0.995 0.990 0.985 ?40 ?20 20 60 80 temperature (c) ?60 0.5 i vcc3 (a) 0.6 0.8 0.9 1.0 1.5 1.2 ?20 20 40 1726 g06 0.7 1.3 1.4 1.1 ?40 0 60 80 100 v cc5 = 5v v cc3 = 3.3v note 1: stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. exposure to any absolute maximum rating condition for extended periods may affect device reliability and lifetime. note 2: all voltage values are with respect to gnd. note 3: the ltc1726e is guaranteed to meet performance specifications from 0c to 70c. specifications over the C40c to 85c operating temperature range are assured by design, characterization and correlation with statistical process controls. note 4: both v cc3 and v cc25 /v cc5 can act as the supply depending on which pin has the greatest potential. note 5: timing measured with respect to rst passing through 1.5v. note 6: the output pin rst has a weak internal pull-up to v cc3 of typically 6a. however, external pull-up resistors may be used when faster rise times are required or for v oh voltages greater than v cc3 . note 7: the v cc5 reset override voltage is valid for an operating range less than approximately 4.15v. above this point the override is turned off and the v cc5 pin functions normally. e lec t rical c harac t eris t ics
ltc1726 5 1726fd for more information www.linear.com/ltc1726 typical p er f or m ance c harac t eris t ics watchdog time-out period vs capacitance reset time-out period vs capacitance rst output voltage vs supply voltage (ltc1726-2.5) v cca input current vs input voltage watchdog time-out period vs temperature reset pulse width vs temperature i vcc25 vs temperature (ltc1726-2.5) i vcc3 vs temperature (ltc1726-2.5) typical transient duration vs comparator overdrive temperature (c) ?60 0.5 i vcc25 (a) 0.6 0.8 0.9 1.0 1.5 1.2 ?20 20 40 1726 g07 0.7 1.3 1.4 1.1 ?40 0 60 80 100 v cc3 = 3.3v v cc25 = 2.5v temperature (c) ?60 10 i vcc3 (a) 11 13 14 15 20 17 ?20 20 40 1726 g08 12 18 19 16 ?40 0 60 80 100 v cc3 = 3.3v v cc25 = 2.5v reset comparator overdrive voltage (% of v cc ) 0.1 400 typical transient duration (s) 500 600 700 1 10 100 1726 g09 300 200 100 0 reset occurs above curve t a = 25c temperature (c) ?60 ?40 watchdog time period, t wt (ms) 34 36 38 60 80 1726 g10 32 30 ?20 0 20 40 100 28 26 40 c wt = 1500pf (silver mica) input voltage (v) 0.80 0.85 0.95 1.05 1.15 input current (na) 0 1.0 1.20 1726 g14 ?1.0 ? 2.0 ? 0.5 ?1.5 0.90 1 1.10 2.0 0.5 1.5 t a = 25c temperature (c) ?60 4.0 reset pulse width, t rt (ms) 4.2 4.6 4.8 5.0 6.0 5.4 ?20 20 40 1726 g11 4.4 5.6 5.8 5.2 ?40 0 60 80 100 c rt = 1500pf (silver mica) v cc3 (v) 0 2 1726 f13 1 1 2 3 0 3 rst output voltage (v) v cc3 = v cc25 = v cca 10k pull-up from v cc3 to rst t a = 25c c wt (farad) 10p1p 100p 10n 1 1000 100 10 1 100m 10m 1m 100 1726 g12 1n 100n 10 watchdog time-out period, t wt (sec) t a = 25c c rt (farad) 10p1p 100p 10n 1 100 10 1 100m 10m 1m 100 10 1726 g15 1n 100n 10 reset time-out period, t rt (sec) t a = 25c
ltc1726 6 1726fd for more information www.linear.com/ltc1726 p in func t ions v cc3 (pin 1): 3.3 v sense input. this pin also supplies power to the part when the voltage on this pin is greater than the voltage on v cc25 /v cc5 . bypass this pin to ground with a 0.1f or larger ceramic capacitor. v cc5 (pin 2): 5 v sense input ( ltc1726-5). this pin also supplies power to the part when the voltage on this pin is greater than the voltage on v cc3 . bypass this pin to ground with a 0.1f or larger ceramic capacitor. v cc25 (pin 2): 2.5 v sense input ( ltc1726-2.5). this pin also supplies power to the part when the voltage on this pin is greater than the voltage on v cc3 . bypass this pin to ground with a 0.1f or larger ceramic capacitor. v cca (pin 3): 1 v sense, high impedance input. if unused it can be tied to either v cc3 , v cc5 or v cc25 . gnd (pin 4): ground. wdi (pin 5): watchdog input. a logic input whose rising or falling edge must occur on this pin within the selected watchdog time-out period or a reset pulse will occur. the watchdog time-out period is set by the value of the capacitor that is placed on the wt pin. the rising or falling edge of this pin clears the voltage on the wt capacitor, preventing a reset pulse from occurring. if the watchdog timer is not cleared, a reset pulse will occur. the watchdog timer is cleared during a reset and restarts when the reset is deasserted. when disabling the watchdog function, this pin should be connected to either v cc3 or ground and wt must be grounded. rst (pin 6): reset logic output. active low, open-drain logic output with weak pull-up to v cc3 . asserted when one or more of the supplies are below trip thresholds. after all supplies become valid, the reset remains asserted for the period set by the capacitor on the rt pin. the watchdog timer can also trigger the reset whenever the watchdog time-out period is exceeded. this pin can be pulled up greater than v cc3 when interfacing to 5v logic. wt (pin 7): watchdog time-out input. place a capacitor between this pin and ground to adjust the watchdog time- out period. to determine the watchdog time-out period: t wt = 21.8 ? c wt with t wt in s and c wt in pf. as an example, a 47 nf capacitor will generate a 1 s watchdog time-out period. the watchdog function can be disabled by connecting this pin to ground. rt ( pin 8): reset time - out input. place a capacitor between this pin and ground to adjust the reset time-out period. to determine the reset time-out period: t rt = 3.30 ? c rt with t rt in s and c rt in pf. as an example, a 47 nf capaci- tor will generate a 155ms reset time-out period.
ltc1726 7 1726fd for more information www.linear.com/ltc1726 b lock diagra m ti m ing diagra m bandgap reference adjustable reset pulse generator transition detect ? + ? + ? + 1 5 7 v cc3 wdi 2 v cc5 /v cc25 3 v cca 4 gnd 1v 1726 bd 6 rst 2a 22a 6a v cc3 v cc3 v cc5 /v cc25 v cc internal wt watchdog timer power detect 8 rt c rt + 2a 22a c wt + t rt 1726 td01 v rtx v ccx rst t uv 1.5v t wp t wt t rt t wt 1726 td02 wdi rst t rt 1.5v v cc monitor timing watchdog timing diagram
ltc1726 8 1726fd for more information www.linear.com/ltc1726 a pplica t ions i n f or m a t ion figure 2. rst voltage vs supply voltage figure 1. single supply monitor with others disabled are greater than approximately 4.15 v. in this manner, the part can function as a 5 v monitor with the 3.3 v monitor disabled. when monitoring either 3.3 v or 5 v with v cc3 strapped to v cc5 , ( see figure 1) the part determines which is the ap- propriate range. the part handles this situation as shown in figure 2. above 1 v and below v rt 3 , rst is held low. from v rt 3 to approximately 4.15 v, the part assumes 3.3v supply monitoring and rst is deasserted. above approximately 4.15 v, the part operates as a 5 v monitor. in most systems, the 5 v supply will pass through the 3.1v to 4.15 v region in <200 ms during power-up, and the rst output will behave as desired. table 1 summarizes the state of rst at various operating voltages with v cc3 = v cc5 . table 1. override truth table (v cc3 = v cc5 ) inputs (v cc3 = v cc5 = v cc ) rst 0v v cc 1v 1v v cc v rt 3 0 v rt 3 v cc 4.15v 1 4.15v v cc v rt 5 0 v rt 5 v cc 1 supply monitoring the ltc1726 is a low power, high accuracy triple supply monitor and watchdog timer. the watchdog and reset periods are both adjustable using external capacitors. all three v cc inputs must be above predetermined thresh- olds for reset not to be asserted. the ltc1726 will assert reset during power-up, power-down and brownout condi- tions on any one or all of the v cc inputs. upon power-up, either the v cc5 /v cc25 or v cc3 pin can power the drive circuits for the rst pin. this ensures that rst will be low when either v cc5 /v cc25 or v cc3 reaches 1v. as long as any one of the v cc inputs is below its pre- determined threshold, rst will stay a logic low. once all of the v cc inputs rise above their thresholds, the adjustable reset timer is started and rst is released after the reset time-out period. on power-down, once any of the v cc inputs drops below its threshold, rst is held at a logic low. a logic low of 0.3v is guaranteed until both v cc3 and v cc5 /v cc25 drop below 1v. 3v or 5v/2.5v power detect since the ltc1726 is a multisupply monitor, it will be required to assert reset as soon as there is power on any one of the monitor inputs. therefore, the part derives its power from either the v cc3 or v cc5 /v cc25 input, whichever pin has the greatest potential. this ensures the part pulls the rst pin low as soon as either input pin is 1 v. the adjustable input is excluded from being a potential supply pin because of its 1v nominal operating range. override functions (5v versions only) the v cca pin, if unused, can be tied to either v cc3 or v cc5 . this is an obvious solution since the trip points for v cc3 and v cc5 will always be greater than the trip point for v cca . the v cc5 input trip point is disabled if its voltage is equal to the voltage on v cc3 25 mv and the voltage on v cc5 is less than 4.15 v. in this manner the ltc1726-5 behaves as a 3.3v monitor and the 5v reset function is disabled. the v cc5 trip point is re-enabled when the voltage on v cc5 is equal to the voltage on v cc3 25 mv and the two inputs v cc3 v cc5 v cca gnd 6 1 2 3 4 rst ltc1726-5 1726 f01 to system reset pins 5, 7 and 8 not shown for clarity r1 10k v cc 3.3v or 5v supply voltage (v) 0 rst output voltage (v) 3 4 5 4 1726 f02 2 1 0 1 2 3 5 v cc3 = v cc5 = v cca = 0v to 5v 10k pull-up from rst to v cc3 t a = 25c
ltc1726 9 1726fd for more information www.linear.com/ltc1726 a pplica t ions i n f or m a t ion figure 3 contains a simple circuit for 5 v systems that cant risk the rst output going high in the 3.1 v to 4.15 v range (possibly due to very slow rise time on the 5 v supply). diode d1 powers the ltc1726-5 while dropping 0.6v from the v cc5 pin to the v cc3 pin. this prevents the parts internal override circuit from being activated. without the override circuit active, the rst pin stays low until v cc5 reaches v rt 5 ? 4.675v. (see figure 4.) figure 4. rst output voltage characteristics of the circuit in figure 3 figure 3. ltc1726-5 monitoring a single 5v supply. d1 used to avoid rst high near 3.1v to 4v (see figure 2). watchdog timer the watchdog circuit monitors a ps activity. the p is required to change the logic state of the wdi pin on a periodic basis in order to clear the watchdog timer and prevent the ltc1726 from issuing a reset. during power-up, the watchdog timer remains cleared while reset is asserted. as soon as the reset timer times out, the watchdog timer is started. the watchdog timer will continue to run until a transition is detected on the wdi input or until the watchdog timer times out. once the watchdog timer times out, the internal circuitry asserts the reset and starts the reset timer. when the reset timer times out and reset is deasserted, the watchdog timer is again started. if no wdi transition is received within the watchdog time-out period, the reset will be reasserted at the end of the watchdog time-out period. if a transition is received on the wdi input during the watchdog time-out period, the watchdog timer will be restarted and reset will remain deasserted. selecting the reset and watchdog time-out capacitors the reset time-out period is adjustable in order to accom- modate a variety of p applications. the reset time-out period, t rt , is adjusted by connecting a capacitor, c rt , between the rt pin and ground. the value of this capacitor is determined as follows: c rt = t rt /3.30 with c rt in pf and t rt in s (i.e., 1500pf ? 4.95ms). the capacitor should be a low leakage type. a ceramic capacitor is recommended. the watchdog period is also adjustable so that the watchdog time-out period can be optimized for software execution. the watchdog time- out period, t wt , is adjusted by connect- ing a capacitor, c wt , between the wt pin and ground. once the optimum watchdog time- out period ( t wt ) is determined, the value of the capacitor is calculated as follows: c wt = t wt /21.8 with c wt in pf and t wt in s (i.e., 1500pf ? 32.7ms). the capacitor should be a low leakage type. a ceramic capacitor is recommended. v cc3 v cc5 v cca gnd 6 1 2 3 4 rst ltc1726-5 1726 f03 to system reset r1 10k 5v 0.1f d1 d1: mmbd914 or equivalent pins 5, 7 and 8 not shown for clarity v cc5 (v) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 rst output voltage (v) 1726 f04 5 4 3 2 1 0 v cc5 = v cca = 0v to 5v 10k pull-up from rst to v cc5 t a = 25c ltc1726-2.5 override functions the v cca pin, if unused, can be tied to either v cc3 or v cc25 . this is an obvious solution since the trip points for v cc3 and v cc25 will always be greater than the trip point for v cca . likewise, the v cc25 , if unused, can be tied to v cc3 . v cc3 must always be used. tying v cc3 to v cc25 and operating off of a 2.5 v supply will result in the continuous assertion of rst.
ltc1726 10 1726fd for more information www.linear.com/ltc1726 typical a pplica t ions disabling the watchdog timer triple supply monitor (3.3v, 5v and adjustable) dual supply monitor (3.3v and 5v, defeat v cca input) 1 2 3 4 8 7 6 5 v cc3 v cca gnd rt wt rst wdi ltc1726-5/ltc1726-2.5 3.3v system reset *to preserve threshold accuracy, set parallel combination of r1 and r2 66.5k the watchdog timer can be disabled by connecting the wdi and wt pins to ground. the part will act strictly as a triple supply monitor with an adjustable reset time-out period c rt 5v/2.5v r2* r1* 1726 ta03 adjustable supply v cc5 /v cc25 1 2 3 4 8 7 6 5 v cc3 v cc5 v cca gnd rt wt rst wdi ltc1726-5 3.3v system reset *to preserve threshold accuracy, set parallel combination of r1 and r2 66.5k c rt c wt wdi 5v r2* r1* 1726 ta04 adjustable supply or dc/dc feedback divider 1 2 3 4 8 7 6 5 v cc3 v cc5 v cca gnd rt wt rst wdi ltc1726-5 3.3v system reset wdi 5v 1726 ta05 c rt c wt dual supply monitor (3.3v or 5v plus adjustable) dual supply monitor (3.3v plus adjustable) using v cca tied to dc/dc feedback divider 1 2 3 4 8 7 6 5 v cc3 v cc5 v cca gnd rt wt rst wdi ltc1726-5 r2* 1726 ta06 r1* adjustable supply 3.3v or 5v 10k system reset *to preserve threshold accuracy, set parallel combination of r1 and r2 66.5k c rt c wt wdi refer to ltc1726-x override functions in the applications information section 1 2 3 4 8 7 6 5 v cc3 v cc25 v cca gnd rt wt rst wdi ltc1726-2.5 system reset wdi r2* 1726 ta07 r1* adjustable supply 3.3v 10k *to preserve threshold accuracy, set parallel combination of r1 and r2 66.5k c rt c wt 1 2 3 4 8 7 6 5 v cc3 v cc5 v cca gnd rt wt rst wdi ltc1726-5 3.3v system reset wdi 5v 22.1k 1% 1726 ta08 35.7k 1% ltc1435 adjustable reset trip threshold 2.74v 2.9v 2.8k 1% 6 v osense c rt c wt
ltc1726 11 1726fd for more information www.linear.com/ltc1726 ms8 package 8-lead plastic msop (reference ltc dwg # 05-08-1660 rev f) msop (ms8) 0307 rev f 0.53 0.152 (.021 .006) seating plane note: 1. dimensions in millimeter/(inch) 2. drawing not to scale 3. dimension does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.152mm (.006") per side 4. dimension does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.152mm (.006") per side 5. lead coplanarity (bottom of leads after forming) shall be 0.102mm (.004") max 0.18 (.007) 0.254 (.010) 1.10 (.043) max 0.22 ? 0.38 (.009 ? .015) typ 0.1016 0.0508 (.004 .002) 0.86 (.034) ref 0.65 (.0256) bsc 0 ? 6 typ detail ?a? detail ?a? gauge plane 1 2 3 4 4.90 0.152 (.193 .006) 8 7 6 5 3.00 0.102 (.118 .004) (note 3) 3.00 0.102 (.118 .004) (note 4) 0.52 (.0205) ref 5.23 (.206) min 3.20 ? 3.45 (.126 ? .136) 0.889 0.127 (.035 .005) recommended solder pad layout 0.42 0.038 (.0165 .0015) typ 0.65 (.0256) bsc p ackage descrip t ion please refer to http://www .linear.com/designtools/packaging/ for the most recent package drawings.
ltc1726 12 1726fd for more information www.linear.com/ltc1726 p ackage descrip t ion s8 package 8-lead plastic small outline (narrow .150 inch) (reference ltc dwg # 05-08-1610 rev g) .016 ? .050 (0.406 ? 1.270) .010 ? .020 (0.254 ? 0.508) 45 0? 8 typ .008 ? .010 (0.203 ? 0.254) so8 rev g 0212 .053 ? .069 (1.346 ? 1.752) .014 ? .019 (0.355 ? 0.483) typ .004 ? .010 (0.101 ? 0.254) .050 (1.270) bsc 1 2 3 4 .150 ? .157 (3.810 ? 3.988) note 3 8 7 6 5 .189 ? .197 (4.801 ? 5.004) note 3 .228 ? .244 (5.791 ? 6.197) .245 min .160 .005 recommended solder pad layout .045 .005 .050 bsc .030 .005 typ inches (millimeters) note: 1. dimensions in 2. drawing not to scale 3. these dimensions do not include mold flash or protrusions. mold flash or protrusions shall not exceed .006" (0.15mm) 4. pin 1 can be bevel edge or a dimple s8 package 8-lead plastic small outline (narrow .150 inch) (reference ltc dwg # 05-08-1610 rev g) please refer to http://www .linear.com/designtools/packaging/ for the most recent package drawings.
ltc1726 13 1726fd for more information www.linear.com/ltc1726 information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. r evision h is t ory rev date description page number c 10/10 added h-grade to absolute maximum ratings and electrical characteristics sections. 2, 3 d 4/13 clarified ?t rt conditions. 3 (revision history begins at rev c)
ltc1726 14 1726fd for more information www.linear.com/ltc1726 ? linear technology corporation 2000 lt 0413 rev d ? printed in usa linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 fax : (408) 434-0507 www.linear.com/ltc1726 r ela t e d p ar t s typical a pplica t ion part number description comments ltc690 5v supply monitor, watchdog timer and battery backup 4.65v threshold ltc694-3.3 3.3v supply monitor, watchdog timer and battery backup 2.9v threshold ltc699 5v supply monitor and watchdog timer 4.65v threshold ltc1232 5v supply monitor, watchdog timer and push-button reset 4.37v/4.62v threshold ltc1326 micropower precision triple supply monitor for 5v, 3.3v and adj 4.725v, 3.118v, 1v thresholds (0.75%) 5v, 3.3v, adj ltc1326-2.5 micropower precision triple supply monitor for 2.5v, 3.3v and adj 2.363v, 3.118v, 1v thresholds (0.75%) 2.5v, 3.3v, adj ltc1536 precision triple supply monitor for pci applications meets pci t fail timing specifications ltc1727-5 micropower triple supply monitor with individual outputs 4.675v, 3.086v, 1v thresholds (1.5%) 5v, 3.3v, adj ltc1727-2.5 micropower triple supply monitor with individual outputs 2.338v, 3.086v, 1v thresholds (1.5%) 2.5v, 3.3v, adj ltc1728-5 micropower triple supply monitor in 5-pin sot-23 package 4.675v, 3.086v, 1v thresholds (1.5%) 5v, 3.3v, adj ltc1728-2.5 micropower triple supply monitor in 5-pin sot-23 package 2.338v, 3.086v, 1v thresholds (1.5%) 2.5v, 3.3v, adj ltc1728-1.8 micropower triple supply monitor in 5-pin sot-23 package 2.805v, 1.683v, 1v thresholds (1.5%) 3v, 1.8v, adj ltc1985-1.8 micropower triple supply monitor for 3v, 1.8v and adj push-pull reset output, sot-23 ltc2900 quad supply monitor adjustable reset timer ltc2901 quad supply monitor with watchdog timer adjustable w atchdog and reset timers ltc2902 quad supply monitor with selectable supply tolerance reset disable for margining applications ltc2903 precision quad supply monitor in sot-23 fixed and adjustable threshold combinations ltc2908 precision six supply monitor 8-lead thinsot? and 3mm 2mm dfn packages ltc2910 octal positive/negative voltage monitor 8 low voltage adjustable inputs (0.5v) triple supply monitor with watchdog timer and manual reset button v cc3 v cc5 v cca gnd rt wt rst wdi ltc1726-5 1726 ta09 100nf 5v 3.3v 12v ( 5%) v trip = 11.2v ( 0.17v) 47nf r2 105k 0.1% *optional resistor recommended to extend esd tolerance r3* 10k 5% manual reset button (normally open) r1 1.07m 0.1% 47nf 100nf v trip = (r1 + r2) r1 = r2 ? 1 v cca r2 ( ) v trip v cca p reset i/o t rt = 155ms t wt = 1s

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