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  ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| p supervisor circuits 12 - 07 - 0002 pt0 082 - 7 0 7 / 05 /12 1 pt7 a 7 511 - 15/7521 - 25 /7 5 31 - 3 5 features ? precision supply - voltage monitor - 4.63v (pt7 a 7511, 7521, 7531 ) - 4.38 v ( pt7a7512, 7522, 7532 ) - 3.08v ( pt7a7513, 7523, 7533 ) - 2.93v ( pt7a7514, 7524, 7534 ) - 2.63v ( pt7a7515, 7525, 7535 ) ? 200ms reset pulse width ? debounced ttl/cmos - compatible manual - reset inpu t ? independent watchdog timer 1.6sec time - out (not available for pt7a7531 - 7535) ? reset output signal: - active - low only (PT7A7511 - 7515) - active - high only (pt7a7521 - 7525) - active - high and active - low (pt7a7531 - 75 35) ? voltage monitor for power - fail or low battery warning ? guaranteed reset/reset valid at v cc = 1. 2 v description the pt7a751x/752x/753x family micro - processor ( ? p) supervisory circuits are targeted to improve reliability and accuracy of power - supply c ircuitry in ? ps systems. these devices reduce the complexity and number of components required to monitor power - supply and battery functions. the main functions are: 1. asserting reset output during power - up, power - down and brownout conditions for ? p system . 2. detecting power failure or low - battery conditions with a 1.25v threshold detector. 3. watchdog functions (not for pt7a753x) applica tion ? power - supply circuitry in ? p systems pin configuration top view 1 2 3 4 8 7 6 5 mr v cc gnd pfi wdo reset wdi pfo PT7A7511p - 751 5 p PT7A7511w - 751 5 w 8 - pin pdip/8 - pin soic 1 2 3 4 8 7 6 5 mr v cc gnd pfi wdo reset wdi pfo pt7a7521p - 752 5 p pt7a 7521w - 752 5 w 8 - pin pdip/8 - pin soic 1 2 3 4 8 7 6 5 mr v cc gnd pfi reset reset nc pfo pt7a7531p - 753 5 p pt7a7531w - 753 5 w 8 - pin pdip/8 - pin soic
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||| 12 - 07 - 0002 pt0 082 - 7 0 7 / 05 /12 2 pt7 a 7 511 - 15/7521 - 25 /7 5 31 - 3 5 p supervisor circuits pin description pin type description mr i manua l - reset: triggers a reset pulse when pulled below 0.8v, active low. it has an internal 250ma pull - up current and be driven from a ttl or cmos logic line as well as shorted to ground with a switch. v cc power supply voltage. gnd ground ground reference f or all signals . pfi i power - fail voltage monitor input. when pfi is less than 1.25v, pfo goes low. connect pfi to gnd or vcc when not used. pfo o power - fail output: it gets low and sinks current when pfi is less than 1.25v; otherwise pfo stays high. wdi i watchdog input : if wdi remains high or low for 1.6sec, the internal watchdog timer runs out and wdo goes low. floating wdi or connecting wdi to a high - impedance three - state buffer disables the watchdog feature. the internal watchdog timer clears w henever reset is asserted. wdi is three - stated, or wdi sees a rising or falling edge. reset o reset output pulses: low for 200ms when triggered, and stays low whenever vcc is below the reset threshold. it remains low for 200ms after vcc rises above the reset threshold or mr goes from low to high. a watchdog timeout will not trigger reset unless wdo is connected to mr. wdo o watchdog output: pulls low when the internal watchdog timer finishes its 1.6sec count and does not go high again until t he watchdog is cleared. wdo also goes low during low - line conditions. whenever vcc is below the reset threshold, wdo stays low; however, unlike reset, wdo does not have minimum pulse width. as soon as vcc rises above the reset threshold, wdo goes high with no delay. reset o the inverse of reset, active high. whenever reset is high, reset is low. block diagram block diagram of PT7A7511 - 7515/7521 - 7525 v cc 250ua v rst 1.25v watchdog transition detector watchdog timer wdi wdo timebase for reset & watchdog reset generator mr vcc pfi reset (reset) pfo
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||| 12 - 07 - 0002 pt0 082 - 7 0 7 / 05 /12 3 pt7 a 7 511 - 15/7521 - 25 /7 5 31 - 3 5 p supervisor circuits block diagram of pt7a75 31 - 35 maximum ratings storage temperature ................... ......................................... - 65 o c to +150 o c ambient temperature with power applied.......................... - 40 o c to +85 o c supply voltage to ground potential (vcc to gnd) .............. - 0.3v to +7.0v dc input voltage (all inputs except vcc an d gnd)...... - 0.3v to v cc +0.3v dc output current (all outputs) ..........................................................20ma power dissipation .......................................... 500 mw (depend on package) recommended operation conditions sym des cription test conditions min typ max unit v cc supply voltage for 75x1,75x2 - 4.5 5.0 5.5 v supply voltage for 75x3,75x4 - 3.0 3.3 5.5 v supply voltage for 75x5 2.7 3.0 5.5 v ih 1 m r input high voltage v cc > 4.0v 2.0 2.4 - v v cc 4.0v 0.7v cc - - v v ih 2 wdi input high voltage - 0.7v cc - - v v il 1 mr input low voltage v cc > 4.0v - - 0.8 v v cc 4.0v - - 0. 2 v cc v v il 2 wdi input low voltage - - - 0.3v cc v t a operating temperature - - 40 - 85 note: stresses greater than those listed under maximum ratings may cause permanent damage to the device. th is is a stress rating only and functional operation of the device at these or any other condi - tions above those indicated in the operational sec - tions of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. reset generator mr vcc pfi pfo reset 1.25v v rst vcc 250ua reset
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||| 12 - 07 - 0002 pt0 082 - 7 0 7 / 05 /12 4 pt7 a 7 511 - 15/7521 - 25 /7 5 31 - 3 5 p supervisor circuits dc electrical characteristic s (v cc = v rn + 5% to 5.5v, t a = - 40~85oc, unless otherwise noted.) (note 1) symbol description test conditions min typ max unit i cc supply current 75x1/x2 vcc = 5v, 75x3/x4 vcc = 3.3 v , 75x5 vcc = 3.0 v , left wdi un - connected ( no output load ) - 30 200 a v ih input high voltage pin: mr, wdi 0.7v cc - - v v il input low voltage pin: mr, wdi - - 0.3v cc v v rst reset threshold voltage ( note 2 ) t a = 25oc v rn - 1 .5% v rn v rn + 1 .5% v 75x1 4.560 4.630 4.699 75x2 4.314 4.380 4.446 75x3 3.034 3.080 3.126 75x4 2.886 2.930 2.974 75x5 2.590 2.630 2.669 v rth note 2 ) v cc v aries between v rn - 5% - 70 - m v v oh output high voltage vcc ? ? ? ol output low voltage vcc ? ? ? pft pfi input threshold v pfi varies from 1. 0 v to 1. 5 v 1.2 3 1.25 1. 27 v v pfi varies from 0 v to 1.0v 1.20 1.25 1.30 i pfi pfi input current pfi connected to vcc - - 2.00 a pfi connected to gnd - 2.00 - - i wdi average wdi input current ( note 3 ) wdi connected to v cc - 30 1 0 0 a wdi connected to gnd - 100 - 30 - i mr mr input current mr=0, vcc = 5v - 600 - 250 - 100 a note : 1. parameters of room temperature guaranteed by production test and parameters of full - temperature guaranteed by design. 2. valid for both reset and reset. v rst i s the reset threshold voltage when v cc from high to low lev el , v rn is nominal reset threshold voltage. 3. wdi is internally serviced within the watchdog period if wdi is left unconnected.
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||| 12 - 07 - 0002 pt0 082 - 7 0 7 / 05 /12 5 pt7 a 7 511 - 15/7521 - 25 /7 5 31 - 3 5 p supervisor circuits ac electrical characteristics symbol description test conditions min typ max unit t rs reset pulse width mr fr om low to high, t a =25 1 6 0 200 280 ms t wd watchdog timeout period wdi, mr tied to vcc, vcc>v rn +5% , t a =25 1. 2 1.6 2.25 s t mr mr pulse width - 200 - - n s t md mr to reset delay vcc=5v - - 250 ns t wp wdi pulse width - 150 - - ns watchdog timing d iagram watchdog timing diagram t wp t wd t wd t wd t rs wdi wdo reset reset 5v 0v 5v 0v 5v 0v 5v 0v externally triggered by mr v rt t rs t rs t mr t md wdo reset mr 5v 0v v rt v cc 5v 0v 5v 0v 5v 0v
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||| 12 - 07 - 0002 pt0 082 - 7 0 7 / 05 /12 6 pt7 a 7 511 - 15/7521 - 25 /7 5 31 - 3 5 p supervisor circuits functional description the pt75xx family can assert reset output during power - up, power - down and brownout conditions for ? p system, detect power failure or low - battery conditions with a 1.25v threshold detector and h ave watchdog functions. refer to function table of pt7a75xx family for their individual features. the typical application see figure 4. reset output the supervisory circuits can assert reset for a microprocessor during power - up, power - down and brownout t o prevent code execution errors. on power - up, once vcc reaches about 1. 2 v, reset is a guaranteed logic low of 0.4v or less. as vcc rises, reset stays low. when vcc rises above the reset threshold, an internal timer releases reset after about 200ms. r eset pulses low whenever vcc drops below the reset threshold, i.e. brownout condition. if brownout occurs in the middle of a previously initiated reset pu lse, the pulse continues for at least another 14 0ms. on power - down, once vcc falls below the reset thr eshold, reset stays low and is guaranteed to be 0.4v or less until vcc drops below 1.0v. the pt7a752x and pt7a753x active - high reset output is simply the inverse of the reset output, and is guaranteed to be valid with vcc down to 1. 2 v. some ? ps, such as intels 80c51, require an active - high reset pulse. watchdog timer the watchdog circuit monitors the ? p activity. if the ? p does not toggle the watchdog input (wdi) within 1.6sec and wdi is not in high impedance, wdo goes low. as long as res et is asserted or the wdi input is in high impedance, the watchdog timer will stay cleared and will not count. as soon as reset is released and wdi is driven high or low, the timer will start counting. p ulses as short as 50ns can be detected. typica lly, wdo will be connected to the non - maskable interrupt input (nmi) of a ? p. when v cc drops below the reset threshold, wdo will go low whether or not the watchdog timer has timed out yet. normally this would trigger an nmi interrupt, but reset goes low simultaneously, and thus overr ides the nmi interrupt. if wdi is left unconne cted, wdo can be used as a low - line output. since floating wdi disables the internal timer, wdo goes low only when v cc falls below the reset threshold, thus functioning as a low - line output. manual reset the manual - reset input (mr) allows reset to be t riggered by a push button switch. the switch is effectively debounced by the 140ms minimum reset pulse width. mr is ttl/cmos logic compatible, so it can be driven by any logic reset output. power - fail comparator the power - fail comparator will send out a low signal once detects a voltage lowered than 1.25v. it can be used for various purposes because its output and non - inverting input are not internally connected. the inverting input is internally connected to a 1.25v reference.. typical application circu it dc linear regulator vcc supervisory pfi circuit wdi ? p vcc reset i/o line nmi interrupt in out reset wdo pfo mr ? p
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||| 12 - 07 - 0002 pt0 082 - 7 0 7 / 05 /12 7 pt7 a 7 511 - 15/7521 - 25 /7 5 31 - 3 5 p supervisor circuits mechanical information we (lead free and green soic - 8) min max a 1.350 1.750 a1 0.100 0.250 a2 1.350 1.550 b 0.330 0.510 c 0.170 0.250 d 4.700 5.100 e 3.800 4.000 e1 5.800 6.200 e l 0.400 1.270 0 8 symbol dimensions in millimeters 1.27 bsc note: 1) controlling dimensions in millimeters. 2) ref : jedec ms - 012e/aa
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||| 12 - 07 - 0002 pt0 082 - 7 0 7 / 05 /12 8 pt7 a 7 511 - 15/7521 - 25 /7 5 31 - 3 5 p supervisor circuits pe (lead free dip - 8 ) min max a 3.710 4.310 a1 0.510 a2 3.200 3.600 b 0.380 0.570 b1 c 0.204 0.360 d 9.000 9.400 e 6.200 6.600 e1 7.320 7.920 e l 3.000 3.600 e2 8.400 9.000 symbol 1.524 bsc 2.540 bsc dimensions in millimeters note: 1 ) controlling dimensions in millimeters. 2 ) ref : jedec ms - 001 d/ba
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||| |||||||||||||||||||||||||||||||||||||||||||||||||||||| 12 - 07 - 0002 pt0 082 - 7 0 7 / 05 /12 9 pt7 a 7 511 - 15/7521 - 25 /7 5 31 - 3 5 p supervisor circuits ordering information part number package code package pt7a751xpe p lead free dip - 8 pt7a752xpe p lead free dip - 8 pt7a753xpe p lead free dip - 8 pt7a751xwe w lead free and green soic - 8 pt7a752xwe w lead free and green soic - 8 pt7a753xwe w lead free and green soic - 8 n ote: ? x refers to voltage range, see function comparison t able in page 1 . ? e= lead - free or lead - free and green ? adding x suffix=tape/reel ? contact pericom for availability. function comparison table part no. reset threshold reset active low or high nom. reset time (ms), t rs nom. watch dog time (sec), t wd power fail comp. manual reset input PT7A7511 4.63v low 2 00 1.6 1.25v detector yes pt7a7521 4.63v high 200 1.6 1.25v detector yes pt7a7531 4.63v low, high 200 unavailable 1.25v detector yes pt7a7512 4.38v low 200 1.6 1.25v detector yes pt7a7522 4.38v high 200 1.6 1.25v detector yes pt7a7532 4.38v low, high 200 unavailable 1.25v detector yes pt7a7513 3.08v low 200 1.6 1.25v detector yes pt7a7523 3.08v high 200 1.6 1.25v detector yes pt7a7533 3.08v low, high 200 unavailable 1.25v detector yes pt7a7514 2.93v low 200 1.6 1.25v detector yes pt7a7524 2.93v hi gh 200 1.6 1.25v detector yes pt7a7534 2.93v low, high 200 unavailable 1.25v detector yes pt7a7515 2.63v low 200 1.6 1.25v detector yes pt7a7525 2.63v high 200 1.6 1.25v detector yes pt7a7535 2.63v low, high 200 unavailable 1.25v detector yes pericom semiconductor corporation ? 1 - 800 - 435 - 2336 ? www.pericom.com pericom reserves the right to make changes to its products or specifica tions at any time, without notice, in order to improve design or performance and to supply the best possible product. pericom does not assume any responsibility for use of any circuitry described other than the circu itry embodied in pericom product. the co mpany makes no representations that circuitry described herein is free from patent infringement or other rights, of pericom .


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