||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||| |||||||||||||||||||||||||||||||||||||||||| | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||| supervisory circuit 2013 - 06 - 0001 pt01 95 - 4 0 6/ 1 7 /1 3 1 pt7m 1233/1233a features ? high accurate: ? 1.5% (25c) ? operating voltage range: 1.0v ~ 5.5v ? operating temperature range: - 40c to + 85c ? detect voltage temperature characteristics: ? 2.5% ? typ ? output configuration: bi - dir ? reset timeout period: typical 200ms descriptio n the pt7m 1233 /1233a serie s are designed to monitor power supplies in p and digital systems. t hey provide excellent circuit reliability and low cost by eliminating external components and adjustments. t he device s perform a single function: assert a reset signal whenever the v cc supply voltage falls below a preset threshold. reset remains asserted 200ms after v cc has risen above the reset threshold. pt7m 1233 /1233a are bidirectional output, allowing it to monitor a pushbutton on the reset output . pin con figuration pin description name type description i/o reset output and pushbutton input : rst is asserted when v cc drops below voltage threshold v th - . active low. when other devices pull rst low, the reset condition occurs and will remain a re set timeout period at least 200ms. gnd p ground vcc p supply voltage. rst
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||| 2013 - 06 - 0001 pt01 95 - 4 0 6/ 1 7 /1 3 2 pt7m 1233/1233a supervisory circuit 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 and gnd)...... - 0.3v to v cc +0.3v dc output current (all outputs) ...................................................... ....30ma power dissipation .......................................... 320mw (depend on package) dc electrical characteristics (t a = - 40~85oc, unless otherwise noted. typical values are at t a = +25oc) description sym. test conditions min typ max unit sup ply voltage v cc 1.0 - 5.5 v supply current i cc v cc = 5.5v. no load. - - 12 a v cc = 3.6v. no load. - - 10 a voltage threshold v th - +25 ? th - ) ? th - (v th - ) ? ? ? th - ) ? th - (v th - ) ? th - +25 ? th - ) ? th - ) ? ? ? th - ) ? th - ) ? th - +25 ? th - ) ? th - ) ? ? ? th - ) ? th - ) ? hys v th+ - v th - * - 50 - mv output driving output low v ol i oh = 8ma, v cc = 5v - - 0.4 v i oh = 4ma, v cc = 3v - - 0.3 i oh = - 50a, v cc = 1v - - 0.09 note: v th - is voltage threshold when v cc falls from high to low. v th+ is voltage threshold when v cc rises fro m low to high. note: stresses greater than those listed under maximum rati ngs may cause permanent damage to the device. this 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 absolut e maximum rating conditions for extended periods may affect reliability.
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||| |||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||| 2013 - 06 - 0001 pt01 95 - 4 0 6/ 1 7 /1 3 3 pt7m 1233/1233a supervisory circuit ac electrical characteristics timing diagram (v cc = 1.0v to 5.5v, t a = - 40~85oc, unless otherwise noted. typical values are at t a = +25oc) sym. description test conditions min typ max unit t rs reset timeout period - 140 200 280 ms t rpd delay - - 17 - ? sen sensitivity - 20 - - ? pd external pull down signal pulse rst pin 1 - - ? vcc v rst 1v 0v t rs t sen t rs t rpd 1v 0v rst vcc v rst 1v 0v t rs 1v 0v uncertain state 0.8v t pd t rs external pull down signal release 0.8v cc rst note: if t pd < t rs , the reset pulse width will be t rs ; if t pd > t rs , the width will be t pd + t rs .
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||| |||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||| 2013 - 06 - 0001 pt01 95 - 4 0 6/ 1 7 /1 3 4 pt7m 1233/1233a supervisory circuit block diagram function description power monitor a microprocessors (ps) reset input starts the p in a known state. whenever the p is in an unknown state, it should b e held in reset. the supervisory circuits assert reset during power - up and prevent code execution errors during power - down or brownout conditions. on power - up, once vcc reaches about 1 . 0 v, rst is a guaranteed logic low of 0.4v or less. as vcc rises, rst stays low. when vcc rises above the reset threshold v rst , an internal timer releases rst after about 200ms. rst asserts whenever vcc drops below the reset threshold, i.e. brownout condition. if brownout occurs in the middle of a previously initiated r eset pulse, the pulse continues for at least another 200ms. on power - down, once vcc falls below the reset threshold, rst stays low and is guaranteed to be 0.4v or less until vcc drops below 1v. reset output: bi - direction pt7m1233 the devices provid e rst output pin for a pushbutton switch. when the devices are not in a reset cycle, it continuously monitors the rst signal for a low going edge. if an edge is detected, the devices will debounce the switch by pulling the rst line low . after the internal timer has expired, the devices will continue to monitor the rst line. if the line is still low, they will continue to monitor the line looking for a rising edge. upon detecting a release, they will force the rst line low and hold it low for 20 0ms. pt7m12 33a when an out - of - tolerance condition is detected, an internal power fail signal is generated which forces reset to the active state. when v cc returns to an in - tolerance condition, the reset signal is kept in the active state for approximately 20 0ms to al low the power supply and p rocessor to stabilize. the second function of the pt7m 1233a is pushbutton reset control. the pt7m 1233a debounces a pushbutton closure and will generate a 20 0ms reset pulse upon release. t.c. reference reset monitor timing delay vcc gnd 5k rst vcc resistor divider
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||| |||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||| 2013 - 06 - 0001 pt01 95 - 4 0 6/ 1 7 /1 3 5 pt7m 1233/1233a supervisory circuit application information typical operation c ircuit pt7m 1233 application example pt7m1233/1233a rst vcc reset microprocessor
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||| |||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||| 2013 - 06 - 0001 pt01 95 - 4 0 6/ 1 7 /1 3 6 pt7m 1233/1233a supervisory circuit mechanical information tc (sot223 - 3 ) symbol min max a 1.52 1.8 a1 0 0.1 a2 1.5 1.7 b 0.66 0.82 c 0.25 0.35 d 6.2 6.4 d1 2.9 3.1 e 3.3 3.7 e1 6.83 7.07 e e1 4.5 4.7 l 0.9 1.15 0 10 pkg. dimensions(mm) 2.30bsc document control no. pd-0022 revision: b date: 5/16/2011 pericom technology (shanghai) co.ltd . 3 /f., 20 building , 481 gui ping road, shanghai, 200233 tel:( 86 - 21 ) 6485 - 0576 . fax: ( 86 - 21 ) 6485 - 2181 description: 3 - pin sot 223 package code: tc3 note: 1) ref : jedec to - 261c
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||| |||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| |||||||||||||||||||||||||| 2013 - 06 - 0001 pt01 95 - 4 0 6/ 1 7 /1 3 7 pt7m 1233/1233a supervisory circuit ordering information part number package code package pt7m 1233 - 15tce t c l ead free and green sot223 pt7m 1233 - 10tc e t c l ead free and green sot223 pt7m 1233 - 5tc e t c l ead free and green sot223 pt7m 1233a - 15tce t c l ead free and green sot223 pt7m 1233a - 10tc e t c l ead free and green sot223 note: ? e = pb - free or pb - free and green ? adding x suffix = tape /r eel ? contact pericom for availa bility. function c omparison table pericom semiconductor corporation ? 1 - 800 - 435 - 2336 ? www.pericom.com pericom reserves the right to make changes to its products or specifications 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 company makes no rep resentations that circuitry described herein is free from patent infringement or other rights, of pericom . item part no. reset output threshold 1 pt7m 1233 - 15 bi - direct , active low 4.1v 2 pt7m 1233 - 10 bi - direct , active low 4.3v 3 pt7m 1233 - 5 bi - direct , active low 4.6v 4 pt7m1233a - 15 bi - direct , active low 2.72v 5 pt7m1233a - 10 bi - direct , active low 2.8 8v
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