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march 2007 rev 5 1/21 1 stm6315 open drain microprocessor reset features low supply current of 1.5a (typ) 1.8% reset threshold accuracy (25c) guaranteed rst assertion down to v cc = 1.0v open drain rst output can exceed v cc power supply transient immunity operating temperature: ?40 to +125c available in sot143-4 package. sot143-4 (w1) www.st.com
contents stm6315 2/21 contents 1 summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 manual reset input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 negative-going v cc transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.4 valid rst output down to v cc = 0v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3 typical operating char acteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4 maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 5 dc and ac parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 7 part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
stm6315 list of tables 3/21 list of tables table 1. signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 table 2. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 table 3. operating and ac measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 4. dc and ac characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 5. sot143-4 ? 4-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . 17 table 6. ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 table 7. marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 table 8. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
list of figures stm6315 4/21 list of figures figure 1. logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 2. sot143-4 connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 3. block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 4. hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 5. reset timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 6. manual reset timing diagram, switch bounce/debounce . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 7. supply current vs. supply voltage, v rst = 2.63v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 figure 8. supply current vs. temperature (no load), v rst = 2.63v . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 figure 9. rst output voltage vs. output current, v cc = 4.25v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 10. normalized reset time-out period vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 11. normalized reset threshold vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 12. max. transient duration not causing reset pulse vs. reset threshold overdrive . . . . . . . . . 11 figure 13. ac testing input/output waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 figure 14. sot143-4 ? 4-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . 17
stm6315 summary description 5/21 1 summary description the stm6315 microprocessor reset circuit is a low power supervisory device used to monitor power supplies. it performs a single function: asserting a reset signal whenever the v cc supply voltage drops below a preset value and keeping it asserted until v cc has risen above the preset threshold for a minimum period of time (t rec ). it also provides a manual reset input (mr ). the open drain rst output can be pulled up to a voltage higher than v cc , but less than 6v. the stm6315 comes with standard factory-trimmed reset thresholds of 2.63v, 2.93v, 3.08v, 4.38v, and 4.63v. the stm6315 is available in the sot143-4 package. figure 1. logic diagram figure 2. sot143-4 connections (top view) table 1. signal names symbol description v cc supply voltage mr manual reset input rst active-low open drain reset output v ss ground ai11162 v cc stm6315 v ss rst mr 1 rst v cc v ss ai11163 2 3 4 mr
summary description stm6315 6/21 figure 3. block diagram figure 4. hardware hookup 1. open drain rst output requires exter nal pull-up resistor. ai11164 v rst rst compare t rec generator v cc mr debounce ai11165 v cc v cc mr stm6315 mcu rst (1) reset input 10k v cc v ss v ss manual reset
stm6315 operation 7/21 2 operation 2.1 reset output the stm6315 microprocessor reset circuit has an active-low, open drain reset output. this output structure will si nk current when rst is asserted. connect a pull-up resistor from rst to any supply voltage up to 6v (see figure 4 on page 6 ). 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 10k pull-up is sufficient in most applications. the stm6315 asserts a reset signal to the mcu whenever v cc goes below the reset threshold (v rst ), or when the manual reset input (mr ) is taken low (see figure 5 and figure 6 on page 8 ). rst is guaranteed valid down to v cc = 1.0v. during power-up, (once v cc exceeds the reset threshold) an internal timer keeps rst low for the reset time-out period, t rec . after this interval, rst returns high. if v cc drops below the reset threshold, rst goes low. each time rst is asserted, it stays low for at least the reset time-out period. any time v cc goes below the reset threshold, the internal timer clears. the reset timer starts when v cc returns above the reset threshold. 2.2 manual reset input a logic low on mr asserts rst . rst remains asserted while mr is low, and for t rec after it returns high. the mr input has an internal pull-up resistor 63k (typ), allowing it to be left open if not used. this input can be driven with ttl/cmos-logic levels or with open drain/collector outputs. connect a standard open push-button switch from mr to v ss to create a manual reset function (see figure 4 on page 6 ); external debounce circuitry is not required. if the device is used in a noisy environment, connect a 0.1f capacitor from mr to v ss to provide additional noise immunity. 2.3 negative-going v cc transients the stm6315 is relatively immune to negative-going v cc transients (glitches). figure 12 on page 11 shows typical transient duration versus reset comparator overdrive (for which the stm6315 will not generate a re set pulse). the graph was generated usin g a negative pulse applied to v cc , starting at 0.5v above the actual reset threshold and ending below it by the magnitude indicated (reset threshold overdrive). the graph indicates the maximum pulse width a negative v cc transient can have without causing a reset pulse. as the magnitude of the transient increases (further below the threshold), the maximum allowable pulse width decreases. any combination of duration and overdrive which lies under the curve will not generate a reset signal (see figure 12 ). a 0.1f bypass capacitor mounted as close as possible to the v cc pin provides additional transient immunity.
operation stm6315 8/21 2.4 valid rst output down to v cc = 0v when v cc falls below 1v, the rst output no longer sinks current, but becomes an open circuit. in most systems this is not a prob lem, as most mcus do not operate below 1v. however, in applications where rst output must be valid down to 0v, a pull-down resistor may be added to hold the rst output low. this resistor must be large enough to not load the rst output, and still be sm all enough to pull the ou tput to ground. a 100k resistor is recommended. figure 5. reset timing diagram figure 6. manual reset timing diagram, switch bounce/debounce ai11166 rst v cc v rst v cc (min) t rec ai11167b rst mr trec mr-to-rst delay mr glitch rejection mr input pulse width
stm6315 typical operating characteristics 9/21 3 typical operating characteristics note: typical values are at t a = 25c. figure 7. supply current vs. supply voltage, v rst = 2.63v figure 8. supply current vs. temperature (no load), v rst = 2.63v supply voltage, v cc ( v ) supply current, i cc (a) ai11871c 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 2.50 2.75 3.00 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 temperature, t a ( c) supply current, i cc (a) ai11872c 0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00 2.25 ?40 ?20 0 20 40 60 80 100 120 v cc = 2v v cc = 3v v cc = 4v v cc = 5v
typical operating characteristics stm6315 10/21 figure 9. rst output voltage vs. output current, v cc = 4.25v figure 10. normalized reset time-out period vs. temperature output current (ma) output voltage (v) ai11873c 0 0.04 0.08 0.12 0.16 0.20 0369 12 temperature, t a ( c) ai11875b normalized reset time-out period, t rec /t rec (typ) (?) 0.98 1.00 1.02 1.04 1.06 1.08 1.10 1.12 1.14 ?40 ?20 0 20 40 60 80 100 120
stm6315 typical operating characteristics 11/21 figure 11. normalized reset threshold vs. temperature figure 12. max. transient duration not causi ng reset pulse vs. reset threshold overdrive note: reset occurs above the curve. temperature, t a ( c) normalized reset threshold, v rst /v rst-typ (?) ai11876c 0.99 0.995 1 1.005 1.01 ?40 ?20 0 20 40 60 80 100 120 reset threshold overdrive (mv) transient duration (s) ai11877 0 10 20 30 40 50 60 70 80 90 100 1 10 100 1000
maximum rating stm6315 12/21 4 maximum rating stressing the device above the rating listed in the table 2: absolute maximum ratings 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 the operating sections 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 2. 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 260c (total th ermal budget not to exceed 245c 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
stm6315 dc and ac parameters 13/21 5 dc and ac parameters this section summarizes the operating measurement conditions, and the dc and ac characteristics of the device. the parameters in the dc and ac characteristics tables that follow are derived from tests performed under the measurement conditions summarized in table 3: operating and ac measurement conditions . designers should check that the operating conditions in their circuit match the operating conditions when relying on the quoted parameters. figure 13. ac testing input/output waveforms table 3. operating and ac measurement conditions parameter stm6315 unit v cc supply voltage 1.0 to 5.5 v ambient operating temperature (t a ) ?40 to +125 c input rise and fall times ~5 ns input pulse voltages 0.2 to 0.8v cc v input and output timing reference voltages 0.3 to 0.7v cc v ai02568 0.8v cc 0.2v cc 0.7v cc 0.3v cc
dc and ac parameters stm6315 14/21 table 4. dc and ac characteristics sym description test condition (1) min typ max unit v cc operating voltage 1.0 5.5 v i cc v cc supply current v cc = 5.5v, no load t a = ?40 to +85c 2.0 12 a v cc = 5.5v, no load t a = ?40 to +125c 15 a v cc = 3.6v, no load t a = ?40 to +85c 1.5 10 a v cc = 3.6v, no load t a = ?40 to +125c 12 a v ol rst output voltage v cc > 4.25v, i sink = 3.2 m a0.4v v cc > 2.5v, i sink = 1.2 m a0.3v v cc > 1.0v, i sink = 80 a0.3v rst output open drain leakage current v cc > v rst , rst not asserted 1a reset thresholds v rst reset threshold (2) (see table 6 on page 18 for detailed listing) v cc falling; t a = 25c v rst ? 1.8% v rst v rst + 1.8% v v cc falling; t a = ?40 to 85c v rst ? 2.5% v rst + 2.5% v v cc falling; t a = ?40 to 125c v rst ? 3.5% v rst + 3.5% v t rd v cc -to-rst delay v cc falling from (v rst + 100mv) to (v rst ? 200mv) at 1mv/s 35 s t rec rst pulse width (2) stm6315xaxxxx t a = ?40 to +85c 1 1.5 2ms t a = ?40 to +125c 0.8 2.4 ms stm6315xbxxxx t a = ?40 to +85c 20 30 40 ms t a = ?40 to +125c 16 48 ms stm6315xdxxxx t a = ?40 to +85c 140 210 280 ms t a = ?40 to +125c 112 336 ms stm6315xgxxxx t a = ?40 to +85c 1120 1680 2240 ms t a = ?40 to +125c 896 2688 ms reset threshold temperature coefficient 60 ppm/c
stm6315 dc and ac parameters 15/21 manual reset input v il mr low input threshold v rst > 4.0v 0.8 v v rst < 4.0v 0.3v cc v v ih mr low input threshold v rst > 4.0v 2.4 v v rst < 4.0v 0.7v cc v mr input pulse width 1 s mr glitch rejection 100 ns mr -to-rst delay 500 ns mr pull-up resistance 32 63 100 k 1. valid for ambient operating temperature: t a = ?40 to 125c; v cc = 2.5 to 5.5v (except where noted). 2. other v rst thresholds and t rec timings are offered. minimum order quantitie s may apply. contact local sales office for availability. table 4. dc and ac characteristics (continued) sym description test condition (1) min typ max unit
package mechanical data stm6315 16/21 6 package mechanical data in order to meet environmental requirements, st offers these devices in ecopack ? packages. these packages have a lead-free second level interconnect. the category of second level interconnect is marked on the package and on the inner box label, in compliance with jedec standard jesd97. the maximum ratings related to soldering conditions are also marked on the inner box label. ecopack is an st trademark. ecopack specifications are available at: www.st.com.
stm6315 package mechanical data 17/21 figure 14. sot143-4 ? 4-lead small outline transistor package outline note: drawing is not to scale. sot143-4 0.10 c a a2 a1 4x b2 c m cab 0.15 c l1 l c e1 d e e/2 e m 0.15 cab b e1 a m cab 3x b 0.20 1 table 5. sot143-4 ? 4-lead small outline transistor package mechanical data symbol mm inches typ min max typ min max a ? 0.89 1.12 ? 0.035 0.044 a1 ? 0.01 0.10 ? 0.001 0.004 a2 ? 0.88 1.02 ? 0.035 0.042 b ? 0.37 0.51 ? 0.015 0.020 b2 ? 0.76 0.94 ? 0.030 0.037 c ? 0.09 0.18 ? 0.004 0.007 d ? 2.80 3.04 ? 0.110 0.120 e ? 2.10 2.64 ? 0.083 0.104 e1 ? 1.20 1.40 ? 0.047 0.055 e1.92? ?0.076? ? e1 0.20 ? ? 0.008 ? ? l0.55? ?0.022? ? l1 ? 0.40 0.60 ? 0.016 0.024 0 10 0 10 n4 4
part numbering stm6315 18/21 7 part numbering table 6. ordering information scheme note: for other options, or for more information on any aspect of this device, please contact the st sales office nearest you. example: stm6315 r d w1 3 f device type stm6315 reset threshold voltage (1) 1. other v rst thresholds and t rec timings are offered. minimum order quantities may apply. contact local sales office for availability. l = v rst = 4.63v m = v rst = 4.38v s = v rst = 2.93v r = v rst = 2.63v rst pulse width (1) a = t rec = 1.5ms b = t rec = 30ms d = t rec = 210ms g = t rec = 1680ms package w1 = sot143-4 temperature range 3 = ?40 to 125c s hipping method f = ecopack package, tape & reel
stm6315 part numbering 19/21 table 7. marking description part number reset threshold (1) (v) 1. other v rst thresholds and t rec timings are offered. minimum order quantities may apply. contact local sales office for availability. rst pulse width (1) (ms) output topside marking (2) 2. where "x" = assembly wo rk week (a to z), such that "a" = ww01-02, "b" = ww03-04, and so forth. stm6315lb 4.63 30 open drain rst 9lbx stm6315md 4.38 210 open drain rst 9mdx stm6315sd 2.93 210 open drain rst 9sdx stm6315ra 2.63 1.5 open drain rst 9rax stm6315rb 2.63 30 open drain rst 9rbx stm6315rd 2.63 210 open drain rst 9rdx stm6315rg 2.63 1680 open drain rst 9rgx
revision history stm6315 20/21 8 revision history table 8. document revision history date revision changes 14-nov-2005 1.0 first edition. 08-feb-2006 2.0 update template, characteristics, marking (figure 7 , 8 , 9 , 10 , and 11 ; ta bl e 4 , 6 , and 7 ). 12-apr-2006 3 updated characteristics (figure 7 , 8 , and 11 ; table 4 , 6 , and 7 ). 27-jul-2006 4 updated ta bl e 3 , 5 and 6 . 21-mar-2007 5 updated ta bl e 2 , 6 , and 7 .
stm6315 21/21 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. all 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 parti cular purpose (and their equivalents under the laws of any jurisdiction), or infringement of any patent, copyright or other intellectual property right. unless expressly approved in writing by an authorized st representative, st products are not recommended, authorized or warranted for use in milita ry, air craft, space, life saving, or life sustaining applications, nor in products or systems where failure or malfunction may result in personal injury, death, or severe property or environmental damage. st products which are not specified as "automotive grade" may only be used in automotive applications at user?s own risk. 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. ? 2007 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 - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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