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february 2010 doc id 10373 rev 6 1/18 1 stm1001 reset circuit features precision monitoring of 3 v, 3.3 v, and 5 v supply voltages open drain rst output 30 ms or 140 ms reset pulse width (min) low supply current - 6 a (typ) guaranteed rst assertion down to v cc = 1.0 v operating temperature: ? ?40 c to 85 c (industrial grade) lead-free, small sot23 package sot23-3 (wx) www.st.com
contents stm1001 2/18 doc id 10373 rev 6 contents 1 description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 negative-going v cc transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3 typical operating char acteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 4 maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 5 dc and ac parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 6 package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 7 part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 8 revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
stm1001 list of tables doc id 10373 rev 6 3/18 list of tables table 1. signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 table 2. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 table 3. operating and ac measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 table 4. dc and ac characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 table 5. sot23-3 ? 3-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . . 14 table 6. ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 table 7. marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 table 8. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
list of figures stm1001 4/18 doc id 10373 rev 6 list of figures figure 1. logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 2. connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 3. block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 4. hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 figure 5. supply current vs. temperature, l/m/r/s/t (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 6. power-down reset delay vs. temperature - v od = v th ? v cc (l/m) . . . . . . . . . . . . . . . . . . . 8 figure 7. power-down reset delay vs. temperature - v od = v th ? v cc (r/s/t) . . . . . . . . . . . . . . . . . 9 figure 8. power-up t rec vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 figure 9. normalized reset threshold vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 10. max transient duration not causing reset pulse vs. reset comparator overdrive. . . . . . . . . 10 figure 11. ac testing input/output waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 12. sot23-3 ? 3-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . . 14
stm1001 description doc id 10373 rev 6 5/18 1 description the stm1001 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 ). figure 1. logic diagram table 1. signal names figure 2. connections v ss ground rst active-low reset output (open drain) v cc supply voltage ai09116 v cc stm1001 v ss rst ai09117 2 3 1 rst v cc v ss sot23-3
description stm1001 6/18 doc id 10373 rev 6 figure 3. block diagram 1. open drain figure 4. hardware hookup 1. rst output requires pull-up resistor. ai09118 compare v rst v cc t rec generator rst (1) ai09119 v cc v ss v cc mcu stm1001 rst (1) v cc v ss reset input (1)
stm1001 operation doc id 10373 rev 6 7/18 2 operation 2.1 reset output the stm1001 microprocessor reset circuit asserts a reset signal to the mcu whenever v cc goes below the reset threshold (v rst ). rst is guaranteed valid down to v cc =1 v (0 to 70 c). 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. the active-low reset (rst ) is an open drain output. 2.2 negative-going v cc transients the stm1001 is relatively immune to negative-going v cc transients (glitches). figure 10 on page 10 shows typical transient duration versus reset comparator overdrive (for which the stm1001 will not generate a re set pulse). the graph was generated usin g a negative pulse applied to v cc , starting at 0.5 v above the actual reset threshold and ending below it by the magnitude indicated (comparator 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. typically, a v cc transient that goes 100 mv below the reset threshold and lasts 20 s or less will not ca use a reset pulse. a 0. 1 f bypass capacitor mounted as close as possible to the v cc pin provides additional transient immunity.
typical operating characteristics stm1001 8/18 doc id 10373 rev 6 3 typical operating characteristics note: typical values are at t a = 25 c, v cc = 5 v for l/m versions, v cc = 3.3 v for t/s versions, and v cc = 3.0 v for r versions. figure 5. supply current vs. temperature, l/m/r/s/t (no load) figure 6. power-down reset delay vs. temperature - v od = v th ? v cc (l/m) ai07879 0.0 2.0 4.0 6.0 8.0 ?40 ?20 0 20 40 60 80 temperature (c) supply current (a) 1v 3v 3.6v 5.5v ai07880 0.00 20.00 40.00 60.00 80.00 100.00 120.00 140.00 ?40 ?20 0 20 40 60 80 temperature (c) power-down reset delay (s) v od = 20mv v od = 125mv v od = 200mv
stm1001 typical operating characteristics doc id 10373 rev 6 9/18 figure 7. power-down reset delay vs. temperature - v od = v th ? v cc (r/s/t) figure 8. power-up t rec vs. temperature note: valid for t rec = 210 ms (typ). ai07878 0.00 20.00 40.00 60.00 80.00 100.00 ?40 ?20 0 20 40 60 80 temperature (c) power-down reset delay (s) v od = 20mv v od = 125mv v od = 200mv 200.00 210.00 220.00 230.00 240.00 250.00 ?40 ?20 0 20 40 60 80 temperature (c) power-up t rec (ms) l/m r/s/t ai07881
typical operating characteristics stm1001 10/18 doc id 10373 rev 6 figure 9. normalized reset threshold vs. temperature figure 10. max transient duration not causing reset pulse vs. reset comparator overdrive ai07882 0.993 0.994 0.995 0.996 0.997 0.998 0.999 1.001 1.000 1.002 1.003 ?40 ?20 0 20 40 60 80 temperature (c) normalized treshold l/m r/s/t ai07883 0.00 100.00 200.00 300.00 400.00 500.00 600.00 700.00 1 10 100 1000 reset comparator overdrive, v rst ? v cc (mv) maximum transient duration (s) r/s/t l/m
stm1001 maximum ratings doc id 10373 rev 6 11/18 4 maximum ratings stressing the device above the rating listed in the absolute maximum ratings table 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 imp lied. exposure to absolute ma ximum 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 260 c. the time above 255 c must not exceed 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 stm1001 12/18 doc id 10373 rev 6 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. table 3. operating and ac measurement conditions figure 11. ac testing input/output waveforms parameter stm1001 unit v cc supply voltage 1.0 to 5.5 v ambient operating temperature (t a ) ?40 to 85 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 ai0256 8 0. 8 v cc 0.2v cc 0.7v cc 0. 3 v cc
stm1001 dc and ac parameters doc id 10373 rev 6 13/18 table 4. dc and ac characteristics sym description test condition (1) 1. valid for ambient operating temperature: t a = ?40 to 85 c; v cc = 1.2 v to 5.5 v (except where noted). min typ max unit v cc operating voltage t a = ?40 to +85 c 1.2 5.5 v t a = 0 to +70 c 1.0 5.5 v i cc v cc supply current v cc < 3.6 v 5.5 10 a v cc < 5.5 v 7 15 a i lo open drain reset output leakage current v cc > v rst , reset not asserted ?1 +1 a v ol rst output low voltage stm1001r/s/t only, i ol = 1.2 ma v cc = v rst (min) 0.3 v stm1001l/m only, i ol = 3.2 ma v cc = v rst (min) 0.4 v v ol rst output low voltage i ol = 50 a; v cc > 1.0 v 0.3 v reset thresholds v rst reset threshold stm1001l 25 c 4.56 4.63 4.70 v ?40 to 85 c 4.50 4.75 v stm1001m 25 c 4.31 4.38 4.45 v ?40 to 85 c 4.25 4.50 v stm1001t 25 c 3.04 3.08 3.11 v ?40 to 85 c 3.00 3.15 v stm1001s 25 c 2.89 2.93 2.96 v ?40 to 85 c 2.85 3.00 v stm1001r 25 c 2.59 2.63 2.66 v ?40 to 85 c 2.55 2.70 v v rst temperature coefficient v cc = 3.3 v 45 ppm/ c v cc to rst delay v cc = v rst to (v rst ? 100 mv) stm1001l/m 40 s stm1001r/s/t 20 s t rec rst pulse width option b (refer to table 6 )203040 ms option ?blank? (refer to table 6 ) 140 210 280
package mechanical data stm1001 14/18 doc id 10373 rev 6 6 package mechanical data 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. figure 12. sot23-3 ? 3-lead small outline transistor package outline note: drawing is not to scale. table 5. sot23-3 ? 3-lead small outline transistor package mechanical data sot23-3 0.10 c a a2 a1 3x c c l1 l c e1 d e 3x b e m 0.15 cab b e1 a m 0.20 c a b 1 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 0.30 0.50 0.012 0.020 c 0.08 0.20 0.003 0.008 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 e 0.89 1.03 0.035 0.041 e1 1.78 2.05 0.070 0.081 l 0.54 0.021 l1 0.40 0.60 0.016 0.024 q0808 n3 3
stm1001 part numbering doc id 10373 rev 6 15/18 7 part numbering table 6. ordering information scheme for other options, or for more information on any aspect of this device, please contact the st sales office nearest you. example: stm1001 s b wx 6 f device type stm1001 reset threshold voltage l = v rst = 4.50 v to 4.75 v m = v rst = 4.25 v to 4.50 v t = v rst = 3.00 v to 3.15 v s = v rst = 2.85 v to 3.00 v r = v rst = 2.55 v to 2.70 v rst pulse width (t rec ) b = 20 to 40 ms blank = 140 to 280 ms package wx = sot23-3 temperature range 6 = ?40 to 85 c shipping method f = ecopack ? package, tape & reel
part numbering stm1001 16/18 doc id 10373 rev 6 table 7. marking description part number reset threshol d output topside marking (1) 1. lowercase ?x? indicates date code. stm1001lwx6f 4.63 v open drain rst 8bax STM1001MWX6F 4.38 v open drain rst 8bbx stm1001twx6f 3.08 v open drain rst 8bcx stm1001swx6f 2.93 v open drain rst 8bdx stm1001rwx6f 2.63 v open drain rst 8bex stm1001sbwx6f 2.93 v open drain rst 8bmx
stm1001 revision history doc id 10373 rev 6 17/18 8 revision history table 8. document revision history date revision changes 09-dec-2003 1 first edition 19-feb-2004 2 part number changed from stm6301 22-mar-2004 2.1 update dc characteristics ( ta ble 4 ) 09-apr-2004 3 device promoted; reformatted; marking updated ( ta ble 7 ) 19-nov-2004 4 update dimensions ( table 5 ). 19-sep-2005 5 remove ?valid rst output down to v cc ...? text 17-feb-2010 6 updated features ; footnote in ta ble 2 ; table 4 ; table 6 ; table 7 ; text in section 6 ; added note to figure 8 ; reformatted document.
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