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1/22 june 2005 STM6321/6322 stm6821/6822/6823/6824/6825 5-pin supervisor with watchdog timer and push-button reset rev 4 features summary precision v cc monitoring of 5v, 3.3v, 3v, or 2.5v power supplies ? stm6xxxl ? stm6xxxm ? stm6xxxt ? stm6xxxs ? stm6xxxr ? stm6xxxz rst outputs (active-low, push-pull or open drain) rst outputs (active-high, push- pull) 200ms (typ) t rec watchdog timer - 1.6sec (typ) manual reset input (mr ) low supply current - 3a (typ) guaranteed rst (rst) assertion down to v cc = 1.0v operating temperature: ?40c to 85c (industrial grade) figure 1. package table 1. device options sot23-5 (wy) part number watchdog input manual reset input reset output active-low (push-pull) active-high (push-pull) active-low (open drain) STM6321 ??? stm6322 ??? stm6821 ?? ? stm6822 ?? ? stm6823 ??? stm6824 ??? stm6825 ???
STM6321/6322/ 6821/6822/6823/6824/6825 2/22 table of contents features summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 figure 1. package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 table 1. device options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 summary description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 figure 2. logic diagram (stm6821/6822/6823). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 figure 3. logic diagram (STM6321/6322/6824/6825) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 table 2. signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 figure 4. stm6821/6822/6823 sot23-5 connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 figure 5. STM6321/6322/6824/6825 sot23-5 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 active-low, push-pull reset output (rst ) - stm6822/6823/6824/6825 . . . . . . . . . . . . . . . . . . . . . 5 active-low, open drain reset output (rst ) - STM6321/6322/6822 . . . . . . . . . . . . . . . . . . . . . . . . 5 push-button reset input (mr ). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 watchdog input (wdi) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 active-high reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 table 3. pin functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 figure 6. block diagram (stm6xxx) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 figure 7. hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 open drain rst output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 figure 8. STM6321/6322/6822 open drain rst output with multiple supplies . . . . . . . . . . . . . . . 7 push-button reset input (stm6322/6821/6822/6823/6825) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 watchdog input (STM6321/6821/6822/6823/6824) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 applications information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 watchdog input current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 ensuring a valid reset output down to v cc = 0v . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 interfacing to microprocessors with bi-directional reset pins . . . . . . . . . . . . . . . . . . . . . . . . . 8 figure 9. ensuring rst valid to v cc = 0, (active-low push-pull outputs) . . . . . . . . . . . . . . . . . . . 8 figure 10.ensuring rst valid to v cc = 0, (active-high, push-pull outputs) . . . . . . . . . . . . . . . . . . 8 figure 11.interfacing to microprocessors with bi-directional reset i/o . . . . . . . . . . . . . . . . . . . . . . . 8 typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 figure 12.v cc -to-reset output delay vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 figure 13.supply current vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 figure 14.mr -to-reset output delay vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 15.normalized power-up t rec vs. temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 16.normalized reset threshold voltage vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 17.normalized power-up watchdog time-out period . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 18.voltage output low vs. i sink. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 19.voltage output high vs. i source. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3/22 STM6321/6322/68 21/6822/6823/6824/6825 figure 20.maximum transient duration vs. reset threshold overdrive. . . . . . . . . . . . . . . . . . . . . 13 maximum rating. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 table 4. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 dc and ac parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 table 5. operating and ac measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 figure 21.ac testing input/output waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 figure 22.mr timing waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 figure 23.watchdog timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 table 6. dc and ac characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 package mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 figure 24.sot23-5 ? 5-lead small outline transistor package mechanical drawing . . . . . . . . . . 18 table 7. sot23-5 ? 5-lead small outline transistor package mechanical data . . . . . . . . . . . . . 18 part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 table 8. ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 table 9. marking description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 table 10. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
STM6321/6322/ 6821/6822/6823/6824/6825 4/22 summary description the stm6xxx supervisors are self-contained de- vices which provide microprocessor supervisory functions. a precision voltage reference and com- parator monitors the v cc input for an out-of-toler- ance condition. when an invalid v cc condition occurs, the reset output (rst ) is forced low (or high in the case of rst). these devices also offer a watchdog timer (except for stm6322/6825) and/ or a push-button (mr ) reset input. these devices are available in a standard 5-pin sot23 package. figure 2. logic diagram (stm6821/6822/6823) note: 1. for stm6821 only. figure 3. logic diagram (STM6321/6322/6824/ 6825) note: 1. for STM6321/6824 table 2. signal names figure 4. stm6821/6822/6823 sot23-5 connections note: 1. push-pull only. 2. open drain for stm6822. figure 5. STM6321/6322/6824/6825 sot23-5 connections note: 1. open drain for STM6321/6322. 2. push-pull only. 3. for STM6321/6824 ai09128 v cc stm6xxx v ss rst (rst) (1) wdi mr ai09129 v cc stm6xxx v ss rst rst (wdi) (1) mr mr push-button reset input wdi watchdog input rst active-low reset output rst active-high reset output v cc supply voltage v ss ground 1 wdi rst (1) (rst) (2) v cc mr v ss ai09130 sot23-5 2 3 4 5 1 v cc v ss ai09131 sot23-5 2 3 4 5 mr (wdi) (3) rst (1) rst (2)
5/22 STM6321/6322/68 21/6822/6823/6824/6825 pin descriptions active-low, push-pull reset output (rst ) - stm6822/6823/6824/6825. pulses low when trig- gered, and stays low whenever v cc is below the reset threshold or when mr is a logic low. it re- mains low for t rec after either v cc rises above the reset threshold, the watchdog triggers a reset, or mr goes from low to high. active-low, open drain reset output (rst ) - STM6321/6322/6822. pulses low when triggered, and stays low whenever v cc is below the reset threshold or when mr is a logic low. it remains low for t rec after either v cc rises above the reset threshold, the watchdog triggers a reset, or mr goes from low to high. connect a pull-up resistor to supply voltage. push-button reset input (mr ). a logic low on mr asserts the reset output. reset remains as- serted as long as mr is low and for t rec after mr returns high. this active-low input has an internal 52k ? pull-up. it can be driven from a ttl or cmos logic line, or shorted to ground with a switch. leave open if unused. watchdog input (wdi). if wdi remains high or low for at least 1.6sec, the internal watchdog timer expires and reset is asserted. the internal watch- dog timer clears while reset is asserted or when wdi sees a rising or falling edge. the watchdog function can be disabled if wdi is left unconnect- ed or is connected to a tri-state buffer output. active-high reset output. active-high, push- pull reset output; inverse of rst . table 3. pin functions figure 6. block diagram (stm6xxx) note: 1. for STM6321/6821/6822/6823/6824 2. for stm6322/6821/6822/6823/6825 3. for stm6821/ (rst output only) 4. for STM6321/6322/6824/6825 (both rst and rst outputs) pin name function stm6822 stm6823 stm6821 STM6321 stm6824 stm6322 stm6825 1?11rst active-low reset output 33?4mr push-button reset input 4 4 4 ? wdi watchdog input ? 1 3 3 rst active-high reset output 5555 v cc supply voltage 2222 v ss ground ai09132 v rst rst (rst) (3) watchdog timer wdi transitional detector compare t rec generator v cc wdi (1) mr (2) rst (4) v cc
STM6321/6322/ 6821/6822/6823/6824/6825 6/22 figure 7. hardware hookup note: 1. for STM6321/6821/6822/6823/6824 2. for stm6322/6821/6822/6823/6825 3. for stm6821/ (rst output only) 4. for STM6321/6322/6824/6825 (both rst and rst outputs) ai09133 v cc v cc mr (2) 0.1 f stm6xxx wdi (1) rst (rst) (3) rst (4) to microprocessor reset from microprocessor push-button to microprocessor reset
7/22 STM6321/6322/68 21/6822/6823/6824/6825 operation reset output the stm6xxx supervisor asserts a reset signal to the mcu whenever v cc goes below the reset threshold (v rst ), a watchdog time-out occurs, or when the push-button reset input (mr ) is taken low. reset is guaranteed valid for v cc < v rst down to v cc =1v for t a = 0c to 85c. during power-up, once v cc exceeds the reset threshold an internal timer keeps reset low for the reset time-out period, t rec . after this interval reset is de-asserted. each time rst is asserted, it stays low for at least the reset time-out period (t rec ). 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. open drain rst output the STM6321/6322/6822 have an active-low, open drain reset output. this output structure will sink current when rst is asserted. connect a pull- up resistor from rst to any supply voltage up to 6v (see figure 8. ). select a resistor value large enough to register a logic low, and small enough to register a logic high while supplying all input cur- rent and leakage paths connected to the reset out- put line. a 10k ? pull-up resistor is sufficient in most applications. figure 8. STM6321/6322/6822 open drain rst output with multiple supplies note: 1. stm6322/6822 2. STM6321/6822 3. STM6321/6322 push-button reset input (stm6322/6821/6822/ 6823/6825) a logic low on mr asserts reset. reset remains asserted while mr is low, and for t rec (see figure 22., page 15 ) after it returns high. the mr input has an internal 52k ? pull-up resistor, 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 normally open mo- mentary switch from mr to gnd to create a man- ual reset function; external debounce circuitry is not required. if mr is driven from long cables or the device is used in a noisy environment, connect a 0.1f capacitor from mr to gnd to provide ad- ditional noise immunity. mr may float, or be tied to v cc when not used. watchdog input (STM6321/6821/6822/6823/ 6824) the watchdog timer can be used to detect an out- of-control mcu. if the mcu does not toggle the watchdog input (wdi) within t wd (1.6sec), the re- set is asserted. the internal watchdog timer is cleared by either: 1. a reset pulse, or 2. by toggling wdi (high-to-low or low-to-high), which can detect pulses as short as 50ns. the timer remains cleared and does not count for as long as reset is asserted. as soon as reset is re- leased, the timer starts counting. note: the watchdog function may be disabled by floating wdi or tri-stating the driver connected to wdi. when tri-stated or disconnected, the maxi- mum allowable leakage current is 10ua and the maximum allowable load capacitance is 200pf. applications information watchdog input current. the wdi input is inter- nally driven through a buffer and series resistor from the watchdog counter. for minimum watch- dog input current (minimum overall power con- sumption), leave wdi low for the majority of the watchdog time-out period. when high, wdi can draw as much as 160a. pulsing wdi high at a low duty cycle w ill reduce t he effect of the large in- put current. when wdi is left unconnected, the watchdog timer is serviced within the watchdog time-out period by a low-high-low pulse from the counter chain. ai09137 stm6xxx rst mr (1) wdi (2) rst (3) gnd 10k v cc 5v system 5.0v 3.3v
STM6321/6322/ 6821/6822/6823/6824/6825 8/22 ensuring a valid reset output down to v cc =0v. the stm6xxx supervisors are guaran- teed to operate properly down to v cc = 1v. in ap- plications that require valid reset levels down to v cc = 0, a pull-down resistor to active-low outputs (push/pull only, see figure 9. ) and a pull-up resis- tor to active-high outputs (push/pull only, see fig- ure 10. ) will ensure that the reset line is valid while the reset output can no longer sink or source cur- rent. this scheme does not work with the open drain outputs of the STM6321/6322/6822. the resistor value used is not critical, but it must be large enough not to load the reset output when v cc is above the reset threshold. for most appli- cations, 100k ? is adequate. interfacing to microprocessors with bi- directional reset pins microprocessors with bi-directional reset pins can contend with the STM6321/6322/6821/6822/6823/ 6824/6825 reset output. for example, if the reset output is driven high and the microprocessor wants to pull it low, signal contention will result. to prevent this from occurring, connect a 4.7k ? resis- tor between the reset output and the microproces- sor?s reset i/o as in figure 11. . figure 9. ensuring rst valid to v cc = 0, (active-low push-pull outputs) figure 10. ensuring rst valid to v cc = 0, (active-high, push-pull outputs) note: this configuration does not work on open drain outputs of the STM6321/6322/6822. figure 11. interfacing to microprocessors with bi-directional reset i/o ai09138 stm6xxx rst gnd v cc v cc r1 ai09139 stm6xxx rst gnd v cc v cc r1 ai09135 stm6xxx rst gnd 4.7k v cc microprocessor rst buffered reset to other system components gnd v cc
9/22 STM6321/6322/68 21/6822/6823/6824/6825 typical operating characteristics figure 12. v cc -to-reset output delay vs. temperature figure 13. supply current vs. temperature temperature (?c) reset output delay (?) ai09627a 0 5 10 15 20 25 30 35 ?40 ?20 0 20 40 60 80 temperature (?c) supply current (?) v cc = 3v v cc = 5v ai09628a 0 1 2 3 4 5 6 7 ?40 ?20 0 20 40 60 80
STM6321/6322/ 6821/6822/6823/6824/6825 10/22 figure 14. mr -to-reset output delay vs. temperature figure 15. normalized power-up t rec vs. temperature temperature (?c) reset output delay (ns) ai09669 0 100 200 300 400 500 600 ?40 ?20 0 20 40 60 80 temperature (?c) normalized power-up t rec ai09670 0.99 1.00 1.01 1.02 1.03 1.04 1.05 ?40 ?20 0 20 40 60 80
11/22 STM6321/6322/68 21/6822/6823/6824/6825 figure 16. normalized reset threshold voltage vs. temperature figure 17. normalized power-up watchdog time-out period temperature (?c) normalized reset threshold voltage ai09631a 0.95 0.96 0.97 0.98 0.99 1.00 1.01 1.02 1.03 1.04 1.05 ?40 ?20 0 20 40 60 80 temperature (?c) normalized watchdog time-out period ai09671 0.99 1.00 1.01 1.02 1.03 1.04 1.05 ?40 ?20 0 20 40 60 80
STM6321/6322/ 6821/6822/6823/6824/6825 12/22 figure 18. voltage output low vs. i sink figure 19. voltage output high vs. i source i sink (ma) v out (v) v cc = 2.9v ai09634a 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0123456 i source (ma) v out (v) ai09635a 2.74 2.76 2.78 2.80 2.82 2.84 2.86 2.88 2.90 2.92 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 v cc = 2.9v
13/22 STM6321/6322/68 21/6822/6823/6824/6825 figure 20. maximum transient duration vs. reset threshold overdrive reset threshold overdrive (mv) transient duration (?) ai09637a 0 5 10 15 20 25 30 35 0 20 40 60 80 100 120 140 160 180 200 s z l
STM6321/6322/ 6821/6822/6823/6824/6825 14/22 maximum rating stressing the device above the rating listed in the absolute maximum ratings? table may cause per- manent 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 im- plied. exposure to absolute maximum rating con- ditions for extended periods may affect device reliability. refer also to the stmicroelectronics sure program and other relevant quality docu- ments. table 4. absolute maximum ratings note: 1. reflow at peak temperature of 255c to 260c for < 30 seconds (total thermal budget not to exceed 180c for between 90 t o 150 seconds). symbol parameter value unit t stg storage temperature (v cc off) ?55 to 150 c t sld (1) 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
15/22 STM6321/6322/68 21/6822/6823/6824/6825 dc and ac parameters this section summarizes the operating measure- ment conditions, and the dc and ac characteris- tics 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 5. , 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 5. operating and ac measurement conditions figure 21. ac testing input/output waveforms figure 22. mr timing waveform note: 1. rst for stm6322/6821/6825. figure 23. watchdog timing parameter stm6xxx 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 0.8v cc v input and output timing ref. voltages 0.3 to 0.7v cc v ai02568 0.8v cc 0.2v cc 0.7v cc 0.3v cc ai07837a rst (1) mr tmlrl trec tmlmh ai09136 rst wdi v cc trec twd
STM6321/6322/ 6821/6822/6823/6824/6825 16/22 table 6. dc and ac characteristics sym alter- native description test condition (1) min typ max unit v cc operating voltage 1.2 (2) 5.5 v i cc v cc supply current (mr and wdi unconnected) t/s/r/z (v cc < 3.6v) 412a l/m (v cc < 5.5v) 617a v cc supply current (mr unconnected; stm6322/6825) t/s/r/z (v cc < 3.6v) 38a l/m (v cc < 5.5v) 312a i li input leakage current 0v = v in = v cc ?1 +1 a input leakage current (wdi) (3) wdi = v cc , time average 120 160 a wdi = gnd, time average ?20 ?15 a i lo open drain reset output leakage current v cc > v rst , reset not asserted ?1 +1 a v ih input high voltage (mr ) v rst > 4.0v 2.0 v v rst < 4.0v 0.7v cc v v ih input high voltage (wdi) (4) v rst (max) < v cc < 5.5v 0.7v cc v v il input low voltage (mr ) v rst > 4.0v 0.8 v v rst < 4.0v 0.3v cc v v il input low voltage (wdi) (4) v rst (max) < v cc < 5.5v 0.3v cc v v ol output low voltage (rst ; push-pull or open drain) v cc 1.0v, i sink = 50a, reset asserted 0.3 v v cc 1.2v, i sink = 100a, reset asserted 0.3 v v cc 2.7v, i sink = 1.2ma, reset asserted 0.3 v v cc 4.5v, i sink = 3.2ma, reset asserted 0.4 v output low voltage (rst; push-pull only) v cc 2.7v, i sink = 1.2ma, reset not asserted 0.3 v v cc 4.5v, i sink = 3.2ma, reset not asserted 0.4 v v oh output high voltage (rst ) v cc 2.7v, i source = 500a, reset not asserted 0.8v cc v v cc 4.5v, i source = 800a , reset not asserted 0.8v cc v output high voltage (rst) v cc 1.0v, i source = 1a, reset asserted (0c to 85c) 0.8v cc v v cc 1.5v, i source = 100a, reset asserted 0.8v cc v v cc 2.55v, i source = 500a, reset asserted 0.8v cc v v cc 4.25v, i source = 800a, reset asserted 0.8v cc v
17/22 STM6321/6322/68 21/6822/6823/6824/6825 note: 1. valid for ambient operating temperature: t a = ?40 to 85c; v cc = 4.5v to 5.5v for ?l/m? versions; v cc = 2.7v to 3.6v for ?t/s/r? versions; and vcc = 2.1v to 2.75v for ?z? version (except where noted). 2. v cc (min) = 1.0v for t a = 0c to +85c. 3. wdi input is designed to be driven by a three-state output device. to float wdi, the ?high-impedance mode? of the output devi ce must have a maximum leakage current of 10a and a maximum output capacitance of 200pf. the output device must also be able to source and sink at least 200a when active. 4. wdi is internally serviced within the watchdog period if wdi is left unconnected. 5. the leakage current measured on the rst pin is tested with the reset asserted (output high impedance). 6. contact local sales office for availability. reset thresholds v rst (5) reset threshold stm6xxxl 25c 4.561 4.630 4.699 v ?40 to 85c 4.514 4.746 v stm6xxxm 25c 4.314 4.390 4.446 v ?40 to 85c 4.270 4.490 v stm6xxxt 25c 3.040 3.080 3.110 v ?40 to 85c 3.000 3.150 v stm6xxxs 25c 2.890 2.930 2.960 v ?40 to 85c 2.857 3.000 v stm6xxxr 25c 2.590 2.630 2.660 v ?40 to 85c 2.564 2.696 v stm6xxxz (6) 25c 2.280 2.320 2.350 v ?40 to 85c 2.250 2.380 v reset threshold hysteresis l/m versions 10 mv t/s/r/z versions 5 mv v cc to rst delay (v rst ? v cc = 100mv, v cc falling at 1mv/s) 20 s t rec reset pulse width 140 200 280 ms reset threshold temperature coefficient 40 ppm/ c push-button reset input t mlmh t mr mr pulse width 1 s t mlrl t mrd mr to rst output delay 500 ns mr glitch immunity 100 ns mr pull-up resistor 35 52 75 k ? watchdog timer t wd watchdog timeout period 1.12 1.60 2.24 s wdi pulse width 50 ns sym alter- native description test condition (1) min typ max unit
STM6321/6322/ 6821/6822/6823/6824/6825 18/22 package mechanical figure 24. sot23-5 5-lead small outline transistor package mechanical drawing note: drawing is not to scale. table 7. sot23-5 ?5-lead small outline transistor package mechanical data symb mm inches typ min max typ min max a 1.20 0.90 1.45 0.047 0.035 0.057 a1 ? ? 0.15 ? ? 0.006 a2 1.05 0.90 1.30 0.041 0.035 0.051 b 0.40 0.35 0.50 0.016 0.014 0.020 c 0.15 0.09 0.20 0.006 0.004 0.008 d 2.90 2.80 3.00 0.114 0.110 0.118 e 2.80 2.60 3.00 0.110 0.102 0.118 e1 1.60 1.50 1.75 0.063 0.059 0.069 e1.90? ?0.075? ? e/2 0.95 ? ? 0.037 ? ? l 0.60 0.55 0.63 0.024 0.022 0.025 l1 0.35 0.10 0.60 0.014 0.004 0.024 ? 0 10 ? 0 10 n5 5 sot23-5b 0.10 c a a2 a1 4x c d e e/2 e m 0.15 cab b e1 a m cab 5x b 0.20 c l1 l c
19/22 STM6321/6322/68 21/6822/6823/6824/6825 part numbering table 8. ordering information scheme note: 1. contact local sales office for availability. for other options, or for more information on any aspect of this device, please contact the st sales office nearest you. example: stm6xxx l m 6 e device type stm6xxx reset threshold voltage l: v rst = 4.514v to 4.746v m: v rst = 4.270v to 4.490v t: v rst = 3.000v to 3.150v s: v rst = 2.850v to 3.000v r: v rst = 2.564v to 2.696v z: v rst = 2.250v to 2.380v (1) package wy = sot23-5 temperature range 6 = ?40 to 85c shipping method e = tubes f = tape & reel
STM6321/6322/ 6821/6822/6823/6824/6825 20/22 table 9. marking description note: 1. where ?x? = assembly work week (a to z), such that ?a? = ww01-02, ?b? = ww03-04, and so forth. part number topside marking STM6321lwy6f 5aux STM6321mwy6f 5avx STM6321twy6f 5awx STM6321swy6f 5axx STM6321rwy6f 5ayx STM6321zwy6f 5azx stm6322lwy6f 5bax stm6322mwy6f 5bbx stm6322twy6f 5bcx stm6322swy6f 5bdx stm6322rwy6f 5bex stm6322zwy6f 5bfx stm6821lwy6f 5bgx stm6821mwy6f 5bhx stm6821twy6f 5bjx stm6821swy6f 5bkx stm6821rwy6f 5blx stm6821zwy6f 5bmx stm6822lwy6f 5bnx stm6822mwy6f 5bpx stm6822twy6f 5bqx stm6822swy6f 5brx stm6822rwy6f 5bsx stm6822zwy6f 5btx stm6823lwy6f 5bux stm6823mwy6f 5bvx stm6823twy6f 5bwx stm6823swy6f 5bxx stm6823rwy6f 5byx stm6823zwy6f 5bzx stm6824lwy6f 5cax stm6824mwy6f 5cbx stm6824twy6f 5ccx stm6824swy6f 5cdx stm6824rwy6f 5cex stm6824zwy6f 5cfx stm6825lwy6f 5cgx stm6825mwy6f 5chx stm6825twy6f 5cjx stm6825swy6f 5ckx stm6825rwy6f 5clx stm6825zwy6f 5cmx
21/22 STM6321/6322/68 21/6822/6823/6824/6825 revision history table 10. document revision history date version revision details august 25, 2004 1.0 first draft 15-dec-04 2.0 update characteristics (figure 12 , 13 , 14 ; table 6 , 8 ) 10-mar-05 3.0 document promoted to datasheet status 17-jun-05 4 package marking update (table 9 )
STM6321/6322/ 6821/6822/6823/6824/6825 22/22 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the co nsequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of stmicroelectronics. specifications mentioned in this publicati on are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics prod ucts are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectro nics. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners ? 2005 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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