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CAT823, cat824, cat825 ? catalyst semiconductor, inc. 1 doc. no. md-3027, rev. b characteristics subject to change without notice system supervisory voltage reset with watchdog and manual reset features ? automatically restarts microprocessor after power failure ? monitors pushbutton for external override ? accurate under voltage system monitoring ? brownout detection system reset for use with 3.0, 3.3, and 5.0 volt systems ? pin and function compatible with the max823/24/25 products ? operating range from -40c to +85c ? available in tsot-23 5-lead and sc-70 packages for ordering information details, see page 13. applications ? microprocessor and microcontroller based systems ? intelligent instruments ? control systems ? critical p monitors ? portable equipment description the CAT823, cat824, and cat825 provide basic reset and monitoring functions for the electronic systems. each device monitors the system voltage and maintains a reset output until that voltage reaches the device?s specified trip value and then maintains the reset output active condition until the device?s internal timer, after a minimum timer of 140ms; to allow the systems power supply to stabilize. the CAT823 and cat824 also have a watchdog input which can be used to monitor a system signal and cause a reset to be issued if the signal fails to change state prior to a timeout condition. the CAT823 and cat825 also provide a manual reset input which can be used to initiate reset if pulled low. this input can be directly attached to a push- button or a processor signal. pin configuration tsot-23 5-lead sc-70 5-lead pin functions pin name function reset cmos push-pull active low reset output gnd ground mr manual reset input ? pulled high internally by a 52k ? resistor designed to be driven low by a mechanical pushbutton, open drain output or cmos output. reset cmos push-pull active high reset output wdi watchdog timer input ? designed to be driven by a processor output or can be disabled by tri-stating or leaving open. v cc power supply vcc CAT823 mr 2 3 1 wdi 5 4 reset gnd reset mr vcc cat824 reset 2 3 1 wdi 5 4 reset gnd vcc cat825 reset 2 3 15 4 gnd
CAT823, cat824, cat825 doc. no. md-3027, rev. b 2 ? catalyst semiconductor, inc. characteristics subject to change without notice block diagram device reset reset mr wdi CAT823 x x x cat824 x x x cat825 x x x v cc reset* v cc w di* v cc v cc reset + ? digital delay level sense & debounce level sense & timer v cc tolerance bias voltage reference 52k ? mr* * functions available by device timeout comparator
CAT823, cat824, cat825 ? catalyst semiconductor, inc. 3 doc. no. md-3027, rev. b characteristics subject to change without notice absolute maximum ratings (1) parameters ratings units supply voltage 6 v all other pins -0.3 to (v cc + 0.3) v input current, v cc 20 ma output current rst, rst 20 ma continuous power dissipations (t a = +70oc) sc-70 5-lead (derate 3.1mw/oc above +70oc) 247 mw tsot-23 5-lead (derate 7.1mw/oc above +70oc) 571 mw storage temperature -65 to 150 oc operating ambient temperature -40 to +85 oc lead soldering (10 seconds max) +300 oc esd rating: low voltage pins human body model 2000 v machine model 200 v recommended operating conditions parameter range units v cc (t a = 0oc to +70oc) 1.0 to 5.5 v v cc (t a = -40oc to +85oc) 1.2 to 5.5 v all other pins -0.1 to (v cc + 0.1) v ambient temperature -40 to +85 oc notes: (1) stresses above those listed under ?absolut e maximum ratings? may cause permanent dam age to the device. these are stress rat ings only, and functional operation of the device at these or any ot her conditions outside of those lis ted in the operational sectio ns of this specification is not implied. exposure to any absolute maximum rating for extended pe riods may affect device performance and re liability.
CAT823, cat824, cat825 doc. no. md-3027 rev. b 4 ? catalyst semiconductor, inc. characteristics subject to change without notice electrical operatin g characteristics dc characteristics: v cc = 3.0v to 5.5v for l/m versions; v cc = 2.0v to 3.6v for the r/s/t/y/z version, -40oc t a +85oc unless otherwise noted. typical values at t a = 25oc and v cc = 5v for l/m versions; v cc = 3.3v for the t/s versions; v cc = 3.0v for the r version; and v cc = 2.5v for the y/z versions. (1) symbol parameter conditions min typ max units CAT823 (l/m versions) cat824 (l/m versions) 6 17 a CAT823 (r/s/t/y/z versions) cat824 (r/s/t/y/z versions) 4 12 a cat825 (l/m versions) 3 8 a i cc supply current cat825 (r/s/t/y/z versions) 2 6 a cat82_l at -40oc t a +85oc 4.50 4.63 4.75 v cat82_m at -40oc t a +85oc 4.25 4.38 4.50 v cat82_t at -40oc t a +85oc 3.00 3.08 3.15 v cat82_s at -40oc t a +85oc 2.85 2.93 3.00 v cat82_r at -40oc t a +85oc 2.55 2.63 2.70 v cat82_z at -40oc t a +85oc 2.25 2.32 2.38 v v rst reset threshold cat82_y at -40oc t a +85oc 2.13 2.19 2.25 v reset threshold tempco 40 ppm/oc cat82_l/m 10 mv reset threshold hysteresis cat82_r/s/t/y/z 5 mv t rd v cc to reset delay (2) v cc = v th to (v th - 100mv) 20 s t rp reset active timeout period 140 200 400 ms cat82_l/m, v cc = v rst max , i source = -120a v cc - 1.5v v oh reset output high voltage cat82_t/s/r/z/y, v cc = v rst max , i source = -30a 0.8 x v cc cat82_l/m, v cc = v rst min , i sink = 3.2ma 0.4 cat82_t/s/r/z/y, v cc = v rst min , i sink = 1.2ma 0.3 t a = 0oc to +70oc, v cc = 1v, v cc falling, i sink = 50a 0.3 v ol reset output low voltage t a = t min to t max , v cc = 1.2v, v cc falling, i sink = 100a 0.3 v cat82_l/m, reset = 0v, v cc = 5.5v 1.5 i source reset output short-circuit current cat82_l/m, reset = 0v, v cc = 3.6v 0.8 ma v oh v cc > 1.8v, i source = -150a 0.8 x v cc cat824l/m & cat825l/m, v cc = v rst max , i sink = 3.2ma 0.4 v ol reset output voltage cat824r/s/t/y/z & cat825r/s/t/y/z, v cc = v rst max , i sink = 1.2ma 0.3 v notes: (1) over-temperature limits are guaranteed by design and not production tested. (2) the reset short-circuit current is the maximum pull-up current when reset is driven low by a bidirectional output.
CAT823, cat824, cat825 ? catalyst semiconductor, inc. 5 doc. no. md-3027, rev. b characteristics subject to change without notice electrical operating char acteristics (continued) dc characteristics: v cc = 3.0v to 5.5v for l/m versions; v cc = 2.0v to 3.6v for the r/s/t/y/z version, -40oc t a +85oc unless otherwise noted. typical values at t a = 25oc and v cc = 5v for l/m versions; v cc = 3.3v for the t/s versions; v cc = 3.0v for the r version; and v cc = 2.5v for the y/z versions. symbol parameter conditions min typ max units watchdog input (CAT823 & cat824) t wd watchdog timeout period 1.12 1.60 3.20 s t wdi wdi pulse width v il = 0.4v, v ih = 0.8 x v cc 50 ns v il 0.3 x v cc v ih wdi input voltage (3) 0.7 x v cc v wdi = v cc , time average 120 160 wdi input current (4) wdi = 0v, time average -20 -15 a manual reset input(CAT823 & cat825) v il 0.3 x v cc v ih mr input voltage 0.7 x v cc v t pb mr pulse width 1 s t pdly mr low to reset delay 5 s mr noise immunity pulse width with no reset 100 ns mr pullup resistance (internal) 35 52 75 k ? notes: (3) wdi is internally serviced within the watchdog period if wdi is left open. (4) the wdi input current is specified as an average input current when the wdi input is driven high or low. the wdi input if connected to a three-stated output device can be disabled in the tristate mode as long as the l eakage current is less than 10a and a maximum capacitance of less than 200pf. to clock the wdi input in the acti ve mode the drive device must be able to source or sink at l east 200a when active.
CAT823, cat824, cat825 doc. no. md-3027 rev. b 6 ? catalyst semiconductor, inc. characteristics subject to change without notice typical electrical operat ing characteristics tables v cc supply current vs. temperature normalized reset threshold voltage vs. temperature 0.94 0.96 0.98 1.00 1.02 1.04 1.06 -40 -20 0 20 40 60 80 100 t em p era t ure ( o c ) normalized reset threshold (v) temperature (c) 1 2 3 4 5 6 7 8 9 -40 -20 0 20 40 60 80 100 120 t em pera t ure ( o c ) supply current (a
CAT823, cat824, cat825 ? catalyst semiconductor, inc. 7 doc. no. md-3027, rev. b characteristics subject to change without notice functional description processor reset the CAT823-825 detect supply voltage (v cc ) conditions that are below the specified voltage trip value (v rst ) and provide a reset output to maintain correct system operation. on power-up, reset (and reset if available) are kept active for a minimum delay t rp of 140ms after the supply voltage (v cc ) rises above v rst to allow the power supply and processor to stabilize. when v cc drops below the voltage trip value (v rst ), the reset output signals reset (and reset) are pulled active. reset (and reset if available) is specifically designed to provide the reset input signals for processors. this provides reliable and consistent operation as power is turned on, off or during brownout conditions by maintaining the processor operation in known conditions. manual reset the CAT823 and cat825 each have a manual reset (mr ) input to allow for alternative control of the reset outputs. the mr input is designed for direct con- nection to a pushbutton (see figure 1). the mr input is internally pulled up by 52k ? resistor and must be pulled low to cause the reset outputs to go active. internally, this input is debounced and timed such that reset (and reset) signals of at least 140ms minimum will be generated. the min 140ms t rp delay commences as the manual reset input is released from the low level. (see figure 2) figure 1. pushbutton reset figure 2. timing diagram ? pushbutton reset v il v ih v oh t rp t pdly t pb v ol reset reset mr reset cat825 v cc reset gnd mr supply voltage
CAT823, cat824, cat825 doc. no. md-3027 rev. b 8 ? catalyst semiconductor, inc. characteristics subject to change without notice watchdog timer the CAT823 and cat824 provide a watchdog input (wdi). the watchdog timer function forces reset (and reset in the cat824) signals active when the wdi input does not have a transition from low-to-high or high-to-low within 1.12 seconds. timeout of the watchdog starts when reset (reset on the cat824) becomes inactive. if a transition occurs on the wdi input pin prior to the watchdog time-out, the watchdog timer is reset and begins to time-out again. if the watchdog timer is allo wed to time-out, then the reset output(s) will go active for t rp and once released will repeat the watchdog timeout process. figure 3 below shows a typi cal implementation of a watchdog function. any processor signal that repeats dependant on the normal operation of the processor or directed by the softwar e operating on the processor can be used to strobe the watchdog input. the most reliable is a dedicated i/o output transitioned by a specific software instruction. the watchdog can be disabled by floating (or tri- stating) the wdi input (see figure 4). if the watchdog is disabled the wdi pin will be pulled low for the first 7/8 th ?s of the watchdog period (t wd ) and pulled high for the last 1/8 th of the watchdog period. this pulling low of the wdi input and then high is used to detect an open or tri-state condition and will continue to repeat until the wdi input is driven high or low. for most efficient operation of devices with the watchdog function the wdi input should be held low the majority of the time and only strobed high as required to reset the watchdog timer. figure 3. watchdog timer figure 4. watchdog disable circuit reset CAT823 pic c decoder address v cc gnd wdi mr mclr supply voltage c output v cc tristate 150k ? 110k ? reset CAT823 v cc gnd wdi mr
CAT823, cat824, cat825 ? catalyst semiconductor, inc. 9 doc. no. md-3027, rev. b characteristics subject to change without notice figure 5. timing diagram ? strobe input figure 6. timing diagram ? power down figure 7. timing diagram ? power up v cc v rst (max) v rst (min) v rst v oh v ol t rd reset reset (cat824 & cat825) reset slews with v cc v cc v rst (max) v rst (min) v rst v oh v ol t rp reset reset (cat824 & cat825 ) reset wdi invalid strobe valid strobe min. max. indeterminate strobe t wd reset
CAT823, cat824, cat825 doc. no. md-3027 rev. b 10 ? catalyst semiconductor, inc. characteristics subject to change without notice application notes p?s with bidirectional reset pins the reset output can be pulled low by processors like the 68hc11 allowing for a system reset issued by the processor. the maximum pullup current that can be sourced by the cat82_l/m is 1.5ma (and by the cat82_t/r/s/z/y is 800a) allowing the processor to pull the output low even when the cat82x is pulling it high. power transients generally short duration negative-going transients of less than 2s on the power supply at v rst minimum will not cause a reset condi tion. however the lower the voltage of the transient the shorter the required time to cause a reset output. these issues can usually be remedied by the proper location of bypass capacitance on the circuit board. output valid conditions the reset output uses a push-pull output which can maintain a valid output down to a v cc of 1.0 volts. to sink current below 0.8v a resistor can be connected from reset to ground (see figure 8.) this arrangement will maintain a valid value on the reset output during both power up and down but will draw current when the reset output is in the high state. a resistor value of about 100k ? ? should be adequate in most situations to maintain a low condition valid output down to v cc equal to 0v. figure 8. reset valid to 0 volts v cc 100k ? CAT823 v cc gnd wdi mr c reset reset
CAT823, cat824, cat825 ? catalyst semiconductor, inc. 11 doc. no. md-3027, rev. b characteristics subject to change without notice package outline drawing tsot-23 5-lead (td) (1)(2) notes: (1) all dimensions in millimeters. angles in degrees. (2) complies with jedec standard mo-193. for current tape and reel information, download the pdf file from: http://www.catsemi.com/documents/tapeandreel.pdf. e1 e a2 a1 e b d c a top view side view end view l1 l l2 symbol min nom max a1.00 a1 0.01 0.05 0.10 a2 0.80 0.87 0.90 b 0.30 0.45 c 0.12 0.15 0.20 d 2.90 bsc e 2.80 bsc e1 1.60 bsc e0.95typ l 0.30 0.40 0.50 l1 0.60 ref l2 0.25 bsc 0o 8o
CAT823, cat824, cat825 doc. no. md-3027 rev. b 12 ? catalyst semiconductor, inc. characteristics subject to change without notice sc-70 5-lead (sd) (1)(2) notes: (1) all dimensions in millimeters. angles in degrees. (2) complies with jedec mo-203. for current tape and reel information, download the pdf file from: http://www.catsemi.com/documents/tapeandreel.pdf. e1 e d a l l1 l2 ee b a1 a2 c top view side view end view 1 1 symbol min nom max a0.80 1.10 a1 0.00 0.10 a2 0.80 1.00 b0.15 0.30 c0.10 0.18 d 1.80 2.00 2.20 e 1.80 2.10 2.40 e1 1.15 1.25 1.35 e 0.65 bsc l 0.26 0.36 0.46 l1 0.42 ref l2 0.15 bsc 0 8 14 10
CAT823, cat824, cat825 ? catalyst semiconductor, inc. 13 doc. no. md-3027, rev. b characteristics subject to change without notice example of ordering information (1) top marking informatio n (for all thresholds) device # package top marking CAT823 tsot-23 ts cat824 tsot-23 tb cat825 tsot-23 td CAT823 sc-70 rg cat824 sc-70 tb cat825 sc-70 td ordering part number CAT823ltdi-g cat824ltdi-g (4) cat825ltdi-g CAT823mtdi-g cat824mtdi-g (4) cat825mtdi-g CAT823ttdi-g cat824ttdi-g (4) cat825ttdi-g CAT823stdi-g cat824tsdi-g (4) cat825stdi-g CAT823rtdi-g cat824rtdi-g (4) cat825rtdi-g CAT823ztdi-g cat824ztdi-g (4) cat825ztdi-g CAT823ytdi-g cat824ytdi-g (4) cat825ytdi-g CAT823lsdi-g cat824lsdi-g (4) cat825lsdi-g CAT823msdi-g cat824msdi-g (4) cat825msdi-g CAT823tsdi-g cat824tsdi-g (4) cat825tsdi-g CAT823ssdi-g cat824ssdi-g (4) cat825sdi-g CAT823rsdi-g cat824rsdi-g (4) cat825rsdi-g CAT823zsdi-g cat824zsdi-g (4) cat825zsdi-g CAT823ysdi-g cat824ysdi-g (4) cat825ysdi-g notes: (1) all packages are rohs-compliant (lead-free, halogen-free). (2) the standard lead finish is nipdau. (3) this device used in the above example is a CAT823ltdi -gt3 (4.63v, tsot-23 5-lead, industrial temperature, nipdau, tape & reel, 3,000/reel, (4) contact factory for package availability. prefix device # suffix cat 823 l td i -g t3 optional company id package td: tsot-23 5-lead sd: sc-70 5-lead temperature range i = in dustrial (- 40oc to 85oc) reset threshold voltage l: 4.63v m: 4.38v t: 3.08v s: 2.93v r: 2.63v z: 2.32v y: 2.19v product number 823 824 825 tape & reel t: tape & reel 3: 3,000 / reel lead finish g:nipdau
revision history date rev. reason 10-sep-07 a initial release 23-may-08 b update package outline drawings update top mark information catalyst semiconductor, inc. corporate headquarters 2975 stender way santa clara, ca 95054 phone: 408.542.1000 document no: md-3027 fax: 408.542.1200 revision: b www.catsemi.com issue date: 05/23/08 copyrights, trademarks and patents ? catalyst semiconductor, inc. trademarks and register ed trademarks of catalyst semiconductor include each of the following: adaptive analog?, beyond memory?, dpp?, ezdim?, ldd?, minipot?, quad-mode? and quant um charge programmable? catalyst semiconductor has been issued u. s. and foreign patents and has patent applicat ions pending that protect its products. catalyst semiconductor makes no warranty, representation or guar antee, express or implied, regarding the suitability of its products for any particular purpose, nor that the use of its pro ducts will not infringe its intellectual property rights or the rights of third parties with respect to any particular use or application and specifically disclaims any and all liability aris ing out of any such use or application, including but not limited to, consequential or incidental damages. catalyst semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgica l implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the catalyst semiconduct or product could create a situation where personal injury or death may occur. catalyst semiconductor reserves the right to make changes to or discontinue any produ ct or service descr ibed herein without not ice. products with data sheets labeled "advance information" or "preliminary" and other products described herein may not be in pr oduction or offered for sale. catalyst semiconductor advises customers to obtain the current version of the rele vant product informati on before placing order s. circuit diagrams illustrate typical semiconductor applications and may not be complete.

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