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1 cat811, cat812 4-pin microprocessor power supply supervisors features precision monitoring of +5.0 v (+/- 5%, +/- 10%, +/- 20%), +3.3 v (+/- 5%, +/ 10%), +3.0 v (+/- 10%) and +2.5 v (+/- 5%) power supplies offered in two output configurations: - cat811: active low reset - cat812: active high reset manual reset input direct replacements for the max811 and max812 in applications operating over the industrial temperature range reset valid down to v cc = 1.0 v 6 a power supply current power supply transient immunity compact 4-pin sot143 package industrial temperature range: -40?c to +85?c ?2004 by catalyst semiconductor, inc., patent pending characteristics subject to change without notice doc. no. 3005, rev. p applications computers servers laptops cable modems wireless communications embedded control systems white goods power meters intelligent instruments pdas and handheld equipment description the cat811 and cat812 are p supervisory circuits that monitor power supplies in digital systems. the cat811 and cat812 are direct replacements for the max811 and max812 in applications operating over the industrial temperature range; both have a manual reset input. these devices generate a reset signal, which is asserted while the power supply voltage is below a preset threshold level and for at least 140 ms after the power supply level has risen above that level. the underlying floating gate technology, ae 2(tm) used by catalyst semiconductor, makes it possible to offer any custom reset threshold value. seven industry standard threshold levels are offered to support +5.0 v, +3.3 v, +3.0 v and +2.5 v systems. the cat811 features a reset push-pull output (active low) and the cat812 features a reset push-pull output (active high). fast transients on the power supply are ignored and the output is guaranteed to be in the correct state at v cc levels as low as 1.0 v. the cat811/812 are fully specified over the industrial temperature range (-40?c to 85?c) and are available in a compact 4-pin sot143 package. pin configuration threshold suffix selector nominal threshold threshold suffix voltage designation 4.63v l 4.38v m 4.00v j 3.08v t 2.93v s 2.63v r 2.32v z h a l o g e n f r e e tm l e a d f r e e 1 2 4 3 gnd (reset) v cc cat811 (cat812) reset
2 cat811, cat812 doc. no. 3005, rev. p patent pending ordering information insert threshold suffix (l, m, j, t, s, r or z) into the blank position. example: cat811ltbi-t for 4.63 v, and lead-free sot143 package. top marking where ym stands for year and month. r e b m u n t r a p g n i r e d r oy t i r a l o p t e s e re g a k c a pl e e r r e p s t r a p t - s u e _ 1 1 8 t a cl l u p - h s u p t e s e r 3 4 1 t o s , n i p - 4k 3 0 1 t - s u e _ 1 1 8 t a cl l u p - h s u p t e s e r 3 4 1 t o s , n i p - 4k 0 1 t - i b t _ 1 1 8 t a cl l u p - h s u p t e s e r n e e r g 3 4 1 t o s , n i p - 4k 3 0 1 t - i b t _ 1 1 8 t a cl l u p - h s u p t e s e r n e e r g 3 4 1 t o s , n i p - 4k 0 1 t - s u e _ 2 1 8 t a ct e s e r l l u p - h s u p3 4 1 t o s , n i p - 4k 3 0 1 t - s u e _ 2 1 8 t a ct e s e r l l u p - h s u p3 4 1 t o s , n i p - 4k 0 1 t - i b t _ 2 1 8 t a c l l u p - h s u pt e s e r, n i p - 43 4 1 t o sn e e r g k 3 0 1 t - i b t _ 2 1 8 t a c l l u p - h s u pt e s e r, n i p - 43 4 1 t o sn e e r g k 0 1 3 4 1 t o sn e e r g 3 4 1 t o s l 1 1 8 t a cm y m am y h d m 1 1 8 t a cm y n am y j d j 1 1 8 t a cm y z am y k c t 1 1 8 t a cm y p am y l d s 1 1 8 t a cm y q am y m d r 1 1 8 t a cm y r am y n d z 1 1 8 t a cm y y am y p c l 2 1 8 t a cm y s am y r d m 2 1 8 t a cm y t am y t d j 2 1 8 t a cm y u am y u d t 2 1 8 t a cm y v am y v d s 2 1 8 t a cm y w am y w d r 2 1 8 t a cm y x am y x d z 2 1 8 t a cm y i cm y y c
3 cat811, cat812 patent pending doc. no. 3005, rev. p pin descriptions pin number cat811 cat812 1 1 gnd ground 2 reset active low reset. reset is asserted if v cc falls below the reset threshold and remains low for at least 140ms after v cc rises above the reset threshold. 2 reset active high reset. reset is asserted if v cc falls below the reset threshold and remains high for at least 140ms after v cc rises above the reset threshold. 33 mr manual reset input. a logic low on mr asserts reset. reset remains active as long as mr is low and for 140ms after mr returns high. the active low input has an internal 20k ? pull-up resistor. the input should be left open if not used. it can be driven by ttl or cmos logic or shorted to ground by a switch. 44v cc power supply voltage that is monitored. name description
4 cat811, cat812 doc. no. 3005, rev. p patent pending absolute maximum ratings* any pin with respect to ground .......... -0.3 v to +6.0 v input current, v cc ............................................. 20 ma output current, reset, reset ...................... 20 ma rate of rise, v cc ............................................................. 100 v/ s continuous power dissipation derate 4mw/ ? c above 70 ? c (sot143) ........ 320 mw operating temperature range ........... -40 c to +85 c storage temperature range ............ -65 c to +105 c lead soldering temperature (10 sec) .............. 300 c *comment stresses above those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions outside of those listed in the operational sections of this specification is not implied. exposure to any absolute maximum rating for extended periods may affect device performance and reliability. electrical characteristics v cc = full range, t a = -40 c to +85 c unless otherwise noted. typical values at t a = +25 ? c and v cc = 5 v for the l/m/j versions, v cc = 3.3 v for the t/s versions, v cc =3 v for the r version and v cc = 2.5 v for the z version. parameter symbol conditions min typ max units vcc range t a = 0 ? c to +70 ? c 1.0 5.5 t a = -40 ? c to +85 ? c 1.2 5.5 v cc < 5.5 v, j/l/m 8 20 v cc < 3.6 v, r/s/t/z 6 15 t a = +25 ? c 4.56 4.63 4.70 t a = -40 ? c to +85 ? c 4.50 4.75 t a = +25 ? c 4.31 4.38 4.45 t a = -40 ? c to +85 ? c 4.25 4.50 t a = +25 ? c 3.93 4.00 4.06 t a = -40 ? c to +85 ? c 3.89 4.10 t a = +25 ? c 3.04 3.08 3.11 t a = -40 ? c to +85 ? c 3.00 3.15 t a = +25 ? c 2.89 2.93 2.96 t a = -40 ? c to +85 ? c 2.85 3.00 t a = +25 ? c 2.59 2.63 2.66 t a = -40 ? c to +85 ? c 2.55 2.70 t a = +25 ? c 2.28 2.32 2.35 t a = -40 ? c to +85 ? c 2.25 2.38 t a = -40 ? c to +85 ? c supply current i cc v a l threshold m threshold j threshold t threshold s threshold r threshold z threshold v reset threshold voltage v th
5 cat811, cat812 patent pending doc. no. 3005, rev. p electrical characteristics v cc = full range, t a = -40 ? c to +85 ? c unless otherwise noted. typical values at t a = +25 ? c and v cc = 5 v for l/m/j versions, v cc = 3.3 v for t/s versions, v cc = 3 v for r version and v cc = 2.5 v for z version. parameter symbol conditions min typ (1) max units reset threshold tempco 30 ppm/ ? c v cc to reset delay (note 2) v cc = v th to (v th - 100 mv) 20 s reset active timeout period t a = -40 ? c to +85 ? c 140 240 400 ms v cc = v th min, i sink = 1.2 ma cat811r/s/t/z v cc = v th min, i sink = 3.2 ma cat811j/l/m v cc > 1.0 v, i sink = 50 a 0.3 v cc = v th max, i source = 500 a cat811r/s/t/z v cc = v th max, i source = 800 a cat811j/l/m v cc > v th max, i sink = 1.2 ma cat812r/s/t/z v cc > v th max, i sink = 3.2 ma cat812j/l/m mr minimum pulse width t mr 10 s mr glitch immunity note 3 100 ns mr to reset propagation delay t md note 2 0.5 s v ih v cc > v th (max) , cat811/812l/m/j 2.3 v v il 0.8 v ih v cc > v ih (max) , cat811/812r/s/t/z 0.7v cc v il 0.25v cc mr pull-up resistance 10 20 30 k ? (continued) note 1: production testing done at t a = +25 ? c; limits over temperature guaranteed by design only. note 2: reset output for the cat811; reset output for the cat812 note 3: glitches of 100 ns or less typically will not generate a reset pulse. v ol 0.4 v v v oh reset output voltage high (push-pull, active low, cat811) v ol reset output voltage low (push-pull, active high, cat812) v v oh 1.8 v < v cc v th min, i source = 150 a 0.8 v cc 0.8 v cc v cc - 1.5 v reset output voltage low (push-pull, active low, cat811) 0.4 reset output voltage high (push-pull active high, cat812) 0.3 0.3 v mr input threshold
6 cat811, cat812 doc. no. 3005, rev. p patent pending typical operating characteristics v cc = full range, t a = -40 ? c to +85 ? c unless otherwise noted. typical values at t a = +25 ? c and v cc = 5 v for l/m/j versions, v cc =3.3 v for t/s versions, v cc = 3 v for r version and v cc = 2.5 v for z version. supply current vs. temperature (no load, cat8xxr/s/t/z) 12 10 8 6 4 2 0 -50 0 50 100 150 supply current ( a) temperature (?c) power-down reset delay vs. temperature (cat8xxr/s/t/z) 14 12 10 8 6 4 2 0 power-down reset delay ( s) temperature (?c) power-up reset timeout vs. temperature 260 240 220 200 180 160 power-up reset timeout (ms) temperature (?c) normalized reset threshold vs. temperature 1.0002 1 0.9998 0.9996 0.9994 0.9992 0.999 0.9988 0 20 40 60 80 100 120 normalized threshold temperature (?c) v cc =3.6v v cc =5.5v -50 0 50 100 150 v cc =5v v cc =2.5v -50 0 50 100 150
7 cat811, cat812 patent pending doc. no. 3005, rev. p detailed descriptions reset timing the reset signal is asserted low for the cat811 and high for the cat812 when the power supply voltage falls below the threshold trip voltage and remains asserted for at least 140ms after the power supply voltage has risen above the threshold. v cc transient response the cat811/812 protect ps against brownout failure. short duration transients of 4 sec or less and 100 mv amplitude typically do not cause a false reset. figure 2 shows the maximum pulse duration of negative-going v cc transients that do not cause a reset condition. as the amplitude of the transient goes further below the threshold (increasing v th - v cc ), the maximum pulse duration decreases. in this test, the v cc starts from an initial voltage of 0.5v above the threshold and drops below it by the amplitude of the overdrive voltage (v th - v cc ). figure 1. reset timing diagram figure 2. maximum transient duration without causing a reset pulse vs. reset comparator overdrive 30 25 20 15 10 5 0 transient duration [ s) reset overdrive v th - v cc [mv] 1 10 100 1000 t amb = 25 c cat8xxm cat8xxz 5v 0v 5v 0v 5v 0v cat811 cat812 threshold voltage 140ms minimum reset timeout period power supply voltage reset reset
8 cat811, cat812 doc. no. 3005, rev. p patent pending valid reset with v cc under 1.0 v to ensure that the cat811 reset pin is in a known state when v cc is under 1.0 v, a 100 k ? pull-down resistor between reset pin and gnd is recommended; the value is not critical. for the cat812, a pull-up resistor from reset pin to v cc is needed. bi-directional reset pin interfacing the cat811/812 can interface with p/ c bi-directional reset pins by connecting a 4.7 k ? resistor in series with the cat811/812 reset output and the p/ c bi-directional reset pin. cat811 gnd v cc 100k ? power supply reset cat812 gnd v cc 100k ? power supply reset figure 3. reset reset reset reset reset valid with vcc under 1.0 v figure 4. reset valid with vcc under 1.1 v figure 5. bi-directional reset pin interfacing cat811 gnd v cc 4.7k ? power supply reset buffered reset buf reset input gnd bi-directional i/o pin p (for example: 68hc11)
9 cat811, cat812 patent pending doc. no. 3005, rev. p other supervisory products function cat1161/3 cat1162 cat809 cat810 cat811 cat812 with 16k bit serial eeprom memory watchdog timer manual reset input active low reset active high reset dual polarity reset outputs package 8-pin 8-pin 3-pin 3-pin 4-pin 4-pin dip and soic dip and soic sot23 and sot23 and sot143 sot143 sc70 sc70 0.10 max 0.013 min 1.12 max 0.89 min 3.04 max 2.80 min 0.94 max 0.88 min 2.64 max 2.10 min 2.05 max 1.78 min 0.89 max 0.76 min 0.20 0.51 max 0.37 min 1.40 max 1.20 min 0.18 max 0.085 min 0.54 ref 0.41 max 0.21 min 0.20 gauge plane package information plastic sot143 (4-pin)
10 cat811, cat812 doc. no. 3005, rev. p patent pending revision history date rev. reason 10/22/03 l updated ordering information 12/22/2003 m updated features replaced power-up reset timeout vs. temperature graph with updated one relaced vcc transient response graph with updated one 3/22/04 n updated features updated description updated ordering information added top markings updated absolute maximum ratings updated electrical characteristics updated detailed description 3/25/2004 o changed preliminary designation to final updated top markings updated electrical characteristics (reset active timeout period max) 3/25/2004 p corrected pin configure diagram
copyrights, trademarks and patents trademarks and registered trademarks of catalyst semiconductor include each of the following: dpp ae 2 catalyst semiconductor has been issued u.s. and foreign patents and has patent applications pending that protect its products. for a complete list of patents issued to catalyst semiconductor contact the company s corporate office at 408.542.1000. catalyst semiconductor makes no warranty, representation or guarantee, express or implied, regarding the suitability of its products for any particular purpose, nor that the use of its products 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 semic onductor product could create a situation where personal injury or death may occur. catalyst semiconductor reserves the right to make changes to or discontinue any product or service described herein without not ice. products with data sheets labeled "advance information" or "preliminary" and other products described herein may not be in production or offered for sale . catalyst semiconductor advises customers to obtain the current version of the relevant product information before placing order s. circuit diagrams illustrate typical semiconductor applications and may not be complete. publication #: 3005 revison: p issue date: 3/25/04 type: final patent pending catalyst semiconductor, inc. corporate headquarters 1250 borregas avenue sunnyvale, ca 94089 phone: 408.542.1000 fax: 408.542.1200 www.catalyst-semiconductor.com

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