asm1233d alliance semiconductor 2575 augustine drive . santa clara, ca 95054 . tel: 408.855.4900 . fax: 408.855.4999 . www.alsc.com notice: the information in this document is subject to change without notice rev 1.0 low power, 5p reset, active low, open-drain output september 2003 general description the asm1233d is a voltage supervisory device with low-power, 5v p reset, and an active lo w, open-drain output. maximum supply current over temperature is a low 20a. the asm1233d generates an active low reset signal whenever the monitored supply is out of tolerance. a precision reference and comparator circuit monitor power supply (v cc ) level. tolerance level options are 5%, 10% and 15%. when an out-of-tolerance condition is de tected, an internal power-fail signal is generated which forces an active low reset signal. after v cc returns to an in-tolerance condition, the reset signal remains active for 350ms to allow the power supply and system microprocessor to stabilize. the asm1233d is designed with a open-drain output stage and operates over the extended i ndustrial temperature range. devices are available in compact surface mount sot-223 packages and 3-lead to-92 packages. other low power products in this family include the asm1810/ 11/12/15/16/17 and asm1233m. key features ? low supply current ?20 a maximum (5.5 v) ?15a maximum (3.6 v) ? automatically restarts a microprocessor after power failure ? 350ms reset delay after v cc returns to an in-tolerance con- dition ? active low power-up reset, 5k ? internal pull-up ? precision temperature-compensated voltage reference and comparator ? eliminates external components ? low-cost to-92 package ? compact surface mount sot-223 package ? operating temperature -40c to +85c applications ? set-top boxes ? cellular phones ?pdas ? energy management systems ? embedded control systems ? printers ? single board computers typical operating circuit block diagram asm1233d gnd supply reference delay 150ms typical tolerance bias + - microprocessor v cc reset supply reference delay 150ms typical tolerance bias + - 1 2 3 v cc reset reset gnd asm1233d 5.0k ?
asm1233d 2 of 8 notice: the information in this docum ent is subject to change without notice low power, 5p reset, active low, open-drain output rev 1.0 september 2003 pin configuration pin description * see ordering information pin # pin name description sot-223 to-92 11gndground 2 2 reset active low reset output 33 v cc power supply input 4 - gnd ground (sot-223 only) 1 2 3 reset gnd v cc asm1233d-x sot-223 to-92* 1 2 3 asm1233d-x 4 gnd
3 of 8 notice: the information in this docum ent is subject to change without notice low power, 5p reset, acti ve low, open-drain output asm1233d rev 1.0 september 2003 application information operation - power monitor the asm1233d detects out-of-tolerance power supply conditions. it resets a processor during power-up, power- down and generates a reset to the system processor when the monitored power supply voltage is below the reset threshold. when an out-of-tolerance v cc voltage is detected, the reset signal is asserted. on power-up, reset is kept active (low) for approximatley 350ms after the power supply voltage has reached the selected tolerance. this allows the power supply and microproce ssor to stablize before reset is released. ~ ~ t rpu v cctp (min) ~ ~ v oh v cctp v cctp (max) t r v cc reset figure 1: timing diagram: power-up ~ ~ v cctp (min) v cctp v cctp (max) t f v cc t rpd v ol reset figure 2: timing diagram: power-down
asm1233d 4 of 8 notice: the information in this docum ent is subject to change without notice low power, 5p reset, active low, open-drain output rev 1.0 september 2003 absolute maximum ratings electrical characteristics parameter min max unit voltage on v cc -0.5 7 v voltage on reset -0.5 v cc + 0.5 v operating temperature range -40 85 c soldering temperature (for 10 sec) 260 c storage temperature -55 125 c note: these are stress ratings only and functional use is not implied. exposur e to absolute maximum ratings for pro- longed periods of time may affect device reliability. parameter symbol conditions min typ max unit supply voltage v cc 1.2 5.5 v output voltage v oh i out < 500 a v cc - 0.5v v cc - 0.1v v output current i ol output = 0.4v, v cc >= 2.7v +8 ma operating current i cc v cc < 5.5v, reset output open 820a operating current i cc v cc < =3.6v, reset output open 615a v cc trip point (asm1233d-5) v cctp 4.50 4.625 4.74 v v cc trip point (ASM1233D-10) v cctp 4.25 4.375 4.49 v v cc trip point (asm1233d-15) v cctp 4.00 4.125 4.24 v internal pull-up resistor r p 3.5 5.0 7.5 k ? output capacitance c out 10 pf reset active time t reset 250 350 450 ms v cc detect to reset low t rpd 25s v cc slew rate (v cctp (max) to v cctp (min) t f 300 s v cc slew rate (v cctp (min) to v cctp (max) t r 0ns v cc detect to reset high t rpu t r = 5s 250 350 450 ms note: the t f value is for reference in defining values for t rpd and should not be considered for proper operation or use. unless otherwise noted, v cc = 1.2v to 5.5v and specifications are over the opera ting temperature range of -4 0c to +85c. all voltages are referenced to ground
asm1233d 5 of 8 notice: the information in this docum ent is subject to change without notice low power, 5p reset, active low, open-drain output rev 1.0 september 2003 family selection guide part # reset voltage (v) reset time (ms) output stage reset polarity asm1810 4.620, 4.370, 4.120 150 push-pull low asm1811 4.620, 4.350, 4.130 150 open-drain low asm1812 4.620, 4.350, 4.130 150 push-pull high asm1815 3.060, 2.880, 2.550 150 push-pull low asm1816 3.060, 2.880, 2.550 150 open-drain low asm1817 3.060, 2.880, 2.550 150 push-pull high asm1233d 4.625, 4.375, 4.125 350 open-drain low asm1233m 4.625, 4.375, 2.720 350 open-drain low
6 of 8 notice: the information in this docum ent is subject to change without notice low power, 5p reset, acti ve low, open-drain output asm1233d rev 1.0 september 2003 package information sot-223 (4-pin) to-92 (3 pin) dimensions in millimeters dimensions in inches min max min max plastic sot-223** (4-pin) a 0.067 0.060 1.70 1.50 a1 0.004 0.0008 0.10 0.02 b 0.124 0.116 3.15 2.95 b1 0.033 0.026 0.85 0.65 c 0.014 0.010 0.35 0.25 d 0.264 0.248 6.70 6.30 e 0.0905 nom 2.30 nom e1 0.181 nom 4.50 nom e 0.146 0.130 3.70 3.30 h 0.287 0.264 7.30 6.70 s 0.041 0.033 1.05 0.85 q 10 max 10 max q1 16 10 16 10 q2 16 10 16 10 dimensions in millimteres dimensions in inches min max min max to-92* (3-pin) a 0.175 0.195 4.45 4.95 b 0.170 0.192 4.32 4.96 c 0.500 0.610 12.70 15.49 d 0.016 0.022 0.406 0.559 e 0.095 0.105 2.41 2.67 f 0.045 0.60 1.14 1.52 g 0.45 0.060 1.14 1.52 h 0.085 0.095 2.16 2.41 i 0.130 0.155 3.30 3.94 j 0.014 0.020 0.35 0.51 k 0.093 0.115 2.36 2.92 l 45 60 45 60 m 0.118 typical 3.00 b e h s e d a a1 e1 b1 q q1 q2 c a b c d e h j k l m i f g d section a-a section a-a bottom view
asm1233d 7 of 8 notice: the information in this docum ent is subject to change without notice low power, 5p reset, active low, open-drain output rev 1.0 september 2003 ordering information device summary package marking part number reset output voltage (v) reset tolerance (%) reset time (ms) open- drain output stage*** to-92 package* sot-223 package** reset polarity a b c d a=5% b=10% c=15% asm1233d-5 4.625 5 350 ? ? low ASM1233D-10 4.375 10 350 ? ? low asm1233d-15 4.125 15 350 ? ? low asm1233dz-5 4.625 5 350 ? ? low 3 3 d a asm1233dz-10 4.375 10 350 ? ? low 3 3 d b asm1233dz-15 4.125 15 350 ? ? low 3 3 d c * add /s to part number for straight (unformed) leads. (i.e. asm1233xx-x/s) ** add /t to part number for tape and reel (i.e asm1233xx-x/t) ** internal 5k ? resistor pull-up
alliance semiconductor corporation 2575, augustine drive, santa clara, ca 95054 tel: 408 - 855 - 4900 fax: 408 - 855 - 4999 www.alsc.com copyright ? alliance semiconductor all rights reserved part number: asm1233d document version: 1.0 ? copyright 2003 alliance semiconductor corporation. all rights reserved. our three-point logo, our name and intelliwatt are tr ademarks or registered trademarks of alliance. all other brand and product names may be the trademarks of their respective companies. allia nce reserves the right to make changes to this document and its products at any time without notice. alliance assumes no responsibility for any errors that may appear in this document. the data contained herein represents al liance's best data and/or estimates at the time of issuance. al liance reserves the right to change or correct this data at any time, without notice. if the product described herein is under development, signifi cant change s to these specifications are possible. the information in this product data sheet is intended to be general descriptive information for p otential customers and users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or customer. alliance does not ass ume any responsibility or liability arising out of the application or use of any prod uct described herein, and disclaims any express or implied warran ties related to the sale and/or use of alliance products including liability or warrant ies related to fitness for a particular purpose, merchantability, or infringement of any intellectual property rights, except as express agreed to in al liance's terms and conditions of sale (which are available from alliance). all sales of alliance products are made exclusively accord ing to alliance's terms and conditions of sale. the purchase of products from alli ance does not convey a license under any patent rights, copyrights; mask work s rights, trademarks, or any other intellectual property rights of alliance or third parties. alliance does not authorize its products for use as crit ical components in life-supporti ng systems where a malfunction or failure may reasonably be expected to result in sign ificant injury to the user, and the inclusio n of alliance products in such life-support ing systems implies that the manufacturer assumes all risk of such use and agrees to indemnify alliance against all claims arising from such use. asm1233d
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