asm1817 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, 3.3v/3.0v p reset, active high, push-pull output october 2003 general description the asm1817 voltage supervisory device with low-power, 3.3v/ 3.0v p reset, active high, push-pull output. maximum supply current over temperature is a low 15a. the asm1817 generates an active high 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 20% percent. when an out-of-tolerance condition is detected, an internal power-fail signal is generated which forces an active high reset signal. after v cc returns to an in-tolerance condition, the reset signal remains active for 150ms to allow the power supply and system microprocessor to stabilize. the asm1817 is designed with a push-pull output stage and operates over the extended i ndustrial temperature range. devices are available in compact surface mount sot-23 packages and 3-lead to-92 packages. other low power products in this family include the asm1810/ 11/12/15/16, asm1233d and asm1233m. key features ? low supply current ?20 a maximum (5.5 v) ?15 a maximum (3.6 v) ? automatically restarts a microprocessor after power failure ? 150ms reset delay after v cc returns to an in-tolerance con- dition ? active high power-up reset ? precision temperature-compensated voltage reference and comparator ? eliminates external components ? low-cost to-92 package ? compact surface mount sot-23 package ? push-pull output for minimum current drain ? 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 microprocessor v cc reset reset gnd asm1817 asm1817 v cc reset supply reference delay 150ms typical tolerance bias + - 2 v cc supply tolerance bias - gnd reset reference + 1 3
asm1817 2 of 8 notice: the information in this docum ent is subject to change without notice low power, 3.3v/3.0v p reset rev 1.0 october 2003 pin configuration * see ordering information pin description pin # pin name description 1 reset active high reset output 2 v cc power supply input 3 gnd ground 1 2 3 reset gnd v cc asm1817-x sot-23 to-92* 1 2 3 asm1817-x
3 of 8 notice: the information in this docum ent is subject to change without notice low power, 3.3v/3.0v p reset asm1817 rev 1.0 october 2003 application information operation - power monitor the asm1817 detects out-of-tolerance power supply conditions. it resets a processor during power-up, power- down and issues 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 (high) for approximatley 150ms after the power supply voltage has reached the selected tolerance. this allows the power supply and microprocessor to stablize before reset is released. output conditions the asm1817 active low reset signal is valid as long as v cc remains below 1.2v. the reset output on the asm1817 uses a push-pull drive stage that can maintain a valid output below 1.2v. to sink current with v cc below 1.2v, a resistor can be connecte d from the reset pin (reset ) to ground (see figure 1). this configuration will give a valid value on the reset output with v cc approaching 0v. during both power up and down, this configuration will draw current when the reset is in the high state. a value of 100k ? should be adequate to maintain a valid connection. figure 1: reset valid to 0v v cc microprocessor reset reset asm1817 100k ? ~ ~ t rpu v cctp (min) ~ ~ v cctp v cctp (max) t r v cc figure 2: timing diagram: power-up v ol reset ~ ~ ~ ~ t rpd v cc v cctp (max) v cctp v cctp (min) tf reset reset slews with v cc v oh figure 3: timing diagram: power-down
asm1817 4 of 8 notice: the information in this docum ent is subject to change without notice low power, 3.3v/3.0v p reset rev 1.0 october 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 us e is not implied. exposure to absolute maximum rat- ings for prolonged 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 oh output = 2.4v, v cc > 2.7v 350 a output current i ol output = 0.4v, v cc > 2.7v +10 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 (asm1817-5) v cctp 2.98 3.06 3.15 v v cc trip point (asm1817-10) v cctp 2.80 2.88 2.97 v v cc trip point (asm1817-20) v cctp 2.47 2.55 2.64 v output capacitance c out 10 pf 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 top reset high t rpu t r = 5s 100 150 250 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 oper ating temperature range of -40c to +85c. all voltages are referenced to ground
asm1817 5 of 8 notice: the information in this docum ent is subject to change without notice low power, 3.3v/3.0v p reset rev 1.0 october 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
asm1817 6 of 8 notice: the information in this docum ent is subject to change without notice low power, 3.3v/3.0v p reset rev 1.0 october 2003 package dimension b e h s e d a a1 e1 c l a plastic sot-23 (3-pin) to-92 (3-pin) b a d c section a-a f e 12 3 g h l m k d j section a-a bottom view i inches millimeters min max min max plastic sot-23 (3-pin) a 0.031 0.050 0.80 1.27 a1 0.004 0.010 0.10 0.25 b 0.015 0.020 0.37 0.51 c 0.003 0.007 0.085 0.18 d 0.110 0.120 2.80 3.04 e 0.047 0.055 1.20 1.40 e 0.035 0.040 0.89 1.03 e1 0.070 0.080 1.78 2.05 h 0.083 0.1039 2.10 2.64 l 0.027 ref 0.069 ref s 0.018 0.024 0.45 0.60 inches millimeters 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 0.060 1.14 1.52 g 0.045 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 0 60 0 45 0 60 0 m 0.118 typical 3.00
asm1817 7 of 8 notice: the information in this docum ent is subject to change without notice low power, 3.3v/3.0v p reset rev 1.0 october 2003 ordering information device summary package marking part ** number reset output voltage (v) reset tolerance (%) reset time (ms) push-pull output stage to-92* package sot-23 package reset polarity a b c d asm1817-5 3.06 5 150 ? ? high asm1817-10 4.35 10 150 ? ? high asm1817-20 4.13 15 150 ? ? high asm1817r-5 4.62 5 150 ? ? high m a x x ASM1817R-10 4.35 10 150 ? ? high m b x x asm1817r-20 4.13 15 150 ? ? high m c x x * add /s to part number for straight (unformed) leads. (i.e. asm18xx-x/s) ** add /t to part number for tape and reel (i.e asm18xx-x/t) xx- date code
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: asm1817 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. asm1817
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