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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 september 2005 rev 1.5 asm6381 - asm6390 single/dual low voltage, low power microcontroller power supply supervisor general description the asm6381 - asm6390 are cost effective +1.8v to +5v power supply supervisor circuits optimized for low-power microprocessor (p), microcontroller (c) and digital systems. they provide a reset output during power-up, power-down and brown-out conditions. they pr ovide excellent reliability by eliminating external components and adjustments. a reset signal is issued if the power supply voltage drops below a preset reset threshold and is asserted for a minimum reset timeout period after the supply has risen above the reset threshold. the reset timeout periods are available from 1ms to 1200ms. the asm6381, asm6384 and asm6387 have a push- pull active-low reset output. the asm6382, asm6385 and asm6388 have a push-pull active-high reset output, and the asm6383, asm6386, asm6389 and asm6390 have an open- drain active-low reset output. the asm6384, asm6385 and asm6386 also feature a manual reset input. the asm6387, asm6388, asm6389 have an auxiliary input reset in for monitoring a second voltage. the asm6390 offers a manual reset input with a longer v cc reset timeout period and a shorter manual reset timeout. the reset output state is guarantee d to be in the correct logic state for v cc down to 1v. the reset comparator is designed to ignore fast transients on v cc . low supply current makes the asm6381 - asm6390 ideal for use in portable and battery operated equipments. the asm6381 - asm6383 are available in a compact, industry standard 3-pin sc70 package and the asm6384 - asm6390 are available in a compact, industry standard 4-pin sc70 package. the asm63811, asm63812, asm63832 are available in 3-pin sot23 package. asm63813 is available in 3-pin and 5-pin sot23 package. reset thresholds are available from +1.58v to 4.63v in approximately 100mv increments to support +1.8v to +5v systems. features: ? factory-set reset threshold voltages ranging from +1.58v to 4.63v. ? monitor 1.8v to 5v supplies. ? push-pull active-low reset valid with 1.0v supply. ? small 3-pin sc-70, 4-pin sc-70, 3-pin and 5-pin sot23 packages. ? no external components. ? specified over full temperature range: -40c to 125c ? seven reset timeout periods: 1ms, 20ms, 140ms, 280ms, 560ms, 1120ms, 1200ms (min). ? low power consumption: 3a at +1.8v. ? auxiliary reset in ? manual reset input. applications ? embedded controllers ? portable/battery operated systems ? intelligent instruments ? wireless communication systems ? pdas and handheld equipment ? computers typical operating circuit v cc v cc v cc p reset input reset (reset) gnd gnd (reset) mr reset in r1 r2
2 of 15 notice: the information in this docum ent is subject to change without notice single/dual low voltage, low power microcontroller power supply supervisor rev 1.5 asm6381 - asm6390 september 2005 4 1 pin diagram top view 1 2 3 3sot23 asm63811 reset v cc gnd 1 2 3 3sc-70 asm6381 asm6383 gnd reset v cc (reset) (asm6382) 1 2 3sot23 asm63812 gnd reset 3 v cc 1 2 4 4sc-70 asm6384 asm6386 gnd reset v cc (reset) (asm6385) 3 mr asm6390 1 2 4 4sc-70 asm6387 asm6389 gnd reset v cc (reset) (asm6388) 3 reset in 2 3sot23 asm63813ur reset 3 gnd v cc 3 5sot23 asm63813uk reset 5 nc 2 v cc gnd 1 nc asm63832ur
3 of 15 notice: the information in this docum ent is subject to change without notice single/dual low voltage, low power microcontroller power supply supervisor rev 1.5 september 2005 asm6381 - asm6390 pin description pin # pin name function asm63813ur asm63813uk asm63812 asm63811 asm63832 asm6381 asm6383 asm6382 asm6384/ asm6386/ asm6390 asm6385 asm6387/ asm6389 asm6388 5sot23 3sot23 3sot23 3sot23 3sot23 3sc-70 4sc-70 3 3 1 2 1 1 1 1 1 1 1 gnd ground. 1 1 2 1 2 2 - 2 - 2 - reset reset is asserted low if v cc falls below v th and remains low for t rst after v cc exceeds the threshold. - - - - - - 2 - 2 - 2 reset reset is asserted high if v cc falls below v th and remains high for t rst after v cc exceeds the threshold. -------33--mr manual reset input. a logic low on mr asserts reset. reset remains active as long as mr is low and for t mrst 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. - - - - - - - - - 3 3 resetin auxiliary reset input. reset asserts when either v cc or reset in falls below its threshold voltage. 22333334444 v cc power supply input voltage.
4 of 15 notice: the information in this docum ent is subject to change without notice single/dual low voltage, low power microcontroller power supply supervisor asm6381 - asm6390 rev 1.5 september 2005 detailed description a proper reset input enables a microprocessor or a microcontroller to start in a known state. asm6381 - asm6390 assert reset to prevent code execution errors during power-up, power-down and brown-out conditions. manual reset (mr ) input a logic low on mr asserts reset. mr is internally pulled high through a 63k ? resistor (for asm6381-asm6389, 1.35k ? for asm6390) and can be driven by ttl/cmos gates or with open collector/drain outputs. mr can be left open if not used. mr may be connected to ground through a normally-open momentary switch without an external debounce circuit. a 0.1f capacitor from mr to ground can be added for additional noise immunity. reset output operation in p / c systems it is important to have the processor and the system begin operation from a known state. a reset output to a processor is pr ovided to prevent improper operations during power supply sequencing or low voltage brown-out conditions. the asm6381-asm6390 are designed to monitor the system power supply voltages and issue a reset signal when the levels are out of range. reset outputs are guaranteed to be active for v cc above 1.0v. when v cc exceeds the reset threshold, an internal timer keeps reset active for the reset timeout period, after which r eset becomes inactive. if v cc drops below the reset threshold, reset automatically becomes active. alternatively, external circuitry or an operator can initiate this condition using the manual reset (mr ) pin. mr can be left open if it is not used. mr can be driven by ttl/cmos logic or even an external switch. reset in comparator reset asserts when either v cc or reset in falls below its respective threshold. reset in is compared to an internal +1.27v reference. if the volt age at reset in is less than 1.27v, reset is asserted. the reset in can be used as a secondary power supply monitor input by implementing a resistor divider at reset in pin. valid reset with v cc under 1.0v to ensure logic inputs connected to the asm6381 - asm6390 are in a known state when v cc is under 1.0v, a 100k ? pull- down resistor at reset is needed. the value is not critical. a 100k ? pull-up resistor to v cc is needed with the reset pin. application information negative v cc transients the asm6381 - asm6390 protect ps from brownouts and low v cc . short duration transients of 100mv amplitude and 35s or less duration typicall y do not cause a false reset. figure 1: reset in comparator v cc reset in reset gnd r1 r2 v in v cc power supply asm6382 reset gnd mr v cc asm6381 reset gnd 100k ? mr asm6384 asm6387 p ower supply asm6385 asm6388 100k ? figure 2: reset valid with v cc under 1.0v
5 of 15 notice: the information in this docum ent is subject to change without notice single/dual low voltage, low power microcontroller power supply supervisor rev 1.5 september 2005 asm6381 - asm6390 absolute maximum ratings table 1: absolute maximum ratings table 2: parameter min max units pin terminal voltage with respect to ground v cc -0.3 6.0 v reset, reset -0.3 v cc + 0.3 v input current at v cc 20 ma output current: reset, reset 20 ma rate of rise at v cc 100 v/s esd rating hbm mm 2 200 kv v note: these are stress ratings only and the functional operation is not implied. exposure to absolute maximum ratings for prolonged time periods may affect device reliability. parameter min max units power dissipation (t a = 70c) 235 245 mw operating temperature range -40 125 c storage temperature range -65 150 c lead temperature (soldering, 10 sec) 300 c note: these are stress ratings only and the functional operat ion is not implied. exposur e to absolute maximum rat- ings for prolonged time periods may affect device reliability.
6 of 15 notice: the information in this docum ent is subject to change without notice single/dual low voltage, low power microcontroller power supply supervisor rev 1.5 september 2005 asm6381 - asm6390 electrical characteristics: unless otherwise noted, v cc is over the full voltage range, t a = -40c to 125c. typical values at t a = 25c symbol parameter conditions min typ max unit v cc input voltage range t a = -40c to 125c 1.0 5.5 v i cc v cc supply current v cc < 5.5v v cc < 3.6v v cc < 2.5v v cc < 1.8v 7 6 4 3 13 11 7 6 a v th v cc reset threshold (see table 3) t a = 25c t a = -40c to 125c v th - 1.5% v th - 2.5% v th v th v th + 1.5% v th + 2.5% v v th /c reset threshold temp coefficient 60 ppm/c v cc to reset delay v cc = v th +100mv to v th - 100mv v cc falling at 10mv/s 35 s t rp asm6381 - asm6389 reset active timeout period (see table 4) d1 1 2 ms d2 20 40 d3 140 280 d5 280 560 d6 560 1120 d4 1120 2240 d7 1200 2400 t rp reset timeout period (asm6390) mr timeout period d4 140 280 ms d7 150 300 v cc timeout period d4 1120 2240 d7 1200 2400 v il mr input voltage v th < 4v 0.3 v cc v v ih 0.7 v cc v il v th > 4v 0.8 v ih 2.4 t mr mr minimum input pulse width 1s notes: 1. production testing done at t a = 25c. over-temperature specifications guaranteed by design only, using si x sigma design limits.
7 of 15 notice: the information in this docum ent is subject to change without notice single/dual low voltage, low power microcontroller power supply supervisor rev 1.5 september 2005 asm6381 - asm6390 mr glitch immunity 100 ns t md mr to reset propaga- tion delay 200 ns mr internal pullup resistance asm6381 - asm6389 32 63 100 k ? asm6390 0.8 1.35 2.3 k ? v thrst reset in input threshold t a = +25c 1.245 1.27 1.295 v t a = 0c to +85c 1.232 1.308 v t a = -40c to +125c 1.219 1.321 v reset in to reset delay v resetin = v thrst + 40mv to v thrst - 40mv v resetin falling at 4mv/s 4.5 s i resetin reset in input leak- age current -50 1 +50 na v ol open-drain reset output voltage v cc >=4.5v, i sink = 3.2ma 0.4 0.3 0.3 v v cc >=2.5v, i sink = 1.2ma v cc > 1.0v, i sink = 80a i lkg open-drain reset output leakage cur- rent v cc > v th 1.0 a v oh push-pull reset out- put voltage v cc >=4.5v, i source = 800a 0.8v cc 0.8v cc v v cc > 2.5v, i source = 500a v ol v cc >=4.5v, i sink = 3.2ma 0.4 v cc >= 2.5v, i sink = 1.2ma 0.3 v cc >= 1.0v, i sink = 80a 0.3 symbol parameter conditions min typ max unit notes: 1. production testing done at t a = 25c. over-temperature specifications guaranteed by design only, using si x sigma design limits.
8 of 15 notice: the information in this docum ent is subject to change without notice single/dual low voltage, low power microcontroller power supply supervisor rev 1.5 september 2005 asm6381 - asm6390 reset thresholds (-40c to +125c): table 3 v oh push-pull reset out- put voltage v cc >=4.5v, i source = 800a 0.8v cc v v cc >=2.5v, i source = 500a 0.8v cc v cc >=1.8v, i source = 150a 0.8v cc v ol v cc > 1.0v, i source = 1a 0.8v cc v cc >= 4.5v, i sink = 3.2ma 0.4 v cc >= 2.5v, i sink = 1.2ma 0.3 suffix v th (min) v th (nom) v th (max) 46 4.51 4.63 4.74 45 4.39 4.50 4.61 44 4.27 4.38 4.48 43 4.19 4.30 4.41 42 4.10 4.20 4.31 41 4.00 4.10 4.20 40 3.90 4.00 4.10 39 3.80 3.90 4.00 38 3.71 3.80 3.90 37 3.61 3.70 3.79 36 3.51 3.60 3.69 35 3.41 3.50 3.59 34 3.32 3.40 3.49 33 3.22 3.30 3.38 32 3.12 3.20 3.28 31 3.00 3.08 3.15 30 2.93 3.00 3.08 29 2.85 2.93 3.00 28 2.73 2.80 2.87 symbol parameter conditions min typ max unit notes: 1. production testing done at t a = 25c. over-temperature specifications guaranteed by design only, using si x sigma design limits.
9 of 15 notice: the information in this docum ent is subject to change without notice single/dual low voltage, low power microcontroller power supply supervisor rev 1.5 september 2005 asm6381 - asm6390 reset timeout delay: table 4 27 2.63 2.70 2.77 26 2.56 2.63 2.69 25 2.44 2.50 2.56 24 2.34 2.40 2.46 23 2.26 2.31 2.37 22 2.13 2.19 2.24 21 2.05 2.10 2.15 20 1.95 2.00 2.05 19 1.85 1.90 1.95 18 1.76 1.80 1.85 17 1.62 1.67 1.71 16 1.54 1.58 1.61 suffix min d1 1ms d2 20ms d3 140ms d5 280ms d6 560ms d4 1120ms d7 1200ms asm6390xsyytd4 1120/140ms* asm6390xsyytd7 1200/150ms* * the asm6390 has a 1120ms or 1200ms reset timeout and a 140ms or 150ms mr timeout. suffix v th (min) v th (nom) v th (max)
10 of 15 notice: the information in this docum ent is subject to change without notice single/dual low voltage, low power microcontroller power supply supervisor rev 1.5 september 2005 asm6381 - asm6390 selection guide ordering information part number output stage reset polarity mr reset in 3sc-70 package 4sc-70 package 3sot-23 5sot-23 asm6381 push-pull low ? asm6382 push-pull high ? asm6383 open-drain low ? asm6384 push-pull low ?? asm6385 push-pull high ?? asm6386 open-drain low ?? asm6387 push-pull low ?? asm6388 push-pull high ?? asm6389 open-drain low ?? asm6390 open-drain low ?? asm63811 push-pull low ? asm63812 push-pull low ? asm63813 push-pull low ?? asm63832 open-drain low ? part number** temperature range package asm6381xryytzza -40c to +125c sc70-3 asm6382xryytzza -40c to +125c sc70-3 asm6383xryytzza -40c to +125c sc70-3 asm6384xsyytzza -40c to +125c sc70-4 asm6385xsyytzza -40c to +125c sc70-4 asm6386xsyytzza -40c to +125c sc70-4 asm6387xsyytzza -40c to +125c sc70-4 asm6388xsyytzza -40c to +125c sc70-4 asm6389xsyytzza -40c to +125c sc70-4 asm6390xsyytzza* -40c to +125c sc70-4 asm63811uryytzza -40c to +125c sot23-3 asm63812uryytzza -40c to +125c sot23-3 asm63813uryytzza -40c to +125c sot23-3 asm63813ukyytzza -40c to +125c sot23-5 asm63832uryytzza -40c to +125c sot23-3 yy - insert threshold voltage suffix (see table 3) before ?t?. zz - insert reset timeout delay suffix (see table 4) after ?t?. * - asm6390 is available with d4 or d7 timing only. ** - add ?-t? at the end for tape and reel. a - insert ?f? for lead free parts and ?g? for green parts. note: all alliance semiconductor lead free parts are rohs compliant . all parts are lead free by default. contact factory for n on lead free parts.
11 of 15 notice: the information in this docum ent is subject to change without notice single/dual low voltage, low power microcontroller power supply supervisor rev 1.5 september 2005 asm6381 - asm6390 package dimensions sc-70 (3 pin) symbol dimensions inches millimeters min max min max e 0.045 0.053 1.15 1.35 d 0.073 0.089 1.85 2.25 he 0.071 0.094 1.8 2.4 a 0.031 0.043 0.8 1.1 a2 0.031 0.039 0.8 1.0 a1 0.000 0.004 0.0 0.1 b 0.010 0.016 0.25 0.4 e 0.026 bsc 0.65 bsc c 0.004 0.007 0.1 0.18 l 0.010 0.018 0.26 0.46
12 of 15 notice: the information in this docum ent is subject to change without notice single/dual low voltage, low power microcontroller power supply supervisor rev 1.5 september 2005 asm6381 - asm6390 sc-70 (4 pin) symbol dimensions inches millimeters min max min max e 0.045 0.053 1.15 1.35 d 0.073 0.089 1.85 2.25 he 0.071 0.094 1.8 2.4 a 0.031 0.043 0.8 1.1 a2 0.031 0.039 0.8 1.0 a1 0.000 0.004 0.0 0.1 b 0.010 0.016 0.25 0.4 b1 0.022 0.028 0.55 0.7 e 0.026 bsc 0.65 bsc c 0.004 0.007 0.1 0.18 l 0.010 0.018 0.26 0.46
13 of 15 notice: the information in this docum ent is subject to change without notice single/dual low voltage, low power microcontroller power supply supervisor rev 1.5 september 2005 asm6381 - asm6390 plastic sot-23 (3-pin) symbol dimensions inches millimeters inches millimeters min max min max a 0.030 0.046 0.75 1.17 a1 0.002 0.006 0.05 0.15 b 0.012 0.020 0.30 0.50 c 0.003 0.008 0.08 0.20 d 0.110 0.120 2.80 3.04 e 0.047 0.055 1.20 1.40 e 0.037 bsc 0.95 bsc h 0.083 0.104 2.10 2.64 e1 0.075 bsc 1.9 bsc l 0.016 0.024 0.40 0.60 0 o 8 o 0 o 8 o s nananana
14 of 15 notice: the information in this docum ent is subject to change without notice single/dual low voltage, low power microcontroller power supply supervisor asm6381 - asm6390 rev 1.5 september 2005 5l sot 23 package note: 1. dimensions are in mm. 2. drawing not to scale. 3. dimensions are inclusive of plating. 4. dimensions are exclusive of mold flash and metal burr. 5. mold flash shall not exceed 0.254mm. 6. jedec package reference is mo-193.
asm6381 - asm6390 rev 1.5 september 2005 15 of 15 notice: the information in this docum ent is subject to change without notice single/dual low voltage, low power microcontroller power supply supervisor 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 preliminary information part number: asm6381 - asm6390 document version: v 1.5 ? copyright 2003 alliance semiconductor corpor ation. all rights reserved. our three-point logo, our name and intelliwatt are tr ademarks o r registered trademarks of alliance. all other brand and product nam es 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 a ssumes no responsibility for any errors that may appea r in this document. the data contained herein r epresents alliance's best data and/or esti mates at the time of issuance. alliance reserves the right to change or correct this data at any time, without notice. if the product described herein is under development, significant chan ges to these specifications are possible. the informat ion 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 guaran tee 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 product described herein, and disclaims any express or implied warranties related to the sale and/or use of alliance products including liability or warranties related to fitness for a particular purpose, merc hantability, or infringement of any intellectual property rights, except as express agreed to in alliance's terms and conditions of sale (which are availabl e from alliance). all sales of alliance products are m ade exclusively ac cording to alliance's terms and conditi ons of sale. the purchase of products from alliance does not convey a license under any patent rights, copyrights; mask works rights, trademarks, or any other intellectual property rig hts of alliance or third parties. alliance does not authorize its pr oducts for use as critical components in life-supporting systems where a malfunction or failure may reasonably be expected to result in signific ant injury to the user, and the inclusion of alliance products in such life-support ing systems implies that the manufacturer assumes all risk of such use and agrees to indem nify alliance against all clai ms arising from such use.

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