ASM809, asm810 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 october 2003 rev 1.0 3 pin microcontroller power supply supervisor general description the ASM809/asm810 are cost effe ctive 3.0v, 3.3v and 5.0v 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. the ASM809/810 are improved drop-in replacements for the maxim max809/810 and feature 60% lower supply current. a reset signal is issued if the power supply voltage drops below a preset reset threshold and is asserted for at least 140ms after the supply has risen above the reset threshold. the ASM809 has an active-low reset output that is guaranteed to be in the correct logic state for v cc down to 1.1v. the asm810 has an active-high reset output. the reset comparator is designed to ignore fast transients on v cc . low supply current makes the ASM809/asm810 ideal for use in portable and battery operated equipment. the ASM809/asm810 are available in a compact, industry standard 3-pin sot23 package. six voltage thresholds are available to support 3v to 5v systems: features: ? monitor 5v, 3.3v and 3v supplies ? 140ms min. reset pulse width ? active-low reset valid with 1.1v supply (ASM809) ? small 3-pin sot-23 package ? no external components ? specified over full temperature range - -40c to 105c reset threshold suffix voltage l4.63 m4.38 j4.00 t3.08 s2.93 r2.63 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)
2 of 10 notice: the information in this docum ent is subject to change without notice 3 pin microcontroller po wer supply supervisor ASM809, asm810 october 2003 rev 1.0 pin diagram block diagram pin description pin # pin name function ASM809 asm810 1 - gnd ground. 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 reset reset is asserted high if v cc falls below v th and remains high for t rst after v cc exceeds the threshold. 3- v cc power supply input voltage (3.0v, 3.3v, 5.0v). detailed description a proper reset input enables a microprocessor / microcontroller to start in a known state. ASM809/810 assert reset to prevent code execution errors during power-up, power-down and brown-out conditions. reset timing the reset signal is asserted- low for the ASM809 and high for the asm810- when the v cc supply voltage falls below the threshold trip voltage and remains asserted for 140ms minimum after the v cc has risen above the threshold. 1 2 3 sot23 ASM809 (asm810) gnd reset v cc (reset) ASM809 asm810 reset reset 0v 5v 0v 5v 0v 5v v cc v th t rst figure 1: reset timing diagram + - reset generator - + v cc reset (reset) gnd ASM809 (asm810) 4.38v 4.00v 3.08v 2.93v 2.63v 4.63v
3 of 10 notice: the information in this docum ent is subject to change without notice 3 pin microcontroller power supply supervisor ASM809, asm810 october 2003 rev 1.0 application information negative v cc transients the ASM809/810 protect ps from brownouts and low v cc . short duration transients of 100mv amplitude and 20s or less duration typically do not cause a false reset. valid reset with v cc under 1.1v when v cc is under 1.1v, to ensure logic inputs connected to the ASM809 reset pin are in a known state, a 100k ? pull- down resistor is needed at reset . the value of the resistor is not critical. a 100k ? pull-up resistor to v cc at reset is needed with the asm810. bidirectional reset pin interfacing the ASM809/810 can interface with p / c bi-directional reset pins by connecting a 4.7k ? resistor in series with the ASM809/810 reset output and the p/c bi-directional reset pin. v cc power supply ASM809 reset gnd 100k ? v cc power supply asm810 reset gnd 100k ? power supply buf buffered reset v cc ASM809 gnd gnd reset reset input c or p 4.7k ? bi-directional i/o pin figure 2: reset valid with v cc under 1.1v figure 3: reset valid with v cc under 1.1v figure 4: bidirectional reset pin interfacing
ASM809, asm810 4 of 10 notice: the information in this docum ent is subject to change without notice 3 pin microcontroller po wer supply supervisor october 2003 rev 1.0 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 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) 320 uw operating temperature range -40 105 c storage temperature range -65 160 c lead temperature (soldering, 10 sec) 300 c 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.
ASM809, asm810 5 of 10 notice: the information in this docum ent is subject to change without notice 3 pin microcontroller po wer supply supervisor october 2003 rev 1.0 electrical characteristics: unless otherwise noted, v cc is over the full voltage range, t a = -40c to 105c. typical values at t a = 25c, v cc = 5v for l/m/j devices, v cc = 3.3v for t/s devices and v cc = 3v for r devices. symbol parameter conditions min typ max unit v cc input voltage range t a = 0c to 70c t a = -40c to 105c 1.1 1.2 5.5 5.5 v v i cc supply current t a = -40c to 85c t a = -40c to 85c t a = 85c to 105c t a = 85c to 105c v cc < 5.5v, l/m/j v cc < 3.6v, r/s/t v cc < 5.5v, l/m/j v cc < 3.6v, r/s/t 9 6.8 15 10 25 20 a v th reset threshold l devices t a = 25c t a = -40c to 85c t a = 85c to 105c 4.56 4.50 4.40 4.63 4.70 4.75 4.86 v m devices t a = 25c t a = -40c to 85c t a = 85c to 105c 4.31 4.25 4.16 4.38 4.45 4.50 4.56 j devices t a = 25c t a = -40c to 85c t a = 85c to 105c 3.93 3.89 3.80 4.00 4.06 4.10 4.20 t devices t a = 25c t a = -40c to 85c t a = 85c to 105c 3.04 3.00 2.92 3.08 3.11 3.15 3.23 s devices t a = 25c t a = -40c to 85c t a = 85c to 105c 2.89 2.85 2.78 2.93 2.96 3.00 3.08 r devices t a = 25c t a = -40c to 85c t a = 85c to 105c 2.59 2.55 2.50 2.63 2.66 2.70 2.76 reset threshold temp coefficient 30 ppm/c v cc to reset delay v cc = v th to v th -100mv 60 s notes: 1. production testing done at t a = 25c. over-temperature specifications guaranteed by design only, using six sigma design limits. 2. reset output is active low for the ASM809 and reset output is active high for the asm810.
ASM809, asm810 6 of 10 notice: the information in this docum ent is subject to change without notice 3 pin microcontroller po wer supply supervisor october 2003 rev 1.0 reset active timeout period t a = -40c to 85c 140 100 240 560 840 ms t a = 85c to 105c v ol low reset output voltage (ASM809) v cc = v th min., i sink = 1.2ma, ASM809r/s/t 0.3 0.4 0.3 v v cc = v th min., i sink = 3.2ma, ASM809l/m/j v cc > 1.1v, i sink = 50a v oh high reset output voltage (ASM809) v cc > v th max., i source = 500a, ASM809r/ s/t 0.8v cc v cc - 1.5 v v cc > v th max., i source = 800a, ASM809l/ m/j v ol low reset output voltage (asm810) v cc = v th max., i sink = 1.2ma, asm810r/s/t 0.3 v v cc = v th max., i sink = 3.2ma, asm810l/m/j 0.4 v v oh high reset output voltage (asm810) 1.8v < v cc < v th min., i source = 150a 0.8v cc v t rst active reset timeout period v cc > v th 140 240 msec symbol parameter conditions min typ max unit notes: 1. production testing done at t a = 25c. over-temperature specifications guaranteed by design only, using six sigma design limits. 2. reset output is active low for the ASM809 and reset output is active high for the asm810.
ASM809, asm810 7 of 10 notice: the information in this docum ent is subject to change without notice 3 pin microcontroller po wer supply supervisor october 2003 rev 1.0 typical operating characteristics unless otherwise noted, v cc is over the full voltage range, t a = -40c to 105c. typical values at t a = 25c, v cc = 5v for l/m/j devices, v cc = 3.3v for t/s devices and v cc = 3v for r devices. normalised threshold vs temperature 0.92 0.94 0.96 0.98 1 1.02 1.04 -40 -20 0 20 40 60 80 100 125 temperature (c) normalised reset threshold supply current vs temperature 0 2 4 6 8 10 -40 -20 0 20 40 60 80 100 125 temperature (c) supply current (a) reset timeout period vs temperature 0 50 100 150 200 250 300 350 -40 -20 0 20 40 60 80 100 125 temperature (c) reset timeout period (ms) ASM809t ASM809r ASM809t ASM809r ASM809t ASM809r
ASM809, asm810 8 of 10 notice: the information in this docum ent is subject to change without notice 3 pin microcontroller po wer supply supervisor october 2003 rev 1.0 package dimensions 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 0.103 9 2.10 2.64 l 0.027 ref 0.069 ref s 0.018 0.024 0.45 0.60 b e h s e d a a1 e1 c l a
ASM809, asm810 9 of 10 notice: the information in this docum ent is subject to change without notice 3 pin microcontroller po wer supply supervisor october 2003 rev 1.0 ordering information: related products: part number 1 reset threshold (v) temperature range pin-package package marking (xx lot code) ASM809 active low reset ASM809leur-t 4.63 -40c to +105c 3-sot23 saxx ASM809meur-t 4.38 -40c to +105c 3-sot23 sbxx ASM809jeur-t 4.00 -40c to +105c 3-sot23 scxx ASM809teur-t 3.08 -40c to +105c 3-sot23 sdxx ASM809seur-t 2.93 -40c to +105c 3-sot23 sexx ASM809reur-t 2.63 -40c to +105c 3-sot23 sfxx asm810 active high reset asm810leur-t 4.63 -40c to +105c 3-sot23 sgxx asm810meur-t 4.38 -40c to +105c 3-sot23 shxx asm810jeur-t 4.00 -40c to +105c 3-sot23 sixx asm810teur-t 3.08 -40c to +105c 3-sot23 sjxx asm810seur-t 2.93 -40c to +105c 3-sot23 skxx asm810reur-t 2.63 -40c to +105c 3-sot23 slxx notes: 1. tape and reel packaging is indicated by the -t designation. ASM809 asm810 asm811 asm812 max supply current 15a 15a 15a 15a package pins 3344 manual reset input ? ? package type sot-23 sot-23 sot-143 sot-143 active-high reset output ? ? active-low reset output ? ?
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: ASM809, asm810 document version: v 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. ASM809, asm810
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