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ht70xxa-2 tinypower tm voltage detector selection table part no. detectable voltage hysteresis width tolerance package marking ht7022a-2 2.2v 0.110v 1% to92 sot89 sot23-5 70xxa-2 (for to92) 70xxa-2# (for sot89) 70xxa-2+ (for sot89) xxa2+ (for sot23-5) ht7024a-2 2.4v 0.120v ht7027a-2 2.7v 0.135v HT7033A-2 3.3v 0.165v ht7039a-2 3.9v 0.195v ht7044a-2 4.4v 0.220v ht7050a-2 5.0v 0.250v ht7082a-2 8.2v 0.410v note: xx stands for output voltages. both lead free and green compound devices are available. # stands for lead free devices. for the to-92 package, there will be a # mark at the end of the date code. + stands for green compound devices, which are lead-free and halogen-free. for the to-92 package, there will be a + mark at the end of the date code. rev. 1.00 1 february 10, 2012 general description the ht70xxa-2 series devices area set of three terminal low power voltage detectors implemented in cmos technology. each voltage detector in the series detects a particular fixed voltage ranging from 2.2v to 8.2v. the voltage detectors consist of a high-precision and low power consumption standard voltage source as well as a comparator, hysteresis circuit, and an output driver. cmos technology ensures low power consumption. although designed primarily as fixed voltage detectors, these devices can be used with external components to detect user specified threshold voltages. features low power consumption low temperature coefficient high input voltage range (up to 24v) output voltage accuracy: tolerance 1% built-in hysteresis characteristic to92, sot89 and sot23-5 package applications battery checkers level selectors power failure detectors microcomputer reset battery memory backup non-volatile ram signal storage protectors
block diagram n channel open drain output (normal open; active low) output table & curve v dd v dd v det (+) v dd v det () v out hi-z vss pin assignment ht70xxa-2 rev. 1.00 2 february 10, 2012

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absolute maximum ratings supply voltage .................................................................................................................. ...........v ss 0.3v to v ss +26v output voltage ...........................v ss 0.3v to v dd +0.3v output current......................................................50ma storage temperature ............................ 50 cto125 c power consumption ..........................................200mw operating temperature ........................... 40 cto85 c note: these are stress ratings only. stresses exceeding the range specified under absolute maximum ratings may cause substantial damage to the device. functional operation of this device at other conditions beyond those listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability. electrical characteristics ht7022a-2 ta=25 c symbol parameter test conditions min. typ. max. unit v dd conditions v det detection voltage 2.178 2.200 2.222 v v hys hysteresis width 0.02 v det 0.05 v det 0.10 v det v i dd operating current 8v no load 47 a v dd operating voltage 2.1 24 v i ol output sink current 2v v out =0.2v 0.5 1.0 ma temperature coefficient -40c

ht7027a-2 ta=25 c symbol parameter test conditions min. typ. max. unit v dd conditions v det detection voltage 2.673 2.700 2.727 v v hys hysteresis width 0.02 v det 0.05 v det 0.10 v det v i dd operating current 8v no load 47 a v dd operating voltage 2.1 24 v i ol output sink current 2v v out =0.2v 0.5 1.0 ma temperature coefficient -40cHT7033A-2 ta=25 c symbol parameter test conditions min. typ. max. unit v dd conditions v det detection voltage 3.267 3.300 3.333 v v hys hysteresis width 0.02 v det 0.05 v det 0.10 v det v i dd operating current 8v no load 47 a v dd operating voltage 2.1 24 v i ol output sink current 2.5v v out =0.25v 1.2 2.5 ma temperature coefficient -40c

ht7044a-2 ta=25 c symbol parameter test conditions min. typ. max. unit v dd conditions v det detection voltage 4.356 4.400 4.444 v v hys hysteresis width 0.02 v det 0.05 v det 0.10 v det v i dd operating current 8v no load 47 a v dd operating voltage 2.1 24 v i ol output sink current 3.6v v out =0.36v 36 ma temperature coefficient -40c

ht70xxa-2 rev. 1.00 6 february 10, 2012 functional description the ht70xxa-2 series is a set of voltage detectors equipped with a high stability voltage reference which is connected to the negative input of a comparator denoted as v ref in the following figure for nmos output voltage detector. when the voltage drop to the positive input of the comparator (i,e,v b ) is higher than v ref , vout goes high, m1 turns off, and v b is expressed as v bh =v dd (r b +r c )/(r a +r b +r c ). if v dd is decreased so that v b falls to a value less than v ref , the comparator output inverts from high to low, v out goes low, v c is high, m1 turns on, rc is bypassed, and v b becomes: v bl =v dd r b /(r a +r b ), which is less than v bh. by so doing, the comparator output will stay low to prevent the circuit from oscillating when v b
v ref . if v dd falls below the minimum operating voltage, the output becomes undefined. when vdd goes from low to v dd r b /(r a +r b )>v ref , the comparator output and v out goes high. the detectable voltage is defined as: v det ()= r+r+r r+r abc bc v ref the release voltage is defined as: v det (+) = r+r r ab b v ref the hysteresis width is: v hys =v det (+) v det () the figure demonstrates the nmos output type with positive output polarity (v out is normally open, active low). the ht70xxa-2 series also supplies options for other output types with active high outputs. application circuits shown are examples of positive output polarity (normally open, active low) unless otherwise specified. & ' $ ( ( $ % "
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application circuits ht70xxa-2 rev. 1.00 7 february 10, 2012 microcomputer reset circuit normally a reset circuit is required to protect the microcomputer system from malfunctions due to power line interruptions. the following examples show how different output configurations perform a reset function in various systems. nmos open drain output application for separate power supply nmos open drain output application with r-c delay power-on reset circuit with several external components, the nmos open drain type of the ht70xxa-2 series can be used to perform a power-on reset function as shown: 5v power line monitoring circuit generally, a minimum operating voltage of 4.5v is guaranteed in a 5v power line system. the ht7044a-2 is recommended for use as 5v power line monitoring circuit. 5v power line monitor with power-on reset ( ) * $ % + " $ ,

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ht70xxa-2 rev. 1.00 8 february 10, 2012 with 5v voltage regulator change of detectable voltage if the required voltage is not found in the standard product selection table, it is possible to change it by using external resistance dividers or diodes. varying the detectable voltage with a resistance di - vider detectable voltage = r+r r ab b v det hysteresis width = r+r r ab b v hys varying the detectable voltage with a diode detectable voltage = v f1 +v f2 +v det malfunction analysis the following circuit demonstrates the way a circuit analyzes malfunctions by monitoring the variation or spike noise of power supply voltage. charge monitoring circuit the following circuit shows a charged monitor for protection against battery deterioration by overcharging. when the voltage of the battery is higher than the set detectable voltage, the transistor turns on to bypass the charge current, protecting the battery from overcharging.
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ht70xxa-2 rev. 1.00 9 february 10, 2012 level selector the following diagram illustrates a logic level selector.

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package information note that the package information provided here is for consultation purposes only. as this information may be updated at regular intervals users are reminded to consult the holtek website ( http://www.holtek.com.tw/english/literature/package.pdf ) for the latest version of the package information. 3-pin to92 outline dimensions symbol dimensions in inch min. nom. max. a 0.170 0.200 b 0.170 0.200 c 0.500 d 0.011 0.020 e 0.090 0.110 f 0.045 0.055 g 0.045 0.065 h 0.130 0.160 0 10 symbol dimensions in mm min. nom. max. a 4.32 5.08 b 4.32 5.08 c 12.70 d 0.28 0.51 e 2.29 2.79 f 1.14 1.40 g 1.14 1.65 h 3.30 4.06 0 10 ht70xxa-2 rev. 1.00 10 february 10, 2012 & ' $

3-pin sot89 outline dimensions symbol dimensions in inch min. nom. max. a 0.173 0.181 b 0.059 0.072 c 0.090 0.102 d 0.035 0.047 e 0.155 0.167 f 0.014 0.019 g 0.017 0.022 h 0.059 i5 5 63 j1 4 17 symbol dimensions in mm min. nom. max. a 4.39 4.60 b 1.50 1.83 c 2.29 2.59 d 0.89 1.19 e 3.94 4.24 f 0.36 0.48 g 0.43 0.56 h 1.50 i 1.40 1.60 j 0.36 0.43 ht70xxa-2 rev. 1.00 11 february 10, 2012 &
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5-pin sot23-5 outline dimensions symbol dimensions in inch min. nom. max. a 0.039 0.051 a1 0.004 a2 0.028 0.035 b 0.014 0.020 c 0.004 0.010 d 0.106 0.122 e 0.055 0.071 e 0.075 h 0.102 0.118 l 0.015 09 symbol dimensions in mm min. nom. max. a 1.00 1.30 a1 0.10 a2 0.70 0.90 b 0.35 0.50 c 0.10 0.25 d 2.70 3.10 e 1.40 1.80 e 1.90 h 2.60 3.0 l 0.37 09 ht70xxa-2 rev. 1.00 12 february 10, 2012
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product tape and reel specifications to92 reel dimensions (unit: mm) ht70xxa-2 rev. 1.00 13 february 10, 2012 ! / - ) 2 . % 3 " % - ) 2 . % 3 " # 4 5 / / 4 6 4
reel dimensions sot89-3 symbol description dimensions in mm a reel outer diameter 180.01.0 b reel inner diameter 62.01.5 c spindle hole diameter 12.75 +0.15/-0.00 d key slit width 1.900.15 t1 space between flange 12.4 +0.2/-0.0 t2 reel thickness 17.0 +0.0/-0.4 sot23-5 symbol description dimensions in mm a reel outer diameter 178.01.0 b reel inner diameter 62.01.0 c spindle hole diameter 13.00.2 d key slit width 2.500.25 t1 space between flange 8.4 +1.5/-0.0 t2 reel thickness 11.4 +1.5/-0.0 ht70xxa-2 rev. 1.00 14 february 10, 2012 & $ ' ,
carrier tape dimensions to92 symbol description dimensions in mm i1 taped lead length (2.5) p component pitch 12.71.0 p 0 perforation pitch 12.70.3 p 2 component to perforation (length direction) 6.350.40 f 1 lead spread 2.5 +0.4/-0.1 f 2 lead spread 2.5 +0.4/-0.1 h component alignment 0.00.1 w carrier tape width 18.0 +1.0/-0.5 w 0 hold-down tape width 6.00.5 w 1 perforation position 9.00.5 w 2 hold-down tape position (0.5) h 0 lead clinch height 16.00.5 h 1 component height less than 24.7 d 0 perforation diameter 4.00.2 t taped lead thickness 0.70.2 h component base height 19.00.5 note: thickness less than 0.38 0.05mm~0.5mm p0 accumulated pitch tolerance: 1mm/20pitches. ( ) bracketed figures are for consultation only ht70xxa-2 rev. 1.00 15 february 10, 2012 , - , - 7 , 7 7 7 - "
carrier tape dimensions sot89-3 symbol description dimensions in mm w carrier tape width 12.0 +0.3/-0.1 p cavity pitch 8.00.1 e perforation position 1.750.10 f cavity to perforation (width direction) 5.500.05 d perforation diameter 1.5 +0.1/-0.0 d1 cavity hole diameter 1.5 +0.1/-0.0 p0 perforation pitch 4.00.1 p1 cavity to perforation (length direction) 2.00.1 a0 cavity length 4.80.1 b0 cavity width 4.50.1 k0 cavity depth 1.80.1 t carrier tape thickness 0.3000.013 c cover tape width 9.30.1 sot23-5 symbol description dimensions in mm w carrier tape width 8.00.3 p cavity pitch 4.00.1 e perforation position 1.750.10 f cavity to perforation (width direction) 3.500.05 d perforation diameter 1.5 +0.1/-0.0 d1 cavity hole diameter 1.5 +0.1/-0.0 p0 perforation pitch 4.00.1 p1 cavity to perforation (length direction) 2.000.05 a0 cavity length 3.150.10 b0 cavity width 3.20.1 k0 cavity depth 1.40.1 t carrier tape thickness 0.200.03 c cover tape width 5.30.1 ht70xxa-2 rev. 1.00 16 february 10, 2012 - 7 - -
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ht70xxa-2 rev. 1.00 17 february 10, 2012 copyright 2012 by holtek semiconductor inc. the information appearing in this data sheet is believed to be accurate at the time of publication. however, holtek as - sumes no responsibility arising from the use of the specifications described. the applications mentioned herein are used solely for the purpose of illustration and holtek makes no warranty or representation that such applications will be suitable without further modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. holtek s products are not authorized for use as critical components in life support devices or systems. holtek reserves the right to alter its products without prior notification. for the most up-to-date information, please visit our web site at http://www.holtek.com.tw. holtek semiconductor inc. (headquarters) no.3, creation rd. ii, science park, hsinchu, taiwan tel: 886-3-563-1999 fax: 886-3-563-1189 http://www.holtek.com.tw holtek semiconductor inc. (taipei sales office) 4f-2, no. 3-2, yuanqu st., nankang software park, taipei 115, taiwan tel: 886-2-2655-7070 fax: 886-2-2655-7373 fax: 886-2-2655-7383 (international sales hotline) holtek semiconductor inc. (shenzhen sales office) 5f, unit a, productivity building, no.5 gaoxin m 2nd road, nanshan district, shenzhen, china 518057 tel: 86-755-8616-9908, 86-755-8616-9308 fax: 86-755-8616-9722 holtek semiconductor (usa), inc. (north america sales office) 46729 fremont blvd., fremont, ca 94538, usa tel: 1-510-252-9880 fax: 1-510-252-9885 http://www.holtek.com

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