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| rev. 1.00 1 april 18, 2013 rev. 1.00 pb april 18, 2013 ht70xxa-3 tinypower tm voltage detector features ? low power consumption ? low temperature coeffcient ? high input voltage range (up to 30v) ? quiescent current 1a ? output voltage accuracy: tolerance 2% ? 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 general description the ht70xxa-3 series devices area set of three terminal low power voltage detectors implemented in cmos technology. each voltage detector in the series detects a particular fxed 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 specifed threshold voltages. selection table part no. detectable voltage hysteresis width tolerance package marking HT7022A-3 2.2v 0.110v 2% to92 sot89 sot23-5 70xxa-3 (for to92) 70xxa-3 (for sot89) xxa3 (for sot23-5) ht7024a-3 2.4v 0.120v ht7027a-3 2.7v 0.135v ht7033a-3 3.3v 0.165v ht7039a-3 3.9v 0.195v ht7044a-3 4.4v 0.220v ht7050a-3 5.0v 0.250v ht7082a-3 8.2v 0.410v note: xx stands for output voltages.
rev. 1.00 2 april 18, 2013 ht70xxa-3 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 rev. 1.00 3 april 18, 2013 ht70xxa-3 absolute maximum ratings supply voltage ................................................... v ss? 0.3v to v ss +33v output voltage .................................................. v ss? 0.3v to v dd +0.3v output current ............................................................................ 50ma power consumption ................................................................. 200mw storage temperature ................................................... ?50c to 125c operating temperature ................................................. ?40c to 85c note: these are stress ratings only. stresses exceeding the range specifed under absolute maximum ratings may cause substantial damage to the device. functional operation of this device at other conditions beyond those listed in the specifcation is not implied and prolonged exposure to extreme conditions may affect device reliability. electrical characteristics HT7022A-3 ta=25c symbol parameter test conditions min. typ. max. unit v dd conditions v det detection voltage 2.156 2.200 2.244 v v hys hysteresis width 0.02v det 0.05v det 0.10v det v i dd operating current 3.2v no load 1 1.5 a v dd operating voltage 1.5 30 v i ol output sink current v det C0.2v v out =0.2v 1 2 ma temperature coeffcient -40c rev. 1.00 7 april 18, 2013 ht70xxa-3 functional description the ht70xxa-3 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 , v out 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, r c 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 undefned. when v dd 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 defned as: v det (?) = (r a +r b +r c ) / (r b +r c ) v ref the release voltage is defned as: v det (+) = (r a +r b ) / r b v ref the hysteresis width is: v hys = v det (+) ? v det (?) nmos output voltage detector the fgure demonstrates the nmos output type with positive output polarity (v out is normally open, active low). the ht70xxa-3 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 specifed. rev. 1.00 8 april 18, 2013 ht70xxa-3 application circuits 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-3 series can be used to perform a power-on reset function as shown: rev. 1.00 9 april 18, 2013 ht70xxa-3 5v power line monitoring circuit generally, a minimum operating voltage of 4.5v is guaranteed in a 5v power line system. the ht7044a-3 is recommended for use as 5v power line monitoring circuit. ? 5v power line monitor with power-on reset ? 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 divider detectable voltage=(r a +r b )/r b v det hysteresis width=(r a +r b )/r 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. rev. 1.00 10 april 18, 2013 ht70xxa-3 level selector the following diagram illustrates a logic level selector. rev. 1.00 11 april 18, 2013 ht70xxa-3 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 for the latest version of the package information. additional supplementary information with regard to packaging is listed below. click on the relevant section to be transferred to the relevant website page. ? further package information (include outline dimensions, product tape and reel specifcations) ? packing meterials information ? carton information ? pb free products ? green packages products rev. 1.00 12 april 18, 2013 ht70xxa-3 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 rev. 1.00 13 april 18, 2013 ht70xxa-3 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 i 55 63 j 14 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 rev. 1.00 14 april 18, 2013 ht70xxa-3 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 0 9 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 0 9 rev. 1.00 15 april 18, 2013 ht70xxa-3 copyright ? 2013 by holtek semiconductor inc. the information appearing in this data sheet is believed to be accurate at the time of publication. however, holtek assumes no responsibility arising from the use of the specifcations 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 notifcation. for the most up-to-date information, please visit our web site at http://www.holtek.com.tw. |
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