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ht70xx voltage detector selection table part no. detectable voltage hysteresis width tolerance ht7022a 2.2v 0.11v 5% ht7024a 2.4v 0.12v 5% ht7027a 2.7v 0.135v 5% ht7033a 3.3v 0.165v 5% ht7039a 3.9v 0.195v 5% ht7044a 4.4v 0.22v 5% ht7050a 5.0v 0.25v 5% ht7070a 7.0v 0.35v 5% note: the output type selection codes are: nmos open drain normal open, active low for example: the ht7070a is a 7.0v, nmos open drain active low output output type selection table v dd v dd v det (+) v dd v det ( ) type v out a hi-z vss rev. 1.50 1 october 26, 2001 general description the ht70xx series is a 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 7v. the voltage de - tectors consist of a high-precision and low power con - sumption standard voltage source, a comparator, hysteresis circuit, and an output driver. cmos technol - ogy 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 (nmos open drain type only). features low power consumption low temperature coefficient built-in high-stability reference source built-in hysteresis characteristic to-92 & sot-89 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) a type pin assignment ht70xx rev. 1.50 2 october 26, 2001 gnd vout vdd v ref v out v in v det v hys

pad assignment ht70xx (except ht7022a) chip size: 1317 1158 ( m) 2 * the ic substrate should be connected to vdd in the pcb layout artwork. ht7022a only chip size: 2032 1321 ( m) 2 * the ic substrate should be connected to vdd in the pcb layout artwork. absolute maximum ratings supply voltage, except ht7022a .................................................................................................... ............ 0.3v to 26v supply voltage, ht7022a only ...................................................................................................... .............. 0.3v to 13v output voltage ...........................v ss 0.3v to v dd +0.3v output current......................................................50ma storage temperature ............................ 50 cto125 c power consumption ..........................................200mw operating temperature...............................0 cto70 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 reliabil - ity. ht70xx rev. 1.50 3 october 26, 2001 pad coordinates ht70xx (except ht7022a) unit: m pad no. x y 1 483.30 379.50 2 234.60 399.50 3 443.90 386.00 ht7022a only unit: m pad no. x y 1 434.34 394.97 2 120.65 461.01 3 774.70 412.75
electrical characteristics ht7022a ta=25 c symbol parameter test conditions min. typ. max. unit v dd conditions v det hi lo detectable voltage 2.09 2.2 2.31 v lo hi detectable voltage 2.132 2.31 2.541 v v hys hysteresis width 0.02 v det 0.05 v det 0.1 v det v i dd operating current 3.2v no load 1.8 4 a v dd operating voltage 1.6 12 v i ol output sink current 2v v out =0.2v 0.5 1 ma

v t det a temperature coefficient 0 c
v t det a temperature coefficient 0 c
v t det a temperature coefficient 0 c ht7033a ta=25 c symbol parameter test conditions min. typ. max. unit v dd conditions v det hi lo detectable voltage 3.135 3.3 3.465 v lo hi detectable voltage 3.197 3.465 3.811 v v hys hysteresis width 0.02 v det 0.05 v det 0.1 v det v i dd operating current 8v no load 47 a v dd operating voltage 1.5 24 v i ol output sink current 2.5v v out =0.25v 1.2 2.5 ma

v t det a temperature coefficient 0 c
v t det a temperature coefficient 0 c
v t det a temperature coefficient 0 c ht7050a ta=25 c symbol parameter test conditions min. typ. max. unit v dd conditions v det hi lo detectable voltage 4.75 5 5.25 v lo hi detectable voltage 4.845 5.25 5.775 v v hys hysteresis width 0.02 v det 0.05 v det 0.1 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

v t det a temperature coefficient 0 c
v t det a temperature coefficient 0 c v ref , the comparator output and vout goes high. the detectable voltage is defined as: v det ( )= ra rb rc rb rc v ref the release voltage is defined as: v det (+) = ra rb rb v ref
ht70xx rev. 1.50 7 october 26, 2001 the hysteresis width is: v hys =v det (+) v det ( ) the figure demonstrates the nmos output type with positive output polarity (vout is normally open, active low). the ht70xx series also supplies options for other output types with active high outputs. application cir - cuits shown are examples of positive output polarity (normally open, active low) unless otherwise specified. ! ! " # nmos output voltage detector (ht70xxa) application circuits microcomputer reset circuit normally a reset circuit is required to protect the micro - computer system from malfunctions due to power line interruptions. the following examples show how differ - ent output configurations perform a reset function in var - ious 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 ht70xx series can be used to perform a power-on reset function as shown: ht70xxa v dd v ss v out micro - computer c r v dd2 v dd1 reset ht70xxa v ss v out micro - computer ht7044a v out v ss r d v in v dd c t v dd t v out v out v ss
ht70xx rev. 1.50 8 october 26, 2001 5v power line monitoring circuit generally, a minimum operating voltage of 4.5v is guar - anteed in a 5v power line system. the ht7044a is rec - ommended 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 prod- uct selection table, it is possible to change it by using ex- ternal resistance dividers or diodes. varying the detectable voltage with a resistance di - vider detectable voltage = ra rb rb v det hysteresis width = ra rb rb 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 ana - lyzes malfunctions by monitoring the variation or spike noise of power supply voltage. charge monitoring circuit the following circuit shows a charged monitor for pro- tection against battery deterioration by overcharging. when the voltage of the battery is higher than the set de- tectable voltage, the transistor turns on to bypass the charge current, protecting the battery from overcharg- ing. ht70xxa v ss v in v ss ra rb v out v dd ht70xxa v dd v in v ss vf1 vf2 v out v ss ht7044a v ss v dd v ss c v out 5v power line d r $ $ % ! & & ' % ! ht70xxa v out v ss v dd v ss ht70xxa v dd v out v ss load batt solar cell tr
level selector the following diagram illustrates a logic level selector. ht70xx rev. 1.50 9 october 26, 2001 v dd ht7039a v out ht7050a v out v ss v out v det1 v det2 v dd v det1 v det2 v out t t 5.0v 3.9v
ht70xx rev. 1.50 10 october 26, 2001 copyright 2001 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 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-based industrial park, hsinchu, taiwan tel: 886-3-563-1999 fax: 886-3-563-1189 holtek semiconductor inc. (sales office) 11f, no.576, sec.7 chung hsiao e. rd., taipei, taiwan tel: 886-2-2782-9635 fax: 886-2-2782-9636 fax: 886-2-2782-7128 (international sales hotline) holtek semiconductor (hong kong) ltd. rm.711, tower 2, cheung sha wan plaza, 833 cheung sha wan rd., kowloon, hong kong tel: 852-2-745-8288 fax: 852-2-742-8657 holtek semiconductor (shanghai) inc. 7th floor, building 2, no.889, yi shan rd., shanghai, china tel: 021-6485-5560 fax: 021-6485-0313 holmate technology corp. 48531 warm springs boulevard, suite 413, fremont, ca 94539 tel: 510-252-9880 fax: 510-252-9885

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