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ht70xxa-1 tinypower tm voltage detector selection table part no. detectable voltage hysteresis width tolerance package marking HT7022A-1 2.2v 0.11v 3% to92 sot89 sot23 sot23-5 70xxa-1 (for to92) 70xxa-1 (for sot89) 70xxa-1# (for sot89) 70xxa-1+ (for sot89) 0xxa (for sot23) 0xxa+ (for sot23) 0xxa (for sot23-5) 0xxa# (for sot23-5) 0xxa+ (for sot23-5) ht7024a-1 2.4v 0.12v 3% ht7027a-1 2.7v 0.135v 3% ht7033a-1 3.3v 0.165v 3% ht7039a-1 3.9v 0.195v 3% ht7044a-1 4.4v 0.22v 3% ht7050a-1 5.0v 0.25v 3% note: xx stands for output voltages. both lead free and green compound devices are available. note the symbol marks below: # stands for lead free devices. blank and + stands for green compound devices, which are lead-free and halogen-free. for the to92 package, the symbol mark will be at the end of the date code. whereas for the sot89, sot23 and sot23-5, the symbol mask will be located at the end of ic marking. rev. 2.00 1 april 30, 2013 general description the ht70xxa-1 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 5v. 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 3% built-in hysteresis characteristic to92, sot89, sot23 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-1 rev. 2.00 2 april 30, 2013 g n d v o u t v d d v r e f d a s h l i n e . . . v i n f r o m l o ? h i s o l i d l i n e . . . v i n f r o m h i ? l o v o u t v i n v h y s v d e t v d e t 1 . 0 5 o u t v d d v s s s o t 8 9 t o 9 2 o u t v d d v s s 7 0 x x a - 1 f r o n t v i e w s i d e v i e w s o t 2 3 - 5 n c n c t o p v i e w 0 x x a o u t v d d v s s o u t v d d v s s o u t v d d v s s 7 0 x x a - 1 s o t 2 3 v o u t v s s o u t 3 2 1 v s s o u t 0 x x a
absolute maximum ratings supply voltage .............................................................................................................................v ss -0.3v to v ss +26v output v oltage ...........................v ss -0.3v to v dd +0.3v output current......................................................50ma storage t emperature ............................ -50c to 125 c power consumption ..........................................200mw operating temperature ........................... -40c to 85c note: these are stress ratings only. stresses exceeding the range specified under 2 absolute maximum ratings2 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-1 ta=25 c symbol parameter test conditions min. typ. max. unit v dd conditions v det detection voltage ? ? 2.134 2.200 2.266 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 ? 3 6 ma v dd operating voltage ? ? 1.5 ? 24 v i ol output sink current 2v v out =0.2v 0.5 1 ? ma temperature coefficient ? -40c ht7027a-1 ta=25 c symbol parameter test conditions min. typ. max. unit v dd conditions v det detection voltage ? ? 2.619 2.700 2.781 v v hys hysteresis width ? ? 0.02 v det 0.05 v det 0.1 v det v i dd operating current 3.7v no load ? 3 6 ma v dd operating voltage ? ? 1.5 ? 24 v i ol output sink current 2v v out =0.2v 0.5 1 ? ma temperature coefficient ? -40c ht7044a-1 ta=25 c symbol parameter test conditions min. typ. max. unit v dd conditions v det detection voltage ? ? 4.268 4.400 4.532 v v hys hysteresis width ? ? 0.02 v det 0.05 v det 0.1 v det v i dd operating current 5.4v no load ? 3 6 ma v dd operating voltage ? ? 1.5 ? 24 v i ol output sink current 3.6v v out =0.36v 3 6 ? ma temperature coefficient ? -40c v ref , the comparator output and v out goes high. the detectable voltage is defined as: v det (-) = r + r + r r + r a b c b c v ref the release voltage is defined as: v det (+) = r + r r a b 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-1 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. v s s v d d r a r b r c m 1 m n c o m p a r a t o r v o u t r l v r e f v b v c nmos output voltage detector d v d e t d t a d v d e t d t a
typical performance characteristics ht70xxa-1 rev. 2.00 6 april 30, 2013
application circuits ht70xxa-1 rev. 2.00 7 april 30, 2013 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-1 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-1 is recommended for use as 5v power line monitoring circuit. 5v power line monitor with power-on reset h t 7 0 x x a - 1 v d d v s s v o u t m i c r o - c o m p u t e r c r v d d 2 v d d 1 r e s e t h t 7 0 x x a - 1 v s s v o u t m i c r o - c o m p u t e r h t 7 0 x x a - 1 v o u t v s s r d v i n v d d c t v d d t v o u t v o u t v s s h t 7 0 4 4 a - 1 v s s v d d v s s c v o u t 5 v p o w e r l i n e d r
ht70xxa-1 rev. 2.00 8 april 30, 2013 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 a b b v det hysteresis width = r + r r a b b v hys v arying 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 p r o t e c t i o n a g a i n s t b a t t e r y d e t e r i o r a t i o n b y 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. h t 7 0 4 4 a - 1 v s s v d d h t 7 1 5 0 - 1 v o u t v i n g n d 5 v 5 v v o l t a g e r e g u l a t o r h t 7 0 x x a - 1 v s s v i n v s s v o u t v d d r a r b h t 7 0 x x a - 1 v d d v i n v s s v f 1 v f 2 v o u t v s s h t 7 0 x x a - 1 v o u t v s s v d d v s s h t 7 0 x x a - 1 v d d v o u t v s s l o a d b a t t s o l a r c e l l t r
ht70xxa-1 rev. 2.00 9 april 30, 2013 level selector the following diagram illustrates a logic level selector. v d d h t 7 0 3 9 a - 1 v o u t h t 7 0 5 0 a - 1 v o u t v s s v o u t v d e t 1 v d e t 2 v d d v d e t 1 v d e t 2 v o u t t t 5 . 0 v 3 . 9 v
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 specifications) packing meterials information carton information pb free products green packages products ht70xxa-1 rev. 2.00 10 april 30, 2013
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 a 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 a 0 ? 10 ht70xxa-1 rev. 2.00 11 april 30, 2013 a b c e f g h d
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 ht70xxa-1 rev. 2.00 12 april 30, 2013 a e b c d h g f i j
3-pin sot23 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 ? ? q 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 ? 3.00 l 0.37 ? ? q 0 ? 9 ht70xxa-1 rev. 2.00 13 april 30, 2013 d h e e a 2 b a 1 a c l q
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 ? ? q 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 ? ? q 0 ? 9 ht70xxa-1 rev. 2.00 14 april 30, 2013 d h e e a 2 b a 1 a c l q
ht70xxa-1 rev. 2.00 15 april 30, 2013 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 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 modi - fication, 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 com - ponents 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.

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