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| HT70XXA-1 Voltage Detector Features * Low power consumption * Low temperature coefficient * Built-in high-stability reference source * Built-in hysteresis characteristic * TO-92, SOT-89 and SOT-25 package Applications * Battery checkers * Level selectors * Power failure detectors * Microcomputer reset * Battery memory backup * Non-volatile RAM signal storage protectors General Description The HT70XXA-1 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 2.4V to 5V. The voltage detectors consist of a high-precision and low power consumption standard voltage source, 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 (NMOS open drain type only). Selection Table Part No. HT7024A-1 HT7027A-1 HT7033A-1 HT7039A-1 HT7044A-1 HT7050A-1 Note: Detectable Voltage 2.4V 2.7V 3.3V 3.9V 4.4V 5.0V Hysteresis Width 0.12V 0.135V 0.165V 0.195V 0.22V 0.25V Tolerance 3% 3% 3% 3% 3% 3% TO-92 SOT-89 SOT-25 70XXA-1 (for TO-92) 70XXA-1 (for SOT-89) 0XXA (for SOT-25) Package Marking The output type selection codes are: NMOS open drain normal open, active low For example: The HT7050A-1 is a 5.0V, NMOS open drain active low output Output Type Selection Table VDD Type VOUT A VDD>VDET(+) Hi-Z VDDVDET(-) VSS Rev. 1.10 1 October 15, 2003 HT70XXA-1 Block Diagram N Channel Open Drain Output (Normal Open; Active Low) VDD VOUT VREF GND A Type V OUT D a s h lin e ... V S o lid lin e ... V V IN IN fro m fro m H L O I (R) (R) L H I O V DET V V HYS DET 1 .0 5 IN Pin Assignment T O -9 2 S O T -8 9 S O T -2 5 NC 7 0 X X A -1 F r o n t V ie w 7 0 X X A -1 0XXA T o p V ie w NC OUT OUTVDD VSS VDD VSS OUT VDD VSS B o tto m V ie w OUT VDD VSS OUT VDD VSS Rev. 1.10 2 October 15, 2003 HT70XXA-1 Absolute Maximum Ratings Supply Voltage .............................................................................................................................VSS-0.3V to VSS+26V Output Voltage ...........................VSS-0.3V to VDD+0.3V Storage Temperature ............................-50C to 125C Operating Temperature ...............................0C to 70C 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. Output Current......................................................50mA Power Consumption ..........................................200mW Electrical Characteristics HT7024A-1 Symbol VDET VHYS IDD VDD IOL DVDET DTa HT7027A-1 Symbol VDET VHYS IDD VDD IOL DVDET DTa Parameter Detection Voltage Hysteresis Width Operating Current Operating Voltage Output Sink Current Temperature Coefficient Test Conditions VDD 3/4 3/4 8V 3/4 2V 3/4 Conditions 3/4 3/4 No load 3/4 VOUT=0.2V 0C Rev. 1.10 3 October 15, 2003 HT70XXA-1 HT7033A-1 Symbol VDET VHYS IDD VDD IOL DVDET DTa HT7039A-1 Symbol VDET VHYS IDD VDD IOL DVDET DTa HT7044A-1 Symbol VDET VHYS IDD VDD IOL DVDET DTa Parameter Detection Voltage Hysteresis Width Operating Current Operating Voltage Output Sink Current Temperature Coefficient Test Conditions VDD 3/4 3/4 8V 3/4 3.6V 3/4 Conditions 3/4 3/4 No load 3/4 VOUT=0.36V 0C Ta=25C Unit V V mA V mA mV/C Rev. 1.10 4 October 15, 2003 HT70XXA-1 HT7050A-1 Symbol VDET VHYS IDD VDD IOL DVDET DTa Parameter Detection Voltage Hysteresis Width Operating Current Operating Voltage Output Sink Current Temperature Coefficient Test Conditions VDD 3/4 3/4 8V 3/4 3.6V 3/4 No load 3/4 VOUT=0.36V 0C The HT70XXA-1 series is a set of voltage detectors equipped with a high stability voltage reference which is connected to the negative input of a comparator3/4 denoted as VREF in the following figure for NMOS output voltage detector. When the voltage drop to the positive input of the comparator (i,e,VB) is higher than VREF, VOUT goes high, M1 turns off, and VB is expressed as VBH=VDD (RB+RC) / (RA+RB+RC). If VDD is decreased so that VB falls to a value less than VREF, the comparator output inverts from high to low, VOUT goes low, VC is high, M1 turns on, RC is bypassed, and V B becomes: VBL=VDDRB / (RA+RB), which is less than VBH. By so doing, the comparator output will stay low to prevent the circuit from oscillating when VB VREF. If VDD falls below the minimum operating voltage, the output becomes undefined. When VDD goes from low to VDD RB / (RA+RB) > VREF, the comparator output and VOUT goes high. V The hysteresis width is: VHYS = VDET (+) - VDET (-) The figure demonstrates the NMOS output type with positive output polarity (VOUT 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 DD R A C o m p a ra to r V B REF RL V C V MN OUT R B M1 R C The detectable voltage is defined as: VDET (-) = RA + RB + RC VREF RB + RC V SS The release voltage is defined as: VDET (+) = RA + RB VREF RB NMOS Output Voltage Detector (HT70XXA-1) Rev. 1.10 5 October 15, 2003 HT70XXA-1 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-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: V IN R D power supply V DD1 V V OUT DD2 V C DD V OUT V H T 7 0 4 4 A -1 OUT H T 7 0 X X A -1 RESET M ic r o C o m p u te r V SS V V DD SS V SS * NMOS open drain output application with R-C delay V R H T 7 0 X X A -1 V OUT DD M ic r o C o m p u te r t V OUT C V SS t 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 5 V P o w e r lin e R D V C DD V H T 7 0 4 4 A -1 OUT V SS V SS Rev. 1.10 6 October 15, 2003 HT70XXA-1 * with 5V voltage regulator 5 V V o lta g e r e g u la to r V IN Malfunction Analysis The following circuit demonstrates the way a circuit analyzes malfunctions by monitoring the variation or spike noise of power supply voltage. V DD H T 7 1 5 0 -1 GND 5V V DD V H T 7 0 4 4 A -1 V V OUT OUT H T 7 0 X X A -1 SS V SS V SS 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- 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. vider V IN R A V DD V V OUT DD S o la r C e ll V Tr OUT BATT Load R B H T 7 0 X X A -1 V SS V SS V SS H T 7 0 X X A -1 RA + RB VDET RB RA + RB Hysteresis width = VHYS RB Detectable voltage = * Varying the detectable voltage with a diode V IN V f1 V f2 V DD V H T 7 0 X X A -1 V SS OUT V SS Detectable Voltage = Vf1+Vf2+VDET Rev. 1.10 7 October 15, 2003 HT70XXA-1 Level Selector The following diagram illustrates a logic level selector. V DD V OUT V OUT V OUT H T 7 0 3 9 A -1 V SS H T 7 0 5 0 A -1 V DET1 V DET2 V DD 5 .0 V V DET1 3 .9 V V DET2 t V OUT t Rev. 1.10 8 October 15, 2003 HT70XXA-1 Package Information 3-Pin TO-92 Outline Dimensions A B D C E F G H Symbol A B C D E F G H I a Dimensions in mil Min. 170 170 500 11 90 45 45 130 8 4 Nom. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 3/4 Max. 200 200 3/4 20 110 55 65 160 18 6 Rev. 1.10 9 October 15, 2003 HT70XXA-1 3-Pin SOT-89 Outline Dimensions A B I J E C D G F H Symbol A B C D E F G H I J Dimensions in mil Min. 173 64 90 35 155 14 17 3/4 55 14 Nom. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 59 3/4 3/4 Max. 181 72 102 47 167 19 22 3/4 63 17 Rev. 1.10 10 October 15, 2003 HT70XXA-1 5-Pin SOT-25 Outline Dimensions D C L E H e A2 b A1 A Symbol A A1 A2 b C D E e H L q Dimensions in mm Min. 1.00 3/4 0.70 0.35 0.10 2.70 1.40 3/4 2.60 0.37 1 Nom. 3/4 3/4 3/4 3/4 3/4 3/4 3/4 1.90 3/4 3/4 3/4 Max. 1.30 0.10 0.90 0.50 0.25 3.10 1.80 3/4 3 3/4 9 Rev. 1.10 11 q October 15, 2003 HT70XXA-1 Product Tape and Reel Specifications TO-92 Reel Dimensions (Unit: mm) P ackage U p, 30 F la t S id e U p P ackage U p, F la t S id e D o w n 58 88 360 43 Rev. 1.10 12 October 15, 2003 HT70XXA-1 SOT-89, SOT-25 Reel Dimensions T2 D A B C T1 SOT-89 Symbol A B C D T1 T2 SOT-25 Symbol A B C D T1 T2 Description Reel Outer Diameter Reel Inner Diameter Spindle Hole Diameter Key Slit Width Space Between Flange Reel Thickness Dimensions in mm 1781.0 621.0 13.00.2 2.50.25 8.4+1.5 -0.0 11.4+1.5 Description Reel Outer Diameter Reel Inner Diameter Spindle Hole Diameter Key Slit Width Space Between Flange Reel Thickness Dimensions in mm 1801.0 621.5 12.75+0.15 1.90.15 12.4+0.2 17-0.4 Rev. 1.10 13 October 15, 2003 HT70XXA-1 TO-92 Carrier Tape Dimensions P Dh H1 H H0 l1 W2 W0 t W1 W F1 P2 P0 F2 D0 TO-92 Symbol I1 P P0 P2 F1 F2 Dh W W0 W1 W2 H0 H1 D0 t H Note: Description Taped Lead Length Component Pitch Perforation Pitch Component to Perforation (Length Direction) Lead Spread Lead Spread Component Alignment Carrier Tape Width Hold-down Tape Width Perforation Position Hold-down Tape Position Lead Clinch Height Component Height Perforation Diameter Taped Lead Thickness Component Base Height Dimensions in mm (2.5) 12.71.0 12.70.3 6.350.4 2.5+0.4 -0.1 2.5+0.4 -0.1 00.1 18.0+1.0 -0.5 6.00.5 9.00.5 (0.5) 16.00.5 Less than 24.7 4.00.2 0.70.2 19.00.5 Thickness less than 0.380.05mm~0.5mm P0 Accumulated pitch tolerance: 1mm/20pitches. ( ) Bracketed figures are for consultation only Rev. 1.10 14 October 15, 2003 HT70XXA-1 SOT-89, SOT-25 Carrier Tape Dimensions D E F W C P0 P1 t B0 D1 P K0 A0 SOT-89 Symbol W P E F D D1 P0 P1 A0 B0 K0 t C SOT-25 Symbol W P E F D D1 P0 P1 A0 B0 K0 t C Description Carrier Tape Width Cavity Pitch Perforation Position Cavity to Perforation (Width Direction) Perforation Diameter Cavity Hole Diameter Perforation Pitch Cavity to Perforation (Length Direction) Cavity Length Cavity Width Cavity Depth Carrier Tape Thickness Cover Tape Width Dimensions in mm 8.00.3 4.0 1.75 3.50.05 1.5+0.1 1.5+0.1 4.0 2.0 3.15 3.2 1.4 0.200.03 5.3 Description Carrier Tape Width Cavity Pitch Perforation Position Cavity to Perforation (Width Direction) Perforation Diameter Cavity Hole Diameter Perforation Pitch Cavity to Perforation (Length Direction) Cavity Length Cavity Width Cavity Depth Carrier Tape Thickness Cover Tape Width Dimensions in mm 12.0+0.3 -0.1 8.00.1 1.750.1 5.50.05 1.5+0.1 1.5+0.1 4.00.1 2.00.10 4.80.1 4.50.1 1.80.1 0.300.013 9.3 Rev. 1.10 15 October 15, 2003 HT70XXA-1 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. (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 (Shanghai) Inc. 7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China Tel: 021-6485-5560 Fax: 021-6485-0313 http://www.holtek.com.cn Holtek Semiconductor (Hong Kong) Ltd. Block A, 3/F, Tin On Industrial Building, 777-779 Cheung Sha Wan Rd., Kowloon, Hong Kong Tel: 852-2-745-8288 Fax: 852-2-742-8657 Holmate Semiconductor, Inc. 46712 Fremont Blvd., Fremont, CA 94538 Tel: 510-252-9880 Fax: 510-252-9885 http://www.holmate.com Copyright O 2003 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 modification, nor recommends the use of its products for application that may present a risk to human life due to malfunction or otherwise. Holteks 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. Rev. 1.10 16 October 15, 2003 |
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