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HT70XX Voltage Detector
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
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 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. HT7022A HT7024A HT7027A HT7033A HT7039A HT7044A HT7050A HT7070A Note: Detectable Voltage 2.2V 2.4V 2.7V 3.3V 3.9V 4.4V 5.0V 7.0V Hysteresis Width 0.11V 0.12V 0.135V 0.165V 0.195V 0.22V 0.25V 0.35V Tolerance 5% 5% 5% 5% 5% 5% 5% 5%
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 VDD Type VOUT A VDD>VDET(+) Hi-Z VDDVDET(-) VSS
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Block Diagram
N channel open drain output (normal open; active low)
VDD
VOUT
VREF
GND
A type
VOUT
VDET VHYS
VIN
Pin Assignment
T O -9 2 H T70XX
. r o n t V ie w
S O T -8 9
OUTVDD
VSS B o tto m V ie w OUT VDD VSS
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Pad Assignment
HT70XX (except HT7022A)
Pad Coordinates
HT70XX (except HT7022A) Pad No. 1
(0 ,0 )
Unit: mm Y -379.50 -399.50 -386.00 Unit: mm
X -483.30 -234.60 443.90
2 3
1 2 VOUT
3 GND
HT7022A only Pad No. 1 X -434.34 120.65 774.70 Y
Chip size: 1317 1158 (mm)2 * The IC substrate should be connected to VDD in the PCB layout artwork. HT7022A only
OUT VDD VSS
V IN
1 2
(0 ,0 )
394.97 461.01 412.75
2 3
3
Chip size: 2032 1321 (mm)2 * The IC substrate should be connected to VDD in the PCB layout artwork.
Absolute Maximum Ratings
Supply Voltage, except HT7022A ..................................................................................................VSS-0.3V to VSS+26V Supply Voltage, HT7022A only ....................................................................................................................-0.3V to 13V 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
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Electrical Characteristics
HT7022A Symbol Parameter Hi(R)Lo Detectable Voltage Lo(R)Hi Detectable Voltage VHYS IDD VDD IOL DVDET DTa HT7024A Symbol Parameter Hi(R)Lo Detectable Voltage Lo(R)Hi Detectable Voltage VHYS IDD VDD IOL DVDET DTa HT7027A Symbol Parameter Hi(R)Lo Detectable Voltage Lo(R)Hi Detectable Voltage VHYS IDD VDD IOL DVDET DTa Hysteresis Width Operating Current Operating Voltage Output Sink Current Temperature Coefficient Test Conditions VDD 3/4 3/4 3/4 8V 3/4 2V 3/4 Conditions 3/4 3/4 3/4 No load 3/4 VOUT=0.2V 0CVDET
Ta=25C Unit V V V mA V mA mV/C
VDET
Ta=25C Unit V V V mA V mA mV/C
VDET
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HT7033A Symbol Parameter Hi(R)Lo Detectable Voltage Lo(R)Hi Detectable Voltage VHYS IDD VDD IOL DVDET DTa HT7039A Symbol Parameter Hi(R)Lo Detectable Voltage Lo(R)Hi Detectable Voltage VHYS IDD VDD IOL DVDET DTa HT7044A Symbol Parameter Hi(R)Lo Detectable Voltage Lo(R)Hi Detectable Voltage VHYS IDD VDD IOL DVDET DTa Hysteresis Width Operating Current Operating Voltage Output Sink Current Temperature Coefficient Test Conditions VDD 3/4 3/4 3/4 8V 3/4 3.6V 3/4 Conditions 3/4 3/4 3/4 No load 3/4 VOUT=0.36V 0CVDET
Ta=25C Unit V V V mA V mA mV/C
VDET
Ta=25C Unit V V V mA V mA mV/C
VDET
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HT70XX
HT7050A Symbol Parameter Hi(R)Lo Detectable Voltage Lo(R)Hi Detectable Voltage VHYS IDD VDD IOL DVDET DTa HT7070A Symbol Parameter Hi(R)Lo Detectable Voltage Lo(R)Hi Detectable Voltage VHYS IDD VDD IOL DVDET DTa Hysteresis Width Operating Current Operating Voltage Output Sink Current Temperature Coefficient Test Conditions VDD 3/4 3/4 3/4 8V 3/4 5V 3/4 No load 3/4 VOUT=0.5V 0CVDET
Ta=25C Unit V V V mA V mA mV/C
VDET
Functional Description
The HT70XX 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. The detectable voltage is defined as: VDET (-) = RA + RB + RC VREF RB + RC RA + RB VREF RB
The release voltage is defined as: VDET (+) =
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HT70XX
The hysteresis width is: VHYS = VDET (+) - VDET (-)
R
A
V
DD
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 circuits shown are examples of positive output polarity (normally open, active low) unless otherwise specified.
V
C o m p a ra to r V
B RE.
RL V
C
V MN
OUT
R
B
M1 R
C
V
SS
NMOS output voltage detector (HT70XXA)
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 HT70XX 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
H T70XXA
RESET
M ic r o c o m p u te r
V
OUT
V
V
H T7044A
SS
V
SS
V
SS
DD
* NMOS open drain output application with R-C delay
V R
DD
H T70XXA
V
OUT
M ic r o c o m p u te r
t V
OUT
C V
SS
t
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5V power line monitoring circuit Generally, a minimum operating voltage of 4.5V is guaranteed in a 5V power line system. The HT7044A 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
* Varying the detectable voltage with a diode
V
IN
V f1 V f2 V
DD
V
OUT
H T70XXA
V
V
DD
SS
V
SS
C V
Detectable Voltage = Vf1+Vf2+VDET
OUT
H T7044A
V
SS
Malfunction analysis
V
SS
The following circuit demonstrates the way a circuit analyzes malfunctions by monitoring the variation or spike noise of power supply voltage.
V V
OUT DD
* with 5V voltage regulator
5 V V o lta g e r e g u la to r V
IN
H T7150
GND
5V
H T70XXA
V
DD
V
SS
V
SS
V
OUT
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.
H T7044A
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-
V S o la r C e ll V Tr
OUT
DD
vider
V
IN
BATT
Load
R
A
V
DD
V
V
OUT
SS
H T70XXA
R
B
H T70XXA
V
SS
V
SS
RA + RB VDET RB RA + RB Hysteresis width = VHYS RB Detectable voltage =
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HT70XX
Level selector The following diagram illustrates a logic level selector.
VDD OUT
VOUT
VOUT
HT7039A
VSS VDD VDET2
HT7050A
VDET1
5 .0 V
VDET1
3 .9 V
VDET2
OUT
t
t
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HT70XX
Package Information
3-pin TO-92 outline dimensions
A
B
D C
E . 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
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3-pin SOT-89 outline dimensions
A B
I J
E
C
D
G . 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
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Product Tape and Reel Specifications
TO-92 reel dimensions (Unit: mm)
P ackage U p, 30
. la t S id e U p
P ackage U p,
. la t S id e D o w n
58 88 360
43
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HT70XX
SOT-89 reel dimensions
T2 D
A
B
C
T1
SOT-89 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 1801.0 621.5 12.75+0.15 1.90.15 12.4+0.2 17-0.4
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HT70XX
TO-92 carrier tape dimensions
P ,h
H1 H H0 l1
W2 W0 t W1 W
.1 P2 P0
.2 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
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HT70XX
SOT-89 carrier tape dimensions
D
E . 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 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
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HT70XX
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 http://www.holtek.com.tw 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 (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. 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 Holmate Semiconductor, Inc. 48531 Warm Springs Boulevard, Suite 413, Fremont, CA 94539 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. 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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