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Features
* Low power consumption * Low temperature coefficient * High input voltage range (up to 24V)
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HT70XXA-1 Voltage Detector
* Output voltage accuracy: tolerance 3% * Built-in hysteresis characteristic * TO-92, SOT-89 and SOT-25 package
* 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.
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
Package
XX stands for output voltages. For lead free devices, TO-92 package will add a # mark at the end of the date code, whereas SOT-89 & SOT-25 packages will add a # mark at the end of the marking.
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TO-92 SOT-89 SOT-25
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Marking
70XXA-1 (for TO-92) 70XXA-1 (for SOT-89) 0XXA (for SOT-25)
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Block Diagram
N Channel Open Drain Output (Normal Open; Active Low)
VDD
VOUT
VREF
GND
Output Table & Curve
VDD VOUT VDD>VDET(+) Hi-Z VDDVDET(-) VSS
V
OUT
D a s h lin e ... V S o lid lin e ... V V
IN IN
fro m L fro m H
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
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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 ...........................-40C to 85C 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 0CTa=25C Unit V V mA V mA mV/C
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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 0CTa=25C Unit V V mA V mA mV/C
Ta=25C Unit V V mA V mA mV/C
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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 0CFunctional Description
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)
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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
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* 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
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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
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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
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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
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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
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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
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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
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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
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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
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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. (Taipei 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 Inc. (Shanghai Sales Office) 7th Floor, Building 2, No.889, Yi Shan Rd., Shanghai, China 200233 Tel: 021-6485-5560 Fax: 021-6485-0313 http://www.holtek.com.cn Holtek Semiconductor Inc. (Shenzhen Sales Office) 43F, SEG Plaza, Shen Nan Zhong Road, Shenzhen, China 518031 Tel: 0755-8346-5589 Fax: 0755-8346-5590 ISDN: 0755-8346-5591 Holtek Semiconductor Inc. (Beijing Sales Office) Suite 1721, Jinyu Tower, A129 West Xuan Wu Men Street, Xicheng District, Beijing, China 100031 Tel: 010-6641-0030, 6641-7751, 6641-7752 Fax: 010-6641-0125 Holmate Semiconductor, Inc. (North America Sales Office) 46712 Fremont Blvd., Fremont, CA 94538 Tel: 510-252-9880 Fax: 510-252-9885 http://www.holmate.com
Copyright O 2005 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.
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