Data Sheet

TinyPower
TM
HT70xxA-1
Voltage Detector
Features
General Description
• Low power consumption
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
5.0V. 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.
• Low temperature coefficient
• High input voltage range (up to 30V)
• Quiescent current 3μA
• Output voltage accuracy: tolerance ±3%
• Built-in hysteresis characteristic
• TO92, SOT89, SOT23 and SOT23-5 package
Although designed primarily as fixed voltage
detectors, these devices can be used with external
components to detect user specified threshold voltages.
Applications
• Battery checkers
• Level selectors
• Power failure detectors
• Microcomputer reset
• Battery memory backup
• Non-volatile RAM signal storage protectors
Selection Table
Part No.
Detectable
Voltage
Hysteresis
Width
HT7022A-1
2.2V
0.110V
HT7024A-1
2.4V
0.120V
HT7027A-1
2.7V
0.135V
HT7033A-1
3.3V
0.165V
HT7039A-1
3.9V
0.195V
HT7044A-1
4.4V
0.220V
HT7050A-1
5.0V
0.250V
Tolerance
Package
Marking
±3%
TO92
SOT89
SOT23
SOT23-5
70xxA-1 (for TO92)
70xxA-1 (for SOT89)
0xxA (for SOT23)
0xxA (for SOT23-5)
Note: ″xx″ stands for detectable voltages.
Rev. 2.10
1
March 19, 2014
HT70xxA-1
Block Diagram
N Channel Open Drain Output (Normal Open; Active Low)
Output Table & Curve
V
VDD
VDD>VDET(+)
VDD≤VDET(−)
VOUT
Hi-Z
VSS
O U T
D a s h lin e ... V
S o lid lin e ... V
V
V
D E T
V
D E T
V
1 .0 5
IN
IN
fro m L
fro m H
O
I
H
L O
I
IN
H Y S
Pin Assignment
Rev. 2.10
2
March 19, 2014
HT70xxA-1
Absolute Maximum Ratings
Supply Voltage ....................................................VSS−0.3V to VSS+33V
Power Consumption.................................................................. 200mW
Output Voltage................................................... VSS−0.3V to VDD+0.3V
Storage Temperature.................................................... −50°C to 125°C
Output Current............................................................................. 50mA
Operating Temperature.................................................. −40°C to 85°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 reliability.
Electrical Characteristics
HT7022A-1
Ta=25°C
Symbol
Parameter
Test Conditions
VDD
Conditions
Min.
Typ.
Max.
Unit
V
VDET
Detection Voltage
—
—
2.134
2.200
2.266
VHYS
Hysteresis Width
—
—
0.02VDET
0.05VDET
0.10VDET
V
IDD
Operating Current
3.2V
—
3
6
µA
VDD
Operating Voltage
1.5
—
30
V
IOL
Output Sink Current
1
2
—
mA
—
±100
—
ppm/°C
Temperature Coefficient
No load
—
—
VDET–0.2V VOUT=0.2V
—
-40°C<Ta<85°C
HT7024A-1
Ta=25°C
Symbol
Parameter
Test Conditions
VDD
Conditions
Min.
Typ.
Max.
Unit
V
VDET
Detection Voltage
—
—
2.328
2.400
2.472
VHYS
Hysteresis Width
—
—
0.02VDET
0.05VDET
0.10VDET
V
IDD
Operating Current
3.4V
—
3
6
µA
VDD
Operating Voltage
1.5
—
30
V
IOL
Output Sink Current
1
2
—
mA
—
±100
—
ppm/°C
Rev. 2.10
Temperature Coefficient
No load
—
—
VDET–0.2V VOUT=0.2V
—
-40°C<Ta<85°C
3
March 19, 2014
HT70xxA-1
HT7027A-1
Ta=25°C
Symbol
Parameter
Test Conditions
VDD
Conditions
Min.
Typ.
Max.
Unit
V
VDET
Detection Voltage
—
—
2.619
2.700
2.781
VHYS
Hysteresis Width
—
—
0.02VDET
0.05VDET
0.10VDET
V
IDD
Operating Current
3.7V
—
3
6
µA
VDD
Operating Voltage
1.5
—
30
V
IOL
Output Sink Current
1
2
—
mA
—
±100
—
ppm/°C
Temperature Coefficient
No load
—
—
VDET–0.2V VOUT=0.2V
—
-40°C<Ta<85°C
HT7033A-1
Ta=25°C
Symbol
Parameter
Test Conditions
VDD
Conditions
Min.
Typ.
Max.
Unit
V
VDET
Detection Voltage
—
—
3.201
3.300
3.399
VHYS
Hysteresis Width
—
—
0.02VDET
0.05VDET
0.10VDET
V
IDD
Operating Current
4.3V
—
3
6
µA
VDD
Operating Voltage
1.5
—
30
V
IOL
Output Sink Current
2
4
—
mA
—
±100
—
ppm/°C
Temperature Coefficient
No load
—
—
VDET–0.2V VOUT=0.25V
—
-40°C<Ta<85°C
HT7039A-1
Ta=25°C
Symbol
Parameter
Test Conditions
VDD
Conditions
Min.
Typ.
Max.
Unit
V
VDET
Detection Voltage
—
—
3.783
3.900
4.017
VHYS
Hysteresis Width
—
—
0.02VDET
0.05VDET
0.10VDET
V
IDD
Operating Current
4.9V
—
3
6
µA
VDD
Operating Voltage
1.5
—
30
V
IOL
Output Sink Current
2
4
—
mA
—
±100
—
ppm/°C
Rev. 2.10
Temperature Coefficient
No load
—
—
VDET–0.2V VOUT=0.25V
—
-40°C<Ta<85°C
4
March 19, 2014
HT70xxA-1
HT7044A-1
Ta=25°C
Symbol
Parameter
Test Conditions
VDD
Conditions
VDET
Detection Voltage
—
—
VHYS
Hysteresis Width
—
—
IDD
Operating Current
5.4V
VDD
Operating Voltage
IOL
Output Sink Current
Temperature Coefficient
No load
—
—
VDET–0.2V VOUT=0.36V
—
-40°C<Ta<85°C
Min.
Typ.
Max.
Unit
4.268
4.400
4.532
V
0.02VDET 0.05VDET 0.10VDET
V
—
3
6
µA
1.5
—
30
V
4
7
—
mA
—
±100
—
ppm/°C
HT7050A-1
Ta=25°C
Symbol
Parameter
Test Conditions
VDD
Conditions
VDET
Detection Voltage
—
—
VHYS
Hysteresis Width
—
—
IDD
Operating Current
6.0V
VDD
Operating Voltage
IOL
Output Sink Current
Rev. 2.10
Temperature Coefficient
No load
—
—
VDET–0.2V VOUT=0.36V
—
-40°C<Ta<85°C
5
Min.
Typ.
Max.
Unit
4.850
5.000
5.150
V
0.02VDET 0.05VDET 0.10VDET
V
—
3
6
µA
2.1
—
30
V
4
7
—
mA
—
±100
—
ppm/°C
March 19, 2014
HT70xxA-1
Typical Performance Characteristics
Detection Voltage vs Temperature
HT7022A-1
2.60
Falling Curve
Detection Voltage (V)
2.50
Rising Curve
2.40
2.30
2.20
2.10
2.00
-40
-30
-20
-10
0
10
20
30
Temperature(OC)
40
50
60
70
80
40
50
60
70
80
40
50
60
70
80
Hysteresis Width vs Temperature
HT7022A-1
Hysteresis Width (V)
0.20
0.15
0.10
0.05
0.00
-40
-30
-20
-10
0
10
20
30
Temperature(OC)
Operating Current vs Temperature
HT7022A-1
Operation Current (uA)
6.00
VDD=3.2V
5.00
4.00
3.00
2.00
1.00
0.00
-40
-30
-20
-10
0
10
20
30
Temperature(OC)
Output Sink Current vs Temperature
HT7022A-1
Output Sink Current (mA)
6.0
5.0
4.0
3.0
2.0
1.0
0.0
Rev. 2.10
-40
-30
-20
-10
0
10
20
30
Temperature(OC)
6
40
50
60
70
80
March 19, 2014
HT70xxA-1
Functional 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 comparator
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,V B) is higher than V REF, V OUT
goes high, M1 turns off, and V B 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 VB becomes:
VBL=VDD×RB/(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.
NMOS Output Voltage Detector
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 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.
The detectable voltage is defined as:
VDET (−) = (RA+RB+RC) / (RB+RC) × VREF
The release voltage is defined as:
VDET (+) = (RA+RB) / RB × VREF
The hysteresis width is:
VHYS = VDET (+) − VDET (−)
Rev. 2.10
7
March 19, 2014
HT70xxA-1
Application Circuits
Power-on Reset Circuit
Microcomputer 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:
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
Rev. 2.10
8
March 19, 2014
HT70xxA-1
5V Power Line Monitoring Circuit
• Varying the detectable voltage with a diode
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
Detectable voltage=Vf1+Vf2+VDET
Malfunction Analysis
The following circuit demonstrates the way a circuit analyzes
malfunctions by monitoring the variation or spike noise of power
supply voltage.
• with 5V voltage regulator
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.
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
divider
Charge Monitoring Circuit
Detectable voltage=(RA+RB)/RB×VDET
Hysteresis width=(RA+RB)/RB×VHYS
Rev. 2.10
9
March 19, 2014
HT70xxA-1
Level Selector
The following diagram illustrates a logic level selector.
Rev. 2.10
10
March 19, 2014
HT70xxA-1
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
Rev. 2.10
11
March 19, 2014
HT70xxA-1
3-pin TO92 Outline Dimensions
Symbol
Min.
Nom.
Max.
A
0.173
0.180
0.205
B
0.170
—
0.210
C
0.500
0.580
—
D
—
0.015 BSC
—
E
—
0.010 BSC
—
F
—
0.050 BSC
—
G
—
0.035 BSC
—
H
0.125
0.142
0.165
Symbol
Rev. 2.10
Dimensions in inch
Dimensions in mm
Min.
Nom.
Max.
A
4.39
4.57
5.21
B
4.32
—
5.33
C
12.70
14.73
—
D
—
0.38 BSC
—
E
—
2.54 BSC
—
F
—
1.27 BSC
—
G
—
0.89 BSC
—
H
3.18
3.61
4.19
12
March 19, 2014
HT70xxA-1
3-pin SOT89 Outline Dimensions
Symbol
Dimensions in inch
Min.
Nom.
Max.
A
0.173
—
0.181
B
0.053
—
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 BSC
—
I
0.055
—
0.063
J
0.014
—
0.017
Symbol
Rev. 2.10
Dimensions in mm
Min.
Nom.
Max.
A
4.40
—
4.60
B
1.35
—
1.83
C
2.29
—
2.60
D
0.89
—
1.20
E
3.94
—
4.25
F
0.36
—
0.48
G
0.44
—
0.56
H
—
1.50 BSC
—
I
1.40
—
1.60
J
0.35
—
0.44
13
March 19, 2014
HT70xxA-1
3-pin SOT23-3 Outline Dimensions
Symbol
Nom.
Max.
A
—
—
0.057
A1
—
—
0.006
A2
0.035
0.045
0.051
b
0.012
—
0.020
C
0.003
—
0.009
D
—
0.114 BSC
—
E
—
0.063 BSC
—
e
—
0.037 BSC
—
e1
—
0.075 BSC
—
H
—
0.110 BSC
—
L1
—
0.024 BSC
—
θ
0°
—
8°
Symbol
Rev. 2.10
Dimensions in inch
Min.
Dimensions in mm
Min.
Nom.
Max.
A
—
—
1.45
A1
—
—
0.15
A2
0.90
1.15
1.30
b
0.30
—
0.50
C
0.08
—
0.22
D
—
2.90 BSC
—
E
—
1.60 BSC
—
e
—
0.95 BSC
—
e1
—
1.90 BSC
—
H
—
2.80 BSC
—
L1
—
0.60 BSC
—
θ
0°
—
8°
14
March 19, 2014
HT70xxA-1
5-pin SOT23-5 Outline Dimensions
Symbol
A
Min.
Nom.
Max.
—
—
0.057
A1
—
—
0.006
A2
0.035
0.045
0.051
b
0.012
—
0.020
C
0.003
—
0.009
D
—
0.114 BSC
—
E
—
0.063 BSC
—
e
—
0.037 BSC
—
e1
—
0.075 BSC
—
H
—
0.110 BSC
—
L1
—
0.024 BSC
—
θ
0°
—
8°
Symbol
A
Rev. 2.10
Dimensions in inch
Dimensions in mm
Min.
Nom.
Max.
—
—
1.45
A1
—
—
0.15
A2
0.90
1.15
1.30
b
0.30
—
0.50
C
0.08
—
0.22
D
—
2.90 BSC
—
E
—
1.60 BSC
—
e
—
0.95 BSC
—
e1
—
1.90 BSC
—
H
—
2.80 BSC
—
L1
—
0.60 BSC
—
θ
0°
—
8°
15
March 19, 2014
HT70xxA-1
Copyright© 2014 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's 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. 2.10
16
March 19, 2014