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PDF HT7033A-1 Data sheet ( Hoja de datos )
| Número de pieza | HT7033A-1 | |
| Descripción | (HT70xxA-1) Voltage Detector | |
| Fabricantes | Holtek Microelectronics | |
| Logotipo |  |
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t4U.com VoltagHeT7D0eXteXcAto-1rFeatures
e· Low power consumption
e· Low temperature coefficient
h· High input voltage range (up to 24V)
ataSApplications
.D · Battery checkers
· Level selectors
w · Power failure detectors
· Output voltage accuracy: tolerance ± 3%
· Built-in hysteresis characteristic
· TO-92, SOT-89 and SOT-25 package
· Microcomputer reset
· Battery memory backup
· Non-volatile RAM signal storage protectors
ww mGeneral Description
The HT70XXA-1 series is a set of three-terminal low
opower voltage detectors implemented in CMOS technol-
.cogy. Each voltage detector in the series detects a partic-
ular fixed voltage ranging from 2.4V to 5V. The voltage
detectors consist of a high-precision and low power con-
sumption standard voltage source, a comparator, hys-
Uteresis 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.
t4Selection Table
eePart No.
Detectable
Voltage
HT7024A-1
2.4V
hHT7027A-1
2.7V
SHT7033A-1
3.3V
taHT7039A-1
3.9V
HT7044A-1
4.4V
aHT7050A-1
5.0V
Hysteresis
Width
0.12V
0.135V
0.165V
0.195V
0.22V
0.25V
Package
TO-92
SOT-89
SOT-25
Marking
70XXA-1 (for TO-92)
70XXA-1 (for SOT-89)
0XXA (for SOT-25)
.DNote:
²XX² stands for output voltages.
For lead free devices, TO-92 package will add a ²#² mark at the end of the date code, whereas SOT-89 &
SOT-25 packages will add a ²#² mark at the end of the marking.
www www.DataSheet4U.comRev.1.30
1 January 26, 2005
1 page  
HT7050A-1
Symbol
Parameter
VDET
VHYS
IDD
VDD
IOL
DVDET
DTa
Detection Voltage
Hysteresis Width
Operating Current
Operating Voltage
Output Sink Current
Temperature Coefficient
Test Conditions
VDD Conditions
¾¾
¾¾
8V No load
¾¾
3.6V VOUT=0.36V
¾ 0°C<Ta<70°C
HT70XXA-1
Ta=25°C
Min. Typ. Max. Unit
4.850
0.02
VDET
¾
2.1
3
5.000
0.05
VDET
4
¾
6
5.150
0.1
VDET
7
24
¾
V
V
mA
V
mA
¾ ±0.9 ¾ mV/°C
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 comparator¾ de-
noted as VREF in the following figure for NMOS output
voltage detector.
When the voltage drop to the positive input of the com-
parator (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 in-
verts 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.
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
RB + RC
´
VREF
The release voltage is defined as:
VDET
(+)
=
RA + RB
RB
´
VREF
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
RA
C o m p a ra to r
RL
VC
V B V OUT
V REF
RB
MN
M1
RC
V SS
NMOS Output Voltage Detector (HT70XXA-1)
Rev. 1.30
5 January 26, 2005
5 Page 
5-Pin SOT-25 Outline Dimensions
D
E
e
C
L
H
A2
Symbol
A
A1
A2
b
C
D
E
e
H
L
q
b
Min.
1.00
¾
0.70
0.35
0.10
2.70
1.40
¾
2.60
0.37
1°
A
A1
Dimensions in mm
Nom.
¾
¾
¾
¾
¾
¾
¾
1.90
¾
¾
¾
HT70XXA-1
Max.
1.30
0.10
0.90
0.50
0.25
3.10
1.80
¾
3
¾
9°
Rev. 1.30
11 January 26, 2005
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet HT7033A-1.PDF ] | |
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