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PDF HT7044A Data sheet ( Hoja de datos )
| Número de pieza | HT7044A | |
| Descripción | Voltage Detector | |
| Fabricantes | Holtek Semiconductor Inc | |
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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 2.4V to 7V. The voltage detectors consist of
a high-precision and low power consumption
standard voltage source, a comparator, hyster-
esis circuit, and an output driver. CMOS tech-
nology ensures low power consumption.
Although designed primarily as fixed voltage
detectors, these devices can be used with exter-
nal components to detect user specified thresh-
old voltages (NMOS open drain type only).
Selection Table
Part No.
HT7024A
HT7027A
HT7033A
HT7039A
HT7044A
HT7050A
HT7070A
Detectable Voltage
2.4V
2.7V
3.3V
3.9V
4.4V
5V
7V
Hysteresis Width
0.12V
0.135V
0.165V
0.195V
0.22V
0.25V
0.35V
Tolerance
±5%
±5%
±5%
±5%
±5%
±5%
±5%
Note: The output type selection codes are:
NMOS open drain normal open, active low
PMOS open drain normal open, active high
For example: The HT7070A is a 7V, NMOS open drain active low output
1 May 3, 2000
1 page  
HT70XX
HT7033A
Symbol
Parameter
VDET
Hi®Lo Detectable Voltage
Lo®Hi Detectable Voltage
Test Conditions
VDD Conditions
¾¾
¾¾
VHYS
Hysteresis Width
¾¾
IDD
VDD
IOL
DVDET
DTA
Operating Current
Operating Voltage
Output Sink Current
Temperature Coefficient
8 No load
¾¾
2.5 VOUT=0.25V
¾ 0°C<Ta<70°C
Min.
3.135
3.197
0.02
VDET
¾
1.5
1.2
¾
Typ.
3.3
3.465
0.05
VDET
4
¾
2.5
±0.9
Ta=25°C
Max. Unit
3.465
3.811
0.1
VDET
7
24
¾
V
V
V
mA
V
mA
¾ mV/°C
HT7039A
Symbol
Parameter
VDET
Hi®Lo Detectable Voltage
Lo®Hi Detectable Voltage
Test Conditions
VDD Conditions
¾¾
¾¾
VHYS
Hysteresis Width
¾¾
IDD
VDD
IOL
DVDET
DTA
Operating Current
Operating Voltage
Output Sink Current
Temperature Coefficient
8 No load
¾¾
2.5 VOUT=0.25V
¾ 0°C<Ta<70°C
Min.
3.705
3.779
0.02
VDET
¾
1.5
1.2
¾
Typ.
3.9
4.095
0.05
VDET
4
¾
2.5
±0.9
Ta=25°C
Max. Unit
4.095
4.504
0.1
VDET
7
24
¾
V
V
V
mA
V
mA
¾ mV/°C
5 May 3, 2000
5 Page 
HT70XX
Holtek Semiconductor Inc. (Headquarters)
No.3 Creation Rd. II, Science-based Industrial Park, Hsinchu, Taiwan, R.O.C.
Tel: 886-3-563-1999
Fax: 886-3-563-1189
Holtek Semiconductor Inc. (Taipei Office)
5F, No.576, Sec.7 Chung Hsiao E. Rd., Taipei, Taiwan, R.O.C.
Tel: 886-2-2782-9635
Fax: 886-2-2782-9636
Fax: 886-2-2782-7128 (International sales hotline)
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
Copyright Ó 2000 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 pres-
ent 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.
11 May 3, 2000
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet HT7044A.PDF ] | |
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