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參數資料
| 型號： | HT7044A |
| 廠商： | Holtek Semiconductor Inc. |
| 英文描述： | Voltage Detector |
| 中文描述： | 電壓檢測器 |
| 文件頁數： | 6/16頁 |
| 文件大小： | 162K |
| 代理商： | HT7044A |
HT7050A
Ta=25 C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
DD
Conditions
V
DET
Hi
Lo Detectable Voltage
4.75
5
5.25
V
Lo
Hi Detectable Voltage
4.845
5.25
5.775
V
V
HYS
Hysteresis Width
0.02
V
DET
0.05
V
DET
0.1
V
DET
V
I
DD
Operating Current
8V
No load
4
7
A
V
DD
Operating Voltage
2.1
24
V
I
OL
Output Sink Current
3.6V
V
OUT
=0.36V
3
6
mA
V
T
DET
a
Temperature Coefficient
0 C<Ta<70 C
0.9
mV/ C
HT7070A
Ta=25 C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
DD
Conditions
V
DET
Hi
Lo Detectable Voltage
6.65
7
7.35
V
Lo
Hi Detectable Voltage
6.783
7.35
8.085
V
V
HYS
Hysteresis Width
0.02
V
DET
0.05
V
DET
0.1
V
DET
V
I
DD
Operating Current
8V
No load
4
7
A
V
DD
Operating Voltage
2.1
24
V
I
OL
Output Sink Current
5V
V
OUT
=0.5V
5
10
mA
V
T
DET
a
Temperature Coefficient
0 C<Ta<70 C
0.9
mV/ C
HT70XX
Rev. 1.60
6
January 14, 2003
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 comparator
noted as V
REF
in the following figure for NMOS output
voltage detector.
de-
When the voltage drop to the positive input of the com-
parator (i,e,V
B
) is higher than V
REF
, VOUT goes high,
M1 turns off, and V
B
is expressed as V
BH
=V
DD
(R
B
+R
C
) / (R
A
+R
B
+R
C
). If V
DD
is decreased so that V
B
falls to a value less than V
REF
, the comparator output in-
verts from high to low, V
OUT
goes low, V
C
is high, M1
turns on, RC is bypassed, and V
B
becomes:
V
BL
=V
DD
R
B
/ (R
A
+R
B
), which is less than V
BH.
By so
doing, the comparator output will stay low to prevent the
circuit from oscillating when V
B
V
REF.
If V
DD
falls below the minimum operating voltage, the
outputbecomesundefined.WhenVDDgoesfromlowto
V
DD
V
OUT
goes high.
R
B
/ (R
A
+R
B
) > V
REF
, the comparator output and
The detectable voltage is defined as:
V
DET
( ) =R
R
R
R
R
A
B
C
B
C
V
REF
The release voltage is defined as:
V
DET
(+) =R
R
R
A
B
B
V
REF
相關PDF資料 |
PDF描述 |
|---|---|
| HT7050A | Voltage Detector |
| HT7070A | Voltage Detector |
| HT70XX | Voltage Detector |
| HT71XX-1 | 30mA Voltage Regulator |
| HT71XX | High Voltage Regulator |
相關代理商/技術參數 |
參數描述 |
|---|---|
| HT7044A(SOT89) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage Detector |
| HT7044A(TO92) | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage Detector |
| HT7044A-1 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:TinyPower Voltage Detector |
| HT7044A-2 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:TinyPowerTM Voltage Detector |
| HT7044A-3 | 制造商:HOLTEK 制造商全稱:Holtek Semiconductor Inc 功能描述:TinyPowerTM Voltage Detector |
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