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HT7022A Datasheet(PDF) 6 Page - Holtek Semiconductor Inc

Part # HT7022A
Description  Voltage Detector
PDF  16 Pages
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Manufacturer  HOLTEK [Holtek Semiconductor Inc]
Direct Link  http://www.holtek.com
Logo HOLTEK - Holtek Semiconductor Inc

HT7022A Datasheet(HTML) 6 Page - Holtek Semiconductor Inc

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HT7050A
Ta=25
°C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
VDD
Conditions
VDET
Hi
®Lo Detectable Voltage
¾¾
4.75
5
5.25
V
Lo
®Hi Detectable Voltage
¾¾
4.845
5.25
5.775
V
VHYS
Hysteresis Width
¾¾
0.02
VDET
0.05
VDET
0.1
VDET
V
IDD
Operating Current
8V
No load
¾
47
mA
VDD
Operating Voltage
¾¾
2.1
¾
24
V
IOL
Output Sink Current
3.6V
VOUT=0.36V
36
¾
mA
D
D
V
T
DET
a
Temperature Coefficient
¾
0
°C<Ta<70°C
¾±0.9
¾
mV/
°C
HT7070A
Ta=25
°C
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
VDD
Conditions
VDET
Hi
®Lo Detectable Voltage
¾¾
6.65
7
7.35
V
Lo
®Hi Detectable Voltage
¾¾
6.783
7.35
8.085
V
VHYS
Hysteresis Width
¾¾
0.02
VDET
0.05
VDET
0.1
VDET
V
IDD
Operating Current
8V
No load
¾
47
mA
VDD
Operating Voltage
¾¾
2.1
¾
24
V
IOL
Output Sink Current
5V
VOUT=0.5V
510
¾
mA
D
D
V
T
DET
a
Temperature Coefficient
¾
0
°C<Ta<70°C
¾±0.9
¾
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
¾ 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 (
-)=
RRR
RR
ABC
BC
++
+
´ VREF
The release voltage is defined as:
VDET (+) =
RR
R
AB
B
+
´ VREF



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