TECHNICAL DATA
BT75Axx
Voltage Detector
FUNCTIONS
BT75X X
OUT
V
SS
V
CC
OUT
1
2
3
V
SS
V
CC
SOT-23
TO-92
Detecting against error operations at the power ON/OFF
Resetting function for low voltage microprocessor
Checking low battery
Active Low
CMOS or open drain output (mask option)
Tolerance 2%
FEATURES
Low Power Consumption
Low Temperature Coefficient
Built-in Voltage Reference
Comparator Hysteresis
TO-92, SOT-23 packages are available
GENERAL DESCRIPTION
The BT75AXX series are the voltage detectors, consist of a high-precision voltage reference, a comparator with
precise thresholds and built-in hysteresis and an output driver.
ABSOLUTE MAXIMUM RATINGS (T
A
= 25
o
C)
Characteristic Symbol Value Unit
Supply Voltage
V
CC
-0.3 ~ +8.0
V
Operating Temperature
T
opr
-10 ~ +70
o
C
Storage Temperature
T
stg
-40 ~ +125
o
C
Output Current
I
O
30 mA
1
BT75Axx
ELECTRICAL CHARACTERISTICS
(T
A
= 25
o
C, unless otherwise specified)
Characteristic Symbol Test
Conditions
Min Typ
Max
Unit
Supply Voltage
V
CC
1.2
5.5
V
Detecting Voltage
V
DET
2.16
2.35
2.50
2.65
2.74
3.23
3.82
4.12
4.61
4.90
2.20
2.40
2.55
2.70
2.80
3.30
3.90
4.20
4.70
5.00
2.24
2.45
2.60
2.75
2.86
3.37
3.98
4.28
4.79
5.10
V
Supply Current
I
CC
V
CC
= 5.0V, No Load
8
15
A
Low Output Voltage
V
OL
V
CC
= V
DET
0.2V, I
OL
= 0.1mA
0.1
0.3
V
High Output Voltage
V
OH
V
CC
= V
DET
+0.2V, I
OH
= 0.1mA
V
CC
0.3V
V
Hysteresis Voltage
V
HYS
2.0
%
Detective Voltage Temperature
Coefficient
DET
DET
V
T
V
-10
o
C < T
A
<70
o
C
0.02
%/
o
C
BLOCK DIAGRAM
CMOS OUTPUT OPEN DRAIN OUTPUT
+
-
OUT
V
REF
R
A
R
B
V
B
R
C
V
SS
V
CC
+
-
OUT
V
SS
V
CC
V
REF
R
A
R
B
V
B
R
C
FUNCTIONAL DESCRIPTION
The BT75AXX series is the set of voltage detectors equipped with a high stability voltage reference which is
connected to the negative input of a comparator - denoted as V
REF
in block diagram.
When the voltage drop to the positive input of the comparator (V
B
) is high than V
REF
, V
OUT
goes high.
If V
CC
is decreased so that V
B
falls to a value less than V
REF
, the comparator output inverts from high to low, V
OUT
goes low.
The device has hysteresis to prevent the circuit from oscillation when V
B
V
REF
.
If V
CC
falls below the minimum operating voltage, the output becomes undefined.
The detectable voltage is defined as:
( )
REF
V
RC
RB
RC
RB
RA
DET
V
+
+
+
=
-
The release voltage is defined as:
( )
REF
V
RB
RB
RA
DET
V
+
=
+
The hysteresis width is:
)
(
DET
V
)
DET
HYS
V
(
V
-
-
=
+
2
BT75Axx
ELECTRICAL CHARACTERISTICS
1. OUTPUT VOLTAGE vs. SUPPLY VOLTAGE 2. OUTPUT LOW CURRENT vs. SUPPLY VOLTAGE
BT75A25 BT75A25
0
1
2
3
0
1
2
3
Supply Voltage: V (V)
CC
Ou
t
p
ut
V
ol
ta
g
e
:
V
(
V
)
OU
T
Ta=25 C
O
0
0.5
1.0
1.5
2.0
2.5
3.0
0
2
4
6
8
10
Supply Voltage: V (V)
CC
Ou
t
p
u
t
C
ur
r
e
n
t
: I
(
m
A
)
OUT
Ta=25 C
O
V
=0.5V
OUT
3. NORMALIZED V
OL
vs. TEMPERATURE NORMALIZED V
OH
vs. TEMPERATURE
-50
0
+50
+100
0.94
0.96
0.98
1
1.02
1.04
1.06
Temperature, T ( C)
A
O
O
ut
pu
t
V
ol
t
a
ge,
V
(
V
)
OH
V =3.5V, I =2.5mA
CC
OH
V =2.5V, I =1.5mA
CC
OH
V =5V, I =3.5mA
CC
OH
-50
0
+50
+100
0.6
0.8
1
1.2
1.4
1.6
Temperature, T ( C)
A
O
Ou
t
p
u
t
V
olt
a
ge
,
V
(
V
)
OL
4. V
OL
vs. OUTPUT CURRENT V
CC
- V
OH
vs. OUTPUT CURRENT
0
2
4
6
8
0
100
200
300
400
500
Output Current, I (mA)
OL
Ou
t
p
ut
V
ol
ta
g
e
,
V
(
V
)
OL
V =5V
CC
V =2.5V
CC
V =1.6V
CC
0
2
4
6
8
0
100
200
300
400
500
600
700
800
Output Current, I
(mA)
OH
V
-
V
(
V
)
CC
O
H
V =5V
CC
V =3.5V
CC
3
BT75Axx
5. V
OL
vs. SUPPLY VOLTAGE V
CC
- V
OH
vs. SUPPLY VOLTAGE
1.5
2.5
3.5
4.5
Supply Voltage, V (V)
CC
O
u
tp
u
t
V
o
lt
a
g
e
,
V
(
V
)
OL
0
100
200
300
400
500
I =1mA
OL
I =500 A
OL
I =2mA
OL
I =4mA
OL
1.5
2
2.5
3
4
3.5
4.5
5
0
100
200
300
400
500
I =1mA
OH
I =500 A
OH
I =2mA
OH
I =4mA
OH
Supply Voltage, V (V)
CC
V
-
V
(
V
)
CC
O
H
6. SUPPLY CURRENT vs. TEMPERATURE NORMALIZED THRESHOLD vs. TEMPERATURE
-50
0
+50
+100
0.98
0.985
0.99
0.995
1.000
1.005
1.010
1.015
1.02
Temperature, T ( C)
A
O
T
h
r
e
s
hol
d
{
1
}
-50
0
+50
+100
0
10
20
30
Temperature, T ( C)
A
O
Su
p
p
l
y
C
ur
r
e
nt
,
I
(
A
)
CC
m
V =5V
CC
V =2.0V
CC
ORDERING INFORMATION
BT75A XX XX - XX
PF = Pb Free
22 -> 2.20V
24 -> 2.40V
25 -> 2.55V
.
.
42 -> 4.20V
47 -> 4.70V
50 -> 5.00V
S = SOT-23
LS = TO-92 Straight (Bulk)
LF = TO-92 Form (Taping)
4
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