Datasheet
Comparator
Input Full Swing Push-pull Output
High Speed CMOS Comparators
BU7251G
BU7251SG BU7252xxx
BU7252Sxxx
Key Specifications
Operating Supply Voltage
+1.8V to +5.5V
(Single Supply):
(Split Supply):
j
±0.9V to ±2.75V
Supply Current (VDD=3V, T
A
=25°C):
BU7251G, BU7251SG
15μA
35μA
BU7252xxx, BU7252Sxxx
Input Bias Current (T
A
=25°C):
1pA
Operating Temperature Range:
BU7251G, BU7252xxx
-40°C to 85°C
-40°C to 105°C
BU7251SG, BU7252Sxxx
Package
SSOP5
SOP8
MSOP8
W(Typ) xD(Typ) xH(Max)
2.90mm x 2.80mm x 1.25mm
5.00mm x 6.20mm x 1.71mm
2.90mm x 4.00mm x 0.90mm
General Description
BU7251G/BU7252xxx are input full swing and push pull
output comparators. BU7251SG/BU7252Sxxx have an
expanded operating temperature range. These features
low operating supply voltage of +1.8V to +5.5V(single
supply) with low supply current and extremely low input
bias current.
Features
Low Operating Supply Voltage
Low supply current
Input Full Swing
Push-pull Output
Wide Operating Temperature Range
Applications
Battery Monitor
Limit Comparator
Mobile Equipments
Current Detection Circuit
Consumer Electronics
Pin Configuration
BU7251G, BU7251SG: SSOP5
Pin No.
1
2
3
4
OUT
IN-
VSS
1
2
-
+
5
VDD
Pin Name
IN-
VSS
IN+
OUT
VDD
IN+ 3
4
5
BU7252F, BU7252SF: SOP8
BU7252FVM, BU7252SFVM: MSOP8
Pin No.
OUT1 1
IN1- 2
IN1+ 3
VSS 4
CH1
- +
+
CH2
+ -
8 VDD
7 OUT2
6 IN2-
5 IN2+
Pin Name
OUT1
IN1-
IN1+
VSS
IN2+
IN2-
OUT2
VDD
1
2
3
4
5
6
7
8
○Product
structure：Silicon monolithic integrated circuit
○This
product is not designed protection against radioactive rays.
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BU7251G
BU7251SG
BU7252xxx
BU7252Sxxx
Datasheet
Package
SSOP5
BU7251G
BU7251SG
Ordering Information
SOP8
BU7252F
BU7252SF
MSOP8
BU7252FVM
BU7252SFVM
B
U
7
2
5
x
x
x
-
x
x
Part Number
BU7251G
BU7251SG
BU7252xxx
BU7252Sxxx
Line-up
T
opr
Channels
1ch
-40°C to +85°C
2ch
1ch
-40°C to +105°C
2ch
Package
G
: SSOP5
F
: SOP8
FVM : MSOP8
Packaging and Forming Specification
TR: Embossed Tape and Reel
(SSOP5/MSOP8)
E2: Embossed tape and reel
(SOP8)
Package
SSOP5
SOP8
MSOP8
SSOP5
SOP8
MSOP8
Reel of 3000
Reel of 2500
Reel of 3000
Reel of 3000
Reel of 2500
Reel of 3000
Orderable Part Number
BU7251G-TR
BU7252F-E2
BU7252FVM-TR
BU7251SG-TR
BU7252SF-E2
BU7252SFVM-TR
Absolute Maximum Ratings
(T
A
=25°C)
Parameter
Supply Voltage
Power Dissipation
Symbol
VDD-VSS
SSOP5
P
D
SOP8
MSOP8
Differential Input
Voltage
(Note 5)
Input Common-mode
Voltage Range
Input Current
(Note 6)
Operating Supply
Voltage
Operating
Temperature
Storage Temperature
Maximum Junction
Temperature
(Note 1)
(Note 2)
(Note 3)
(Note 4)
(Note 5)
Rating
BU7251G
0.54
(Note 1,4)
-
-
BU7252xxx
+7
-
0.55
(Note 2,4)
0.47
(Note 3,4)
VDD - VSS
(VSS - 0.3) to (VDD + 0.3)
±10
+1.8 to +5.5
±0.9 to ±2.75
-40 to +85
-55 to +125
+125
-40 to +105
0.54
(Note 1,3)
-
-
-
0.55
(Note 2,4)
0.47
(Note 3,4)
BU7251SG
BU7252Sxxx
Unit
V
W
V
ID
V
ICM
I
I
V
opr
T
opr
T
stg
T
Jmax
V
V
mA
V
°C
°C
°C
To use at temperature above T
A
=25C reduce 5.4mW/C.
To use at temperature above T
A
=25C reduce 5.5mW/C.
To use at temperature above T
A
=25C reduce 4.7mW/C.
Mounted on a FR4 glass epoxy PCB 70mm×70mm×1.6mm (Copper foil area less than 3%).
The voltage difference between inverting input and non-inverting input is the differential input voltage.
Then input pin voltage is set to more than VSS.
(Note 6) An excessive input current will flow when input voltages of more than VDD+0.6V or less than VSS-0.6V are applied.
The input current can be set to less than the rated current by adding a limiting resistor.
Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open
circuit between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case
the IC is operated over the absolute maximum ratings.
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BU7251G
BU7251SG
BU7252xxx
BU7252Sxxx
Datasheet
Electrical Characteristics
○BU7251G,
BU7251SG (Unless otherwise specified VDD=+3V, VSS=0V, T
A
=25°C)
Parameter
Input Offset Voltage
(Note 7)
Input Offset Current
(Note 7)
Input Bias Current
(Note 7)
Supply Current
(Note 8)
Maximum Output Voltage (High)
Maximum Output Voltage (Low)
Large Single Voltage Gain
Input Common-mode Voltage
Range
Common-mode Rejection Ratio
Power Supply Rejection Ratio
Output Source Current
(Note 9)
Output Sink Current
(Note 9)
Output Rise Time
Output Fall Time
Rising Propagation Delay
Falling Propagation Delay
Symbol
V
IO
I
IO
I
B
I
DD
V
OH
V
OL
A
V
V
ICM
CMRR
PSRR
I
SOURCE
I
SINK
t
R
t
F
t
PLH
t
PHL
Temperature
Range
25°C
25°C
25°C
25°C
Full Range
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
Limit
Min
-
-
-
-
-
VDD-0.1
-
-
0
-
-
1
3
-
-
-
-
Typ
1
1
1
15
-
-
-
90
-
80
80
2
6
50
20
0.55
0.25
Max
11
-
-
35
50
-
VSS+0.1
-
3
-
-
-
-
-
-
-
-
Unit
mV
pA
pA
μA
V
V
dB
V
dB
dB
mA
mA
ns
ns
μs
mV
R
L
=∞
R
L
=10kΩ to VDD/2
R
L
=10kΩ to VDD/2
R
L
=10kΩ to VDD/2
VSS to VDD
-
-
OUT=VDD-0.4V
OUT=VSS+0.4V
C
L
=15pF
100mV Overdrive
C
L
=15pF
100mV Overdrive
C
L
=15pF
100mV Overdrive
C
L
=15pF
100mV Overdrive
Condition
-
-
-
(Note 7) Absolute value.
(Note 8) Full range: BU7251G: T
A
=-40°C to +85°C BU7251SG: T
A
=-40°C to +105°C.
(Note 9) Under the high temperature environment, consider the power dissipation of IC when selecting the output current.
When the terminal short circuits are continuously output, the output current is reduced to climb to the temperature inside IC.
:
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BU7251G
BU7251SG
BU7252xxx
BU7252Sxxx
Datasheet
Electrical Characteristics - continued
○BU7252xxx,
BU7252Sxxx (Unless otherwise specified VDD=+3V, VSS=0V, T
A
=25°C)
Parameter
Input Offset Voltage
(Note 10)
Input Offset Current
(Note 10)
Input Bias Current
(Note 10)
Supply Current
(Note 11)
Maximum Output Voltage (High)
Maximum Output Voltage (Low)
Large Single Voltage Gain
Input Common-mode Voltage
Range
Common-mode Rejection Ratio
Power Supply Rejection Ratio
Output Source Current
(Note 12)
Output Sink Current
(Note 12)
Output Rise Time
Output Fall Time
Propagation Delay L to H
Propagation Delay H to L
Symbol
V
IO
I
IO
I
B
I
DD
V
OH
V
OL
A
V
V
ICM
CMRR
PSRR
I
SOURCE
I
SINK
t
R
t
F
t
PLH
t
PHL
Temperature
Range
25°C
25°C
25°C
25°C
Full Range
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
25°C
Limit
Min
-
-
-
-
-
VDD-0.1
-
-
0
-
-
1
3
-
-
-
-
Typ
1
1
1
35
-
-
-
90
-
80
80
2
6
50
20
0.55
0.25
Max
11
-
-
65
80
-
VSS+0.1
-
3
-
-
-
-
-
-
-
-
Unit
mV
pA
pA
μA
V
V
dB
V
dB
dB
mA
mA
ns
ns
μs
mV
Condition
-
-
-
R
L
=∞, All Comparators
R
L
=10kΩ to VDD/2
R
L
=10kΩ to VDD/2
R
L
=10kΩ to VDD/2
VSS to VDD
-
-
OUT=VDD-0.4V
OUT=VSS+0.4V
C
L
=15pF
100mV over drive
C
L
=15pF
100mV over drive
C
L
=15pF
100mV over drive
C
L
=15pF
100mV over drive
(Note 10) Absolute value.
(Note 11) Full range: BU7252xxx: T
A
=-40°C to +85°C BU7252Sxxx: T
A
=-40°C to +105°C.
(Note 12) Under the high temperature environment, consider the power dissipation of IC when selecting the output current.
When the terminal short circuits are continuously output, the output current is reduced to climb to the temperature inside IC.
:
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BU7251G
BU7251SG
BU7252xxx
BU7252Sxxx
Datasheet
Description of Electrical Characteristics
Described below are descriptions of the relevant electrical terms used in this datasheet. Items and symbols used are also
shown. Note that item name and symbol and their meaning may differ from those on another manufacturer’s document or
general document.
1. Absolute Maximum Ratings
Absolute maximum rating items indicate the condition which must not be exceeded. Application of voltage in excess of absolute
maximum rating or use out of absolute maximum rated temperature environment may cause deterioration of characteristics.
(1) Supply Voltage (VDD/VSS)
Indicates the maximum voltage that can be applied between the VDD terminal and VSS terminal without
deterioration or destruction of characteristics of internal circuit.
(2) Differential Input Voltage (V
ID
)
Indicates the maximum voltage that can be applied between non-inverting and inverting terminals without damaging
the IC.
(3) Input Common-mode Voltage Range (V
ICM
)
Indicates the maximum voltage that can be applied to the non-inverting and inverting terminals without deterioration
or destruction of electrical characteristics. Input common-mode voltage range of the maximum ratings does not assure
normal operation of IC. For normal operation, use the IC within the input common-mode voltage range characteristics.
(4) Power Dissipation (P
D
)
Indicates the power that can be consumed by the IC when mounted on a specific board at the ambient temperature 25°C
(normal temperature). As for package product, P
D
is determined by the temperature that can be permitted by the IC in
the package (maximum junction temperature) and the thermal resistance of the package.
2. Electrical Characteristics
(1) Input Offset Voltage (V
IO
)
Indicates the voltage difference between non-inverting terminal and inverting terminals. It can be translated into the
input voltage difference required for setting the output voltage at 0 V.
(2) Input Offset Current (I
IO
)
Indicates the difference of input bias current between the non-inverting and inverting terminals.
(3) Input Bias Current (I
B
)
Indicates the current that flows into or out of the input terminal. It is defined by the average of input bias currents at
the non-inverting and inverting terminals.
(4) Supply Current (I
DD
)
Indicates the current that flows within the IC under specified no-load conditions.
(5) Maximum Output Voltage(High) / Maximum Output Voltage(Low) (V
OH
/V
OL
)
Indicates the voltage range of the output under specified load condition. It is typically divided into maximum output
voltage high and low. Maximum output voltage high indicates the upper limit of output voltage. Maximum output
voltage low indicates the lower limit.
(6) Large Signal Voltage Gain (A
V
)
Indicates the amplifying rate (gain) of output voltage against the voltage difference between non-inverting terminal
and inverting terminal. It is normally the amplifying rate (gain) with reference to DC voltage.
A
V
= (Output voltage) / (Differential Input voltage)
(7) Input Common-mode Voltage Range (V
ICM
)
Indicates the input voltage range where IC normally operates.
(8) Common-mode Rejection Ratio (CMRR)
Indicates the ratio of fluctuation of input offset voltage when the input common mode voltage is changed. It is
normally the fluctuation of DC.
CMRR = (Change of Input common-mode voltage)/(Input offset fluctuation)
(9) Power Supply Rejection Ratio (PSRR)
Indicates the ratio of fluctuation of input offset voltage when supply voltage is changed.
It is normally the fluctuation of DC.
PSRR = (Change of power supply voltage)/(Input offset fluctuation)
(10) Output Source Current/Output Sink Current (I
SOURCE
/ I
SINK
)
The maximum current that can be output from the IC under specific output conditions. The output source current
indicates the current flowing out from the IC, and the output sink current indicates the current flowing into the IC.
(11) Output Rise Time/Output Fall Time (t
R
/ t
F
)
Indicates the time required for an output voltage step to change from 10% to 90% of its final value.
(12) Rising Propagation Delay Time/Falling Propagation Delay Time (t
PLH
/ t
PHL
)
Indicates the time to reach 50% of the output voltage after the step voltage is applied at the input pin.
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