ROHM BU7251G, BU7251SG, BU7231G, BU7231SG, BU7252F Technical data

ROHM’s Selection Operational Amplifier/Comparator Series

Comparators:
Low Voltage CMOS

BU7251G,BU7251SG,BU7231G,BU7231SG,
BU7252F/FVM,BU7252S F/FVM,BU7232F/FVM,BU7232S F/FVM

●Description
CMOS comparator B U7 251/ B U 72 31f am i l y a nd BU7252/BU7232 family are input full swing and push pull o u tput compar a tor.
These ICs integrate one op-amp or two independent op-amps and phase compensation capacitor on a single chip.
The features of these ICs are low operating supplyVoltage that is +1.8V to +5.5V(single supply) and low supply current,
extremely low input bias current.

High speed

Single

Dual

Low power

Single

Dual

●Features

1) Low operating supply voltage (+1.8[V]～+5.5[V])

2) +1.8 [V]～+5.5[V](single supply)
±0.9[V]～±2.75[V](split supply)

3) Input and Output full swing

4) Push-pull output type

5) High speed operation (BU7251 family, BU7252 family)

6) Low supply current (BU7231 family, BU7232 family)

7) Internal ESD protection
Human body model (HBM) ±4000[V](Typ.)

8) Wide temperature range

-40[℃]～+85[℃] (BU7251G,BU7252 family, BU7231G, BU7232 family)

-40[℃]～+105[℃] (BU7251SG,BU7252S family, BU7231SG,BU7232S family)

● Pin Assignments

IN-

VSS

IN+

1

－

2

＋

3

VDD

5

OUT

4

BU 7251G
BU 7251SG
BU 7231G
BU 7231SG

BU7251 G

(BU7251SG:105

BU7252 F/FVM

(BU7252S F/FVM:105

BU7231 G

(BU7231SG:105℃)

BU7232 F/FVM

(BU7232S F/FVM:105 ℃ )

OUT1

IN1-

IN1+

VSS

SOP8SSOP5

BU 7252F
BU 7252SF
BU 7232F
BU 7232SF

℃)

1

CH1

2

- +

3

4

℃)

CH2

+ -

VDD

8

OUT2

7

IN2-

6

5

IN2+

MSOP8

BU 7252FVM
BU 7252SFVM
BU 7232FVM
BU 7232SFVM

No.09049EAT06

www.rohm.com

© 2009 ROHM Co., Ltd. All rights reserved.

1/18

2009.05 - Rev.A

BU7251G,BU7251SG, BU7231G,BU7231SG,
BU7252F/FVM,BU7252S F/FVM,BU7232F/FVM,BU7232S F/FVM

Technical Note

●Absolute maximum ratings (Ta=25[℃])

Rating

Parameter Symbol

Supply Voltage VDD-VSS +7 V
Differential Input Voltage

(*1)

Vid VDD-VSS V

BU7251G,BU7252 F/FVM
BU7231G,BU7232 F/FVM

BU7251SG,BU7252S F/FVM
BU7231SG,BU7232S F/FVM

Input Common-mode voltage range Vicm (VSS-0.3) to VDD+0.3 V
Operating Temperature Topr -40 to+85 -40 to+105 ℃
Storage Temperature Tstg -55 to+125 ℃
Maximum junction Temperature Tjmax +125 ℃

Note Absolute maximum rating item indicates the condition which must not be exceeded.
Application of voltage in excess of absolute maximum rating or use out ab soluted maximum rated temperature environment may cause deterioration of characteri stics.
(*1) The voltage difference between inverting input and non-inverting input is the differential input voltage.Then input terminal voltage is set to more then VEE.

●Electrical characteristics
○BU7251 family (Unless otherwise specified VDD=+3[V], VSS=0[V], Ta=25[℃])

Parameter Symbol

(*2)

(*2)(*4)
(*2)

Input Offset Voltage
Input Offset Current
Input Bias Current
Input Common-mode voltage Range
Large Signal Voltage Gain

Supply current
Power supply rejection ratio

Common-mode rejection ratio
Output source current
Output sink current
High Level Output Voltage
Low Level Output Voltage

(*4)

PSRR 25℃
CMRR 25℃

(*3)

(*3)

(*4)

(*4)

Output rise time
Output fall time
Propagation delay L to H
Propagation delay H to L

(*2) Abusolute values
(*3) Reference to power dissipation under the high temperature environment and decide the output current.
Continuous short circuit is occurring the degenerate of output current characteristics.
(*4) Full range BU7251：Ta=-40[℃] to +85[℃] BU7251S：Ta=-40[℃] to +105[℃]

TPLH 25℃
TPHL 25℃

T emperature

range

Vio 25℃

Iio 25℃

Ib 25℃

Vicm 25℃

AV 25℃

IDD

25℃

full range - - 50

IOH 25℃
IOL 25℃

VOH 25℃

VOL 25℃

Tr 25℃

Tf 25℃

Guaranteed Limit

BU7251G,BU7251SG

Unit Condition

Min. Typ. Max.

- 1 11

- 1 -

- 1 -

mV -

pA ­pA -

0 - 3

- 90 -

- 15 35

- 80 -

- 80 ­1 2 ­3 6 -

dB RL=10[kΩ]
μA RL=∞
dB -

dB ­mA VDD-0.4
mA VSS+0.4

VDD-0.1 - -

- - VSS+0.1

- 50 -

- 20 -

- 0.55 -

μs CL=15pF 100mV over drive

- 0.25 -

V (VDD-VSS)=3[V]

V RL=10[kΩ]

V RL=10[kΩ]
ns CL=15pF 100mV over drive
ns CL=15pF 100mV over drive

μs CL=15pF 100mV over drive

○BU7252 family (Unless otherwise specified VDD=+3[V], VSS=0[V], Ta=25[℃])

Guaranteed Limit

Parameter Symbol

(*2)

(*2)(*4)
(*2)

Input Offset Voltage
Input Offset Current
Input Bias Current
Input Common-mode voltage Range
Large Signal Voltage Gain

Supply current
Power supply rejection ratio

Common-mode rejection ratio
Output source current
Output sink current
High Level Output Voltage
Low Level Output Voltage

(*4)

PSRR 25℃
CMRR 25℃

(*3)

(*3)

(*4)

(*4)

Output rise time
Output fall time
Propagation delay L to H
Propagation delay H to L

(*2) Abusolute values
(*3) Reference to power dissipation under the high temperature environment and decide the output current.
Continuous short circuit is occurring the degenerate of output current characteristics.
(*4) Full range BU7251,BU7252：Ta=-40[℃] to +85[℃] BU7251S,BU7252S：Ta=-40[℃] to +105[℃]

TPLH 25℃
TPHL 25℃

T emperature

range

Vio 25℃

Iio 25℃

Ib 25℃

Vicm 25℃

AV 25℃

IDD

25℃

full range - - 80

IOH 25℃
IOL 25℃

VOH 25℃

VOL 25℃

Tr 25℃

Tf 25℃

BU7252 F/FVM

BU7252S F/FVM

Unit Condition

Min. Typ. Max.

- 1 11

- 1 -

- 1 -

mV -

pA ­pA -

0 - 3

- 90 -

- 35 65

- 80 -

- 80 ­1 2 ­3 6 -

dB RL=10[kΩ]
μA RL=∞
dB -

dB ­mA VDD-0.4
mA VSS+0.4

VDD-0.1 - -

- - VSS+0.1

- 50 -

- 20 -

- 0.55 -

μs CL=15pF 100mV over drive

- 0.25 -

V (VDD-VSS)=3[V]

V RL=10[kΩ]

V RL=10[kΩ]
ns CL=15pF 100mV over drive
ns CL=15pF 100mV over drive

μs CL=15pF 100mV over drive

Unit

2/18

BU7251G,BU7251SG, BU7231G,BU7231SG,
BU7252F/FVM,BU7252S F/FVM,BU7232F/FVM,BU7232S F/FVM

Technical Note

○BU7231 family (Unless otherwise specified VDD=+3[V], VSS=0[V], Ta=25[℃])

Guaranteed Limit

Parameter Symbol

T emperature

range

BU7231G,BU7231SG

Unit Condition

Min. Typ. Max.
Input Offset Voltage
Input Offset Current
Input Bias Current

(*5)

Vio 25℃ - 1 11 mV -

(*5)

Iio 25℃ - 1 - pA -

(*5)

Ib 25℃ - 1 - pA ­Input Common-mode voltage Range Vicm 25℃ 0 - 3 V (VDD-VSS)=3[V]
Large Signal Voltage Gain AV 25℃ - 90 - dB RL=10[kΩ]

Supply current IDD

25℃ - 5 15

full range - - 30

μA RL=∞

Power supply rejection ratio PSRR 25℃ - 80 - dB -
Common-mode rejection ratio CMRR 25℃ - 80 - dB -
Output source current
Output sink current
High Level Output Voltage
Low Level Output Voltage

(*6)

IOH 25℃ 1 2 - mA VDD-0.4

(*6)

IOL 25℃ 3 6 - mA VSS+0.4

(*7)

VOH 25℃ VDD-0.1 - - V RL=10[kΩ]

(*7)

VOL 25℃ - - VSS+0.1 V RL=10[kΩ]
Output rise time Tr 25℃ - 50 - ns CL=15pF 100mV over drive
Output fall time Tf 25℃ - 20 - ns CL=15pF 100mV over drive
Propagation delay L to H TPLH 25℃ - 1.7 - μs CL=15pF 100mV over drive
Propagation delay H to L TPHL 25℃ - 0.5 - mV CL=15pF 100mV over drive

(*5) Abusolute values
(*6) Reference to power dissipation under the high temperature environment and decide the output current.
Continuous short circuit is occurring the degenerate of output current characteristics.
(*7) Full range BU7231：Ta=-40[℃] to +85[℃] BU7231S,BU7232S：Ta=-40[℃] to +105[℃]

○BU7232 family (Unless otherwise specified VDD=+3[V], VSS=0[V], Ta=25[℃])

Guaranteed Limit

Parameter Symbol

T emperature

range

BU7232F/FVM

BU7232S F/FVM

Unit Condition

Min. Typ. Max.
Input Offset Voltage
Input Offset Current
Input Bias Current

(*5)

Vio 25℃ - 1 11 mV -

(*5)

Iio 25℃ - 1 - pA -

(*5)

Ib 25℃ - 1 - pA ­Input Common-mode voltage Range Vicm 25℃ 0 - 3 V (VDD-VSS)=3[V]
Large Signal Voltage Gain AV 25℃ - 90 - dB RL=10[kΩ]

Supply current IDD

25℃ - 10 25

full range - - 50

μA RL=∞

Power supply rejection ratio PSRR 25℃ - 80 - dB -
Common-mode rejection ratio CMRR 25℃ - 80 - dB -
Output source current
Output sink current
High Level Output Voltage
Low Level Output Voltage

(*6)

IOH 25℃ 1 2 - mA VDD-0.4

(*6)

IOL 25℃ 3 6 - mA VSS+0.4

(*7)

VOH 25℃ VDD-0.1 - - V RL=10[kΩ]

(*7)

VOL 25℃ - - VSS+0.1 V RL=10[kΩ]
Output rise time Tr 25℃ - 50 - ns CL=15pF 100mV over drive
Output fall time Tf 25℃ - 20 - ns CL=15pF 100mV over drive
Propagation delay L to H TPLH 25℃ - 1.7 - μs CL=15pF 100mV over drive
Propagation delay H to L TPHL 25℃ - 0.5 - mV CL=15pF 100mV over drive

(*5) Abusolute values
(*6) Reference to power dissipation under the high temperature environment and decide the output current.
Continuous short circuit is occurring the degenerate of output current characteristics.
(*7) Full range,BU7232：Ta=-40[℃] to +85[℃] BU7232S：Ta=-40[℃] to +105[℃]

3/18

BU7251G,BU7251SG, BU7231G,BU7231SG,

.

y

y

y

y

y

y

y

y

y

BU7252F/FVM,BU7252S F/FVM,BU7232F/FVM,BU7232S F/FVM

Technical Note

●Example of electrical characteristics
○BU7251 family

800

600

400

BU7251G

200

POWER DISSIPATION [mW] .

0

0 50 100 150

AMBIENT TEMPERATURE [℃]

Fig. 1 Fig. 2 Fig. 3

50

Derating Curve

BU7251 famil

BU7251 famil

800

600

BU7251SG

400

200

POWER DISSIPATION [mW]

0

050100150

AMBIENT TEMPERATURE [℃]

BU7251 famil

Derating Curve

6

BU7251 family

60

50

40

30

20

SUPPLY CURRENT [μA]

10

0

123456

85℃

SUPPLY VOLTAGE [V]

BU7251 family

105℃

25℃

-40℃

Supply Current – Supply Voltage

8

BU7251 famil

40

30

20

SUPPLY CURRENT [μA]

10

5.5V

1.8V

0

-60 -30 0 30 60 90 120
AMBIENT TEMPERATURE [℃]

Fig. 4 Fig. 5 Fig. 6

Supply Current – Ambient Temperature

50

3.0V

BU7251 famil

4

2

OUTPUT VOLTAGE HIGH [V]

0

123456

Output Voltage High – Supply Voltage

50

105℃

85℃

25℃

-40℃

SUPPLY VOLTAGE [V]

(RL=10[kΩ])

BU7251 famil

6

5.5V

4

2

OUTPUT VOLTAGE HIGH [V]

0

-60 -30 0 30 60 90 120

3.0V

1.8V

AMBIENT TEMPERATURE [℃]

Output Voltage High – Ambient Temperature

(RL=10[kΩ])

10

BU7251 famil

40

40

30

20

10

OUTPUT VOLTAGE LOW [mV]

0

123456

Fig. 7 Fig. 8 Fig. 9

Output Voltage Low – Supply Voltage

5

4

105℃

85℃

-40℃

SUPPLY VOLTAGE [V]

(RL=10[kΩ])

25℃

BU7251 famil

3

5.5V

2

1

OUTPUT SOURCE CU RRENT [mA]

0

-60 -30 0 30 60 90 120
AMBIENT TEMPERATURE [℃]

3.0V

1.8V

Fig. 10 Fig. 11 Fig. 12

Output Source Current – Ambient Temperature

(*) The above date is ability value of sample, it is not guaranteed. BU7251G：-40[℃] to+85[℃] BU7251SG：-40[℃] to+105[℃]

(VOUT=VDD-0.4[V])

30

20

10

OUTPUT VOLTAGE LOW [mV]

0

-60 -30 0 30 60 90 120

5.5V

1.8V

3.0V

AMBIENT TEMPERATURE [℃]

Output Voltage Low – Ambient

-40℃

(RL=10[kΩ])

BU7251 famil

25℃

85℃

105℃

Temperature

30

25

20

15

10

5

OUTPUT SINK CURRENT [mA]

0

0.0 0.5 1.0 1.5 2.0 2.5 3.0
OUTPUT VOLTAGE [V]

Output Sink Current – Output Voltage

(VDD=3[V])

8

-40℃

6

4

2

OUTPUT SOURCE CURRENT [mA]

0

85℃

105℃

0.0 0.5 1.0 1.5 2.0 2.5 3.0
OUTPUT VOLTAGE [V]

25℃

Output Source Current – Supply

(VDD=3[V])

Voltage

20

15

10

5

OUTPUT SINK CURRENT [ mA]

0

-60-300306090120

3.0V

1.8V

AMBIENT TEMPERATURE [℃]

BU7251 family

5.5V

Output Sink Current – Ambient Temperature

(VOUT=VSS+0.4[V])

4/18

BU7251G,BU7251SG, BU7231G,BU7231SG,

y

y

y

y

y

BU7252F/FVM,BU7252S F/FVM,BU7232F/FVM,BU7232S F/FVM

Technical Note

○BU7251 family

10.0

7.5

5.0

2.5

0.0

-2.5

-5.0

INPUT OFFSET VOLTAGE [mV]

-7.5

-10.0
123456

Fig. 13 Fig. 14 Fig. 15

Input Offset Voltage – Supply Voltage

(Vicm=VDD, Vout=0.1[V])

160

85℃

25℃

SUPPLY VOLTAGE [V]

105℃

-40℃

BU7251 family

BU7251 famil

10.0

7.5

5.0

2.5

INPUT OFFSET VOLTAGE [mV]

0.0

-2.5

-5.0

-7.5

-10.0

5.5V

-60 -30 0 30 60 90 120
AMBIENT TEMPERATURE [℃]

BU7251 famil

3.0V

1.8V

Input Offset Voltage – Ambient Temperature

(Vicm=VDD, Vout=0.1[V])

160

BU7251 family

15

10

5

0

-5

-10

INPUT OFFSET VOLTAGE [mV]

-15

-1 0 1 2 3 4
INPUT VOLTAGE [V]

85℃

-40℃

105℃

25℃

Input offset voltage – Input Voltage

(VDD=3[V])

120

BU7251 famil

BU7251 family

140

140

120

105℃

100

80

LARGE SIGNAL VOLTAGE GAIN [dB]

60

Fig. 16 Fig. 17 Fig. 18

Large Signal Voltage Gain – Supply Voltage

-40℃

123456

SUPPLY VOLTAGE [V]

85℃

25℃

120

BU7251 family

120

100

80

LARGE SIGNAL VOLTAGE GAIN [dB]

60

-60 -30 0 30 60 90 120

1.8V

3.0V

5.5V

AMBIENT TEMPERATURE [℃]

Large Signal Voltage Gain

– Ambient Temperature

120

BU7251 famil

100

80

60

40

20

COMMON MODE REJECT ION RATIO [dB]

0

123456

85℃

105℃

SUPPLY VOLTAGE [V]

25℃

-40℃

Common Mode rejection Ratio

– Supply Voltage

2.0

(VDD=3[V])

BU7251 family

100

80

60

40

20

COMMON MODE REJECT ION RATIO [dB]

0

-60 -30 0 30 60 90 120

Fig. 19 Fig. 20 Fig. 21

Common Mode Rejection Ratio –

0.8

5.5V

1.8V

AMBIENT TEMPERATURE [

3.0V

Ambient Temperature

(VDD=3[V])

BU7251 famil

]

℃

100

80

60

40

20

POWER SUPPLY REJECT ION RATIO [dB]

0

-60 -30 0 30 60 90 120
AMBIENT TEMPERATURE [

Power Supply Rejection –

Ambient Temperature

1.5

1.0

0.5

PROPAGATION DELAY L-H [μs]

0.0

]

℃

1.8V

5.5V

3.0V

-60 -30 0 30 60 90 120
AMBIENT TEMPERATURE [

]

℃

Propagation Delay L-H –

Ambient Temperature

0.6

0.4

1.8V

5.5V

0.2

PROPAGATION DELAY H-L [μs]

0.0

-60 -30 0 30 60 90 120

Fig. 22

Propagation Delay H-L – Ambient Temperature

(*) The above date is ability value of sample, it is not guaranteed. BU7251G：-40[℃] to+85[℃] BU7251SG：-40[℃] to+105[℃]

3.0V

AMBIENT TEMPERATURE [℃]

5/18

BU7251G,BU7251SG, BU7231G,BU7231SG,

y

y

y

y

y

y

y

BU7252F/FVM,BU7252S F/FVM,BU7232F/FVM,BU7232S F/FVM

Technical Note

○BU7252 family

1000

800

600

400

POWER DISSIPATION [mV]

200

0

0 50 100 150

AMBIENT TEMPERATURE [℃] .

Fig. 23 Fig. 24 Fig. 25

150

BU7252F

Derating Curve

85

BU7252 famil

BU7252FVM

BU7252 family

1000

800

600

400

PO WER DIS SIPATION [ mV]

200

0

0 50 100 150

AMBIENT TEMPERATURE [℃] .

BU7252SF

Derating Curve

8

BU7252 family

BU7252SFVM

105

BU7252 family

150

100

50

SUPPLY CURRENT [μA]

0

-40℃

123456

SUPPLY VOLTAGE [V]

Supply Current – Supply Voltage

8

100

50

SUPPLY CURRENT [μA]

1.8V

3.0V

0

-60 -30 0 30 60 90 120
AMBIENT T E MPERATURE [

Fig. 26 Fig. 27 Fig. 28

Supply Curreny – Ambient Temperature

50

5.5V

℃

BU7252 famil

]

6

4

2

OUTPUT VOLTAGE HIGH [V]

0

123456

105℃

85℃

25℃

-40℃

SUPPLY VOLTAGE [V]

Output Voltage High – Supply Voltage

(RL=10[kΩ])

50

BU7252 famil

6

4

2

OUTPUT VOLTAGE HIGH [V]

0

-60 -30 0 30 60 90 120
AMBIENT TEMPERATURE [℃]

Output Voltage High – Ambient Temperature

10

40

30

20

10

OUTPUT VOLTAGE LOW [mV]

0

Fig. 29 Fig. 30 Fig. 31

5

4

3

2

1

OU T PUT SOUR CE C URRENT [mA ]

0

-60-30 0 30 60 90120

Output Source Current – Ambient Temperature

-40℃

123456

SUPPLY VOLTAG E [V]

Output Voltage Low – Supply

Voltage

3.0V

1.8V

AMBIENT TEMPERATURE [℃]

Fig. 32 Fig. 33 Fig. 34

(VOUT=VDD-0.4[V])

85℃

25℃

(RL=10[kΩ])

5.5V

105℃

BU7252 famil

40

30

20

10

OUTPUT VOLTAGE LOW [mV]

0

-60 -30 0 30 60 90 120
AMBIENT TEMPERATURE [℃]

5.5V

3.0V

1.8V

Output Voltage Low – Ambient

-40℃

(RL=10[kΩ])

BU7252 famil

85℃

105℃

Temperature

30

25

20

15

10

OUT PU T S INK CURR E NT [mA ]

25℃

5

0

0.0 0.5 1.0 1.5 2.0 2.5 3.0
OUTPUT VOLTAGE [V]

Output Sink Current – Output Voltage

(VDD=3[V])

(*) The above date is ability value of sample, it is not guaranteed. BU7252 F/FVM：-40[℃] to+85[℃] BU7252S F/FVM：-40[℃] to+105[℃]

8

-40℃

6

4

105℃

2

OUTPUT SOURCE CURRENT [mA]

0

0 0.5 1 1.5 2 2.5 3

OUTPUT VOLTAGE [V]

Output Source Current – Output

Voltage

20

15

10

1.8V

5

OUTPUT SINK CURRENT [ mA]

0

-60-300306090120
AMBIENT TEMPERATURE [℃]

Output Sink Current – Ambient Temperature

(VOUT=VSS+0.4[V])

BU7252 famil

105℃

85℃

25℃

BU7252 family

5.5V

3.0V

1.8V

(RL=10[kΩ])

BU7252 family

25℃

85℃

(VDD=3[V])

BU7252 famil

5.5V

3.0V

6/18