Datasheet
Voltage Detector IC Series
Counter Timer Built-in
CMOS Voltage Detector IC
BU45Kxxxx, BU46Kxxxx, BU45Lxxxx, BU46Lxxxx series
●General
Description
ROHM’s BU45xxxxx and BU46xxxxx series are highly
accurate, low current consumption voltage detector IC
series. Because the counter timer delay circuit is built-in,
an external capacitor for the delay time setting is
unnecessary. Two output types are available (Nch open
drain and CMOS output) and detection voltages range
from 2.3V to 4.8V in increments of 0.1V with fixed delay
time of 200ms and 400ms, that may be selected
according to application.
●Features
Counter Timer Built-in
No delay time setting capacitor required
Low current consumption
Two output types (Nch open drain and CMOS output)
Package SSOP3 is similar to SOT-23-3 (JEDEC)
●Typical
Application Circuit
V
DD1
V
DD2
V
DD1
Key Specifications
Detection voltage:
2.3V to 4.8V (Typ.)
0.1V steps
High accuracy detection voltage:
±1.0%
Low current consumption:
2.3µA (Typ.)
Operating temperature range:
-40° to +105°
C
C
Two internal, fixed delay time:
200ms
400ms
●Package
SSOP3
2.92mm x 2.80mm x 1.25mm
●Applications
Circuits using microcontrollers or logic circuits that require
a reset
R
L
BU45 x x x xx
R
ST
Micro
controller
BD46 xx
x
xx
R
ST
Micro
controller
C
L
（
Noise-filtering
Capacitor
）
C
L
（
Noise-filtering
Capacitor
）
GND
GND
（Open
Drain Output Type）
BU45xxxxx series
●Connection
Diagram
SSOP3
（CMOS
Output Type）
BU46xxxxx series
●Pin
Descriptions
BU45KxxxG / BU46KxxxG
PIN No.
Symbol
GND
V
OUT
V
DD
GND
Function
V
DD
GND
3
3
1
2
3
Reset Output
Power Supply Voltage
TOP VIEW
BU45LxxxG / BU46LxxxG
1
GND
2
V
OUT
1
V
OUT
2
V
DD
PIN No.
1
2
3
Symbol
V
OUT
V
DD
GND
Function
Reset Output
Power Supply Voltage
GND
BU45Kxxx
xxxG
xxx
BU46Kxxx
xxxG
xxx
BU45Lxxx
xxxG
xxx
BU46Lxxx
xxxG
xxx
○Product
structure：Silicon monolithic integrated circuit
○This
product is not designed for protection against radioactive rays.
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TSZ22111½14½001
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TSZ02201-0R7R0G300130-1-2
03.July.2014 Rev.005
BU45Kxxxx, BU46Kxxxx, BU45Lxxxx, BU46Lxxxx series
●Ordering
Information
Datasheet
B
Part
Number
U
x
x
x
Package 1
x
x
x
x
-
T
L
Output Type
45 : Open Drain
46 : CMOS
Reset Voltage Value
23 : 2.3V
0.1V step
48 : 4.8V
Counter Timer
Package 2
Delay Time Settings
2 : 200ms
4 : 400ms
Packaging and
forming specification
TL : Embossed tape
and reel
Package 1
Package 2 Package name
K
G
SSOP3 (1pin GND)
L
G
SSOP3 (3pin GND)
●Lineup
Table 1. Open Drain Output Type
Counter Timer Delay Time Settings
1-Pin GND
200ms
Detection
Part
Marking
Voltage
Number
BU45K482
4.8V
bH
BU45K472
4.7V
bG
BU45K462
4.6V
bF
BU45K452
4.5V
bE
BU45K442
4.4V
bD
BU45K432
4.3V
bC
BU45K422
4.2V
bB
BU45K412
4.1V
bA
BU45K402
4.0V
aY
BU45K392
3.9V
aX
BU45K382
3.8V
aW
BU45K372
3.7V
aT
BU45K362
3.6V
aS
BU45K352
3.5V
aR
BU45K342
3.4V
aP
BU45K332
3.3V
aN
BU45K322
3.2V
aM
BU45K312
3.1V
aK
BU45K302
3.0V
aH
BU45K292
2.9V
aG
BU45K282
2.8V
aF
BU45K272
2.7V
aE
BU45K262
2.6V
aD
BU45K252
2.5V
aC
BU45K242
2.4V
aB
BU45K232
2.3V
aA
400ms
Marking
Part
Number
BU45K484
BU45K474
BU45K464
BU45K454
BU45K444
BU45K434
BU45K424
BU45K414
BU45K404
BU45K394
BU45K384
BU45K374
BU45K364
BU45K354
BU45K344
BU45K334
BU45K324
BU45K314
BU45K304
BU45K294
BU45K284
BU45K274
BU45K264
BU45K254
BU45K244
BU45K234
3-Pin GND
200ms
Marking
Part
Number
BU45L482
BU45L472
BU45L462
BU45L452
BU45L442
BU45L432
BU45L422
BU45L412
BU45L402
BU45L392
BU45L382
BU45L372
BU45L362
BU45L352
BU45L342
BU45L332
BU45L322
BU45L312
BU45L302
BU45L292
BU45L282
BU45L272
BU45L262
BU45L252
BU45L242
BU45L232
400ms
Marking
Part
Number
BU45L484
BU45L474
BU45L464
BU45L454
BU45L444
BU45L434
BU45L424
BU45L414
BU45L404
BU45L394
BU45L384
BU45L374
BU45L364
BU45L354
BU45L344
BU45L334
BU45L324
BU45L314
BU45L304
BU45L294
BU45L284
BU45L274
BU45L264
BU45L254
BU45L244
BU45L234
eF
eE
eD
eC
eB
eA
dY
dX
dW
dT
dS
dR
dP
dN
dM
dK
dH
dG
dF
dE
dD
dC
dB
dA
cY
cX
hD
hC
hB
hA
gY
gX
gW
gT
gS
gR
gP
gN
gM
gK
gH
gG
gF
gE
gD
gC
gB
gA
fY
fX
fW
fT
nB
nA
mY
mX
mW
mT
mS
mR
mP
mN
mM
mK
mH
mG
mF
mE
mD
mC
mB
mA
kY
kX
kW
kT
kS
kR
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TSZ22111½15½001
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TSZ02201-0R7R0G300130-1-2
03.July.2014 Rev.005
BU45Kxxxx, BU46Kxxxx, BU45Lxxxx, BU46Lxxxx series
Datasheet
●Lineup
- Continued
Table 2. CMOS Output Type
Counter Timer Delay Time Settings
1-Pin GND
200ms
Detection
Part
Marking
Voltage
Number
BU46K482
4.8V
cW
BU46K472
4.7V
cT
BU46K462
4.6V
cS
BU46K452
4.5V
cR
BU46K442
4.4V
cP
BU46K432
4.3V
cN
BU46K422
4.2V
cM
BU46K412
4.1V
cK
BU46K402
4.0V
cH
BU46K392
3.9V
cG
BU46K382
3.8V
cF
BU46K372
3.7V
cE
BU46K362
3.6V
cD
BU46K352
3.5V
cC
BU46K342
3.4V
cB
BU46K332
3.3V
cA
BU46K322
3.2V
bY
BU46K312
3.1V
bX
BU46K302
3.0V
bW
BU46K292
2.9V
bT
BU46K282
2.8V
bS
BU46K272
2.7V
bR
BU46K262
2.6V
bP
BU46K252
2.5V
bN
BU46K242
2.4V
bM
BU46K232
2.3V
bK
400ms
Marking
Part
Number
BU46K484
BU46K474
BU46K464
BU46K454
BU46K444
BU46K434
BU46K424
BU46K414
BU46K404
BU46K394
BU46K384
BU46K374
BU46K364
BU46K354
BU46K344
BU46K334
BU46K324
BU46K314
BU46K304
BU46K294
BU46K284
BU46K274
BU46K264
BU46K254
BU46K244
BU46K234
3-Pin GND
200ms
Marking
Part
Number
BU46L482
BU46L472
BU46L462
BU46L452
BU46L442
BU46L432
BU46L422
BU46L412
BU46L402
BU46L392
BU46L382
BU46L372
BU46L362
BU46L352
BU46L342
BU46L332
BU46L322
BU46L312
BU46L302
BU46L292
BU46L282
BU46L272
BU46L262
BU46L252
BU46L242
BU46L232
400ms
Marking
Part
Number
BU46L484
BU46L474
BU46L464
BU46L454
BU46L444
BU46L434
BU46L424
BU46L414
BU46L404
BU46L394
BU46L384
BU46L374
BU46L364
BU45L354
BU46L344
BU46L334
BU46L324
BU46L314
BU46L304
BU46L294
BU46L284
BU46L274
BU46L264
BU46L254
BU46L244
BU46L234
fS
fR
fP
fN
fM
fK
fH
fG
fF
fE
fD
fC
fB
fA
eY
eX
eW
eT
eS
eR
eP
eN
eM
eK
eH
eG
kP
kN
kM
kK
kH
kG
kF
kE
kD
kC
kB
kA
hY
hX
hW
hT
hS
hR
hP
hN
hM
hK
hH
hG
hF
hE
pM
pK
pH
pG
pF
pE
pD
pC
pB
pA
nY
nX
nW
nT
nS
nR
nP
nN
nM
nK
nH
nG
nF
nE
nD
nC
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TSZ22111½15½001
3/15
TSZ02201-0R7R0G300130-1-2
03.July.2014 Rev.005
BU45Kxxxx, BU46Kxxxx, BU45Lxxxx, BU46Lxxxx series
Datasheet
Absolute maximum ratings (Ta=25°
C)
Parameter
Power Supply Voltage
Nch Open Drain Output
Output Voltage
CMOS Output
Output Current
Power Dissipation
(Note1, Note2)
Operating Temperature
Ambient Storage Temperature
Symbol
V
DD-
G
ND
V
OUT
Io
Pd
Topr
Tstg
Limit
-0.3 to +6.0
GND-0.3 to +6.0
GND-0.3 to VDD+0.3
70
700
-40 to +105
-55 to +125
Unit
V
V
mA
mW
°
C
°
C
(Note 1) Use above Ta=25° results in a 7.0mW loss per degree.
C
(Note 2) When mounted on ROHM standard circuit board (70mmx70mmx1.6mm, glass epoxy board).
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.
●Electrical
characteristics (Unless Otherwise Specified Ta=-40 to 105°
C)
Parameter
Operating Voltage Range
Symbol
V
OPL
Condition
V
OL
≤0.4V,
R
L
=470k , Ta=25~105°
C
V
OL
≤0.4V,
R
L
=470k , Ta=-40~25°
C
V
DD
=H L, R
L
=470k
(Note 1)
Ta=25°
C
VDET=2.5V
Ta=-40° to 85°
C
C
Ta=85° to 105°
C
C
Ta=25°
C
VDET=3.0V
Ta=-40° to 85°
C
C
Ta=85° to 105°
C
C
Ta=25°
C
VDET=3.3V
Ta=-40° to 85°
C
C
Ta=85° to 105°
C
C
Ta=25°
C
VDET=4.2V
Ta=-40° to 85°
C
C
Ta=85° to 105°
C
C
Ta=25°
C
VDET=4.8V
Ta=-40° to 85°
C
C
Ta=85° to 105°
C
C
Detection Voltage
V
DET
Min.
0.6
0.9
V
DET
(T)
×0.99
2.475
2.418
2.404
2.970
2.901
2.885
3.267
3.191
3.173
4.158
4.061
4.039
4.752
4.641
4.616
-
Limit
Typ.
-
-
V
DET
(T)
2.5
-
-
3.0
-
-
3.3
-
-
4.2
-
-
4.8
-
-
±50
V
DET
(T)
×0.05
200
-
-
400
-
-
2.30
2.80
-
-
-
Max.
6.0
6.0
V
DET
(T)
×1.01
2.525
2.584
2.597
3.030
3.100
3.117
3.333
3.410
3.428
4.242
4.341
4.364
4.848
4.961
4.987
±360
V
DET
(T)
×0.08
280
460
235
560
920
470
7.00
8.00
-
0.3
0.3
1.0
Unit
V
V
Detection Voltage
Temperature coefficient
Hysteresis Voltage
V
DET
/∆T
-40°C~105°C
∆V
DET
V
DD
＝L
H L, R
L
=470k
ppm/°
C
V
‘High’ Output
Delay time
t
PLH
Circuit Current when ON
Circuit Current when OFF
‘High’ Output Voltage (Pch)
‘Low’Output Voltage (Nch)
Leak Current when OFF
I
DD
1
I
DD
2
V
OH
V
OL
Ileak
V
DET
(T)
×0.03
120
Ta=25°
C
C
L
=100pF,
95
C
C
BU4
XXXX
2G Ta=-40° to 85°
R
L
=100k
85
Ta=85° to 105°
C
C
( Note1,
240
Ta=25°
C
Note 2,
190
BU4
XXXX
4G Ta=-40° to 85°
C
C
Note 3 )
170
Ta=85° to 105°
C
C
0.60
V
DD
=V
DET
-0.2V, V
DET
=2.3V~4.8V
1.10
V
DD
=V
DET
+1.0V, V
DET
=2.3V~4.8V
V
DD
=5.0V, I
SOURCE
= 6.8mA, V
DET
(4.3V to 4.8V)
V
DD
=1.2V, I
SINK
= 2.0mA
V
DD
=2.4V, I
SINK
= 8.5mA, V
DET
(2.7V to 4.8V)
V
DD
=V
DS
=6.0V (Note 1)
ms
µA
µA
V
V
V
µA
VDD-0.5
-
-
-
V
DET
(T):Standard Detection Voltage (2.3V to 4.8V, 0.1V step)
R
L
:Pull-up resistor to be connected between V
OUT
and power supply.
C
L
:Capacitor to be connected between V
OUT
and GND.
(Note 1) Guarantee is Ta=25°C.
(Note 2) t
PLH
:V
DD
=(V
DET
(T)-0.5V) (V
DET
(T)+0.5V)
(Note 3) t
PLH
:V
DD
=Please set up the rise up time between V
DD
=V
OPL
V
DET
more than 10µs.
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TSZ22111½15½001
4/15
TSZ02201-0R7R0G300130-1-2
03.July.2014 Rev.005
BU45Kxxxx, BU46Kxxxx, BU45Lxxxx, BU46Lxxxx series
Datasheet
●Block
Diagrams
V
DD
Oscillator
V
OUT
Circuit Counter
Timer
Vref
GND
Fig.1 BU45xxxxx Series
V
DD
Oscillator
Circuit Counter
Timer
Vref
V
OUT
GND
Fig.2 BU46xxxxx Series
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TSZ02201-0R7R0G300130-1-2
03.July.2014 Rev.005
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