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Datasheet
Voltage Detector IC Series
Low Voltage Standard
CMOS Voltage Detector ICs
BU48xx series BU49xx series
General Description
ROHM standard CMOS reset IC series is a high-accuracy,
low current consumption reset IC series. The lineup was
established with two output types (Nch open drain and
CMOS output) and detection voltage range from 0.9V to
4.8V in increments of 0.1V, so that the series may be
selected according to the application at hand.
Features
Ultra-low current consumption
High accuracy detection, Ultra-low voltage detection
Two output types (Nch open drain and CMOS output)
Wide operating temperature range
Very small and low height package
Package SSOP5 and SOP4 is similar to SOT-23-5 and
SC-82 respectively (JEDEC)
Key Specifications
Detection voltage:
High accuracy detection voltage:
Ultra-low current consumption:
Operating temperature range:
0.9V to 4.8V
0.1V steps
±1.0%
0.55µA (Typ.)
-40°C to +125°C
Package
SSOP5
2.90mm x 2.80mm x 1.25mm
SOP4
2.00mm x 2.10mm x 0.95mm
VSOF5
1.60mm x 1.60mm x 0.60mm
Applications
All electronic devices that use micro controllers and logic
circuits
Typical Application Circuit
VDD1
VDD2
VDD1
RL
BU48xx
RST
Micro
controller
CIN
CL
(Capacitor for
noise filtering)
Open Drain Output type
BU48xx series
CIN
GND
GND
BU49xx
RST
Micro
controller
CL
(Capacitor for
noise filtering)
CMOS Output type
BU49xx series
Product structureSilicon monolithic integrated circuit
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© 2015 ROHM Co., Ltd. All rights reserved.
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BU48xx series BU49xx series
Connection Diagram & Pin Descriptions
SSOP5
TOP VIEW N.C.
N.C.
SOP4
TOP VIEW
GND
4
N.C.
3
Marking
Lot. No
VOUT VDD GND
PIN
No.
Symbol
Function
1 VOUT Reset output
2 VDD Power supply voltage
3 GND GND
4 N.C. Unconnected terminal
5 N.C. Unconnected terminal
VSOF5
TOP VIEW
GND VDD
54
Marking 1 2 3
VOUT SUB N.C
.
Lot. No
PIN
No.
Symbol
Function
1 VOUT Reset output
2 SUB Substrate*
3 N.C. Unconnected terminal
4 VDD Power supply voltage
5 GND GND
*Connect the substrate to VDD
Marking
Lot. No
1
VOUT
2
VDD
PIN
No.
Symbol
Function
1 VOUT Reset output
2 VDD Power supply voltage
3 N.C. Unconnected terminal
4 GND GND
Ordering Information
BU x x x x
x - TR
Part
Number
Output Type
48 : Open Drain
49 : CMOS
Reset Voltage Value
09 : 0.9V
0.1V step
48 : 4.8V
Package
G : SSOP5
F : SOP4
FVE : VSOF5
Packaging and
forming specification
TR : Embossed tape
and reel
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BU48xx series BU49xx series
Lineup
Output Type
Open Drain
Detection Voltage Marking Part Number
4.8V
JR BU4848
4.7V
JQ BU4847
4.6V
JP BU4846
4.5V
JN BU4845
4.4V
JM BU4844
4.3V
JL BU4843
4.2V
JK BU4842
4.1V
JJ BU4841
4.0V
JH BU4840
3.9V
JG BU4839
3.8V
JF BU4838
3.7V
JE BU4837
3.6V
JD BU4836
3.5V
JC BU4835
3.4V
JB BU4834
3.3V
JA BU4833
3.2V
HZ BU4832
3.1V
HY BU4831
3.0V
HX BU4830
2.9V
HW BU4829
2.8V
HV BU4828
2.7V
HU BU4827
2.6V
HT BU4826
2.5V
HS BU4825
2.4V
HR BU4824
2.3V
HQ BU4823
2.2V
HP BU4822
2.1V
HN BU4821
2.0V
HM BU4820
1.9V
HL BU4819
1.8V
HK BU4818
1.7V
HJ BU4817
1.6V
HH BU4816
1.5V
HG BU4815
1.4V
HF BU4814
1.3V
HE BU4813
1.2V
HD BU4812
1.1V
HC BU4811
1.0V
HB BU4810
0.9V
HA BU4809
Marking
LH
LG
LF
LE
LD
LC
LB
LA
KZ
KY
KX
KW
KV
KU
KT
KS
KR
KQ
KP
KN
KM
KL
KK
KJ
KH
KG
KF
KE
KD
KC
KB
KA
JZ
JY
JX
JW
JV
JU
JT
JS
CMOS
Part Number
BU4948
BU4947
BU4946
BU4945
BU4944
BU4943
BU4942
BU4941
BU4940
BU4939
BU4938
BU4937
BU4936
BU4935
BU4934
BU4933
BU4932
BU4931
BU4930
BU4929
BU4928
BU4927
BU4926
BU4925
BU4924
BU4923
BU4922
BU4921
BU4920
BU4919
BU4918
BU4917
BU4916
BU4915
BU4914
BU4913
BU4912
BU4911
BU4910
BU4909
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BU48xx series BU49xx series
Absolute Maximum Ratings
Parameter
Power Supply Voltage
Output Voltage
Nch Open Drain Output
CMOS Output
Output Current
Power
Dissipation
SSOP5
SOP4
VSOF5
*1*4
*2*4
*3*4
Symbol
VDD
VOUT
Io
Pd
Limits
-0.3 to +7
GND-0.3 to +7
GND-0.3 to VDD+0.3
70
540
400
210
Unit
V
V
mA
mW
Operation Temperature Range
Topt
-40 to +125
°C
Ambient Storage Temperature
Tstg
-55 to +125
*1 When used at temperatures higher than Ta=25, the power is reduced by 5.4mW per 1above 25.
*2 When used at temperatures higher than Ta=25, the power is reduced by 4.0mW per 1above 25.
*3 When used at temperatures higher than Ta=25, the power is reduced by 2.1mW per 1above 25.
*4 When a ROHM standard circuit board (70mm×70mm×1.6mm, glass epoxy board)is mounted.
Electrical Characteristics
Parameter
Symbol
Condition
VDD=HL , Ta=25,RL=470k
Detection Voltage
Detection Voltage
Temperature Coefficient
Hysteresis Voltage
VDET=1.8V
VDET=2.5V
Ta=+25°C
Ta=-40°C to 85°C
Ta=85°C to 125°C
Ta=+25°C
Ta=-40°C to 85°C
Ta=85°C to 125°C
VDET
VDET=3.0V
Ta=+25°C
Ta=-40°C to 85°C
Ta=85°C to 125°C
VDET=3.3V
Ta=+25°C
Ta=-40°C to 85°C
Ta=85°C to 125°C
VDET=4.2V
Ta=+25°C
Ta=-40°C to 85°C
Ta=85°C to 125°C
VDET/T Ta=-40to 125*1
VDET
VDD=LHL
Ta=-40to 125
RL=470k
VDET1.0V
VDET≥1.1V
*1 Guaranteed by design.(Outgoing inspection is not done on all products.)
VDET(T) : Standard Detection Voltage (0.9V to 4.8V, 0.1V step)
RL: Pull-up resistor to be connected between VOUT and power supply.
Min.
VDET(T)
×0.99
1.782
1.741
1.718
2.475
2.418
2.386
2.970
2.901
2.864
3.267
3.191
3.150
4.158
4.061
4.009
-
VDET
×0.03
VDET
×0.03
Limits
Typ.
VDET(T)
1.8
-
-
2.5
-
-
3.0
-
-
3.3
-
-
4.2
-
-
±30
VDET
×0.05
VDET
×0.05
Max.
VDET(T)
×1.01
1.818
1.860
1.883
2.525
2.584
2.615
3.030
3.100
3.139
3.333
3.410
3.452
4.242
4.341
4.394
Unit
V
- ppm/
VDET
×0.08
VDET
×0.07
V
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BU48xx series BU49xx series
Unless Otherwise Specified Ta=-25 to 125
Parameter
Symbol
Condition
VDET=0.9-1.3V
VDET=1.4-2.1V
Circuit Current when ON
IDD1 VDD=VDET-0.2V
VDET=2.2-2.7V
VDET=2.8-3.3V
VDET=3.4-4.2V
VDET=4.3-4.8V
VDET=0.9-1.3V
VDET=1.4-2.1V
Circuit Current when OFF
IDD2
VDD=VDET+2.0V
VDET=2.2-2.7V
VDET=2.8-3.3V
VDET=3.4-4.2V
VDET=4.3-4.8V
Operating Voltage Range
VOPL
VOL0.4V, Ta=25 to 125, RL=470k
VOL0.4V, Ta=-40 to 25, RL=470k
VDD=0.85V, ISINK = 20 µA
‘Low’ Output Voltage (Nch) VOL VDD=1.5V, ISINK = 1 mA, VDET=1.7-4.8V
VDD=2.4V, ISINK = 4 mA, VDET=2.7-4.8V
VDD=4.8V,ISOURCE=1.7mA,
‘High’ Output Voltage (Pch)
(only BU49xx)
VOH
VDET=0.9V to 3.9V
VDD=6.0V,ISOURCE=2.0mA,
VDET=4.0V to 4.8V
Output Leak Current when
OFF
(only BU48xx)
VDD=VDS=7V
Ta=-40to 85
Ileak VDD=VDS=7V
Ta=85to 125
* This product is not designed for protection against radioactive rays.
VDET(T) : Standard Detection Voltage (0.9V to 4.8V, 0.1V step)
RL: Pull-up resistor to be connected between VOUT and power supply.
Min.
-
-
-
-
-
-
-
-
-
-
-
-
0.70
0.90
-
-
-
VDD-0.5
VDD-0.5
-
-
Limit
Typ.
0.15
0.20
0.25
0.30
0.35
0.40
0.30
0.35
0.40
0.45
0.50
0.55
-
-
-
-
-
-
-
0
0
Max.
0.88
1.05
1.23
1.40
1.58
1.75
1.40
1.58
1.75
1.93
2.10
2.28
-
-
0.05
0.5
0.5
-
-
0.1
1
Unit
µA
µA
V
V
V
V
µA
Block Diagrams
VDD
Vref
GND
Fig.1 BU48xx Series
VOUT
VDD
Vref
GND
Fig.2 BU49xx Series
VOUT
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© 2015 ROHM Co., Ltd. All rights reserved.
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TSZ02201-0R7R0G300060-1-2
02.Nov.2015 Rev.012