TECHNICAL NOTE
Voltage Detector IC Series
Standard CMOS
Voltage Detector IC
BD48□□G/FVE，BD49□□G/FVE Series
●General
Description
ROHM’s BD48□□G/FVE and BD49□□G/FVE series are highly accurate, low current consumption reset IC series. The lineup was
established with tow output types (Nch open drain and CMOS output) and detection voltages range from 2.3V to 6.0V in increments of 0.1V,
so that the series may be selected according the application at hand.
●Features
1）
2）
3）
4）
5）
Detection voltage: 2.3V to 6.0V (Typ.), 0.1V steps
High accuracy detection voltage: ±1.0%
Ultra-low current consumption: 0.8µA (Typ.)
Nch open drain output (BD48□□G/FVE), CMOS output (BD49□□G/FVE)
Compact packages VSOF5: BD48□□FVE, BD49□□FVE
SSOP5: BD48□□G, BD49□□G
●Applications
All electronic devices that use microcontrollers and logic circuits
●Selection
Guide
Number
Specifications
Output Circuit
Format
Detection
Voltage
Package
Detection
Voltage
6.0V
5.9V
5.8V
5.7V
5.6V
5.5V
5.4V
5.3V
5.2V
5.1V
5.0V
4.9V
4.8V
4.7V
4.6V
4.5V
4.4V
4.3V
4.2V
Description
8：Open Drain Output
9：CMOS Output
Example: Displays VS over a 2.3V to 6.0V
range in 0.1V increments.
(2.9V is marked as “29”)
G：SSOP5 / FVE: VSOF5
Part
Number
BD4960
BD4959
BD4958
BD4957
BD4956
BD4955
BD4954
BD4953
BD4952
BD4951
BD4950
BD4949
BD4948
BD4947
BD4946
BD4945
BD4944
BD4943
BD4942
Detection
Voltage
4.1V
4.0V
3.9V
3.8V
3.7V
3.6V
3.5V
3.4V
3.3V
3.2V
3.1V
3.0V
2.9V
2.8V
2.7V
2.6V
2.5V
2.4V
2.3V
Part
Number
BD4941
BD4940
BD4939
BD4998
BD4937
BD4936
BD4935
BD4934
BD4933
BD4932
BD4931
BD4930
BD4929
BD4928
BD4927
BD4926
BD4925
BD4924
BD4923
Part Number：BD4□
□ □ □
① ② ③
●Lineup
Marking
EW
EV
EU
ET
ES
ER
EQ
EP
EN
EM
EL
EK
EJ
EH
EG
EF
EE
ED
EC
Detection
Voltage
6.0V
5.9V
5.8V
5.7V
5.6V
5.5V
5.4V
5.3V
5.2V
5.1V
5.0V
4.9V
4.8V
4.7V
4.6V
4.5V
4.4V
4.3V
4.2V
Part
Number
BD4860
BD4859
BD4858
BD4857
BD4856
BD4855
BD4854
BD4853
BD4852
BD4851
BD4850
BD4849
BD4848
BD4847
BD4846
BD4845
BD4844
BD4843
BD4842
Marking
EB
EA
DV
DU
DT
DS
DR
DQ
DP
DN
DM
DL
DK
DJ
DH
DG
DF
DE
DD
Detection
Voltage
4.1V
4.0V
3.9V
3.8V
3.7V
3.6V
3.5V
3.4V
3.3V
3.2V
3.1V
3.0V
2.9V
2.8V
2.7V
2.6V
2.5V
2.4V
2.3V
①
②
③
Part
Number
BD4841
BD4840
BD4839
BD4838
BD4837
BD4836
BD4835
BD4834
BD4833
BD4832
BD4831
BD4830
BD4829
BD4828
BD4827
BD4826
BD4825
BD4824
BD4823
Marking
GW
GV
GU
GT
GS
GR
GQ
GP
GN
GM
GL
GK
GJ
GH
GG
GF
GE
GD
GC
Marking
GB
GA
FV
FU
FT
FS
FR
FQ
FP
FN
FM
FL
FK
FJ
FH
FG
FF
FE
FD
2007.Apr.
●Absolute
Maximum Rating (Ta=25℃)
Parameter
Power Supply Voltage
Output
Voltage
Power
Dissipation
Nch Open Drain Output
CMOS Output
SSOP5
VSOF5
*1
*3
*2
*3
Symbol
VDD–GND
VOUT
Limits
-0.3 ~ +10
GND -0.3 ~ +10
GND -0.3 ~ VDD +0.3
540
210
-40 ~ +105
-55 ~ +125
Unit
V
V
Pd
Topr
Tstg
mW
℃
℃
Operating Temperature
Ambient Storage Temperature
*
1
*
2
*
3
Use above Ta=25℃ results in a 5.4mW loss per degree.
Use above Ta=25℃ results in a 2.1mW loss per degree.
When a ROHM standard circuit board (70mm×70mm×1.6mm glass epoxy board) is mounted.
●Electrical
Characteristics (Unless specified otherwise, Ta=-40℃~+105℃)
Parameter
Detection Voltage
Detection Voltage
Temperature Coefficient
Hysteresis Voltage
Circuit Current at ON
Circuit Current at OFF
Operating Voltage Range
“Low” Output Current (Nch)
“High” Output Current (Pch)
*
*
*
*
Symbol
VS
VS/∆T
∆VS
IDD1
IDD2
VOPL
IOL
IOH
Min.
VS(T)×0.99
－
VS×0.03
－
－
0.95
2
1.1
Typ.
VS(T)
±100
VS×0.05
0.66
0.9
－
4
2.2
Max.
VS(T)×1.01
－
VS×0.08
1.98
2.7
－
－
－
Unit
V
Conditions
VDD=H→L, RL=470kΩ
ppm/
℃
Ta=-40 to +105℃ (Designed Guarantee)
V
µA
µA
V
mA
mA
VS≧1.1V, RL=470kΩ, VDD=L→H→L
VDD=VS-0.2V, VS=5.3½6.0V
VDD=VS+2.0V, VS=5.3½6.0V
VOL 0.4V
VDS=0.5V, VDD=2.4V, VS=2.7V½6.0V
VDS=0.5V, VDD=8.0V, VS=5.3V½6.0V
* Guarantee on Ta=25℃
Designed Guarantee. (Outgoing inspection is not done an all products.)
●Block
Diagrams
BD48□□G/FVE
V
DD
BD49□□G/FVE
V
DD
V
OUT
V
OUT
Vref
Vref
GND
GND
Fig.1
TOP VIEW
Fig.2
TOP VIEW
SSOP5
PIN No.
1
2
3
4
5
Symbol
VOUT
VDD
GND
N.C.
N.C.
Function
Reset Output
Power Supply Voltage
GND
Unconnected Terminal
Unconnected Terminal
PIN No.
1
2
3
4
5
Symbol
VOUT
SUB
N.C.
GND
VDD
VSOF5
Function
Reset Output
Substrate*
Unconnected Terminal
GND
Power Supply Voltage
＊Connect
the substrate to GND.
2/8
●Reference
Data (Unless specified otherwise, Ta=25℃)
CIRCUIT CURRENT
：
I
DD
[µA]
【
BD4842G/FVE
】
1.5
【
BD4842G/FVE
】
15
"HIGH" OUTPUT CURRENT
：
I
OH
[mA]
"LOW" OUTPUT CURRENT
：
I
OL
[mA]
2.0
20
45
40
35
30
25
20
15
10
5
0
0
1
2
3
4
5
6
DRAIN-SOURCE VOLTAGE
：
V
DS
[V]
V
DD
=8.0V
V
DD
=6.0V
V
DD
=4.8V
【
BD4942G/FVE
】
1.0
10
V
DD
=2.4V
0.5
5
V
DD
=1.2V
0
0.0
0.5
1.0
1.5
2.0
2.5
0.0
0
1
2
3
4
5
6
7
8
9 10
V
DD
SUPPLY VOLTAGE
：
V
DD
[V]
DRAIN-SOURCE VOLTAGE
：
V
DS
[V]
Fig.3 Circuit Current
Fig.4 “Low” Output Current
Fig.5 “High” Output Current
9
OUTPUT VOLTAGE
：
V
OUT
[V]
8
7
6
5
4
3
2
1
0
Ta=25
℃
0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
1.0
【
BD4842G/FVE
】
DETECTION VOLTAGE
：
V
S
[V]
【BD4842G/FVE】
OUTPUT VOLTAGE
：
V
OUT
[V]
0.8
5.4
5.0
4.6
4.2
3.8
3.4
3.0
½
½
-40
0
【BD4842G/FVE】
Low to High（V
S
+ΔV
S
）
0.6
0.4
Ta=25
℃
High to Low（V
S
）
0.2
0.0
0
0.5
1
1.5
2
2.5
SUPPLY VOLTAGE ： [V]
V
DD
SUPPLY VOLTAGE
：
V
DD
[V]
40
80
TEMPERATURE
：
Ta[℃]
Fig.6 I/O Characteristics
Fig.7 Operating Limit Voltage
Fig.8 Detection Voltage
Release Voltage
CIRCUIT CURRENT WHEN ON
：
I
DD1
[μA]
CIRCUIT CURRENT WHEN OFF
：
I
DD2
[μA]
1.5
1.5
1.5
【
BD4842G/FVE
】
【
BD4842G/FVE
】
MINIMUM OPERATION VOLTAGE
：
V
OPL
[V]
【
BD4842G/FVE
】
1.0
1.0
1.0
0.5
0.5
0.5
0.0
-40 -20
0
20
40
60
80 100
0.0
-40 -20
0
20
40
60
80 100
0.0
-40 -20
0
20
40
60
80 100
TEMPERATURE
：
Ta[
℃
]
TEMPERATURE
：
Ta[
℃
]
TEMPERATURE
：
Ta[
℃
]
Fig.9 Circuit Current when ON
Fig.10 Circuit Current when OFF
Fig.11 Operating Limit Voltage
3/8
●Reference
Data
Examples of Leading (TPLH) and Falling (TPHL) Output
Part Number
BD4845G/FVE
BD4945G/FVE
*
This
TPLH (µs)
39.5
32.4
VDD=4.3V→5.1V
TPHL (µs)
87.8
52.4
VDD=5.1V→4.3V
data is for reference only.
The figures will vary with the application, so please confirm actual operating conditions before use.
●Explanation
of Operation
For both the open drain type (Fig. 12) and the CMOS output type (Fig. 13), the detection and release voltages are used as threshold voltages.
When the voltage applied to the VDD pins reaches the applicable threshold voltage, the VOUT terminal voltage switches from either “High” to
“Low” or from “Low” to “High”. Because the BD48□□G/FVE series uses an open drain output type, it is possible to connect a pull-up resistor to
VDD or another power supply [The output “High” voltage (VOUT) in this case becomes VDD or the voltage of the other power supply].
V
DD
R1
Vref
V
OUT
R2
Q1
Q1
R2
V
OUT
V
DD
R
L
Vref
R1
Q2
R3
GND
R3
GND
Fig.12 (BD48□□ Type Internal Block Diagram)
Fig.13 (BD49□□ Type Internal Block Diagram)
●Timing
Waveform
Example: the following shows the relationship between the input voltages VDD and the output voltage VOUT when the input power supply
voltage VDD is made to sweep up and sweep down (the circuits are those in Fig. 12 and 13).
①
When the power supply is turned on, the output is unsettled from after
over the operating limit voltage (VOPL) until TPHL. There fore it is
possible that the reset signal is not outputted when the rise time of
VDD is faster than TPHL.
②
③
When VDD is greater than VOPL but less than the reset release
voltage (VS +
∆VS),
the output voltages will switch to Low.
If VDD exceeds the reset release voltage (VS +
∆VS),
then VOUT
switches from L to H.
If VDD drops below the detection voltage (VS) when the power supply
is powered down or when there is a power supply fluctuation, VOUT
switches to L (with a delay of TPHL).
⑤
The potential difference between the detection voltage and the release
voltage is known as the hysteresis width (∆VS). The system is
designed such that the output does not flip-flop with power supply
fluctuations within this hysteresis width, preventing malfunctions due to
noise.
V
DD
V
DET
+ΔV
DET
V
DET
0V
V
OPL
⑤
V
OUT
V
OH
T
PHL
V
OL
T
PLH
T
PHL
T
PLH
④
①
②
Fig.14
③
④
4/8
●Circuit
Applications
1）Examples of a common power supply detection reset circuit.
V
DD1
R
L
BD48□□□
Microcontroller
V
DD2
Application examples of BD48□□G/FVE series (Open Drain
output type) and BD49□□G/FVE series (CMOS output type) are
shown below.
CASE1: the power supply of the microcontroller (VDD2) differs
from the power supply of the reset detection (VDD1).
Use the open drain output type (BD48□□G/FVE) attached a
load resistance (RL) between the output and VDD2. (As shown
Figure 15)
C
L
（Noise-filtering
Capacitor）
GND
Fig.15 Open Collector Output Type
CASE2: the power supply of the microcontroller (VDD1) is same
as the power supply of the reset detection (VDD1).
Use CMOS output type (BD49□□G/FVE) or open drain output
type (BD48□□G/FVE) attached a load resistance (RL) between
the output and Vdd1. (As shown Figure 16)
V
DD1
BD49□□□
Microcontroller
When a capacitance CL for noise filtering is connected to the
VOUT pin (the reset signal input terminal of the microcontroller),
please take into account the waveform of the rise and fall of the
C
L
GND
(Noise-filtering
Capacitor）
output voltage (VOUT).
Fig.16 CMOS Output Type
2) The following is an example of a circuit application in which an OR connection between two types of detection voltages resets the
microcontroller.
V
DD1
V
DD2
V
DD3
R
L
Microcontroller
R
ST
BD48□□□
BD48□□□
GND
Fig.17
When there are many power supplies of the system, power supplies VDD1 and VDD2 are being monitored separately, and it is necessary
to reset the microcomputer, it is possible to use an OR connection on the open drain output type BD48□□G/FVE series to pull-up to the
desired voltage (VDD3) as shown in Fig. 17 and make the output “High” voltage matches the power supply voltage VDD3 of the
microcontroller.
5/8
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