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PDF BD4998 Data sheet ( Hoja de datos )
| Número de pieza | BD4998 | |
| Descripción | Standard CMOS Voltage Detector IC | |
| Fabricantes | ROHM Semiconductor | |
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Voltage Detector IC Series
Standard CMOS
Voltage Detector IC
BD48□□G, BD48□□FVE, BD49□□G, BD49□□FVE series
No.09006EAT04
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) Detection voltage: 2.3V to 6.0V (Typ.), 0.1V steps
2) High accuracy detection voltage: ±1.0%
3) Ultra-low current consumption: 0.8μA (Typ.)
4) Nch open drain output (BD48□□G/FVE), CMOS output (BD49□□G/FVE)
5) Compact packages VSOF5: BD48□□FVE, BD49□□FVE
SSOP5: BD48□□G, BD49□□G
Applications
All electronic devices that use microcontrollers and logic circuits
Selection Guide
Part Number : BD4
12 3
No. Specifications
1 Output Circuit Format
2 Detection Voltage
3 Package
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
Lineup
Marking
Detection
Voltage
EW 6.0V
EV 5.9V
EU 5.8V
ET 5.7V
ES 5.6V
ER 5.5V
EQ 5.4V
EP 5.3V
EN 5.2V
EM 5.1V
EL 5.0V
EK 4.9V
EJ 4.8V
EH 4.7V
EG 4.6V
EF 4.5V
www.DaEtaESheet4U4..4cVom
ED 4.3V
EC 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
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
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
BD4960
BD4959
BD4958
BD4957
BD4956
BD4955
BD4954
BD4953
BD4952
BD4951
BD4950
BD4949
BD4948
BD4947
BD4946
BD4945
BD4944
BD4943
BD4942
Marking
GB
GA
FV
FU
FT
FS
FR
FQ
FP
FN
FM
FL
FK
FJ
FH
FG
FF
FE
FD
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
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
1/9
2009.04 - Rev.A
1 page  
BD48□□G, BD48□□FVE, BD49□□G, BD49□□FVE series
Technical Note
Reference Data
Examples of Leading (TPLH) and Falling (TPHL) Output
Part Number
TPLH (μs)
TPHL (μs)
BD4845G/FVE
39.5
87.8
BD4945G/FVE
32.4
52.4
VDD=4.3V5.1V
VDD=5.1V4.3V
*This 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].
VDD
R1
Vref
R2
RL
VOUT
Q1
R3
GND
Fig.12 (BD48□□ Type Internal Block Diagram)
R1
Vref
VDD
Q2
VOUT
R2
Q1
R3
GND
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).
VDD
VDET+ΔVDET
VDET
VOPL
0V
VOUT
VOH
TPHL
VOL
①
TPLH
TPHL
②③
Fig.14
www.DataSheet4U.com
⑤
TPLH
④
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 When VDD is greater than VOPL but less than the reset release
voltage (VS + ∆VS), the output voltages will switch to Low.
3 If VDD exceeds the reset release voltage (VS + ∆VS), then
VOUT switches from L to H.
4 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.
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
5/9
2009.04 - Rev.A
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet BD4998.PDF ] | |
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