BU4940 Datasheet PDF - ROHM Semiconductor
| Part Number | BU4940 | |
| Description | Low Voltage Standard CMOS Voltage Detector IC Series | |
| Manufacturers | ROHM Semiconductor | |
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Voltage Detector IC Series
Low Voltage Standard
CMOS Voltage Detector IC Series
BU48□□G, BU48□□F, BU48□□FVE, BU49□□G, BU49□□F, BU49□□FVE series
No.09006ECT01
Description
ROHM standard CMOS reset IC series is a high-accuracy low current consumption reset IC series.
The lineup was est ablished with t wo o utput ty pes (Nch open dra in an d CMOS output) and detection volt age ran ge 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
1) Detection voltage from 0.9V to 4.8V in 0.1V increments
2) Highly accurate detection voltage: ±1.0%
3) Ultra-low current consumption
4) Nch open drain output (BU48□□G/F/FVE)and CMOS output (BU49□□G/F/FVE)
5) Small surface package
SSOP5: BU48□□G，BU49□□G
SOP4:
BU48□□F，BU49□□F
VSOF5:
BU48□□FVE，BU49□□FVE
Applications
All electronics devices that use microcontrollers and logic circuits.
Selection Guide
Part Number : BU4
12 3
No.
Specifications Descripti
on
1 Output Circuit Format 8:Open Drain Output, 9:CMOS Output
2 Detection Voltage
Example V DET: Represented as 0.1V step s in th e
range from 0.9V to 4.8V
3 Package
(Displayed as 0.9 in the case of 0.9V)
G:SSOP5(SMP5C2)/ F:SOP4/ FVE:VSOF5(EMP5)
Lineup
Detection
Making
voltage
JR 4.8V
JQ 4.7V
JP 4.6V
JN 4.5V
JM 4.4V
JL 4.3V
JK 4.2V
JJ 4.1V
JH 4.0V
JG 3.9V
JF 3.8V
JE 3.7V
JD 3.6V
JO 3.5V
JB 3.4V
JA 3.3V
HZ 3.2V
HY 3.1V
HX 3.0V
HW 2.9V
Part
Number
BU4848
BU4847
BU4846
BU4845
BU4844
BU4843
BU4842
BU4841
BU4840
BU4839
BU4838
BU4837
BU4836
BU4835
BU4834
BU4833
BU4832
BU4831
BU4830
BU4829
Detection
Making
voltage
HV 2.8V
HU 2.7V
HT 2.6V
HS 2.5V
HR 2.4V
HQ 2.3V
HP 2.2V
HN 2.1V
HM 2.0V
HL 1.9V
HK 1.8V
HJ 1.7V
HH 1.6V
HG 1.5V
HF 1.4V
HE 1.3V
HD 1.2V
HC 1.1V
HB 1.0V
HA 0.9V
Part
Number
Detection
Making
voltage
Part
Number
BU4828 LH
4.8V BU4948
BU4827
LG
4.7V
BU4947
BU4826
LF 4.6V
BU4946
BU4825
LE
4.5V
BU4945
BU4824 LD
4.4V BU4944
BU4823 LC
4.3V BU4943
BU4822
LB
4.2V
BU4942
BU4821
LA
4.1V
BU4941
BU4820 KZ
4.0V BU4940
BU4819
KY
3.9V
BU4939
BU4818
KX
3.8V
BU4938
BU4817 KW
3.7V
BU4937
BU4816
KV
3.6V
BU4936
BU4815
KU
3.5V
BU4935
BU4814 KT
3.4V BU4934
BU4813
KS
3.3V
BU4933
BU4812
KR
3.2V
BU4932
BU4811
KQ
3.1V
BU4931
BU4810
KP
3.0V
BU4930
BU4809
KN
2.9V
BU4929
Detection
Making
voltage
KM 2.8V
KL 2.7V
KK 2.6V
KJ 2.5V
KH 2.4V
KG 2.3V
KF 2.2V
KE 2.1V
KD 2.0V
KC 1.9V
KB 1.8V
KA 1.7V
JZ 1.6V
JY 1.5V
JX 1.4V
JW 1.3V
JV 1.2V
JU 1.1V
JT 1.0V
JS 0.9V
Part
Number
BU4928
BU4927
BU4926
BU4925
BU4924
BU4923
BU4922
BU4921
BU4920
BU4919
BU4918
BU4917
BU4916
BU4915
BU4914
BU4913
BU4912
BU4911
BU4910
BU4909
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
1/8
2009.06 - Rev .C http://www.Datasheet4U.com
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BU48□□G, BU48□□F, BU48□□FVE, BU49□□G, BU49□□F, BU49□□FVE series Technical Note
Reference Data
Examples of Output rising value(TPLH)and Output falling value(TPHL)
Part Number
TPLH[µs] T
PHL[µs]
BU4845G/F/FVE
23.3
275.9
BU4945G/F/FVE
3.5
354.3
VDD=4.3V5.1V
VDD=5.1V4.3V
* This data is for reference only.
This figure will vary with the application, so please confirm actual operation 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 “Hi gh” to “Low” or fro m “Low” to “Hi gh”. Because the BU4 8□□G/F/FVE series uses a n
open drain output type, it is possibl e to connect a pull-up resistor to VDD or another p ower supply [The output “High” voltage
(VOUT) in this case becomes VDD or the voltage of the other power supply].
VDD
VDD
VDD
R1
Vref
R2
VOUT
RL
RESET
R1
Vref
R2
Q2
VOUT RESET
Q1
R3
Q1
R3
GND
GND
Fig.12 (BU48□□ type internal block diagram)
Fig.13 (BU49□□ type internal block diagram)
Timing Waveforms
Example:The following shows the relationship between the input voltage VDD, the CT Terminal Voltage VCT and the o utput
voltage VOUT when the i nput po wer sup ply voltage VDD is made to s weep up and s weep do wn (T he circuits are thos e in
Fig.12 and 13).
1 When the po wer suppl y is turned on, the o utput is unsettl ed
from af ter ove r the op erating limit vo ltage (V OPL) until T PHL.
VDD Therefore it is possibl e that the reset signal is not out putted
VDET+ΔVDET
VDET
⑤ when the rise time of VDD is faster than TPHL.
2 When VDD is greater than VOPL but less than the reset release
VOPL
0V
voltage (VDET + VDET), output (VOUT) voltages will switch to L.
3 If VDD exceeds the reset release voltage (VDET + VDET), then
VOUT
VOUT switches from L to H (with a delay of TPLH).
VOH 4 If V DD drop s below t he detection v oltage (V DET) w hen the
TPHL TPLH TPLH power supply is powered down or when there is a power supply
VOL
TPHL
①②③ ④
fluctuation, VOUT switches to L (with a delay of TPHL).
5 The potential deference bet ween th e dete ction volt age and
the release voltage is known as the hysteresis width (VDET). The
Fig.14
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.
5/8
2009.06 - Rev .C
Preview 5 Page |
Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for BU4940 electronic component. |
| Information | Total 9 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ BU4940.PDF Datasheet ] | |
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Featured Datasheets
| Part Number | Description | MFRS |
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