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Voltage Detector IC Series
Bipolar
Voltage Detector IC
BD47□□G Series
●General Description
The BD47□□G Series is a reset IC that was developed to prevent system errors at transient state when the power of CPU or logic circuit
switches ON/OFF or momentary shut down. These ICs consist of three terminals (power supply, GND and reset output) to detect power
supply voltages and outputs reset signals of various systems. These ICs are ultra-compact and are realized low current consumption,
making them ideal for portable products.
●Features
1）
Detection voltage range: 0.1-volt step line-up 1.9-4.6V (Typ.)
2）
High accuracy voltage detection: ±1%
3）
Low current consumption
4）
Open collector "L" reset output
5）
Compact SSOP5 package
●Applications
All electronic devices that use microcontrollers and logic circuits
●
Selection Guide
Part Number
●Lineup
Marking
B2
B1
BZ
BY
BX
BW
BV
BU
BT
BS
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TECHNICAL NOTE
：BD47□ □ G
①
Detection
Part Number
Marking
Voltage
4.6V
BD4746
4.5V
BD4745
4.4V
BD4744
4.3V
BD4743
4.2V
BD4742
4.1V
BD4741
BM
4.0V
BD4740
3.9V
BD4739
3.8V
BD4738
3.7V
BD4737
Number
Specifications
Detection
①
Voltage
Detection
Part Number
Voltage
BR
3.6V
BD4736
BQ
3.5V
BD4735
BP
3.4V
BD4734
B4
3.3V
BD4733
BN
3.2V
BD4732
3.1V
BD4731
BL
2.0V
BD4730
BK
2.9V
BD4729
BJ
2.8V
BD4728
B3
2.7V
BD4727
Description
Example: Voltage range over 1.9V-4.6V in 0.1V
increments.
2.9V is marked as "29"
Detection
Marking
Voltage
BH
2.6V
BG
2.5V
BF
2.4V
BE
2.3V
BD
2.2V
BC
2.1V
BB
2.0V
BA
1.9V
Part Number
BD4726
BD4725
BD4724
BD4723
BD4722
BD4721
BD4720
BD4719
2007.Apr.
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Summary of Contents for Rohm BD47 G Series
- Page 1 TECHNICAL NOTE Voltage Detector IC Series Bipolar Voltage Detector IC BD47□□G Series ●General Description The BD47□□G Series is a reset IC that was developed to prevent system errors at transient state when the power of CPU or logic circuit switches ON/OFF or momentary shut down. These ICs consist of three terminals (power supply, GND and reset output) to detect power supply voltages and outputs reset signals of various systems.
- Page 2 Ambient Storage Temperature Tstg -55 ~ +125 ℃ 1 When a ROHM standard circuit board (70mm×70mm×1.6mm glass epoxy board) is mounted. 2 When used at temperatures higher than Ta=25℃, the power is reduced by 5.4mW/℃ ●Electrical Characteristics (Unless specified otherwise, Ta=-25℃~+105℃) Parameter Symbol Min.
- Page 3 ●Reference Data (Unless specified otherwise, Ta=25℃) 【 BD4729G 】 【 BD4729G 】 【 BD4729G 】 =12.194mA at Vo=400mV =2.90V =2.95V Icc1=1.34µA =50mV Icc2=1.46µA 9 10 SUPPLY VOLTAGE ： V OUTPUT VOLTAGE ： V [mV] SUPPLY VOLTAGE ： Vc Fig.2 Circuit Current Fig.3 “Low”...
- Page 4 ●Explanation of Operation BD47 □□ G series has the detection voltages and release voltages as threshold voltages and, as the voltages applied to the input reach their respective threshold voltages, the output switches from “High” to “Low” and from “Low” to “High”. The release voltage has a hysteresis that is the detection voltage +50mV (Typ.), preventing chattering in the output.
- Page 5 ●Circuit Applications 1 ） The following is an example of an application circuit using Reset IC for normal power supply detection. BD47 □□ G series requires a pull up resistor on the output terminal. The pull up resister value should be decided. As the application with enough confirmation of power supply level and output current capability.
- Page 6 3）The following is an example of an application circuit in which an OR connection between two types of detection voltage. BD47□□G BD47□□G Micro- No.1 No.2 contoller Fig.14 When there are several system power supplies and it is necessary to monitor power supplies VCC1 and VCC2 independently as well as reset the microcontroller, the following application (as shown in Fig.
-
Page 7: Operation Notes
Operation Notes Absolute maximum range Absolute Maximum Ratings are those values beyond which the life of a device may be destroyed. We cannot be defined the failure mode, such as short mode or open mode. Therefore a physical security countermeasure, like fuse, is to be given when a specific mode to be beyond absolute maximum ratings is considered. - Page 8 Any data, including, but not limited to application circuit diagrams and information, described herein are intended only as illustrations of such devices and not as the specifications for such devices. ROHM CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any third party's intellectual property rights or other proprietary rights, and further, assumes no liability of whatsoever nature in the event of any such infringement, or arising from or connected with or related to the use of such devices.
- Page 9 ROHM cannot be held responsible for any damages arising from the use of the products under conditions out of the range of the specifications or due to non-compliance with the NOTES specified in this catalog.
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