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Voltage Detector IC Series
Low Voltage Standard CMOS Voltage Detector IC Series
BU48G, BU48F, BU48FVE, BU49G, BU49F, BU49FVE series
No.09006ECT01
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 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 (BU48G/F/FVE)and CMOS output (BU49G/F/FVE) 5) Small surface package SSOP5: BU48GBU49G SOP4: BU48FBU49F VSOF5: BU48FVEBU49FVE Applications All electronics devices that use microcontrollers and logic circuits. Selection Guide No.
1
Specifications Output Circuit Format Detection Voltage Package
Description 8:Open Drain Output, 9:CMOS Output
Example VDET: Represented as 0.1V steps in the range from 0.9V to 4.8V (Displayed as 0.9 in the case of 0.9V) G:SSOP5(SMP5C2)/ F :SOP4/ FVE:VSOF5(EMP5)
Part Number : BU4
2
1
2
3
3
Lineup
Making Detection voltage Part Number Making Detection voltage Part Number Making Detection voltage Part Number Making Detection voltage Part Number
JR JQ JP JN JM JL JK JJ JH JG JF JE JD JO JB JA HZ HY HX HW
4.8V 4.7V 4.6V 4.5V 4.4V 4.3V 4.2V 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
BU4848 BU4847 BU4846 BU4845 BU4844 BU4843 BU4842 BU4841 BU4840 BU4839 BU4838 BU4837 BU4836 BU4835 BU4834 BU4833 BU4832 BU4831 BU4830 BU4829
HV HU HT HS HR HQ HP HN HM HL HK HJ HH HG HF HE HD HC HB HA
2.8V 2.7V 2.6V 2.5V 2.4V 2.3V 2.2V 2.1V 2.0V 1.9V 1.8V 1.7V 1.6V 1.5V 1.4V 1.3V 1.2V 1.1V 1.0V 0.9V
BU4828 BU4827 BU4826 BU4825 BU4824 BU4823 BU4822 BU4821 BU4820 BU4819 BU4818 BU4817 BU4816 BU4815 BU4814 BU4813 BU4812 BU4811 BU4810 BU4809
LH LG LF LE LD LC LB LA KZ KY KX KW KV KU KT KS KR KQ KP KN
4.8V 4.7V 4.6V 4.5V 4.4V 4.3V 4.2V 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
BU4948 BU4947 BU4946 BU4945 BU4944 BU4943 BU4942 BU4941 BU4940 BU4939 BU4938 BU4937 BU4936 BU4935 BU4934 BU4933 BU4932 BU4931 BU4930 BU4929
KM KL KK KJ KH KG KF KE KD KC KB KA JZ JY JX JW JV JU JT JS
2.8V 2.7V 2.6V 2.5V 2.4V 2.3V 2.2V 2.1V 2.0V 1.9V 1.8V 1.7V 1.6V 1.5V 1.4V 1.3V 1.2V 1.1V 1.0V 0.9V
BU4928 BU4927 BU4926 BU4925 BU4924 BU4923 BU4922 BU4921 BU4920 BU4919 BU4918 BU4917 BU4916 BU4915 BU4914 BU4913 BU4912 BU4911 BU4910 BU4909
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1/8
2009.06 - Rev.C
BU48G, BU48F, BU48FVE, BU49G, BU49F, BU49FVE series Technical Note
Absolute maximum ratings (Ta=25C) Parameter Power Supply Voltage Nch Open Drain Output Output Voltage CMOS Output *1*4 SSOP5 Power *2*4 SOP4 Dissipation *3*4 VSOF5 Operating Temperature Ambient Storage Temperature
*1 *2 *3 *4
Symbol VDD-GND VOUT
Pd Topr Tstg
Limits -0.3 ~ +7 GND-0.3 ~ +7 GND-0.3 ~ VDD+0.3 540 400 210 -40 ~ +125 -55 ~ +125
Unit V V
mW C C
When used at temperatures higher than Ta=25C, the power is reduced by 5.4mW per 1C above 25C. When used at temperatures higher than Ta=25C, the power is reduced by 4.0mW per 1C above 25C. When used at temperatures higher than Ta=25C, the power is reduced by 2.1mW per 1C above 25C. When a ROHM standard circuit board (70mmx70mmx1.6mm, glass epoxy board)is mounted.
Electrical characteristics Parameter Symbol Condition BU4848 BU4847 BU4846 BU4845 BU4844 BU4843 BU4842 BU4841 BU4840 BU4839 BU4838 BU4837 BU4836 BU4835 BU4834 BU4833 BU4832 BU4831 BU4830 BU4829 BU4828 BU4827 BU4826 BU4825 BU4824 BU4823 BU4822 BU4821 BU4820 BU4819 BU4818 BU4817 BU4816 BU4815 BU4814 BU4813 BU4812 BU4811 BU4810 BU4809 Min. 4.752 4.653 4.554 4.455 4.356 4.257 4.158 4.059 3.960 3.861 3.762 3.663 3.564 3.465 3.366 3.267 3.168 3.069 2.970 2.871 2.772 2.673 2.574 2.475 2.376 2.277 2.178 2.079 1.980 1.881 1.782 1.683 1.584 1.485 1.386 1.287 1.188 1.089 0.990 0.891 VDET1.0V VDET1.1V VDET x0.03 VDET x0.03 Limit Typ. 4.800 4.700 4.600 4.500 4.400 4.300 4.200 4.100 4.000 3.900 3.800 3.700 3.600 3.500 3.400 3.300 3.200 3.100 3.000 2.900 2.800 2.700 2.600 2.500 2.400 2.300 2.200 2.100 2.000 1.900 1.800 1.700 1.600 1.500 1.400 1.300 1.200 1.100 1.000 0.900 30 VDET x0.05 VDET x0.05 Max. 4.848 4.747 4.646 4.545 4.444 4.343 4.242 4.141 4.040 3.939 3.838 3.737 3.636 3.535 3.434 3.333 3.232 3.131 3.030 2.929 2.828 2.727 2.626 2.525 2.424 2.323 2.222 2.121 2.020 1.919 1.818 1.717 1.616 1.515 1.414 1.313 1.212 1.111 1.010 0.909 VDET x0.08 VDET x0.07 Unit
VDD=HL , Ta=25C Detection Voltage VDET RL=470k
V
Detection Voltage Temperature Coefficient Hysteresis Voltage
VDET/T VDET
Ta=-40C~125C VDD=LHL Ta=-40C~125C RL=470k
*1
ppm/C V
*1 Designed Guarantee.(Outgoing inspection is not done on all products.) *This product is not designed for protection against radioactive rays.
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2/8
2009.06 - Rev.C
BU48G, BU48F, BU48FVE, BU49G, BU49F, BU49FVE series Technical Note
Electrical characteristics (Unless Otherwise Specified Ta=-25 to 125C) Parameter Symbol Condition VDET =0.9-1.3V VDET =1.4-2.1V VDET =2.2-2.7V VDD=VDET-0.2V 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 VDET =2.2-2.7V VDD=VDET+2.0V VDET =2.8-3.3V VDET =3.4-4.2V VDET =4.3-4.8V VOL0.4V, Ta=25~125C, RL=470k VOL0.4V, Ta=-40~25C, RL=470k VDS=0.05V VDD=0.85V VDS=0.5V VDD=1.5V VDET=1.7-4.8V VDS=0.5V VDD=2.4V VDET=2.7-4.8V VDS=0.5V VDD=4.8V VDET=0.9-3.9V VDS=0.5V VDD=6.0V VDET=4.0-4.8V VDD=VDS=7V Ta=-40C~85C VDD=VDS=7V Ta=85C~125C Min. 0.70 0.90 20 1.0 4.0 1.7 2.0 Limit Typ. 0.15 0.20 0.25 0.30 0.35 0.40 0.30 0.35 0.40 0.45 0.50 0.55 100 3.3 7.2 3.4 4.0 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 0.1 A 1 Unit
Circuit Current when ON
IDD1
A
Circuit Current when OFF
IDD2
A
Operating Voltage Range
VOPL
V A mA mA
`Low' Output Current (Nch) `High' Output Current (Pch) (only BU49G/F/FVE) Output Leak Current when OFF (only BU48G/F/FVE)
IOL
IOH
Ileak
* This product is not designed for protection against radioactive rays.
Block Diagrams BU48G/F/FVE
VDD
BU49G/F/FVE
VDD
VOUT
VOUT
Vref
Vref
GND
GND
Fig.1
TOP VIEW 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 VOUT VDD N.C. GND
SOP4
Symbol Function Reset output Power supply voltage Unconnected terminal GND PIN No. 1 2 3 4 5 Symbol VOUT SUB N.C. VDD GND
VSOF5
Function Reset output Substrate* Unconnected terminal Power supply voltage GND
*Connect the substrate to VDD
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3/8
2009.06 - Rev.C
BU48G, BU48F, BU48FVE, BU49G, BU49F, BU49FVE series Technical Note
Reference Data (Unless specified otherwise, Ta=25C)
0.6 IDD [A] BU4816F 0.5 0.4 0.3 0.2 0.1 0.0 0 1 2 3 4 5 6 7
5 4 3 2 1 0 0.0
"LOW" OUTPUT CURRENT IOL [mA]
25
BU4816F
BU4916F 20 15 VDD=4.8V 10 5 0 VDD=6.0V
VDD=1.2V
0.5
1.0
1.5
2.0
2.5
"HIGH" OUTPUT CURRENT I OH [mA]
CIRCUIT CURRENT
0
1
2
3
4
5
6
VDD SUPPLY VOLTAGE VDD[V]
DRAIN-SOURCE VOLTAGE VDS[V]
DRAIN-SOURCE VOLTAGE VDS[V]
Fig.3 Circuit Current
Fig.4 "LOW" Output Current
Fig.5 "High" Output Current
7 OUTPUT VOLTAGE VOUT [V] BU4816F 6 5 4 3 2 1 0
0 1 2 3 4 5 6 7
1.0 DETECTION VOLTAGE VDET[V] OUTPUT VOLTAGE VOUT [V] BU4816F 0.8 0.6 0.4 0.2 0.0 0.0
2.0 Low to high(VDET+VDET)
1.5 High to low(VDET)
BU4816F 1.0 -40 0 40 80 120
0.5
1.0
1.5
2.0
2.5
VDD SUPPLY VOLTAGE VDD[V]
VDD SUPPLY VOLTAGE VDD[V]
TEMPERATURE Ta[]
Fig.6 I/O Characteristics
Fig.7 Operating Limit Voltage
Fig.8 Detecting Voltage Release Voltage
CIRCUIT CURRENT WHEN ON IDD1 [A]
CIRCUIT CURRENT WHEN OFF IDD2 [A]
0.5 BU4816F 0.4
1.0 BU4816F 0.8 0.6 0.4 0.2 0.0 -40
VOPL [V]
1.0 BU4816F 0.8 0.6 0.4 0.2 0.0 -40
0.3 0.2
0.1 0.0 -40
0
40
80
120
0
40
80
120
MINIMUM OPERATING VOLTAGE
0
40
80
120
TEMPERATURE Ta[]
TEMPERATURE Ta[]
TEMPERATURE Ta[]
Fig.9 Circuit Current when ON
Fig.10 Circuit Current when OFF
Fig.11 Operating Limit Voltage
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4/8
2009.06 - Rev.C
BU48G, BU48F, BU48FVE, BU49G, BU49F, BU49FVE series Technical Note
Reference Data Examples of Output rising value(TPLH)and Output falling value(TPHL) Part Number TPLH[s] TPHL[s] 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 "High" to "Low" or from "Low" to "High". Because the BU48G/F/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 VDD
VDD
R1 Vref RL RESET R2 VOUT Q1
Vref
R1 Q2
R2 VOUT Q1 RESET
R3
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 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. VDD Therefore it is possible that the reset signal is not outputted VDET+VDET when the rise time of VDD is faster than TPHL. VDET 2 When VDD is greater than VOPL but less than the reset release VOPL voltage (VDET + VDET), output (VOUT) voltages will switch to L. 0V 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 VDD drops below the detection voltage (VDET) when the TPLH TPHL TPLH power supply is powered down or when there is a power supply TPHL fluctuation, VOUT switches to L (with a delay of TPHL). VOL 5 The potential deference between the detection voltage and the release voltage is known as the hysteresis width (VDET). The system is designed such that the output does not flip-flop with Fig.14 power supply fluctuations within this hysteresis width, preventing malfunctions due to noise.
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5/8
2009.06 - Rev.C
BU48G, BU48F, BU48FVE, BU49G, BU49F, BU49FVE series Technical Note
Circuit Applications 1) Examples of a common power supply detection reset circuit
VDD1 RL
Microcontroller
VDD2
Application examples of BU48G/F/FVE series (Open Drain output type) and BU49G/F/FVE series (CMOS output type) are shown below.
BU48 CIN CL
(Capac it or for noise filtering)
RST
Fig.15 Open collector Output type
VDD1
CASE1:The power supply of the microcontroller (VDD2) differs from the power supply of the reset detection (VDD1). Use the Open Drain Output Type (BU48G/FVE) attached a load resistance (RL) between the output and VDD2. (As shown Fig.15) GND CASE2:The power supply of the microcontroller (VDD1) is same as the power supply of the reset detection (VDD1). Use CMOS output type (BU43G/FVE) or Open Drain Output Type (BU48G/FVE) attached a load resistance (RL) between the output and VDD1. Microcontroller (As shown Fig.16)
RST
BU49 CIN CL
(Capacitor for nois e filtering)
GND
When a capacitance CL for noise filtering or setting the output delay time 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 output voltage (Vout).
Fig.16 CMOS Output type
2) Examples of the power supply with resistor dividers In applications where the power supply input terminal (VDD) of an IC with resistor dividers, it is possible that a through-current will momentarily flow into the circuit when the output logic switches, resulting in malfunctions (such as output oscillatory state). (Through-current is a current that momentarily flows from the power supply (VDD) to ground (GND) when the output level switches from "High" to "Low" or vice versa.) Consider the use of BD48 when the power supply input it with resistor dividers.
V1
R2 I1 VDD
CIN R1
BU48 BU49 CL GND
VOUT
Fig.17
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6/8
2009.06 - Rev.C
BU48G, BU48F, BU48FVE, BU49G, BU49F, BU49FVE series Technical Note
Operation Notes 1 . 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. 2 . GND potential GND terminal should be a lowest voltage potential every state. Please make sure all pins that are over ground even if include transient feature. 3 . Electrical Characteristics Be sure to check the electrical characteristics, that are one the tentative specification will be changed by temperature, supply voltage, and external circuit. 4 . Bypass Capacitor for Noise Rejection Please put into the to reject noise between VDD pin and GND with 1uF over and between VOUT pin and GND with 1000pF. If extremely big capacitor is used, transient response might be late. Please confirm sufficiently for the point. 5 . Short Circuit between Terminal and Soldering Don't short-circuit between Output pin and VDD pin, Output pin and GND pin, or VDD pin and GND pin. When soldering the IC on circuit board please is unusually cautious about the orientation and the position of the IC. When the orientation is mistaken the IC may be destroyed. 6 . Electromagnetic Field Mal-function may happen when the device is used in the strong electromagnetic field. 7. 8. 9. The VDD line inpedance might cause oscillation because of the detection current. A VDD -GND capacitor (as close connection as possible) should be used in high VDD line impedance condition. Lower than the mininum input voltage makes the VOUT high impedance, and it must be VDD in pull up (VDD) condition.
10. Recommended value of RL Resistar is over 10k (VDET=1.5V~4.8V), over 100k (VDET=0.9~1.4V). 11. This IC has extremely high impedance terminals. Small leak current due to the uncleanness of PCB surface might cause unexpected operations. Application values in these conditions should be selected carefully. If 10M leakage is assumed between the CT terminal and the GND terminal, 1M connection between the CT terminal and the VDD terminal would be recommended. Also, if the leakage is assumed between the VOUT terminal and the GND terminal, the pull up resistor should be less than 1/10 of the assumed leak resistance. 12. External parameters For RL, the recommended range is 10k~1M. There are many factors (board layout, etc) that can affect characteristics. Please verify and confirm using practical applications. 13. Power on reset operation Please note that the power on reset output varies with the Vcc rise up time. Please verify the actual operation. 14. Precautions for board inspection Connecting low-impedance capacitors to run inspections with the board may produce stress on the IC. Therefore, be certain to use proper discharge procedure before each process of the test operation. To prevent electrostatic accumulation and discharge in the assembly process, thoroughly ground yourself and any equipment that could sustain ESD damage, and continue observing ESD-prevention procedures in all handing, transfer and storage operations. Before attempting to connect components to the test setup, make certain that the power supply is OFF. Likewise, be sure the power supply is OFF before removing any component connected to the test setup. 15. When the power supply, is turned on because of incertain cases, momentary Rash-current flow into the IC at the logic unsettled, the couple capacitance, GND pattern of width and leading line must be considered.
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7/8
2009.06 - Rev.C
BU48G, BU48F, BU48FVE, BU49G, BU49F, BU49FVE series Technical Note
Part Number Selection
B
U
4
8
0
9
G
T
R
BU48: Standard CMOS reset IC Open drain type BU49: Standard CMOS reset IC CMOS Output type
Detection voltage 09: 0.9V (0.1V step) 48: 4.8V
Package G: SSOP5 F: SOP4 FVE: VSOF5
Taping Specifications Embossed Taping
SSOP5
2.90.2
5 4
+6 4 -4

Tape Quantity Direction of feed Embossed carrier tape 3000pcs TR
The direction is the 1pin of product is at the upper right when you hold
+0.2 1.6 -0.1
2.80.2
1
2
3
0.2Min.
( reel on the left hand and you pull out the tape on the right hand
1pin
)
+0.05 0.13 -0.03
1.25Max.
1.10.05
0.050.05
+0.05 0.42 -0.04 0.95 0.1
Direction of feed
(Unit : mm)
Reel
Order quantity needs to be multiple of the minimum quantity.
SOP4

+0.2 1.25 -0.1
2.00.2 1.3
4 3
+6 4 -4
Tape Quantity
0.270.15
Embossed carrier tape 3000pcs TR
The direction is the 1pin of product is at the upper right when you hold
2.10.2
Direction of feed
( reel on the left hand and you pull out the tape on the right hand
1pin
)
0.90.05
1
2
0.05
+0.05 0.13 -0.03 S
1.05Max.
0.050.05
+0.05 0.42 -0.04 0.1 +0.05 0.32 -0.04 S
Direction of feed
(Unit : mm)
Reel
Order quantity needs to be multiple of the minimum quantity.
VSOF5
0.2MAX
1.60.05 1.00.05
5 4

Tape Quantity Direction of feed Embossed carrier tape 3000pcs TR
The direction is the 1pin of product is at the upper right when you hold
(MAX 1.28 include BURR)
1.6 0.05
1.2 0.05
( reel on the left hand and you pull out the tape on the right hand
1pin
)
1
2
3
0.130.05
0.6MAX
0.5
0.220.05
Direction of feed
(Unit : mm)
Reel
Order quantity needs to be multiple of the minimum quantity.
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8/8
2009.06 - Rev.C
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. The Products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products specified in this document are not designed to be radiation tolerant. While ROHM always makes efforts to enhance the quality and reliability of its Products, a Product may fail or malfunction for a variety of reasons. Please be sure to implement in your equipment using the Products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel-controller or other safety device). ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law.
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