1/8 www.rohm.com 2011.03 - rev.d ? 2011 rohm co., ltd. all rights reserved. voltage detector ics low voltage standard cmos voltage detector ics bu48g series, bu48 f series, bu48 fve series, bu49g series, bu49 f series, bu49 fve series 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 rang e 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, b u 4 9 g sop4: bu48 f, b u 4 9 f vsof5: bu48 fve, bu49 fve applications all electronics devices that use microcontrollers and logic circuits. selection guide lineup making detection voltage part number making detection voltage part number making detection voltage part number making detection voltage part number jr 4.8v bu4848 hv 2.8v bu4828 lh 4.8v bu4948 km 2.8v bu4928 jq 4.7v bu4847 hu 2.7v bu4827 lg 4.7v bu4947 kl 2.7v bu4927 jp 4.6v bu4846 ht 2.6v bu4826 lf 4.6v bu4946 kk 2.6v bu4926 jn 4.5v bu4845 hs 2.5v bu4825 le 4.5v bu4945 kj 2.5v bu4925 jm 4.4v bu4844 hr 2.4v bu4824 ld 4.4v bu4944 kh 2.4v bu4924 jl 4.3v bu4843 hq 2.3v bu4823 lc 4.3v bu4943 kg 2.3v bu4923 jk 4.2v bu4842 hp 2.2v bu4822 lb 4.2v bu4942 kf 2.2v bu4922 jj 4.1v bu4841 hn 2.1v bu4821 la 4.1v bu4941 ke 2.1v bu4921 jh 4.0v bu4840 hm 2.0v bu4820 kz 4.0v bu4940 kd 2.0v bu4920 jg 3.9v bu4839 hl 1.9v bu4819 ky 3.9v bu4939 kc 1.9v bu4919 jf 3.8v bu4838 hk 1.8v bu4818 kx 3.8v bu4938 kb 1.8v bu4918 je 3.7v bu4837 hj 1.7v bu4817 kw 3.7v bu4937 ka 1.7v bu4917 jd 3.6v bu4836 hh 1.6v bu4816 kv 3.6v bu4936 jz 1.6v bu4916 jo 3.5v bu4835 hg 1.5v bu4815 ku 3.5v bu4935 jy 1.5v bu4915 jb 3.4v bu4834 hf 1.4v bu4814 kt 3.4v bu4934 jx 1.4v bu4914 ja 3.3v bu4833 he 1.3v bu4813 ks 3.3v bu4933 jw 1.3v bu4913 hz 3.2v bu4832 hd 1.2v bu4812 kr 3.2v bu4932 jv 1.2v bu4912 hy 3.1v bu4831 hc 1.1v bu4811 kq 3.1v bu4931 ju 1.1v bu4911 hx 3.0v bu4830 hb 1.0v bu4810 kp 3.0v bu4930 jt 1.0v BU4910 hw 2.9v bu4829 ha 0.9v bu4809 kn 2.9v bu4929 js 0.9v bu4909 no. specifications description output circuit format 8:open dr ain output, 9:cmos output detection voltage 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) package g:ssop5(smp5c2)/ f :sop4/ fve:vsof5(emp5) no.11006edt01 part number : bu4 1 2 3
technical note 2/8 bu48 g series, bu48 f series, bu48 fve series, bu49 g series, bu49 f series, bu49 fve series www.rohm.com 2011.03 - rev.d ? 2011 rohm co., ltd. all rights reserved. absolute maximum ratings (ta=25 ) paramete r symbol limits unit power supply voltage vdd-gnd -0.3 ~ +7 v output voltage nch open drain output vout gnd-0.3 ~ +7 v cmos output gnd-0.3 ~ vdd+0.3 power dissipation ssop5 *1*4 pd 540 mw sop4 *2*4 400 vsof5 *3*4 210 operating temperature top r -40 ~ +125 ambient storage temperature tstg -55 ~ +125 *1 when used at temperatures higher than ta=25 , the power is reduced by 5.4mw per 1 above 25 . *2 when used at temperatures higher than ta=25 , the power is reduced by 4.0mw per 1 above 25 . *3 when used at temperatures higher than ta=25 , the power is reduced by 2.1mw per 1 above 25 . *4 when a rohm standard circuit board ( 70mm70mm1.6mm, glass epoxy board)is mounted. electrical characteristics parameter symbol condition limit unit min. typ. max. detection voltage v det v dd =h ? l , ta=25 r l =470k ? bu4848 4.752 4.800 4.848 v bu4847 4.653 4.700 4.747 bu4846 4.554 4.600 4.646 bu4845 4.455 4.500 4.545 bu4844 4.356 4.400 4.444 bu4843 4.257 4.300 4.343 bu4842 4.158 4.200 4.242 bu4841 4.059 4.100 4.141 bu4840 3.960 4.000 4.040 bu4839 3.861 3.900 3.939 bu4838 3.762 3.800 3.838 bu4837 3.663 3.700 3.737 bu4836 3.564 3.600 3.636 bu4835 3.465 3.500 3.535 bu4834 3.366 3.400 3.434 bu4833 3.267 3.300 3.333 bu4832 3.168 3.200 3.232 bu4831 3.069 3.100 3.131 bu4830 2.970 3.000 3.030 bu4829 2.871 2.900 2.929 bu4828 2.772 2.800 2.828 bu4827 2.673 2.700 2.727 bu4826 2.574 2.600 2.626 bu4825 2.475 2.500 2.525 bu4824 2.376 2.400 2.424 bu4823 2.277 2.300 2.323 bu4822 2.178 2.200 2.222 bu4821 2.079 2.100 2.121 bu4820 1.980 2.000 2.020 bu4819 1.881 1.900 1.919 bu4818 1.782 1.800 1.818 bu4817 1.683 1.700 1.717 bu4816 1.584 1.600 1.616 bu4815 1.485 1.500 1.515 bu4814 1.386 1.400 1.414 bu4813 1.287 1.300 1.313 bu4812 1.188 1.200 1.212 bu4811 1.089 1.100 1.111 bu4810 0.990 1.000 1.010 bu4809 0.891 0.900 0.909 detection voltage temperature coefficient v det / ? t ta=-40 ~125 *1 - 30 - ppm/ hysteresis voltage ? v det v dd =l ? h ? l ta = - 4 0 ~125 r l =470k ? vdet 1.0v vdet 0.03 vdet 0.05 vdet 0.08 v vdet 1.1v vdet 0.03 vdet 0.05 vdet 0.07 *1 designed guarantee.(outgoing inspection is not done on all products.) * this product is not designed for protection against radioactive rays.
technical note 3/8 bu48 g series, bu48 f series, bu48 fve series, bu49 g series, bu49 f series, bu49 fve series www.rohm.com 2011.03 - rev.d ? 2011 rohm co., ltd. all rights reserved. electrical characteristics (unless otherwise specified ta=-25 to 125 ) parameter symbol condition limit unit min. typ. max. circuit current when on i dd 1 v dd =v det -0.2v v det =0.9-1.3v - 0.15 0.88 a v det =1.4-2.1v - 0.20 1.05 v det =2.2-2.7v - 0.25 1.23 v det =2.8-3.3v - 0.30 1.40 v det =3.4-4.2v - 0.35 1.58 v det =4.3-4.8v - 0.40 1.75 circuit current when off i dd 2 v dd =v det +2.0v v det =0.9-1.3v - 0.30 1.40 a v det =1.4-2.1v - 0.35 1.58 v det =2.2-2.7v - 0.40 1.75 v det =2.8-3.3v - 0.45 1.93 v det =3.4-4.2v - 0.50 2.10 v det =4.3-4.8v - 0.55 2.28 operating voltage range v opl v ol 0.4v, ta=25~125 , r l =470k ? 0.70 - - v v ol 0.4v, ta=-40~25 , r l =470k ? 0.90 - - ?low? output current (nch) i ol v ds =0.05v v dd =0.85v 20 100 - a v ds =0.5v v dd =1.5v v det =1.7-4.8v 1.0 3.3 - ma v ds =0.5v v dd =2.4v v det =2.7-4.8v 3.6 6.5 - ?high? output current (pch) (only bu49 g/f/fve) i oh v ds =0.5v v dd =4.8v v det =0.9-3.9v 1.7 3.4 - ma v ds =0.5v v dd =6.0v v det =4.0-4.8v 2.0 4.0 - output leak current when off (only bu48 g/f/fve) ileak v dd =v ds =7v ta = - 4 0 ~85 - 0 0.1 a v dd =v ds =7v ta = 8 5 ~125 - 0 1 * this product is not designed for protection against radioactive rays. block diagrams bu48g/f/fve bu49 g/f/fve fig.1 fig.2 ssop5 sop4 vsof5 pin no. symbol function pin no. symbol function pin no. symbol function 1 vout reset output 1 vout rese t output 1 vout reset output 2 vdd power supply voltage 2 vdd power supply voltage 2 sub substrate* 3 gnd gnd 3 n.c. unconnected terminal 3 n.c. unconnected terminal 4 n.c. unconnected terminal 4 gnd gnd 4 vdd power supply voltage 5 n.c. unconnected terminal 5 gnd gnd *connect the substrate to v dd vref v out v dd gnd vref v out v dd gnd top view top view top view
technical note 4/8 bu48 g series, bu48 f series, bu48 fve series, bu49 g series, bu49 f series, bu49 fve series www.rohm.com 2011.03 - rev.d ? 2011 rohm co., ltd. all rights reserved. reference data (unless specified otherwise, ta=25 ) fig.3 circuit current 0.0 0.1 0.2 0.3 0.4 0.5 0.6 01 23 45 67 v dd supply voltage v dd [v] circuit current i dd [ a] bu4816f 0 1 2 3 4 5 0.0 0.5 1.0 1.5 2.0 2.5 drain-source voltage v ds [v] "low" output current i ol [ma] v dd =1.2 v bu4816f fig.4 ?low? output current 0 5 10 15 20 25 0123456 drain-source voltage v ds [v] "high" output current i oh [ma] bu4916f v dd =6.0v v dd =4.8v fig.5 ?high? output current 0.0 0.1 0.2 0.3 0.4 0.5 - 40 0 40 80 120 temperature ta[ ] circuit current when on i dd1 [ a] bu4816f fig.9 circuit current when on fig.10 circuit current when off 0.0 0.2 0.4 0.6 0.8 1.0 -40 0 40 80 120 temperature ta[ ] circuit current when off i dd2 [ a] bu4816f 0.0 0.2 0.4 0.6 0.8 1.0 -40 0 40 80 120 temperature ta[ ] minimum operating voltage v opl [v] bu4816f fig.11 operating limit voltage fig.6 i/o characteristics 0 1 2 3 4 5 6 7 01 23 45 67 v dd supply voltage v dd [v] output voltage v out [v] bu4816f 0.0 0.2 0.4 0.6 0.8 1.0 0.0 0.5 1.0 1.5 2.0 2.5 v dd supply voltage v dd [v] output voltage v out [v] bu4816f fig.7 operating limit voltage fig.8 detecting voltage release voltage 1.0 1.5 2.0 - 40 0 40 80 120 temperature ta[ ] detection voltage v det [v] low to hig h(v det + v det ) hig h to low(v det ) bu4816f
technical note 5/8 bu48 g series, bu48 f series, bu48 fve series, bu49 g series, bu49 f series, bu49 fve series www.rohm.com 2011.03 - rev.d ? 2011 rohm co., ltd. all rights reserved. reference data examples of output rising value(t plh )and output falling value(t phl ) part number t plh [s] t phl [s] bu4845g/f/fve 23.3 275.9 bu4945g/f/fve 3.5 354.3 v dd =4.3v ? 5.1v v dd =5.1v ? 4.3v * 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 t he cmos output type(fig.13 ), the detection and release voltages are used as threshold voltages. when the voltage applied to the v dd pins reaches the applicable threshold voltage, the vout terminal voltage switches from either ?high? to ?low ? or from ?low? to ?high?. because the bu48 g/f/fve series uses an open drain output type, it is possible to connect a pull-up resistor to v dd or another power supply [the output ?high? voltage (v out ) in this case becomes v dd or the voltage of the other power supply]. 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 v dd , the ct terminal voltage v ct and the output voltage v out when the input power supply voltage v dd is made to sweep up and sweep down (the circuits are those in fig.12 and 13). when the power supply is tur ned on, the output is unsettled from after over the operating limit voltage (v opl ) until t phl . therefore it is possible that t he reset signal is not outputted when the rise time of vdd is faster than t phl . when v dd is greater than v opl but less than the reset release voltage (v det + v det ), output (v out ) voltages will switch to l. if v dd exceeds the reset release voltage (v det + v det ), then v out switches from l to h (with a delay of t plh ). if v dd drops below the detection voltage (v det ) when the power supply is powered down or when there is a power supply fluctuation, v out switches to l (with a delay of t phl ). the potential deference between the detection voltage and the release voltage is known as the hysteresis width (v det ). the system is designed such that t he output does not flip-flop with power supply fluctuations within this hysteresis width, preventing malfunctions due to noise. q1 vref r1 r2 r3 v out v dd gnd r l v dd reset q2 q1 vref r1 r2 r3 v out v dd gnd reset v dd v det + v det v det v opl 0v t phl v out t plh t phl t plh v ol v oh fig.14
technical note 6/8 bu48 g series, bu48 f series, bu48 fve series, bu49 g series, bu49 f series, bu49 fve series www.rohm.com 2011.03 - rev.d ? 2011 rohm co., ltd. all rights reserved. circuit applications 1) examples of a common power supply detection reset circuit application examples of bu48 g/f/fve series (open drain output type) and bu49 g/f/fve series (cmos output type) are shown below. case1:the power supply of the microcontroller (v dd 2) differs from the power supply of the reset detection (v dd 1). use the open drain output type (bu48 g/fve) attached a load resistance (r l ) between the output and v dd 2. (as shown fig.15) case2:the power supply of the microcontroller (v dd 1) is same as the power supply of the reset detection (v dd 1). use cmos output type (bu43 g/fve) or open drain output type (bu48 g/fve) attached a load resistance (r l ) between the output and v dd 1. (as shown fig.16) 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). 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 t he output logic switches, resulti ng 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. fig.17 v out r2 v dd bu48 bu49 gnd r1 i1 v1 c in c l v dd1 bu48 v dd2 gnd microcontroller r st c l (ca p ac it or f or noise filtering) r l c in c l (capacitor for no is e filterin g) v dd1 bu49 microcontroller r st c in gn d fig.15 open collector output type fig.16 cmos output type
technical note 7/8 bu48 g series, bu48 f series, bu48 fve series, bu49 g series, bu49 f series, bu49 fve series www.rohm.com 2011.03 - rev.d ? 2011 rohm co., ltd. all rights reserved. notes for use 1. absolute maximum range absolute maximum ratings are those values beyond whic h 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 vo ltage potential every state. please make sure all pins that are over ground even if includ e transient feature. 3 electrical characteristics be sure to check the electrical charac teristics that are one the t entative 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 v dd pin and gnd with 1uf over and between v out pin and gnd with 1000pf. if extremely big capacitor is used, transient respons e might be late. please confirm sufficiently for the point. 5. short circuit between terminal and soldering don?t short-circuit between output pin and v dd pin, output pin and gnd pin, or v dd pin and gnd pin. when soldering the ic on circuit board please is unusually cautious about the orientation and the pos ition 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. the vdd line inpedance might cause o scillation because of the detection current. 8. a vdd -gnd capacitor (as close connection as possibl e) should be used in high vdd line impedance condition. 9. 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 uncl eanness of pcb surface might cause unexpected operations. applicat ion 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 as sumed 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 co nfirm using practical applications. 13. power on reset operation please note that the power on reset output varies with th e vcc rise up time. please veri fy the actual operation. 14. precautions for board inspection connecting low-impedance capacitors to run inspections with the board may produce st ress on the ic. therefore, be certain to use proper discharge procedure before each proc ess of the test operation.to prevent electrostatic accumulation and discharge in the assembly process, thor oughly 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 case s, momentary rash-current flow into the ic at the logic unsettled, the couple capacitance, gnd pattern of width and leading line must be considered.
technical note 8/8 bu48 g series, bu48 f series, bu48 fve series, bu49 g series, bu49 f series, bu49 fve series www.rohm.com 2011.03 - rev.d ? 2011 rohm co., ltd. all rights reserved. ordering part number b u 4 8 0 9 f t r bu48: standard cmos reset ic detection voltage 09 : 0.9v (0.1v step) 48 : 4.8v package g: ssop5 f: sop4 fve: vsof5 packaging and forming specification tr: embossed tape and reel open drain type bu49: standard cmos reset ic cmos output type (unit : mm) ssop5 2.90.2 0.13 4 + 6 ?4 1.6 2.80.2 1.10.05 0.050.05 +0.2 ?0.1 +0.05 ?0.03 0.42 +0.05 ?0.04 0.95 5 4 12 3 1.25max. 0.2min. 0.1 direction of feed reel ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tape quantity direction of feed the direction is the 1pin of product is at the upper right when you hold reel on the left hand and you pull out the tape on the right hand 3000pcs tr () 1pin (unit : mm) vsof5 1.2 0.05 4 3 1.0 0.05 1 0.6max 0.22 0.05 0.5 5 1.6 0.05 0.13 0.05 0.2max 2 1.6 0.05 (max 1.28 include burr) direction of feed reel ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tape quantity direction of feed the direction is the 1pin of product is at the upper right when you hold reel on the left hand and you pull out the tape on the right hand 3000pcs tr () 1pin (unit : mm) sop4 2.1 0.2 0.05 1.3 2.0 0.2 12 43 1.25 +0.2 ?0.1 4 +6 0.27 0.15 ?4 0.13 +0.05 ?0.03 0.90.05 0.05 0.05 1.05max. 0.32 +0.05 ?0.04 0.42 +0.05 ?0.04 s 0.1 s direction of feed reel ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tape quantity direction of feed the direction is the 1pin of product is at the upper right when you hold reel on the left hand and you pull out the tape on the right hand 3000pcs tr () 1pin
r1120 a www.rohm.com ? 2011 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specied herein is subject to change for improvement without notice. the content specied 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 specications, 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 specied 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 specied herein is intended only to show the typical functions of and examples of application circuits for the produc ts. 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 specied in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, ofce-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specied 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, re or any other damage caused in the event of the failure of any product, such as derating, redundancy, re 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 specied 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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