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| 1/10 www.rohm.com 2009.06 - rev.b ? 2009 rohm co., ltd. all rights reserved. voltage detector ic series low voltage free delay time setting cmos voltage detector ic series bu42 g, b u 4 2 f, b u 4 2 fve, bu43 g, b u 4 3 f, b u 4 3 fve series ? description rohm cmos reset ic series with adjustable output delay is a high-accuracy low current consumption reset ic series with a built-in delay circuit. the lineup was established with two output types (nch open drain and cmos output) and detection voltages range from 0.9v to 4.8v in incr ements 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 (bu42 g/f/fve)and cmos output (bu43 g/f/fve) 5) small surface package ssop5: bu42 g bu43 g sop4: bu42 f bu43f vsof5: bu42 fve bu43 fve ? applications all electronics devices that use microcontrollers and logic circuits. ? selection guide ? lineup makin g detectio n voltage part number makin g detectio n voltage part number makin g detectio n voltage part number makin g detectio n voltage part number zr 4.8v bu4248 yv 2.8v bu4228 1h 4.8v bu4348 0m 2.8v bu4328 zq 4.7v bu4247 yu 2.7v bu4227 1g 4.7v bu4347 0l 2.7v bu4327 zp 4.6v bu4246 yt 2.6v bu4226 1f 4.6v bu4346 0k 2.6v bu4326 zn 4.5v bu4245 ys 2.5v bu4225 1e 4.5v bu4345 0j 2.5v bu4325 zm 4.4v bu4244 yr 2.4v bu4224 1d 4.4v bu4344 0h 2.4v bu4324 zl 4.3v bu4243 yq 2.3v bu4223 1c 4.3v bu4343 0g 2.3v bu4323 zk 4.2v bu4242 yp 2.2v bu4222 1b 4.2v bu4342 0f 2.2v bu4322 zj 4.1v bu4241 yn 2.1v bu4221 1a 4.1v bu4341 0e 2.1v bu4321 zh 4.0v bu4240 ym 2.0v bu4220 0z 4.0v bu4340 0d 2.0v bu4320 zg 3.9v bu4239 yl 1.9v bu4219 0y 3.9v bu4339 0c 1.9v bu4319 zf 3.8v bu4238 yk 1.8v bu4218 0x 3.8v bu4338 0b 1.8v bu4318 ze 3.7v bu4237 yj 1.7v bu4217 0w 3.7v bu4337 0a 1.7v bu4317 zd 3.6v bu4236 yh 1.6v bu4216 0v 3.6v bu4336 zz 1.6v bu4316 zc 3.5v bu4235 yg 1.5v bu4215 0u 3.5v bu4335 zy 1.5v bu4315 zb 3.4v bu4234 yf 1.4v bu4214 0t 3.4v bu4334 zx 1.4v bu4314 za 3.3v bu4233 ye 1.3v bu4213 0s 3.3v bu4333 zw 1.3v bu4313 yz 3.2v bu4232 yd 1.2v bu4212 0r 3.2v bu4332 zv 1.2v bu4312 yy 3.1v bu4231 yc 1.1v bu4211 0q 3.1v bu4331 zu 1.1v bu4311 yx 3.0v bu4230 yb 1.0v bu4210 0p 3.0v bu4330 zt 1.0v bu4310 yw 2.9v bu4229 ya 0.9v bu4209 0n 2.9v bu4329 zs 0.9v bu4309 no. specifications description 1 output circuit format 2:open dr ain output, 3:cmos output 2 detection voltage example v det : represented as 0.1v steps in the range from 0.9v to 4.8v (displayed as 0.9 in the case of 0.9v) 3 package g:ssop5(smp5c2)/ f :sop4/ fve:vsof5(emp5) no.09006ebt02 part number : bu4 1 2 3
technical note 2/10 bu42 g, b u 4 2 f, b u 4 2 fve, bu43 g, b u 4 3 f, b u 4 3 fve series www.rohm.com 2009.06 - rev.b ? 2009 rohm co., ltd. all rights reserved. ? absolute maximum ratings (ta=25c) parameter 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 topr -40 ~ +125 c ambient storage temperature tstg -55 ~ +125 c *1 when used at temperatures higher than ta =25c, the power is reduced by 5.4mw per 1c above 25c. *2 when used at temperatures higher than ta=25 c, the power is reduced by 4.0mw per 1c above 25c. *3 when used at temperatures higher than ta =25c, the power is reduced by 2.1mw per 1c above 25c. *4 when a rohm standard circuit board ( 70mm70mm1.6mm, glass epoxy board)is mounted. ? electrical characteristics (unless othe rwise specified ta=-40 to 105c) parameter symbol condition limit unit min. typ. max. detection voltage v det v dd =h ? ? ? ? ? ? ? ? ? ? ? ? technical note 3/10 bu42 g, b u 4 2 f, b u 4 2 fve, bu43 g, b u 4 3 f, b u 4 3 fve series www.rohm.com 2009.06 - rev.b ? 2009 rohm co., ltd. all rights reserved. ? block diagrams bu42 technical note 4/10 bu42 g, b u 4 2 f, b u 4 2 fve, bu43 g, b u 4 3 f, b u 4 3 fve series www.rohm.com 2009.06 - rev.b ? 2009 rohm co., ltd. all rights reserved. ? reference data (unless specified otherwise, ta=25c) 0.0 0.5 1.0 - 40 0 40 80 120 temperature technical note 5/10 bu42 g, b u 4 2 f, b u 4 2 fve, bu43 g, b u 4 3 f, b u 4 3 fve series www.rohm.com 2009.06 - rev.b ? 2009 rohm co., ltd. all rights reserved. ? setting of detector delay time this detector ic can be set delay time at the rise of v dd by the capacitor connected to ct terminal. delay time at the rise of v dd t plh :time until when vout rise to 1/2 of v dd after v dd rise up and beyond the release voltage(v det + ? ? reference data of falling time (t phl ) output examples of falling time (t phl ) output part number t phl [s] bu4245g 275.7 bu4345g 359.3 *this data is for reference only. the figures will vary with the application, so pl ease confirm actual operating conditions before use. ? explanation of operation for both the open drain type(fig.15)and t he cmos output type(fig.16 ), 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?. bu42 ? ? 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.15 and 16). ? v dd -v cth v dd technical note 6/10 bu42 g, b u 4 2 f, b u 4 2 fve, bu43 g, b u 4 3 f, b u 4 3 fve series www.rohm.com 2009.06 - rev.b ? 2009 rohm co., ltd. all rights reserved. ? circuit applications 1) examples of a common power supply detection reset circuit application examples of bu42 technical note 7/10 bu42 g, b u 4 2 f, b u 4 2 fve, bu43 g, b u 4 3 f, b u 4 3 fve series www.rohm.com 2009.06 - rev.b ? 2009 rohm co., ltd. all rights reserved. 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 moment arily flows from the power supply (vdd) to ground (gnd) when the output level switches from ?high? to ?low? or vice versa.) fig.20 a voltage drop of [the through-current (i1)] [input resistor (r2)] is caused by the through current, and the input voltage to descends, when the output switches from ?low? to ?high?. when the input voltage decreases and falls below the detection voltage, the output voltage switc hes from ?high? to ?low?. at this time, t he through-current stops flowing through output ?low?, and the voltage drop is eliminated. as a result, the out put switches from ?low? to ?high?, which again causes the through current to flow and the voltage drop. this process is repeated, resulting in oscillation. consider the use of bu42 vdd - idd peak current ta=25 c 0.001 0.01 0.1 1 10 345678910 vdd[v] idd-peak[ma] bu43xx bu42xx bd52xx bd53xx temp - idd(bu42xx) 0.0 0.5 1.0 1.5 2.0 2.5 -50 -30 -10 10 30 50 70 90 110 130 temp idd peak current[ma] vdd3v vdd6v vdd7v vdd4v technical note 8/10 bu42 g, b u 4 2 f, b u 4 2 fve, bu43 g, b u 4 3 f, b u 4 3 fve series www.rohm.com 2009.06 - rev.b ? 2009 rohm co., ltd. all rights reserved. ? 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 ph ysical security countermeasure, like fuse, is to be given when a specific mode to be beyond absol ute 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 characteristics, that are one the tentative specif ication 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 response mi ght 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 ca utious about the orientatio n 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 . the v dd line inpedance might cause oscillation because of the detection current. 8. a v dd -gnd capacitor (as close connection as possible) should be used in high v dd line impedance condition. 9 . lower than the mininum input voltage makes the v out high impedance, and it must be v dd in pull up (v dd ) condition. 10. case of needless delay time , recommended to insert more 470k ? ? ? ? ? technical note 9/10 bu42 g, b u 4 2 f, b u 4 2 fve, bu43 g, b u 4 3 f, b u 4 3 fve series www.rohm.com 2009.06 - rev.b ? 2009 rohm co., ltd. all rights reserved. 13. delay time (tplh) tplh = ? ? ? technical note 10/10 bu42 g, b u 4 2 f, b u 4 2 fve, bu43 g, b u 4 3 f, b u 4 3 fve series www.rohm.com 2009.06 - rev.b ? 2009 rohm co., ltd. all rights reserved. ? part number selection b u 4 2 0 9 g (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. r0039 a www.rohm.com ? 2009 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 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, commu- nication 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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