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| 1/16 www.rohm.com 2011.01 - rev. a ? 2011 rohm co., ltd. all rights reserved. high reliability serial eeproms microwire bus br93 family bu9888fv-w description bu9888fv-w is a serial eeprom of serial 3-line interface method. features 1) 256word16bits architecture 4k bit serial eeprom 2) operating voltage range(3.0 3.6v) 3) address auto increment function at read action 4) write mistake prevention function write prohibition at power on write prohibition by command code write mistake prevention function at low voltage 5) program cycle auto delete and auto end function 6) program condition display ready / busy 7) low current consumption at write action(3.6v): icc1 = 3.5ma(max.) at read action(3.6v): icc2 = 2.0ma(max.) at standby action (3.6v) : isb = 2.0 a(max.) 8) compact package ssop-b8pin 9) data retention for 40 years 10) data rewrite up to 100,000 times 11) data at shipment all addresses ffffh absolute maximum rating (ta=25 ) parameter symbol ratings unit supply voltage vcc -0.3 +6.5 v power dissipation pd 300 *1 mw storage temperature tstg -65 +125 operating temper ature topr -20 +85 terminal voltage -0.3 vcc+0.3 *2 v *1 degradation is done at 3.0mw/ for operation above 25 *2 the max value of terminal voltage is not over 6.5v eeprom recommended op erating condition parameter symbol ratings unit supply voltage vcc 3.0 3.6 v input voltage vin 0 vcc memory cell characteristics (ta=25 , vcc = 3.0 3.6v) parameter limits unit min. typ. max. erase/write cycle *1 100,000 cycles data retention *1 40 years *1 not 100 tested no.11001eat20
technical note 2/16 bu9888fv-w www.rohm.com 2011.01 - rev. a ? 2011 rohm co., ltd. all rights reserved. technical note 3/16 bu9888fv-w www.rohm.com 2011.01 - rev. a ? 2011 rohm co., ltd. all rights reserved. 0 0.5 1 1.5 2 2.5 0123456 supply voltage : vcc(v) standby current : i sb (ua) spec ta=-40 ta=25 ta=85 0 0.2 0.4 0.6 0.8 1 1.2 0123456 supply voltage : vcc(v) input leak current : i li (ua) spec ta=-40 ta=25 ta=85 0.1 1 10 100 1000 10000 0123456 supply voltage : vcc(v) sk freq uency : fskmhz spec ta=-40 ta=25 ta=85 0 0.2 0.4 0.6 0.8 1 0123456 supply voltage : vcc(v) h sk time : t skh ( s) spec ta=-40 ta=25 ta=85 0 1 2 3 4 5 0 0.4 0.8 1.2 1.6 h output current : i oh (ma) h output voltage : v oh (v) spec ta=-40 ta=25 ta=85 0 0.2 0.4 0.6 0.8 1 1.2 0123456 supply voltage : vcc(v) output leak current : i lo (ua) spec ta=-40 ta=25 ta=85 0 1 2 3 4 5 0123456 supply voltage : vcc(v) current consumption at w riting : icc1(ma) spec ta=-40 ta=25 ta=85 0 1 2 3 4 5 6 0123456 supply voltage : vcc(v) h input voltage : v ih (v) ta=-40 ta=25 ta=85 spec 0 0.2 0.4 0.6 0.8 1 012345 l output current : i ol (ma) l output voltage : v ol (v) spec ta=-40 ta=25 ta=85 0 1 2 3 4 5 6 0123456 supply voltage : vcc(v) l input voltage : v il (v) ta=-40 ta=25 ta = 85 input leak current output leak current current consumption at write action consumption current at standby action 0 0.2 0.4 0.6 0.8 1 0123456 supply voltage : vccv l sk time : t skl ( s) spec ta=-40 ta=25 ta=85 low time spec 0 0.5 1 1.5 2 2.5 3 0123456 supply voltage : vcc(v) current consumption at reading : icc2(ma) ta=-40 ta=25 ta=85 spec consumption current at read action voltage technical note 4/16 bu9888fv-w www.rohm.com 2011.01 - rev. a ? 2011 rohm co., ltd. all rights reserved. 0 0.2 0.4 0.6 0.8 1 0123456 supply voltage : vcc(v) data '1' output delay time : t pd1 ( s) ta=-40 ta=25 ta=85 spec 0 50 100 150 200 250 0123456 supply voltage : vcc(v) time between cs and output high-z : t df (ns) spec ta=-40 ta=25 ta=85 -200 -100 0 100 200 300 0123456 supply voltage : vcc(v) cs set up tim e : t css (ns) ta=-40 ta=25 ta=85 spec -50 0 50 100 150 0123456 supply voltage : vcc(v) di hold time : t dih (ns) spec ta=-40 ta=25 ta=85 0 0.2 0.4 0.6 0.8 1 1.2 0123456 supply voltage : vcc(v) l cs time : t cs ( s) spec ta=-40 ta=25 ta=85 loe time cs setup time di hold time di setup time data 0 0.2 0.4 0.6 0.8 1 0123456 supply voltage : vcc(v) time between cs and o utput : t sv ( s) spec ta=-40 ta=25 ta=85 time from -50 0 50 100 150 0123456 supply voltage : vcc(v) di set up time : t dis (ns) ta=-40 ta=25 ta=85 spec 0 0.2 0.4 0.6 0.8 1 0123456 supply voltage : vcc(v) data '0' o utput delay time : t pd0 ( s) ta=-40 ta=25 ta=85 spec 0 1 2 3 4 5 0123456 supply voltage : vcc(v) write cycle time : t e/w (m s) spec ta=-40 ta=25 ta=85 write cycle time technical note 5/16 bu9888fv-w www.rohm.com 2011.01 - rev. a ? 2011 rohm co., ltd. all rights reserved. ? ? technical note 6/16 bu9888fv-w www.rohm.com 2011.01 - rev. a ? 2011 rohm co., ltd. all rights reserved. 1 2 high-z 0 a0 28 d0 27 d15 12 d14 d15 d14 d1 a1 0 12 4 1 1 a7 a6 cs sk di do mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj tcs high-z ready busy te/w cs sk di do 12 4 11 a1 a0 0 status 12 27 d0d1 d15 d14 1a7a6 1 tsv mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj mj technical note 7/16 bu9888fv-w www.rohm.com 2011.01 - rev. a ? 2011 rohm co., ltd. all rights reserved. 3. write enable (wen) high-z 1 10 1 0 cs sk di 12345 do 10 11 6789 high-z do 0 0 cs sk di 12345 0 10 10 11 6789 technical note 8/16 bu9888fv-w www.rohm.com 2011.01 - rev. a ? 2011 rohm co., ltd. all rights reserved. ? ? technical note 9/16 bu9888fv-w www.rohm.com 2011.01 - rev. a ? 2011 rohm co., ltd. all rights reserved. 3) equivalent circuit 4) i/o peripheral circuit 4-1) pull down cs. by making cs=?l? at power on/off, mistake in operation and mistake write are prevented. R ??? R R ??? R ? ? ? technical note 10/16 bu9888fv-w www.rohm.com 2011.01 - rev. a ? 2011 rohm co., ltd. all rights reserved. 4-2) do is available in both pull up and pull down. do output become ?high-z? in other ready / busy output timing than after data output at read command and write command. when malfunction occurs at ?high-z? input of the microcontroller port connected to do, it is necessary to pull down and pull up do. when there is no influence upon the microcontroller actions, do may be open. if do is open, and at timing to output st atus ready, at timing of cs=?h?, sk= ?h?, di=?h?, eeprom recognizes this as a start bit, resets ready output, and do=?high-z?, ther efore, ready signal cannot be detected. to avoid such output, pull up do pin for improvement. fig.38 ready output timing at do=open R ??? R Q ??? R , ? ? ? R ??? R R ??? R , ? ? ? technical note 11/16 bu9888fv-w www.rohm.com 2011.01 - rev. a ? 2011 rohm co., ltd. all rights reserved. 5) ready / busy status display (do terminal) (common to br93l46-w / a46-wm,br93l56-w / a56-wm, br93l66-w / a66-wm, br93l76-w / a76-wm, br93l86-w / a86-wm) this display outputs the internal status si gnal. when cs is started after tcs (min.200ns) from cs fall after write command input, ?h? or ?l? is output. b/r display =?l? ( busy ) = write under execution after the timer circuit in the ic works and creates the per iod of te/w, this time circ uit completes au tomatically. and write to the memory cell is made in the period of te /w, and during this period, other command is not accepted. b/r display = ?h? (ready) = command wait status even after te/w (max.5ms) from write of the me mory cell, the following command is accepted. therefore, cs=?h? in the period of te/w, and when input is in sk, di, malfunction may occur, therefore, di=?l? in the area cs=?h?. (especially, in the case of shared input port, attention is required.) * do not input any command while status signal is output. command input in busy area is cancelled, but command input in ready area is accepted. therefore, status ready output is cancelled, and malfunction and mistake write may be made. cs high-z sk di do clock write instruction ready busy status technical note 12/16 bu9888fv-w www.rohm.com 2011.01 - rev. a ? 2011 rohm co., ltd. all rights reserved. 6) when to directly connect di and do this ic has independent input terminal di and output terminal do, and separate signals are handled on timing chart, meanwhile, by inserting a resistance r between these di and do terminals, it is possible to carry out control by 1 control line. n? :w n? :w n? :w n? :w n? :w n? :w n? :w n? :w n? :w n? :w n? :w n? :w n? :w n? :w n? :w n? :w n? :w n? :w n? :w n? :w high-z write command write command write command write command microcontroller input microcontroller output fig.44 collision timing at di, do direct connection cs sk di do technical note 13/16 bu9888fv-w www.rohm.com 2011.01 - rev. a ? 2011 rohm co., ltd. all rights reserved. ? ? ? Q Q Q R ??? R R R ??? R R R ? ??? R R R ? ??? R ? ? ? ? ? ? ? ? ? technical note 14/16 bu9888fv-w www.rohm.com 2011.01 - rev. a ? 2011 rohm co., ltd. all rights reserved. 7) notes on power on/off ? technical note 15/16 bu9888fv-w www.rohm.com 2011.01 - rev. a ? 2011 rohm co., ltd. all rights reserved. technical note 16/16 bu9888fv-w www.rohm.com 2011.01 - rev. a ? 2011 rohm co., ltd. all rights reserved. ? order quantity needs to be multiple of the minimum quantity. 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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