description the accutek ak532512w high density memory module is a cmos dynamic ram organized in 512k x 32 bit words. the module con - sists of sixteen standard 256 k x 4 drams in plastic soj packages. the assembly has eight drams mounted on each side of a printed circuit board in a 72 pad leadless sim configuration. this configuration allows socket-mounting of large quantities of memory in applications where high density and ease of inserting ad - ditional memory are important. the operation of the ak532512w is identical to sixteen 256k x 4 drams. there are four cas lines and four ras lines. on each bank of 256k x 32, independent byte control is accomplished by the four cas lines. each seperate cas line controls four 256 k x 4 drams. two banks of 32 bits are controlled by the two pairs of ras lines. a sixteen bit data path can be produced by connecting dq 1 to dq 17 , dq 2 to dq 18 and alternately strobing ras 0 with ras 1 and ras 2 with ras 3 . features 524,288 x 32 bit organization 72 pin single in-line module multiple cas and ras lines allow x16 or x32 bit widths cas -before- ras refresh, ras -only refresh or hidden refresh operating free air temperature 0 o cto70 o c single 5 volt power supply 512 refresh cycles, 8msec available in fast page mode and edo power 4.00 watt max active (60ns) 3.56 watt max active (70 ns) 3.124 watt max active (80 ns) 88 mw max standby available in leadless sim or leaded zip versions downward compatible with ak532256 upward compatible with ak5321024, ak5322048, ak5324096 and ak5328192 additional options available 256k x 32 version, ak532256 1 meg x 32 version, ak5321024 2 meg x 32 version, ak5322048 4 meg x 32 version, ak5324096 8 meg x 32 version, ak5328192 accutek microcircuit corporation ak532512w 524,288 word by 32 bit cmos dynamic random access memory 72 1 pin nomenclature a 0 -a 8 address inputs dq 1 -dq 32 data in/data out cas 0 - cas 3 column address strobe ras 0 - ras 3 row address strobe we write enable pd 1 -pd 4 presence detect vcc 5v supply vss ground nc no connect module options leadless sim: ak532512w leaded zip: ak532512z pin assignment pin # symbol pin # symbol pin # symbol pin # symbol 1 vss 19 nc 37 nc 55 dq12 2 d1 20 dq5 38 nc 56 dq28 3 dq17 21 dq21 39 vss 57 dq13 4 dq2 22 dq6 40 cas 0 58 dq29 5 dq18 23 dq22 41 cas 2 59 vcc 6 dq3 24 dq7 42 cas 3 60 dq30 7 dq19 25 dq23 43 cas 1 61 dq14 8 dq4 26 dq8 44 ras 0 62 dq31 9 dq20 27 dq24 45 ras 1 63 dq15 10 vcc 28 a7 46 nc 64 dq32 11 nc 29 nc 47 we 65 dq16 12 a0 30 vcc 48 nc 66 nc 13 a1 31 a8 49 dq9 67 pd1 14 a2 32 nc 50 dq25 68 pd2 15 a3 33 ras 3 51 dq10 69 pd3 16 a4 34 ras 2 52 dq26 70 pd4 17 a5 35 nc 53 dq11 71 nc 18 a6 36 nc 54 dq27 72 vss presence detect - -60 -70 -80 pd1 nc nc nc pd2 vss vss vss pd3 nc vss nc pd4 nc nc vss
functional diagram mechanical dimensions accutek microcircuit corporation business center at newburyport 2 new pasture road, suite 1 newburyport, ma 01950-4054 phone: 978-465-6200 fax: 978-462-3396 email: accutek@seacoast.com internet: www.accutekmicro.com accutek reserves the right to make changes in specifications at any time and without notice. accutek does not assume any responsibility for the use of any circuitry described; no circuit patent licenses are implied. preliminary data sheets contain minimum and maximum limits based upon design objectives, which are subject to change upon full characterization over the specific operating conditions. 72 1 c l c l c l 1.000" max 0.330" max 0.425" 0.375" 0.250" c l 0.080" 0.125" 0.050" typ 4.250" 3.985"
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