description the accutek ak536512w high density memory module is a cmos dynamic ram organized in 512k x 36 bit words. the module con - sists of sixteen standard 256 k x 4 drams in plastic soj packages and eight 256k x 1 drams in plcc packages. the assembly has 12 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 ak536512 is identical to sixteen 256 k x 4 plus eight 256 k x 1 drams. there are four cas lines and four ras lines. on each bank of 256k x 36, independent byte control is ac - complished by four cas lines. each separate cas line controls four 256k x 4 drams and two 256k x 1 drams with data in tied to data out to for m a 9 bit byte. two banks of 36 bits are controlled by the two pairs of ras lines. an eighteen bit data path can be pro - duced by connecting dq 0 to dq 18 ,dq 1 to dq 19 , etc. and alter - nately strobing ras 0 with ras 1 and ras 2 with ras 3 . features 524,288 x 36 bit organization 72 pad single in-line module multiple cas and ras lines allow x18 or x36 bit widths cas -before-ras refresh operating free air temperature 0 o cto70 o c single 5 volt power supply power 5.41 watt max active (70ns) 4.75 watt max active (80 ns) 4.09 watt max active (100 ns) 132 mw max standby 512 refresh cycles, 8 msec available in fast page mode and static column mode ver- sions downward compatible with ak536256w upward compatible with AK5361024W, ak5362048w, ak5364096w and ak5368192w accutek microcircuit corporation ak536512w 524,288 word by 36 bit cmos dynamic random access memory + + pin nomenclature dq 0 -dq 35 data in/data out a 0 -a 8 address inputs cas 0 - cas 3 column address strobe ras 0 - ras 3 row address strobe we write enable pd presence detect vcc 5v supply vss ground nc no connect module options leadless sim: ak536512w leaded zip: ak536512z pin assignment pin # symbol pin # symbol pin # symbol pin # symbol 1 vss 19 nc 37 dq17 55 dq12 2 dq0 20 dq4 38 dq35 56 dq30 3 dq18 21 dq22 39 vss 57 dq13 4 dq1 22 dq5 40 cas 0 58 dq31 5 dq19 23 dq23 41 cas 2 59 vcc 6 dq2 24 dq6 42 cas 3 60 dq32 7 dq20 25 dq24 43 cas 1 61 dq14 8 dq3 26 dq7 44 ras 0 62 dq33 9 dq21 27 dq25 45 ras 1 63 dq15 10 vcc 28 a7 46 nc 64 dq34 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 dq27 68 pd2 15 a3 33 ras 3 51 dq10 69 pd3 16 a4 34 ras 2 52 dq28 70 pd4 17 a5 35 dq26 53 dq11 71 nc 18 a6 36 dq8 54 dq29 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 e-mail: sales@accutekmicro.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. c l c l c l + + 4.240" 4.260" 1.000" max 0.330" max 0.425" 0.375" 0.250" c l 0.080" 3.979" 3.989" 0.125" 0.050" typ
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