1 white electronic designs corporation ? (508) 366-5151 ?www.whiteedc.com WED8L24257V march 2000 rev. 1 eco #12474 fig. 1 pin names block diagram pin symbols pin configuration asynchronous sram, 3.3v, 256kx24 features 256kx24 bit cmos static random access memory array ? fast access times: 10, 12, and 15ns ? master output enable and write control ? ttl compatible inputs and outputs ? fully static, no clocks surface mount package ? 119 lead bga (jedec mo-163), no. 391 ? small footprint, 14mmx22mm ? multiple ground pins for maximum noise immunity single +3.3v ( 5%) supply operation dsp memory solution ? motorola dsp5630x ? analog devices sharc tm description the WED8L24257Vxxbc is a 3.3v, twelve megabit sram con- structed with three 256kx8 die mounted on a multi-layer laminate substrate. with 10 to 15ns access times, x24 width and a 3.3v operating voltage, the WED8L24257V is ideal for creating a single chip memory solution for the motorola dsp5630x (figure 8) or a two chip solution for the analog devices sharc tm dsp (figure 9). the single or dual chip memory solutions offer improved system performance by reducing the length of board traces and the number of board connections compared to using multiple monolithic devices. the jedec standard 119 lead bga provides a 69% space savings over using six 256kx4, 300 mil wide sojs and the bga package has a maximum height of 110 mils compared to 148 mils for the soj packages. the bga package also allows the use of the same manufacturing and inspection techniques as the motorola dsp, which is also in a bga package. a 0-17 address inputs e chip enable w master write enable g master output enable dq 0-23 common data input/output vcc power (3.3v 5%) gnd ground nc no connection 12 3 45 67 anc ao a1 a2 a3 a4 nc b n c a5 a6 e a7 a8 n c c i/012 nc nc nc nc nc i/00 d i/013 vcc gnd gnd gnd vcc i/01 e i/014 gnd vcc gnd vcc gnd i/02 f i/015 vcc gnd gnd gnd vcc i/03 g i/016 gnd vcc gnd vcc gnd i/04 h i/017 vcc gnd gnd gnd vcc i/05 j n c gnd vcc gnd vcc gnd n c k i/018 vcc gnd gnd gnd vcc i/06 l i/019 gnd vcc gnd vcc gnd i/07 m i/020 vcc gnd gnd gnd vcc i/08 n i/021 gnd vcc gnd vcc gnd i/09 p i/022 vcc gnd gnd gnd vcc i/010 r i/023 nc nc nc nc a17 i/011 t n c a9 a10w a11 a12 n c u n c a13 a14 g a15 a16 n c 256k x 24 memory array 18 a 0 -a 17 g w e dq 0 - 7 dq 8-15 dq 16-23
2 white electronic designs corporation ? (508) 366-5151 ?www.whiteedc.com WED8L24257V march 2000 rev. 1 *stress greater than those listed under "absolute maximum ratings" may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions greater than those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. note: for t ehqz , t ghqz and t wlqz see figure 3. absolute maximum ratings ac test conditions recommended dc operating conditions voltage on any pin relative to vss -0.5v to 4.6v operating temperature ta (ambient) commercial 0 c to + 70 c industrial -40 c to +85 c storage temperature -55 c to +125 c power dissipation 1.5 watts output current 50 ma parameter sym min typ max units supply voltage vcc 3.135 3.3 3.465 v supply voltage vss 0 0 0 v input high voltage vih 2.2 -- vcc+0.3 v input low voltage vil -0.3 -- 0.8 v fig. 2 fig. 3 (f=1.0mhz, vin=vcc or vss) these parameters are sampled, not 100% tested. dc electrical characteristics truth table capacitance 353 ? 5 pf d out 319 ? vcc r l = 50 ? v l = 1.5v q z0 = 50 ? z 0 = 50 ? 65 pf input pulse levels vss to 3.0v input rise and fall times 5ns input and output timing levels 1.5v output load figure 2 parameter sym conditions min max units 10ns 12-15ns operating power supply current icc1 w = vil, ii/o = 0ma, 500 480 ma min cycle standby (ttl) supply current icc2 e > vih, vin < vil or 150 150 ma vin > vih, f= mhz full standby cmos icc3 e > vcc-0.2v 90 90 ma supply current vin > vcc-0.2v or vin < 0.2v input leakage current ili vin = 0v to vcc 10 10 a output leakage current ilo v i/o = 0v to vcc 10 10 a output high volltage voh ioh = -4.0ma 2.4 v output low voltage vol iol = 4.0ma 0.4 0.4 v parameter sym max unit address lines ca 8 pf data lines cd/q 10 pf write & output enable lines w, g 8 pf chip enable lines e -e2 8 pf g e w mode output power x h x standby high z icc2,icc3 h l h output deselect high z icc1 l l h read d out icc1 x l l write d in icc1
3 white electronic designs corporation ? (508) 366-5151 ?www.whiteedc.com WED8L24257V march 2000 rev. 1 ac characteristics read cycle symbol 10ns 12ns 15ns parameter jedecalt. min max min max min max units read cycle time t avav t rc 1012 15 ns address access time t avqv t aa 1012 15 ns chip enable access time t elqv t acs 1012 15 ns chip enable to output in low z (1) t elqx t clz 33 3ns chip disable to output in high z (1) t ehqz t chz 567ns output hold from address change t avqx t oh 33 3ns output enable to output valid t glqv t oe 567ns output enable to output in low z (1) t glqx t olz 00 0ns output disable to output in high z(1) t ghqz t ohz 567ns fig. 4 read cycle 1 - w high, g, e low fig. 5 read cycle 2 - w high a q t avqv t elqv t glqv t elqx t glqx t avav t ehqz t ghqz g e note 1: parameter is guaranteed, but not tested. a q t avqx t avqv t avav data 2 address 1 address 2 data 1
4 white electronic designs corporation ? (508) 366-5151 ?www.whiteedc.com WED8L24257V march 2000 rev. 1 note 1: parameter is guaranteed, but not tested. ac characteristics write cycle fig. 6 write cycle 1 - w controlled a d t avwh t elwh t whax t wlwh t dvwh t wlqz t whqx t avwl t whdx t avav data valid high z w e q symbol 10ns 12ns 15ns parameter jedecalt. min max min max min max units write cycle time t avav t wc 1012 15 ns chip enable to end of write t elwh t cw 899ns t eleh t cw 899ns address setup time t avwl t as 000ns t avel t as 000ns address valid to end of write t avwh t aw 8910ns t aveh t aw 8910ns write pulse width t wlwh t wp 81011ns t wleh t wp 81011ns write recovery time t whax t wr 000ns t ehax t wr 000ns data hold time t whdx t dh 000ns t ehdx t dh 000ns write to output in high z (1) t wlqz t whz 050607ns data to write time t dvwh t dw 667ns t dveh t dw 667ns output active from end of write (1) t whqx t wlz 333ns
5 white electronic designs corporation ? (508) 366-5151 ?www.whiteedc.com WED8L24257V march 2000 rev. 1 fig. 7 write cycle 2 - e controlled commercial (0 c to +70 c) industrial (-40 c to +85 c) ordering information package no. 391 119 lead bga jedec mo-163 a d t aveh t eleh t ehax t dveh t ehdx t avav data valid high z w t wleh e q t avel 0.110 max 0.711 (0.028) max 1.27 (0.050) typ 1.27 (0.050) typ a b c d e f g h j k l m n p r t u 14.00 (0.551) typ a1 corner 20.32 (0.800) typ 22.00 (0.866) typ 7.62 (0.300) typ r 1.52 (0.062) max (4x) all linear dimensions are in millimeters and parenthetically in inches part number speed package (ns) no. WED8L24257V10bc 10 391 WED8L24257V12bc 12 391 WED8L24257V15bc 15 391 part number speed package (ns) no. WED8L24257V12bi 12 391 WED8L24257V15bi 15 391
6 white electronic designs corporation ? (508) 366-5151 ?www.whiteedc.com WED8L24257V march 2000 rev. 1 fig. 8 interfacing the motorola dsp5630x dsp family with the WED8L24257V (256k x 24) address bus a 23-0 databus d 23-0 motorola dsp5630x WED8L24257V (256k x 24) aa 0 aa 1 aa 2 aa 3 wr rd a 17-0 e w g dq 0-23 WED8L24257V (256k x 24) a 17-0 e w g dq 0-23 WED8L24257V (256k x 24) a 17-0 e w g dq 0-23 notes: 1. in this example three 256k x 24 external memory arrays are shown, one for x data, one for y data and one for program. specific applications may require one, two, or all three arrays. 2. any combination of aa0-aa3 may be used as chip selects. however, each chip select may only be used to select one memory array. address bus a 31-0 databus d 47-0 analog adsp-2106xl WED8L24257V (256k x 24) ms x wr rd a 17-0 e w g dq 16-23 dq 8-15 dq 0-7 WED8L24257V (256k x 24) a 17-0 e w g dq 16-23 dq 8-15 dq 0-7 fig. 9 interfacing the analog devices 2106xl dsp family with the WED8L24257V (256k x 24)
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