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168-pin low profile esdram dimms preliminary data sheet 32mb, 64mb, 128mb enhanced memory systems inc., 1850 ramtron dr., colo spgs, co 80921 2001 enhanced memory systems. all rights reserved. phone: (800) 545-dram; fax: (719) 488-9095; http://www.edram.com the information contained herein is subject to change without notice. revision 1.0 page 1 of 15 features jedec standard 168-pin sdram dimm low latency 166 mhz modules (2:2:2) cas latency = 2 ras to cas delay = 2 precharge delay = 2 sustained random burst reads (same bank access) 1-1-1-1 at 66mhz (cl = 1) 2-1-1-1 at 166mhz (cl = 2) early auto-precharge and pipelined row activation hidden auto-refresh (4k, 64ms) fully synchronous operation on-board serial presence detect (spd) unbuffered 168-pin dimm single 3.3v 0.3v power supply low profile for iu rack mount systems description the enhanced sdram (esdram) dimms are low latency, high performance memory modules of 32, 64, and 128 mbyte capacities, and are organized x64 or x72 bits wide. these dimms are 100% pin, function, and timing compatible with jedec standard 168-pin sdram dimms. the 32 mbyte and 64 mbyte dimms employ a single physical bank of memory while the 128 mbyte dimms are built as two physical banks. within each physical bank of memory are four logical banks, which are accessed through the use of ba0 and ba1 (pins 122 and 39). all control, access, and data input signals are registered into each of the esdram components through use of an external clock, ck0-ck3. esdram dimms provide pipeline burst sram performance up to 66 mhz and nearly the same at bus speeds up to 166 mhz. this performance is achieved using jedec superset features including early auto-precharge and pipelined row activation. the esdram also supports hidden auto-refresh. all esdram dimms operate from a 3.3v power supply, and all inputs and outputs are lvttl compatible. the dimm has a low 1.15-inch height to support iu rack mount system requirements. see the esdram component data sheet for a more detailed discussion of esdram specifications and functional operation. pin symbol pin symbol pin symbol pin symbol 1 vss 43 vss 85 vss 127 vss 2 dq0 44 dnu 86 dq32 128 cke0 3 dq1 45 s2# 87 dq33 129 s3# 4 dq2 46 dqmb2 88 dq34 130 dqmb6 5 dq3 47 dqmb3 89 dq35 131 dqmb7 6 vdd 48 dnu 90 vdd 132 rfu 7 dq4 49 vdd 91 dq36 133 vdd 8 dq5 50 nc 92 dq37 134 nc 9 dq6 51 nc 93 dq38 135 nc 10 dq7 52 cb2 94 dq39 136 cb6 11 dq8 53 cb3 95 dq40 137 cb7 12 vss 54 vss 96 vss 138 vss 13 dq9 55 dq16 97 dq41 139 dq48 14 dq10 56 dq17 98 dq42 140 dq49 15 dq11 57 dq18 99 dq43 141 dq50 16 dq12 58 dq19 100 dq44 142 dq51 17 dq13 59 vdd 101 dq45 143 vdd 18 vdd 60 dq20 102 vdd 144 dq52 19 dq14 61 nc 103 dq46 145 nc 20 dq15 62 nc 104 dq47 146 nc 21 cb0 63 cke1 105 cb4 147 nc 22 cb1 64 vss 106 cb5 148 vss 23 vss 65 dq21 107 vss 149 dq53 24 nc 66 dq22 108 nc 150 dq54 25 nc 67 dq23 109 nc 151 dq55 26 vdd 68 vss 110 vdd 152 vss 27 we# 69 dq24 111 cas# 153 dq56 28 dqmb0 70 dq25 112 dqmb4 154 dq57 29 dqmb1 71 dq26 113 dqmb5 155 dq58 30 s0# 72 dq27 114 s1# 156 dq59 31 dnu 73 vdd 115 ras# 157 vdd 32 vss 74 dq28 116 vss 158 dq60 33 a0 75 dq29 117 a1 159 dq61 34 a2 76 dq30 118 a3 160 dq62 35 a4 77 dq31 119 a5 161 dq63 36 a6 78 vss 120 a7 162 vss 37 a8 79 ck2 121 a9 163 ck3 38 a10/ap 80 nc 122 ba0 164 nc 39 ba1 81 wp 123 a11 165 sa0 40 vdd 82 sda 124 vdd 166 sa1 41 vdd 83 scl 125 ck1 167 sa2 42 ck0 84 vdd 126 rfu 168 vdd
168-pin low profile esdram dimms 32mb, 64mb, 128mb preliminary data sheet enhanced memory systems inc., 1850 ramtron dr., colo spgs, co 80921 2001 enhanced memory systems. all rights reserved. phone: (800) 545-dram; fax: (719) 488-9095; http://www.edram.com the information contained herein is subject to change without notice. page 2 of 15 revision 1.0 pin descriptions symbol type function ck(0:3) input clo cks: all sdram i nput signals are sampled on the positive edge of ck. cke(0:1) input clock enables: cke activate (high) or deactivate (low) the ck signals. deactivating the clock initiates the power-down and self-refresh operations (all banks idle), or clock suspend operation. cke is synchronous until the device enters power-down and self-refresh modes where it is asynchronous until the mode is exited. s(0:3)# input chip select: s# enables (low) or disables (high) the command decoder. when the command decoder is disabled, new commands are ignored but previous operations continue. ras#, cas#, we# input command inputs: sampled on the rising edge of ck, these inputs define the command to be executed. ba(0:1) input bank addresses: these inputs define to which of the 4 banks a given command is being applied. a(0:11) input address inputs: a0-a11 define the row address during the bank activate command. a0-a8 define the column address during read and write commands. a10/ap invokes the auto-precharge operation. during manual precharge commands, a10/ap low specifies a single bank precharge while a10/ap high precharges all banks. the address inputs are also used to program the mode register. dq(0:63) input/ output data i/o: data bus inputs and outputs. for write cycles, input data is applied to these pins and must be set-up and held relative to the rising edge of clock. for read cycles, the device drives output data on these pins after the cas latency is satisfied. dqmb(0:7) input data i/o mask inputs: dqmb0-7 inputs mask write data (zero latency) and acts as a synchronous output enable (2-cycle latency) for read data. cb(0:7) input/ output ecc check bits v dd supply power supply: +3.3 v v ss supply ground sda input/ output serial presence-detect data: sda is a bi-directional pin used to transfer addresses and data into and data out of the presence-detect portion of the module. scl input serial clock for presence-detect: scl is used to synchronize the presence detect data transfer to and from the module sa(0:2) input presence-detect address inputs: these pins are used to configure the presence detect device. wp input serial presence detect write protect: active high inhibits writes to the spd eeprom. wp must be driven low for normal read/write operations. rfu - reserved for future use: these pins should be left unconnected. dnu - do not use. nc - no connect - open pin.
168-pin low profile esdram dimms preliminary data sheet 32mb, 64mb, 128mb enhanced memory systems inc., 1850 ramtron dr., colo spgs, co 80921 2001 enhanced memory systems. all rights reserved. phone: (800) 545-dram; fax: (719) 488-9095; http://www.edram.com the information contained herein is subject to change without notice. revision 1.0 page 3 of 15 32mb dimm functional block diagram C sm4m64aldt u0 u2 dq(15:0) dqmb0 s0# dq(47:32) dqmb4 u1 u3 dq(31:16) dqmb2 s2# dq(63:48) dqmb6 clock wiring 2 sdram+15 pf termination 2 sdram+15 pf termination ck0 ck1 ck2 ck3 10 ck0,2 sdrams clock termination 10 ck1,3 serial pd scl sa0-2 sda 10 pf 47k wp ba1 sdram u0-3 ba1 ba0 sdram u0-3 ba0 ras# sdram u0-3 ras# a0-a11 sdram u0-3 a0-a11 vdd sdram u0-3 vdd vss sdram u0-3 vss cas# sdram u0-3 cas# we# sdram u0-3 we# cke0 sdram u0-3 cke0 note: all dq resistor values are 10 ohms. all ck resistor values are 10 ohms. u0-u3 are sm2604t. dqmb1 dqmb5 dqmb3 dqmb7
168-pin low profile esdram dimms 32mb, 64mb, 128mb preliminary data sheet enhanced memory systems inc., 1850 ramtron dr., colo spgs, co 80921 2001 enhanced memory systems. all rights reserved. phone: (800) 545-dram; fax: (719) 488-9095; http://www.edram.com the information contained herein is subject to change without notice. page 4 of 15 revision 1.0 64mb dimm functional block diagram C sm8m64aldt u0 u1 dq(7:0) dqmb0 s0# dq(15:8) dqmb1 u2 u3 dq(23:16) dqmb2 s2# dq(31:24) dqmb3 u4 u5 dq(39:32) dqmb4 dq(47:40) dqmb5 u6 u7 dq(55:48) dqmb6 dq(63:56) dqmb7 clock wiring 4 sdram+3.3 pf termination 4 sdram+3.3 pf termination ck0 ck1 ck2 ck3 10 ck0,2 sdrams clock termination 10 ck1,3 serial pd scl sa0-2 sda 10 pf 47k wp ba1 sdram u0-7 ba1 ba0 sdram u0-7 ba0 ras# sdram u0-7 ras# a0-a11 sdram u0-7 a0-a11 vdd sdram u0-7 vdd vss sdram u0-7 vss cas# sdram u0-7 cas# we# sdram u0-7 we# cke sdram u0-7 cke0 note: all dq resistor values are 10 ohms. all ck resistor values are 10 ohms. u0-u7 are sm2603t.
168-pin low profile esdram dimms preliminary data sheet 32mb, 64mb, 128mb enhanced memory systems inc., 1850 ramtron dr., colo spgs, co 80921 2001 enhanced memory systems. all rights reserved. phone: (800) 545-dram; fax: (719) 488-9095; http://www.edram.com the information contained herein is subject to change without notice. revision 1.0 page 5 of 15 64mb ecc dimm functional block diagram C sm8m72aldt u0 u1 dq(7:0) dqmb0 s0# dq(15:8) dqmb1 u3 u4 dq(23:16) dqmb2 s2# dq(31:24) dqmb3 u5 u6 dq(39:32) dqmb4 dq(47:40) dqmb5 u7 u8 dq(55:48) dqmb6 dq(63:56) dqmb7 u2 cb(7:0) clock wiring 5 sdram termination 4 sdram+3.3 pf termination ck0 ck1 ck2 ck3 10 ck0,2 sdrams clock termination 10 ck1,3 serial pd scl sa0-2 sda 10 pf 47k wp ba1 sdram u0-8 ba1 ba0 sdram u0-8 ba0 ras# sdram u0-8 ras# a0-a11 sdram u0-8 a0-a11 vdd sdram u0-8 vdd vss sdram u0-8 vss cas# sdram u0-8 cas# we# sdram u0-8 we# cke sdram u0-8 cke0 note: all dq resistor values are 10 ohms. all ck resistor values are 10 ohms. u0-u8 are sm2603t.
168-pin low profile esdram dimms 32mb, 64mb, 128mb preliminary data sheet enhanced memory systems inc., 1850 ramtron dr., colo spgs, co 80921 2001 enhanced memory systems. all rights reserved. phone: (800) 545-dram; fax: (719) 488-9095; http://www.edram.com the information contained herein is subject to change without notice. page 6 of 15 revision 1.0 128mb dimm functional block diagram C sm16m64aldt dq(7:0) dqmb0 s0# dq(15:8) dqmb1 dq(23:16) dqmb2 s2# dq(31:24) dqmb3 dq(39:32) dqmb4 dq(47:40) dqmb5 dq(55:48) dqmb6 dq(63:56) dqmb7 u0 u1 u8 u9 u4 u12 u5 u13 u2 u10 u6 u3 u11 u14 u7 u15 s1# s3# scl sa0-2 ba1 sdram u0-15 ba1 ba0 sdram u0-15 ba0 ras# sdram u0-15 ras# a0-a11 sdram u0-15 a0-a11 vdd sdram u0-15 vdd vss sdram u0-15 vss cas# sdram u0-15 cas# we# sdram u0-15 we# cke sdram u0-7 cke0 clock wiring 4 sdram+3.3 pf 4 sdram+3.3 pf 4 sdram+3.3 pf 4 sdram+3.3 pf ck0 ck1 ck2 ck3 10 ck(0:3) sdrams serial pd sda 47k wp note: all dq resistor values are 10 ohms. all ck resistor values are 10 ohms. u0-u15 are sm2603t. cke sdram u8-15 cke1
168-pin low profile esdram dimms preliminary data sheet 32mb, 64mb, 128mb enhanced memory systems inc., 1850 ramtron dr., colo spgs, co 80921 2001 enhanced memory systems. all rights reserved. phone: (800) 545-dram; fax: (719) 488-9095; http://www.edram.com the information contained herein is subject to change without notice. revision 1.0 page 7 of 15 128mb ecc dimm functional block diagram C sm16m72aldt dq(7:0) dqmb0 s0# dq(15:8) dqmb1 dq(23:16) dqmb2 s2# dq(31:24) dqmb3 dq(39:32) dqmb4 dq(47:40) dqmb5 dq(55:48) dqmb6 dq(63:56) dqmb7 u0 u1 u9 u10 u5 u14 u6 u15 u3 u12 u7 u4 u13 u16 u8 u17 s1# s3# u2 u11 dq(15:8) note: sdram u11 dqm input is wired to dqmb5. scl sa0-2 ba1 sdram u0-17 ba1 ba0 sdram u0-17 ba0 ras# sdram u0-17 ras# a0-a11 sdram u0-17 a0-a11 vdd sdram u0-17 vdd vss sdram u0-17 vss cas# sdram u0-17 cas# we# sdram u0-17 we# cke sdram u0-8 cke0 clock wiring 5 sdram 5 sdram 4 sdram+3.3 pf 4 sdram+3.3 pf ck0 ck1 ck2 ck3 10 ck(0:3) sdrams serial pd sda 47k wp note: all dq resistor values are 10 ohms. all ck resistor values are 10 ohms. u0-u17 are sm2603t. cke sdram u9-17 cke1
168-pin low profile esdram dimms 32mb, 64mb, 128mb preliminary data sheet enhanced memory systems inc., 1850 ramtron dr., colo spgs, co 80921 2001 enhanced memory systems. all rights reserved. phone: (800) 545-dram; fax: (719) 488-9095; http://www.edram.com the information contained herein is subject to change without notice. page 8 of 15 revision 1.0 electrical characteristics absolute maximum ratings description symbol value power supply voltage v dd -1v to +4.6v voltage on any pin with respect to ground v in , v out -0.5v to +4.6v operating temperature (ambient) t a 0 c to +70 c storage temperature t stg -55 c to +125 c power dissipation p d tbd dc output current (i/o pins) i out 50ma stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress ra ting only, and the functional operation of the device at these, or any other conditions above those listed in the operational sectio n of the specification, is not implied. exposure to conditions at absolute maximum ratings for extended periods may affect device reliab ility. dc operating conditions (t a = 0 c to 70 c) symbol parameter min typical max units notes v dd supply voltage 3.0 3.3 3.6 v v ih input high voltage 2.0 3.3 v dd + 0.3 v v il input low voltage -0.3 0.0 0.8 v i i(l) input leakage current - - 1 m a i o(l) output leakage current - - 1 m a v oh output high voltage (i out = -4ma) 2.4 - v dd v v ol output low voltage (i out = +4ma) 0.0 - 0.4 v capacitance (t a = 25 c, f = 1mhz, vdd = 3.3v 0.3v, not 100% tested) 32mb 64mb 128mb symbol parameter non-ecc non-ecc ecc non-ecc ecc units c in1 input capacitance (ba1, ba0, a0- 11, ras, cas,we) 32 52 57 92 102 pf c in2 input capacitance (s0 - s3) 18 27 32 27 32 pf c in3 input capacitance (ck0 - ck3) 30 33 36 33 36 pf c in4 input capacitance (cke0, cke1) 32 52 57 52 57 pf c in5 input capacitance (dqmb0-7) 14 14 14 19 19 pf c in6 input capacitance (scl, sa0-2) 14 14 14 14 14 pf c i/o1 i/o capacitance (sda) 14 14 14 14 14 pf c i/o2 i/o capacitance (dq0-63, cb0-7) 10 10 10 16 16 pf
168-pin low profile esdram dimms preliminary data sheet 32mb, 64mb, 128mb enhanced memory systems inc., 1850 ramtron dr., colo spgs, co 80921 2001 enhanced memory systems. all rights reserved. phone: (800) 545-dram; fax: (719) 488-9095; http://www.edram.com the information contained herein is subject to change without notice. revision 1.0 page 9 of 15 ac characteristics (t a = 0 c to 70 c) 1. an initial pause of 200 m s is required after power-up, then a precharge all banks command must be given followed by a minimum of eight auto (cbr) refresh cycles before the mode register set operation can begin. 2. ac timing tests have v il = 0.8v and v ih = 2.0v with the timing referenced to the v tt = 1.4v crossover point. t setup t hold clock input output t lz t ac t oh t t vih vtt vil v tt output z 0 = 50 ohm c load = 50pf ac output load circuit v tt r t = 50 ohm 3. the transition time is measured between v ih and v il (or between v ih and v il ). 4. ac measurements assume t t = 1ns. 5. in addition to meeting the transition rate specification, the clock and cke must transition v ih and v il (or between v ih and v il ) in a monotonic manner.
168-pin low profile esdram dimms 32mb, 64mb, 128mb preliminary data sheet enhanced memory systems inc., 1850 ramtron dr., colo spgs, co 80921 2001 enhanced memory systems. all rights reserved. phone: (800) 545-dram; fax: (719) 488-9095; http://www.edram.com the information contained herein is subject to change without notice. page 10 of 15 revision 1.0 ac operating conditions (t a = 0 c to 70 c) clock and clock enable parameters -6 -7.5 symbol parameter min max min max units notes t ck2 clock cycle time, cl = 2, 3 6.0 - 7.5 - ns t ck1 clock cycle time, cl = 1 12 - 15 - ns t ckh2 , t ckl2 clock high & low times, cl=2, 3 2.4 - 2.8 - ns 1 t ckh1 , t ckl1 clock high & low times, cl=1 5 - 6 - ns 1 t ckes clock enable set-up time 1.5 - 1.5 - ns t ckeh clock enable hold time 0.8 - 0.8 - ns t cksp cke set-up time (power down mode) 1.5 - 1.5 - ns t t transition time (rise and fall) - 2 - 3 ns notes: 1. assumes clock rise and fall times are equal to 1ns. if rise or fall time exceeds 1ns, other ac timing parameters must be co mpensated by an additional [(t rise +t fall )/2-1] ns. common parameters -6 -7.5 symbol parameter min max min max units notes t cs command and address set-up time 1.5 - 1.5 - ns t ch command and address hold time 0.8 - 0.8 - ns t rcd ras to cas delay time 12 - 15 - ns t rc bank cycle time 30 - 37.5 - ns t ras bank active time 18 120k 22.5 120k ns t rp precharge time 12 - 15 - ns t rrd bank to bank delay time (alt. bank) 12 - 15 - ns t ccd cas to cas delay time (same bank) 6 - 7.5 - ns t mrd mode register set to active delay 2 - 2 - clk
168-pin low profile esdram dimms preliminary data sheet 32mb, 64mb, 128mb enhanced memory systems inc., 1850 ramtron dr., colo spgs, co 80921 2001 enhanced memory systems. all rights reserved. phone: (800) 545-dram; fax: (719) 488-9095; http://www.edram.com the information contained herein is subject to change without notice. revision 1.0 page 11 of 15 read and write parameters -6 -7.5 symbol parameter min max min max units notes t ac3 clock access time, cl = 3 - 4.3 - 4.5 ns 1,2 t ac2 clock access time, cl = 2 - 4.6 - 4.8 ns 1,2 t ac1 clock access time, cl = 1 - 10.5 - 11 ns 1,2 t oh3 data output hold time (cl=3) 2.0 - 2.0 - ns t oh2 data output hold time (cl=2) 2.3 - 2.3 - ns t oh1 data output hold time (cl=1) 3.0 - 3.0 - ns t lz data output to low-z time 0 - 0 - ns t hz2 data output to high-z time (cl=2, 3) - 4.6 - 4.8 ns 3 t hz1 data output to high-z time (cl=1) - 7.0 - 7.5 ns 3 t dqz dqm data output disable time 2 - 2 - clk t ds data input set-up time 1.5 - 1.5 - ns t dh data input hold time 0.8 - 0.8 - ns t dpl data input to precharge 6.0 - 7.5 - ns t dal data input to actv/refresh 20.0 - 22.5 - ns t dqw data write mask latency 0 - 0 - clk notes: 1. access time is measured at 1.4v (lvttl) at max clock rate for the cas latency specified. see ac test load. 2. access time is based on a clock rise time of 1ns. if clock rise time is longer than 1ns, then (trise/2-0.5) ns must be added to the access time. 3. referenced to the time at which the output achieves an open circuit condition. refresh parameters -6 -7.5 symbol parameter min max min max units notes t ref refresh period - 64 - 64 ms 1,2 t srex self refresh exit time 2clk+t rc 2clk+t rc - ns 3 notes: 1. 4096 cycles. 2. any time that the refresh period has been exceeded, a minimum of two auto- refresh (cbr) commands must be given to wake up the device. 3. self-refresh exit is a synchronous operation and begins on the 2nd positive clock edge after cke returns high. self-refresh exi t is not completed until trc is satisfied once the self-refresh exit command is registered.
168-pin low profile esdram dimms 32mb, 64mb, 128mb preliminary data sheet enhanced memory systems inc., 1850 ramtron dr., colo spgs, co 80921 2001 enhanced memory systems. all rights reserved. phone: (800) 545-dram; fax: (719) 488-9095; http://www.edram.com the information contained herein is subject to change without notice. page 12 of 15 revision 1.0 serial presence detect (spd) for esdram dimms 32mb 64mb 128mb 32mb 64mb 128mb byte description ** hex code ** 0 number of bytes written into eeprom 128 128 128 80 80 80 1 total number of spd bytes 256 256 256 08 08 08 2 memory type sdram sdram sdram 04 04 04 3 number of row addresses 12 12 12 0c 0c 0c 4 number of column addresses 8 9 9 08 09 09 5 number of module banks 1 1 2 01 01 02 6 module data width x64 x72 x64 x64 x72 x64 x72 40 40 48 40 48 7 module data width (cont'd) 0 0 0 00 00 00 8 voltage interface levels lvttl lvttl lvttl 01 01 01 9 cycle time at max cas latency 6.0 ns 6.0 ns 6.0 ns 60 60 60 10 sdram clock access time 4.3 ns 4.3 ns 4.3 ns 43 43 43 11 dimm config (non-parity, parity, ecc) --- non-parity --- --- ecc --- 00 00 02 00 02 12 refresh rate and type --- 15.625us / self --- 80 80 80 13 primary sdram width x16 x8 x8 10 08 08 14 error checking data width x64 x72 n/a n/a x8 n/a x8 00 00 08 00 08 15 min. cas-to-cas delay (tccd) 1 clk 1 clk 1 clk 01 01 01 16 burst lengths supported --- 1,2,4,8,full pg --- 8f 8f 8f 17 number of banks on sdram device 4 4 4 04 04 04 18 cas latencies supported 1,2,3 1,2,3 1,2,3 07 07 07 19 cs latency 0 0 0 01 01 01 20 write latency 0 0 0 01 01 01 21 sdram module attributes --- unbuffered --- 00 00 00 22 sdram device attributes +/-10% vdd, precharge all 07 07 07 23 min. clock cycle time at cl=2 6 ns 6 ns 6 ns 60 60 60 24 clock access time at cl=2 (tac2) 4.6 ns 4.6 ns 4.6 ns 46 46 46 25 min. clock cycle time at cl=1 12 ns 12 ns 12 ns 30 30 30 26 clock access time at cl=1 (tac1) 10.5 ns 10.5 ns 10.5 ns 2a 2a 2a 27 min. row precharge time (trp) 12 ns 12 ns 12 ns 0c 0c 0c 28 min. row-to-row delay (trrd) 12 ns 12 ns 12 ns 0c 0c 0c 29 min. ras-to-cas delay (trcd) 12 ns 12 ns 12 ns 0c 0c 0c 30 min. ras pulse width (tras) 18 ns 18 ns 18 ns 12 12 12 31 density of each bank on module 32mb 64mb 64mb 08 10 10 32 cmd/addr input set-up time 1.5 ns 15 15 15 33 cmd/addr input hold time 0.8 ns 08 08 08 34 data input set-up time 1.5 ns 15 15 15 35 data input hold time 0.8 ns 08 08 08 36-60 superset information - - - 00 00 00 61 superset information (contd) esdram defined for code=01 01 01 01 62 spd rev. 1.2 12 12 12 63 checksum for bytes 0-62 non-ecc ecc - - - 44 45 57 46 58 64-71 jedec id code enhanced memory systems 7f32ffffffffffff 72 manufacturing location - - - xxxx xxxx xxxx 73-90 manufacturer's part # x64 x72 sm4m64aldt sm8m64aldt sm8m72aldt sm16m64aldt sm16m72aldt xxxx xxxx xxxx xxxx xxxx 91,92 pcb rev. code - rrrr rrrr rrrr 93,94 manufacturing date yyww code yyww yyww yyww 95-98 assembly serial # serial number ssss ssss ssss 99-125 manufacturer's specific data open 00 00 00 126 intel specification frequency 100mhz 64 64 64 127 intel specification cl and clock support - - - af af ff 128-255 open for customer use - - - 00 00 00
168-pin low profile esdram dimms preliminary data sheet 32mb, 64mb, 128mb enhanced memory systems inc., 1850 ramtron dr., colo spgs, co 80921 2001 enhanced memory systems. all rights reserved. phone: (800) 545-dram; fax: (719) 488-9095; http://www.edram.com the information contained herein is subject to change without notice. revision 1.0 page 13 of 15 mechanical drawing front view 5.250 (133.35) typ pin 84 (pin 168 on backside) 0.118 (3.00) typ pin 1 (pin 85 on backside) 2.625 (66.68) 0.250 (6.35) typ 4.550 (115.57) 1.660 (42.16) dimensions: inches (mm) 168 - pin low profile dimm .040 (1.02) typ pad width 0.118 (3.00) typ 0.128 (3.25) 0.118 (3.00) (2x) .079 (2.00) r (2x) 0.118 (3.00) (2x) 0.144 (3.67) max 0.055 (1.40) 0.045 (1.14) 0.097 (2.47) max 1.158 (29.41) typ 0.700 (17.78) typ 0.090 (2.29) typ 0.130 (3.30) typ 0.050 (1.27) r (2x) 0.039 (1.00)r (2x) .050 (1.27) typ pitch + + +
168-pin low profile esdram dimms 32mb, 64mb, 128mb preliminary data sheet enhanced memory systems inc., 1850 ramtron dr., colo spgs, co 80921 2001 enhanced memory systems. all rights reserved. phone: (800) 545-dram; fax: (719) 488-9095; http://www.edram.com the information contained herein is subject to change without notice. page 14 of 15 revision 1.0 revision log revision date summary of changes 1.0 3/16/01 first draft
168-pin low profile esdram dimms preliminary data sheet 32mb, 64mb, 128mb enhanced memory systems inc., 1850 ramtron dr., colo spgs, co 80921 2001 enhanced memory systems. all rights reserved. phone: (800) 545-dram; fax: (719) 488-9095; http://www.edram.com the information contained herein is subject to change without notice. revision 1.0 page 15 of 15 ordering information part number capacity i/o width i/o type package power supply maximum operating frequency (mhz) sm4m64aldt-6 32 mb x64 lvttl 168-pin dimm 3.3v 166 sm4m64aldt-7.5 32 mb x64 lvttl 168-pin dimm 3.3v 133 sm8m64aldt-6 64 mb x64 lvttl 168-pin dimm 3.3v 166 sm8m64aldt-7.5 64 mb x64 lvttl 168-pin dimm 3.3v 133 sm8m72aldt-6 64 mb x72 lvttl 168-pin dimm 3.3v 166 sm8m72aldt-7.5 64 mb x72 lvttl 168-pin dimm 3.3v 133 sm16m64aldt-6 128 mb x64 lvttl 168-pin dimm 3.3v 166 sm16m64aldt-7.5 128 mb x64 lvttl 168-pin dimm 3.3v 133 sm16m72aldt-6 128 mb x72 lvttl 168-pin dimm 3.3v 166 sm16m72aldt-7.5 128 mb x72 lvttl 168-pin dimm 3.3v 133

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