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1 white electronic designs corporation ? (602) 437-1520 ? www.wedc.com white electronic designs WEDPN4M72V-xbx april, 2004 rev. 15 white electronic designs corp. reserves the right to change products or speci?cations without notice. not recommended* general description the 32mbyte (256mb) sdram is a high-speed cmos, dynamic random-access ,memory using 5 chips containing 67,108,864 bits. each chip is internally con?gured as a quad-bank dram with a synchronous interface. each of the chips 16,777,216-bit banks is organized as 4,096 rows by 256 columns by 16 bits. read and write accesses to the sdram are burst oriented; accesses start at a selected location and continue for a programmed number of locations in a programmed sequence. accesses begin with the registration of an active command, which is then followed by a read or write command. the address bits registered coincident with the active command are used to select the bank and row to be accessed (ba0, ba1 select the bank; a0- 11 select the row). the address bits registered coincident with the read or write command are used to select the starting column location for the burst access. the sdram provides for programmable read or write burst lengths of 1, 2, 4 or 8 locations, or the full page, with a burst terminate option. an auto precharge function may be enabled to provide a self-timed row precharge that is initiated at the end of the burst sequence. the 256mb sdram uses an internal pipelined architecture to achieve high-speed operation. this architecture is compatible with the 2n rule of prefetch architectures, but it also allows the column address to be changed on every clock cycle to achieve a high-speed, fully random access. precharging one bank while accessing one of the other three banks will hide the precharge cycles and provide seamless, high-speed, random-access operation. 4mx72 synchronous dram* features ? high frequency = 100, 125mhz ? package: ? 219 plastic ball grid array (pbga), 25 x 21mm ? single 3.3v 0.3v power supply ? fully synchronous; all signals registered on positive edge of system clock cycle ? internal pipelined operation; column address can be changed every clock cycle ? internal banks for hiding row access/precharge ? programmable burst length 1,2,4,8 or full page ? 4096 refresh cycles ? commercial, industrial and military temperature ranges ? organized as 4m x 72 ? weight: WEDPN4M72V-xbx - 2 grams typical benefits ? 60% space savings ? reduced part count ? reduced i/o count ? 19% i/o reduction ? lower inductance and capacitance for low noise performance ? suitable for hi-reliability applications ? upgradeable to 8m x 72 density with same footprint (contact factory for information) * this product is not recommended for new designs , refer to WEDPN4M72V-xb2x for new designs. 25 21 discrete approach s a v i n g s area 5 x 265m m 2 = 1328m m 2 525m m 2 60% 5 x 54 pins = 270 pins 219 balls 19% actual size 22. 3 11 .9 11 .9 i/o count 11 .9 11 .9 11 .9 54 tsop 54 tsop 54 tsop 54 tsop 54 tsop white electronic designs WEDPN4M72V -xbx
2 white electronic designs corporation ? (602) 437-1520 ? www.wedc.com white electronic designs WEDPN4M72V-xbx april, 2004 rev. 15 white electronic designs corp. reserves the right to change products or speci?cations without notice. pin configuration note: dnu = do not use, to be left unconnected for future upgrades. * pin d7 is dnu for 4m x 72, 8m x 72 product, pin d7 is a12 for 16m x 72 and higher densities. top view 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 a dq0 dq14 dq15 v ss v ss a9 a10 a11 a8 v cc v cc dq16 dq17 dq31 v ss b dq1 dq2 dq12 dq13 v ss v ss a0 a7 a6 a1 v cc v cc dq18 dq19 dq29 dq30 c dq3 dq4 dq10 dq11 v cc v cc a2 a5 a4 a3 v ss v ss dq20 dq21 dq27 dq28 d dq6 dq5 dq8 dq9 v cc v cc dnu* dnu dnu dnu v ss v ss dq22 dq23 dq26 dq25 e dq7 dqml0 v cc dqmh0 nc nc nc ba0 ba1 nc nc nc dqml1 v ss nc dq24 f cas0# we0# v cc ck0 nc ras1# we1# v ss dqmh1 ck1 g cs0# ras0# v cc cke0 nc cas1# cs1# v ss nc cke1 h v ss v ss v cc v cc v ss v cc v ss v ss v cc v cc j v ss v ss v cc v cc v ss v cc v ss v ss v cc v cc k nc cke3 v cc cs3# nc nc cke2 v ss ras2# cs2# l nc ck3 v cc cas3# ras3# nc ck2 v ss we2# cas2# m dq56 dqmh3 v cc we3# dqml3 cke4 dqmh4 ck4 cas4# we4# ras4# cs4# dqmh2 v ss dqml2 dq39 n dq57 dq58 dq55 dq54 nc nc dq73 dq72 dq71 dq70 dqml4 nc dq41 dq40 dq37 dq38 p dq60 dq59 dq53 dq52 v ss v ss dq75 dq74 dq69 dq68 v cc v cc dq43 dq42 dq36 dq35 r dq62 dq61 dq51 dq50 v cc v cc dq77 dq76 dq67 dq66 v ss v ss dq45 dq44 dq34 dq33 t v ss dq63 dq49 dq48 v cc v cc dq79 dq78 dq65 dq64 v ss v ss dq47 dq46 dq32 v cc
3 white electronic designs corporation ? (602) 437-1520 ? www.wedc.com white electronic designs WEDPN4M72V-xbx april, 2004 rev. 15 white electronic designs corp. reserves the right to change products or speci?cations without notice. fig. 1 C functional block diagram a0-1 1 ba0- 1 ck0 cke0 cs0 # dqml 0 dqmh0 ras 1# we1 # cas 1# ? ? ? ? ? ? ? ? ? ? ? ? u1 ck 1 ras 0# we0 # cas 0# ? ? ? ? ? ? ? ? ? ? ? ? u0 cke 1 cs 1 # dqml 1 dqmh 1 ras 2# we2 # cas 2# ? ? ? ? ? ? ? ? ? ? ? ? u2 ck 2 cke 2 cs 2 # dqml 2 dqmh 2 ras 3# we3 # cas 3# ? ? ? ? ? ? ? ? ? ? ? ? u3 ck 3 cke 3 cs 3 # dqml 3 dqmh 3 ras 4# we4 # cas 4# ? ? ? ? ? ? ? ? ? ? ? ? u4 ck 4 cke 4 cs 4 # dqml 4 dqmh 4 dq0 dq1 5 dq0 dq15 a0- 11 ba0-1 ck cas# cke cs# dqml dqmh we# ras# dq1 6 dq3 1 dq0 dq15 a0- 11 ba0-1 ck cas# cke cs# dqml dqmh we# ras# dq3 2 dq4 7 dq0 dq15 a0- 11 ba0-1 ck cas# cke cs# dqml dqmh we# ras# dq4 8 dq6 3 dq0 dq15 a0- 11 ba0-1 ck cas# cke cs# dqml dqmh we# ras# dq6 4 dq7 9 dq0 dq15 a0- 11 ba0-1 ck cas# cke cs# dqml dqmh we# ras#
4 white electronic designs corporation ? (602) 437-1520 ? www.wedc.com white electronic designs WEDPN4M72V-xbx april, 2004 rev. 15 white electronic designs corp. reserves the right to change products or speci?cations without notice. must be performed. after the auto refresh cycles are complete, the sdram is ready for mode register programming. because the mode register will power up in an unknown state, it should be loaded prior to applying any operational command. register definition mode register the mode register is used to de?ne the speci?c mode of operation of the sdram. this de?nition includes the selection of a burst length, a burst type, a cas latency, an operating mode and a write burst mode, as shown in figure 2. the mode register is programmed via the load mode register command and will retain the stored information until it is programmed again or the device loses power. mode register bits m0-m2 specify the burst length, m3 speci?es the type of burst (sequential or interleaved), m4-m6 specify the cas latency, m7 and m8 specify the operating mode, m9 speci?es the write burst mode, and m10 and m11 are reserved for future use. the mode register must be loaded when all banks are idle, and the controller must wait the speci?ed time before initiating the subsequent operation. violating either of these requirements will result in unspeci?ed operation. burst length read and write accesses to the sdram are burst oriented, with the burst length being programmable, as shown in figure 2. the burst length determines the maximum number of column locations that can be accessed for a given read or write command. burst lengths of 1, 2, 4 or 8 locations are available for both the sequential and the interleaved burst types, and a full-page burst is available for the sequential type. the full-page burst is used in conjunction with the burst terminate command to generate arbitrary burst lengths. reserved states should not be used, as unknown operation or incompatibility with future versions may result. when a read or write command is issued, a block of columns equal to the burst length is effectively selected. all accesses for that burst take place within this block, meaning that the burst will wrap within the block if a boundary is reached. the block is uniquely selected by a1-7 when the burst length is set to two; by a2-7 when the burst length is set to four; and by a3-7 when the burst the 256mb sdram is designed to operate in 3.3v, low- power memory systems. an auto refresh mode is provided, along with a power-saving, power-down mode. all inputs and outputs are lv ttl compatible. sdrams offer substantial advances in dram operating performance, including the ability to synchronously burst data at a high data rate with automatic column-address generation, the ability to interleave between internal banks in order to hide precharge time and the capability to randomly change column addresses on each clock cycle during a burst access. functional description read and write accesses to the sdram are burst oriented; accesses start at a selected location and continue for a programmed number of locations in a programmed sequence. accesses begin with the registration of an active command which is then followed by a read or write command. the address bits registered coincident with the active command are used to select the bank and row to be accessed (ba0 and ba1 select the bank, a0-11 select the row). the address bits (a0-7) registered coincident with the read or write command are used to select the starting column location for the burst access. prior to normal operation, the sdram must be initialized. the following sections provide detailed information covering device initialization, register de?nition, command descriptions and device operation. initialization sdrams must be powered up and initialized in a prede?ned manner. operational procedures other than those speci?ed may result in unde?ned operation. once power is applied to v cc and v ccq (simultaneously) and the clock is stable (stable clock is de?ned as a signal cycling within timing constraints specified for the clock pin), the sdram requires a 100s delay prior to issuing any command other than a command inhibit or a nop. starting at some point during this 100s period and continuing at least through the end of this period, command inhibit or nop commands should be applied. once the 100s delay has been satis?ed with at least one command inhibit or nop command having been applied, a precharge command should be applied. all banks must be precharged, thereby placing the device in the all banks idle state. once in the idle state, two auto refresh cycles
5 white electronic designs corporation ? (602) 437-1520 ? www.wedc.com white electronic designs WEDPN4M72V-xbx april, 2004 rev. 15 white electronic designs corp. reserves the right to change products or speci?cations without notice. table 1 - burst definition fig. 2 mode register definition notes: 1. for full-page accesses: y = 256. 2. for a burst length of two, a1-7 select the block-of-two burst; a0 selects the starting column within the block. 3. for a burst length of four, a2-7 select the block-of-four burst; a0-1 select the starting column within the block. 4. for a burst length of eight, a3-7 select the block-of-eight burst; a0-2 select the starting column within the block. 5. for a full-page burst, the full row is selected and a0-7 select the starting column. 6. whenever a boundary of the block is reached within a given sequence above, the following access wraps within the block. 7. for a burst length of one, a0-7 select the unique column to be accessed, and mode register bit m3 is ignored. m3 = 0 1 2 4 8 reserved reserved reserved full page m3 = 1 1 2 4 8 reserved reserved reserved reserved operating mode standard operation all other states reserved 0 - 0 - defined - 0 1 burst t ype sequential interleaved cas latency reserved reserved 2 3 reserved reserved reserved reserved burst length m0 0 1 0 1 0 1 0 1 b urst length cas latency bt a 9 a 7 a 6 a 5 a 4 a 3 a 8 a 2 a 1 a 0 mode register (mx) address bus m1 0 0 1 1 0 0 1 1 m2 0 0 0 0 1 1 1 1 m3 m4 0 1 0 1 0 1 0 1 m5 0 0 1 1 0 0 1 1 m6 0 0 0 0 1 1 1 1 m6-m 0 m8 m7 op mode a 10 a 11 reserved* wb 0 1 wr ite burst mode programmed burst length single location access m9 *should program m1 1, m10 = 0, 0 to ensure compatibility with future devices. burst length starting column address order of accesses within a burst type = sequential type = interleaved 2 a0 0 0-1 0-1 1 1-0 1-0 4 a1 a0 0 0 0-1-2-3 0-1-2-3 0 1 1-2-3-0 1-0-3-2 1 0 2-3-0-1 2-3-0-1 1 1 3-0-1-2 3-2-1-0 8 a2 a1 a0 0 0 0 0-1-2-3-4-5-6-7 0-1-2-3-4-5-6-7 0 0 1 1-2-3-4-5-6-7-0 1-0-3-2-5-4-7-6 0 1 0 2-3-4-5-6-7-0-1 2-3-0-1-6-7-4-5 0 1 1 3-4-5-6-7-0-1-2 3-2-1-0-7-6-5-4 1 0 0 4-5-6-7-0-1-2-3 4-5-6-7-0-1-2-3 1 0 1 5-6-7-0-1-2-3-4 5-4-7-6-1-0-3-2 1 1 0 6-7-0-1-2-3-4-5 6-7-4-5-2-3-0-1 1 1 1 7-0-1-2-3-4-5-6 7-6-5-4-3-2-1-0 full page (y) n = a 0 -9/8/7 (location 0-y) cn, cn + 1, cn + 2 cn + 3, cn + 4... cn - 1, cn not supported
6 white electronic designs corporation ? (602) 437-1520 ? www.wedc.com white electronic designs WEDPN4M72V-xbx april, 2004 rev. 15 white electronic designs corp. reserves the right to change products or speci?cations without notice. fig. 3 C cas latency reserved states should not be used as unknown operation or incompatibility with future versions may result. operating mode the normal operating mode is selected by setting m7and m8 to zero; the other combinations of values for m7 and m8 are reserved for future use and/or test modes. the programmed burst length applies to both read and write bursts. test modes and reserved states should not be used because unknown operation or incompatibility with future versions may result. write burst mode when m9 = 0, the burst length programmed via m0-m2 applies to both read and write bursts; when m9 = 1, the programmed burst length applies to read bursts, but write accesses are single-location (nonburst) accesses. table 2 C cas latency speed allowable operating frequency (mhz) cas latency = 2 cas latency = 3 -100 75 100 -125 100 125 length is set to eight. the remaining (least signi?cant) address bit(s) is (are) used to select the starting location within the block. full-page bursts wrap within the page if the boundary is reached. burst type accesses within a given burst may be programmed to be either sequential or interleaved; this is referred to as the burst type and is selected via bit m3. the ordering of accesses within a burst is determined by the burst length, the burst type and the starting column address, as shown in table 1. cas latency the cas latency is the delay, in clock cycles, between the registration of a read command and the availability of the ?rst piece of output data. the latency can be set to two or three clocks. if a read command is registered at clock edge n, and the latency is m clocks, the data will be available by clock edge n+m. the i/os will start driving as a result of the clock edge one cycle earlier (n + m - 1), and provided that the relevant access times are met, the data will be valid by clock edge n + m. for example, assuming that the clock cycle time is such that all relevant access times are met, if a read command is registered at t0 and the latency is programmed to two clocks, the i/os will start driving after t1 and the data will be valid by t2. table 2 below indicates the operating frequencies at which each cas latency setting can be used. ck i/o t2 t1 t3 t0 cas latency = 3 lz d out t oh t command nop read t ac nop t4 nop dont care undefined ck i/o t2 t1 t3 t0 cas latency = 2 lz d out oh t command read t ac nop nop
7 white electronic designs corporation ? (602) 437-1520 ? www.wedc.com white electronic designs WEDPN4M72V-xbx april, 2004 rev. 15 white electronic designs corp. reserves the right to change products or speci?cations without notice. when all banks are idle, and a subsequent executable command cannot be issued until t mrd is met. active the active command is used to open (or activate) a row in a particular bank for a subsequent access. the value on the ba0, ba1 inputs selects the bank, and the address provided on inputs a0-11 selects the row. this row remains active (or open) for accesses until a precharge command is issued to that bank. a precharge command must be issued before opening a different row in the same bank. read the read command is used to initiate a burst read access to an active row. the value on the ba0, ba1 inputs selects the bank, and the address provided on inputs a0-7 selects the starting column location. the value on input a10 determines whether or not auto precharge is used. if auto precharge is selected, the row being accessed will be precharged at the end of the read burst; if auto precharge is not selected, the row will remain open for subsequent accesses. read data appears on the i/os subject to the logic level on the dqm inputs two clocks earlier. if a given dqm signal was registered high, the corresponding i/os will be high-z two clocks commands the truth table provides a quick reference of available commands. this is followed by a written description of each command. three additional truth tables appear following the operation section; these tables provide current state/ next state information. command inhibit the command inhibit function prevents new commands from being executed by the sdram, regardless of whether the ck signal is enabled. the sdram is effectively deselected. operations already in progress are not affected. no operation (nop) the no operation (nop) command is used to perform a nop to an sdram which is selected (cs# is low). this prevents unwanted commands from being registered during idle or wait states. operations already in progress are not affected. load mode register the mode register is loaded via inputs a0-11. see mode register heading in the register de?nition section. the load mode register command can only be issued truth table C commands and dqm operation (note 1) name (function) cs# ras# cas# we# dqm addr i/os command inhibit (nop) h x x x x x x no operation (nop) l h h h x x x active (select bank and activate row) (3) l l h h x bank/row x read (select bank and column, and start read burst) (4) l h l h l/h 8 bank/col x write (select bank and column, and start write burst) (4) l h l l l/h 8 bank/col valid burst terminate l h h l x x active precharge (deactivate row in bank or banks) (5) l l h l x code x auto refresh or self refresh (enter self refresh mode) (6, 7) l l l h x x x load mode register (2) l l l l x op-code x write enable/output enable (8) C C C C l C active write inhibit/output high-z (8) C C C C h C high-z notes: 1. cke is high for all commands shown except self refresh. 2. a0-11 de?ne the op-code written to the mode register and a12 should be driven low. 3. a0-11 provide row address, and ba0, ba1 determine which bank is made active. 4. a0-8 provide column address; a10 high enables the auto precharge feature (nonpersistent), while a10 low disables the auto precharge feature; ba0, ba1 determine which bank is being read from or written to. 5. a10 low: ba0, ba1 determine the bank being precharged. a10 high: all banks precharged and ba0, ba1 are dont care. 6. this command is auto refresh if cke is high; self refresh if cke is low. 7. internal refresh counter controls row addressing; all inputs and i/os are dont care except for cke. 8. activates or deactivates the i/os during writes (zero-clock delay) and reads (two-clock delay).
8 white electronic designs corporation ? (602) 437-1520 ? www.wedc.com white electronic designs WEDPN4M72V-xbx april, 2004 rev. 15 white electronic designs corp. reserves the right to change products or speci?cations without notice. later; if the dqm signal was registered low, the i/os will provide valid data. write the write command is used to initiate a burst write access to an active row. the value on the ba0, ba1 inputs selects the bank, and the address provided on inputs a0-7 selects the starting column location. the value on input a10 determines whether or not auto precharge is used. if auto precharge is selected, the row being accessed will be precharged at the end of the write burst; if auto precharge is not selected, the row will remain open for subsequent accesses. input data appearing on the i/os is written to the memory array subject to the dqm input logic level appearing coincident with the data. if a given dqm signal is registered low, the corresponding data will be written to memory; if the dqm signal is registered high, the corresponding data inputs will be ignored, and a write will not be executed to that byte/column location. precharge the precharge command is used to deactivate the open row in a particular bank or the open row in all banks. the bank(s) will be available for a subsequent row access a speci?ed time (t rp ) after the precharge command is issued. input a10 determines whether one or all banks are to be precharged, and in the case where only one bank is to be precharged, inputs ba0, ba1 select the bank. otherwise ba0, ba1 are treated as dont care. once a bank has been precharged, it is in the idle state and must be activated prior to any read or write commands being issued to that bank. auto precharge auto precharge is a feature which performs the same individual-bank precharge function described above, without requiring an explicit command. this is accomplished by using a10 to enable auto precharge in conjunction with a speci?c read or write command. a precharge of the bank/row that is addressed with the read or write command is automatically performed upon completion of the read or write burst, except in the full-page burst mode, where auto precharge does not apply. auto precharge is nonpersistent in that it is either enabled or disabled for each individual read or write command. auto precharge ensures that the precharge is initiated at the earliest valid stage within a burst. the user must not issue another command to the same bank until the precharge time (t rp ) is completed. this is determined as if an explicit precharge command was issued at the earliest possible time. burst terminate the burst terminate command is used to truncate either ?xed-length or full-page bursts. the most recently registered read or write command prior to the burst terminate command will be truncated. auto refresh auto refresh is used during normal operation of the sdram and is analagous to cas#-before-ras# (cbr) refresh in conventional drams. this command is nonpersistent, so it must be issued each time a refresh is required. the addressing is generated by the internal refresh controller. this makes the address bits dont care during an auto refresh command. the 64mb sdram requires 4,096 auto refresh cycles every refresh period (t ref ), regardless of width option. providing a distributed auto refresh command will meet the refresh requirement and ensure that each row is refreshed. alternatively, 4,096 auto refresh commands can be issued in a burst at the minimum cycle rate (t rc ), once every refresh period (t ref ). self refresh* the self refresh command can be used to retain data in the sdram, even if the rest of the system is powered down. when in the self refresh mode, the sdram retains data without external clocking. the self refresh command is initiated like an auto refresh command except cke is disabled (low). once the self refresh command is registered, all the inputs to the sdram become dont care, with the exception of cke, which must remain low. once self refresh mode is engaged, the sdram provides its own internal clocking, causing it to perform its own auto refresh cycles. the sdram must remain in self refresh mode for a minimum period equal to t ras and may remain in self refresh mode for an inde?nite period beyond that. the procedure for exiting self refresh requires a sequence
9 white electronic designs corporation ? (602) 437-1520 ? www.wedc.com white electronic designs WEDPN4M72V-xbx april, 2004 rev. 15 white electronic designs corp. reserves the right to change products or speci?cations without notice. of commands. first, ck must be stable (stable clock is de?ned as a signal cycling within timing constraints specified for the clock pin) prior to cke going back high. once cke is high, the sdram must have nop commands issued (a minimum of two clocks) for t xsr , because time is required for the completion of any internal absolute maximum ratings parameter unit voltage on v cc supply relative to v ss -1 to 4.6 v voltage on nc or i/o pins relative to v ss -1 to 4.6 v operating temperature ta (mil) -55 to +125 c operating temperature ta (ind) -40 to +85 c storage temperature, plastic -55 to +150 c note: stress greater than those listed under "absolute maximum ratings" may cause per manent 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 in dicated in the operational sections of this speci?cation is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. capacitance (note 2) parameter symbol max unit input capacitance: ck ci1 7.0 pf addresses, ba0-1 input capacitance ca 30 pf input capacitance: all other input-only pins ci2 7.0 pf input/output capacitance: i/os c io 10.0 pf thermal resistance description symbol max unit thermal resistance: die junction to ambient ja 15.8 c/w thermal resistance: die junction to ball jb 10.8 c/w thermal resistance: die junction to case jc 6.0 c/w note: refer to application note pbga thermal resistance corrleation for further information regarding wedcs thermal modeling. refresh in progress. upon exiting the self refresh mode, auto refresh commands must be issued as both self refresh and auto refresh utilize the row refresh counter. *self refresh available in commercial and industrial temperatures only.
10 white electronic designs corporation ? (602) 437-1520 ? www.wedc.com white electronic designs WEDPN4M72V-xbx april, 2004 rev. 15 white electronic designs corp. reserves the right to change products or speci?cations without notice. dc electrical characteristics and operating conditions (notes 1, 6) v cc = +3.3v 0.3v; -55c ? t a ? +125c parameter/condition symbol min max units supply voltage v cc 3 3.6 v input high voltage: logic 1; all inputs (21) v ih 2 v cc + 0.3 v input low voltage: logic 0; all inputs (21) v il -0.3 0.8 v input leakage current: any input 0v v in v cc (all other pins not under test = 0v) i i -5 5 a input leakage address current (all other pins not under test = 0v) i i -25 25 a output leakage current: i/os are disabled; 0v ? v out ? v ccq i oz -5 5 a output levels: output high voltage (i out = -4ma) output low voltage (i out = 4ma) v oh 2.4 C v v ol C 0.4 v icc specifications and conditions (notes 1, 6, 11, 13) v cc = +3.3v 0.3v; -55c ? t a ? +125c parameter/condition symbol max units operating current: active mode; burst = 2; read or write; t rc = t rc (min); cas latency = 3 (3, 18, 19) i cc1 575 ma standby current: active mode; cke = high; cs# = high; all banks active after t rcd met; no accesses in progress (3, 12, 19) i cc3 225 ma operating current: burst mode; continuous burst; read or write; all banks active; cas latency = 3 (3, 18, 19) i cc4 700 ma self refresh current: cke ? 0.2v (27) i cc7 5 ma
11 white electronic designs corporation ? (602) 437-1520 ? www.wedc.com white electronic designs WEDPN4M72V-xbx april, 2004 rev. 15 white electronic designs corp. reserves the right to change products or speci?cations without notice. parameter symbol -100 -125 unit min max min max access time from ck (pos. edge) cl = 3 t ac 7 6 ns cl = 2 t ac 7 6 ns address hold time t ah 1 1 ns address setup time t as 2 2 ns ck high-level width t ch 3 3 ns ck low-level width t cl 3 3 ns clock cycle time (22) cl = 3 t ck 10 8 ns cl = 2 t ck 13 10 ns cke hold time t ckh 1 1 ns cke setup time t cks 2 2 ns cs#, ras#, cas#, we#, dqm hold time t cmh 1 1 ns cs#, ras#, cas#, we#, dqm setup time t cms 2 2 ns data-in hold time t dh 1 1 ns data-in setup time t ds 2 2 ns data-out high-impedance time cl = 3 (10) t hz 7 6 ns cl = 2 (10) t hz 7 6 ns data-out low-impedance time t lz 1 1 ns data-out hold time (load) t oh 3 3 ns data-out hold time (no load) (26) t oh n 1.8 1.8 ns active to precharge command t ras 50 120,000 45 120,000 ns active to active command period t rc 70 70 ns active to read or write delay t rcd 20 21 ns refresh period (4,096 rows) C commercial, industrial t ref 64 64 ms refresh period (4,096 rows) C military t ref 16 16 ms auto refresh period t rfc 70 70 ns precharge command period t rp 20 20 ns active bank a to active bank b command t rrd 15 15 ns transition time (7) t t 0.3 1.2 0.3 1.2 ns write recovery time (23) t wr 1 ck + 7ns 1 ck + 7ns (24) 15 14 ns exit self refresh to active command t xsr 80 78 ns electrical characteristics and recommended ac operating characteristics (notes 5, 6, 8, 9, 11)
12 white electronic designs corporation ? (602) 437-1520 ? www.wedc.com white electronic designs WEDPN4M72V-xbx april, 2004 rev. 15 white electronic designs corp. reserves the right to change products or speci?cations without notice. notes: 1. all voltages referenced to v ss . 2. this parameter is not tested but guaranteed by design. f = 1 mhz, t a = 25c. 3. i dd is dependent on output loading and cycle rates. speci?ed values are obtained with minimum cycle time and the outputs open. 4. enables on-chip refresh and address counters. 5. the minimum speci?cations are used only to indicate cycle time at which proper operation over the full temperature range is ensured. 6. an initial pause of 100ms is required after power-up, followed by two auto refresh commands, before proper device operation is ensured. (v cc must be powered up simultaneously.) the two auto refresh command wake-ups should be repeated any time the t ref refresh requirement is exceeded. 7. ac characteristics assume t t = 1ns. 8. in addition to meeting the transition rate speci?cation, the clock and cke must transit between v ih and v il (or between v il and v ih ) in a monotonic manner. 9. outputs measured at 1.5v with equivalent load: 10. t hz de?nes the time at which the output achieves the open circuit condition; it is not a reference to v oh or v ol . the last valid data element will meet t oh before going high-z. 11. ac timing and i dd tests have v il = 0v and v ih = 3v, with timing referenced to 1.5v crossover point. 12. other input signals are allowed to transition no more than once every two clocks and are otherwise at valid v ih or v il levels. 13. i cc speci?cations are tested after the device is properly initialized. 14. timing actually speci?ed by t cks ; clock(s) speci?ed as a reference only at minimum cycle rate. 15. timing actually speci?ed by t wr plus t rp ; clock(s) speci?ed as a reference only at minimum cycle rate. 16. timing actually speci?ed by t wr . 17. required clocks are speci?ed by jedec functionality and are not dependent on any timing parameter. 18. the i cc current will decrease as the cas latency is reduced. this is due to the fact that the maximum cycle rate is slower as the cas latency is reduced. 19. address transitions average one transition every two clocks. 20. ck must be toggled a minimum of two times during this period. 21. v ih overshoot: v ih (max) = v cc + 2v for a pulse width ? 3ns, and the pulse width cannot be greater than one third of the cycle rate. v il undershoot: v il (min) = -2v for a pulse width ? 3ns. 22. the clock frequency must remain constant (stable clock is de?ned as a signal cycling within timing constraints speci?ed for the clock pin) during access or precharge states (read, write, including t wr , and precharge commands). cke may be used to reduce the data rate. 23. auto precharge mode only. the precharge timing budget (t rp ) begins 7.5ns/7ns after the ?rst clock delay, after the last write is executed. 24. precharge mode only. 25. jedec and pc100 specify three clocks. 26. parameter guaranteed by design. 27. self refresh available in commercial and industrial temperatures only. ac functional characteristics (notes 5,6,7,8,9,11) parameter/condition symbol -100 -125 units read/write command to read/write command (17) t ccd 1 1 t ck cke to clock disable or power-down entry mode (14) t cked 1 1 t ck cke to clock enable or power-down exit setup mode (14) t ped 1 1 t ck dqm to input data delay (17) t dqd 0 0 t ck dqm to data mask during writes t dqm 0 0 t ck dqm to data high-impedance during reads t dqz 2 2 t ck write command to input data delay (17) t dwd 0 0 t ck data-in to active command (15) t dal 4 5 t ck data-in to precharge command (16) t dpl 2 2 t ck last data-in to burst stop command (17) t bdl 1 1 t ck last data-in to new read/write command (17) t cdl 1 1 t ck last data-in to precharge command (16) t rdl 2 2 t ck load mode register command to active or refresh command (25) t mrd 2 2 t ck data-out to high-impedance from precharge command (17) cl = 3 t roh 3 3 t ck cl = 2 t roh 2 t ck q 50pf
13 white electronic designs corporation ? (602) 437-1520 ? www.wedc.com white electronic designs WEDPN4M72V-xbx april, 2004 rev. 15 white electronic designs corp. reserves the right to change products or speci?cations without notice. not recommended* package 735: 219 plastic ball grid array (pbga) all linear dimensions are millimeters and parenthetically in inches bottom view 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 t r p n m l k j h g f e d c b a 219 x ?0.762 (0.030) nom 1.27 (0.050) nom 25.1 (0.988) max 19.05 (0.750) nom 21.1 (0.831) max 19.05 (0.750) nom 2.03 (0.080) max 0.61 (0.024) nom * this product is not recommended for new designs , refer to WEDPN4M72V-xb2x for new designs.
14 white electronic designs corporation ? (602) 437-1520 ? www.wedc.com white electronic designs WEDPN4M72V-xbx april, 2004 rev. 15 white electronic designs corp. reserves the right to change products or speci?cations without notice. not recommended* ordering information white electronic designs corp. plastic sdram configuration, 4m x 72 3.3v power supply frequency (mhz) 100 = 100mhz 125 = 125mhz package: b = 219 plastic ball grid array (pbga) device grade: m = military -55c to +125c i = industrial -40c to +85c c = commercial 0c to +70c wed p n 4m 72 v - xxx b x * this product is not recommended for new designs , refer to WEDPN4M72V-xb2x for new designs.

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