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EDD2508AKTA-5 Datasheet(PDF) 1 Page - Elpida Memory |
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EDD2508AKTA-5 Datasheet(HTML) 1 Page - Elpida Memory |
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1 / 48 page  Document No. E0349E60 (Ver. 6.0) Date Published February 2005 (K) Japan Printed in Japan URL: http://www.elpida.com Elpida Memory, Inc. 2003-2005 PRELIMINARY DATA SHEET 256M bits DDR SDRAM EDD2508AKTA-5 (32M words × 8 bits, DDR400) Description The EDD2508AKTA-5 is a 256M bits DDR SDRAM organized as 8,388,608 words × 8 bits × 4 banks. Read and write operations are performed at the cross points of the CK and the /CK. This high-speed data transfer is realized by the 2 bits prefetch-pipelined architecture. Data strobe (DQS) both for read and write are available for high speed and reliable data bus design. By setting extended mode register, the on-chip Delay Locked Loop (DLL) can be set enable or disable. It is packaged in 66-pin plastic TSOP (II). Features • Power supply: VDDQ = 2.6V ± 0.1V : VDD = 2.6V ± 0.1V • Data rate: 400Mbps (max.) • Double Data Rate architecture; two data transfers per clock cycle • Bi-directional, data strobe (DQS) is transmitted /received with data, to be used in capturing data at the receiver • Data inputs, outputs, and DM are synchronized with DQS • 4 internal banks for concurrent operation • DQS is edge aligned with data for READs; center aligned with data for WRITEs • Differential clock inputs (CK and /CK) • DLL aligns DQ and DQS transitions with CK transitions • Commands entered on each positive CK edge; data and data mask referenced to both edges of DQS • Data mask (DM) for write data • Auto precharge option for each burst access • SSTL_2 compatible I/O • Programmable burst length (BL): 2, 4, 8 • Programmable /CAS latency (CL): 3 • Programmable output driver strength: normal/weak • Refresh cycles: 8192 refresh cycles/64ms 7.8µs maximum average periodic refresh interval • 2 variations of refresh Auto refresh Self refresh Pin Configurations /xxx indicates active low signal. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 (Top view) VDD DQ0 VDDQ NC DQ1 VSSQ NC DQ2 VDDQ NC DQ3 VSSQ NC NC VDDQ NC NC VDD NC NC /WE /CAS /RAS /CS NC BA0 BA1 A10(AP) A0 A1 A2 A3 VDD VSS DQ7 VSSQ NC DQ6 VDDQ NC DQ5 VSSQ NC DQ4 VDDQ NC NC VSSQ DQS NC VREF VSS DM /CK CK CKE NC A12 A11 A9 A8 A7 A6 A5 A4 VSS Address input Bank select address Data-input/output Input and output data strobe Chip select Row address strobe command Column address strobe command Write enable Input mask Clock input Differential clock input Clock enable Input reference voltage Power for internal circuit Ground for internal circuit Power for DQ circuit Ground for DQ circuit No connection A0 to A12 BA0, BA1 DQ0 to DQ7 DQS /CS /RAS /CAS /WE DM CK /CK CKE VREF VDD VSS VDDQ VSSQ NC 66-pin Plastic TSOP(II) |
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