IS43DR32801A

IS43DR32800A, IS43/46DR32801A 8Mx32 256Mb DDR2 DRAM PRELIMINARY INFORMATION SEPTEMBER 2010 FEATURES Vdd = 1.8V ±0.1V, Vddq = 1.8V ±0.1V JEDEC standard 1.8V I/O (SSTL_18-compatible) Double data rate interface: two data transfers per clock cycle Differential data strobe (DQS, DQS) 4-bit prefetch architecture On chip DLL to align DQ and DQS transitions with CK 4 internal banks for concurrent operation Programmable CAS latency (CL) 3, 4, 5, and 6 supported Posted CAS and programmable additive latency (AL) 0, 1, 2, 3, 4, and 5 supported WRITE latency = READ latency - 1 tCK Programmable burst lengths: 4 or 8 Adjustable data-output drive strength, full and reduced strength options On-die termination (ODT) DESCRIPTION ISSI's 256Mb DDR2 SDRAM uses a double-data-rate architecture to achieve high-speed operation. The double-data rate architecture is essentially a 4n-prefetch architecture, with an interface designed to transfer two data words per clock cycle at the I/O balls. The 256Mb DDR2 SDRAM is provided in a wide bus x32 format, designed to offer a smaller footprint and support compact designs. ADDRESS TABLE Parameter Configuration Refresh Count Row Addressing Column Addressing Bank Addressing Precharge Addressing 8M x 32 Standard Page Size Option 2M x 32 x 4 banks 4K/64ms A0-A11 A0-A8 BA0, BA1 A10/AP 8M x 32 Reduced Page Size Option 2M x 32 x 4 banks 8K/64ms A0-A12 A0-A7 BA0, BA1 A10/AP OPTIONS Configuration: 8M x 32 (I...