DRAMs Parts and Modules

ISSI"s 256Mb Synchronous DRAM achieves high-speeddata transfer using pipeline architecture. The 256Mb SDRAM is organized in 2Meg x 32 bit x 4Banks.

• Clock frequency: 166, 143 MHz
• Fully synchronous; all signals referenced to a positive clock edge
• Internal bank for hiding row access/precharge
• Single Power supply: 3.3V + 0.3V
• LVTTL interface
• Programmable burst length
  • (1, 2, 4, 8, full page)
• Programmable burst sequence: Sequential/Interleave
• Auto Refresh (CBR)
• Self Refresh
• 4096 refresh cycles every 16ms (A2 grade) or 64 ms (Commercial, Industrial, A1 grade)
• Random column address every clock cycle
• Programmable CAS\ latency (2, 3 clocks)
• Burst read/write and burst read/single write operations capability
• Burst termination by burst stop and precharge