ds_k4h5608_1638d_rev11-1

leopard

256Mb D-die DDR400 SDRAM Specification




• 200MHz Clock, 400Mbps data rate.
• VDD= +2.6V + 0.10V, VDDQ= +2.6V + 0.10V
• Double-data-rate architecture; two data transfers per clock cycle
• Bidirectional data strobe(DQS)
• Four banks operation
• Differential clock inputs(CK and CK)
• DLL aligns DQ and DQS transition with CK transition
• MRS cycle with address key programs
-. Read latency 3 (clock) for DDR400 , 2.5 (clock) for DDR333
-. Burst length (2, 4, 8)
-. Burst type (sequential & interleave)
• All inputs except data & DM are sampled at the positive going edge of the system clock(CK)
• Data I/O transactions on both edges of data strobe
• Edge aligned data output, center aligned data input
• LDM,UDM for write masking only (x16)
• DM for write masking only (x8)
• Auto & Self refresh
• 7.8us refresh interval(8K/64ms refresh)
• Maximum burst refresh cycle : 8
• 66pin TSOP II package





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