K4H640438B-TCB0中文资料三星数据手册PDF规格书

特性 Features

• 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 2, 2.5 (clock)

-. 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/DM for write masking only

• Auto & Self refresh

• 15.6us refresh interval(4K/64ms refresh)

• Maximum burst refresh cycle : 8

• 66pin TSOP II package