DRAM - What is CAS Latency ?

CAS Latency (CL) stands for Column Address Strobe. This is the number of clock cycles that pass from when an instruction is given for a particular column and the moment the data is available. In general the lower the CAS latency the better within a given memory technology (DDR, DDR2 or DDR3). Typical values are;

  • DDR -  2.5, 3 Cycles
  • DDR2 - 3, 4, 5, 6 Cycles
  • DDR3 - 7, 9  Cycles

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