Timing Speed
     The speed rating marked on each chip (10ns, 50ns, 60ns, 70ns, 80ns or 100ns) signifies how long it takes for the read/write to occur. A chip with a lower number is usually better because it is faster; however, early systems often need slower speeds. If you are upgrading Memory in a computer, always match the speed of modules within the same bank.
A nanosecond (ns or nsec) is = 10-9 one billionth of a second.

Important Timing Terms:
  1. tRP - The time required to switch internal memory banks. (RAS Precharge)
  2. tRCD - The time required between /RAS (Row Address Select) and /CAS (Column Address Select) access.
  3. tAC - The amount of time necessary to "prepare" for the next output in burst mode.
  4. tCAC - The Column Access Time.
  5. tCL - (or CL) CAS Latency.
  6. tCLK - The Length of a Clock Cycle.
  7. RAS - Row Address Strobe or Row Address Select.
  8. CAS - Column Address Strobe or Column Address Select.
  9. Read Cycle Time - The time required to make data ready by the next clock cycle in burst mode.

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Last Update: 10:21 AM 11/18/02