Stub Series Terminated Logic

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Stub Series Terminated Logic (SSTL) devices are a family of electronic devices for driving transmission lines. They are specifically designed for driving the DDR (double-data-rate) SDRAM modules used in computer memory.

Three voltage levels for SSTL are defined:

  • SSTL_3, 3.3 V, defined in EIA/JESD8-8 1996
  • SSTL_2, 2.5 V, defined in EIA/JESD8-9B 2002
  • SSTL_18, 1.8 V, defined in EIA/JESD8-15

Terminations can be Class I (one series resistor at the source and one parallel resistor at the load) or Class II (one series resistor at the source and two parallel resistors, one at each end).

See also HSTL (High-Speed Transceiver Logic).

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