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.
Two voltage levels for SSTL are defined:
- SSTL-2, 2.5 V, defined in EIA/JESD8-9B 2002
- SSTL-3, 3.3 V, defined in EIA/JESD8-8 1996
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).