HSTL (High Speed Transceiver Logic) is a circuit logic standard formally formulated by JEDEC (Joint Electron Device Engineering Council, belonging to the Electronic Industry Association EIA) in 1995.
HSTL is a technology-independent digital integrated circuit interface standard, developed to achieve voltage expansion and technology-independent I/O structure.
The I/O structure required by this standard is a differential amplified input (an input is internally associated with a user-supplied input reference voltage, which is used for single-ended input) and an output using Vcco. The so-called technical independence actually refers to the voltage used for input reference and output Vcco, which is different from the power supply voltage of the device itself.
The main application of HSTL is that it can be used to read and write high-speed memories. The traditional slow memory access time hinders the operation of high-speed processors. In the intermediate frequency region (between 100MHz and 180MHz), I/O structures based on single-ended signals are available: HSTL, GTL/GTL+, SSTL, and low-voltage TTL (LVTTL). In the range above 180MHz, the HSTL standard is the only single-ended I/O interface available. Using the speed of HSTL, the fast I/O interface significantly improves the performance of the entire system. HSTL is an I/O interface choice for high-speed memory applications, and it also perfectly provides the ability to drive multiple memory module address buses.
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