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Chip main level of the following interfaces: TTL (LVTTL), CMOS, ECL, PECL, LVPECL,, LVDS, PECL, LVPECL, LVDS applications in high-speed chip interfaces, different level is not directly interconnected need the chip level conversion circuit and converted to understand the level of structure and performance parameters on the analysis of the circuit is very necessary beneficial This article is from the various performance parameters of the level signal, combined with reference data on electricity The level signal interconnect introduce.