Common logic levels are: TTL, COMS, ECL, PECL, GTL, LVDS, and so on. Each level has specific requirements for input and output, which means it can distinguish between 0 and 1. The above several levels of standards are not detailed, focusing on some considerations for interconnecting devices with different logic levels:
1. Level relationship: Each logic level has its own judgment standard for 0 and 1. Therefore, it must be guaranteed to work within the normal level range. Otherwise, it will not work properly, and it will burn the chip seriously.
2. Drive capability: It is necessary to carefully analyze and calculate the electrical characteristic parameters of the device and select a reasonable driving capability. Otherwise, the system may be unstable due to fluctuations in power supply or interference.
3, delay characteristics: Especially when the logic level conversion between high-speed signals, we must pay attention to the delay characteristics to ensure that the design has sufficient tolerance.
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