TTL是TimeToLive的缩写，该字段指定IP包被路由器丢弃之前允许通过的最大网段数量。TTL是IPv4报头的一个8bit字段。
This device contains six independent buffers each of whichperforms the logic INVERT function.
This device contains four independent gates each of whichperforms the logic NAND function. Th
These positive-edge triggered flip-flops utilize TTL circuitryto implement D-type flip-flop l
These positive-edge triggered flip-flops utilize TTL circuitry toimplement D-type flip-flop l
This device contains four independent gates each of whichperforms the logic NAND function. Ea
These 8-bit shift registers feature gated serial inputs andan asynchronous clear. A LOW logic le
专辑类-器件数据手册专辑-120册-2.15G 标准集成电路数据手册-TTL电路-795页-12.5M.pdf