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  • TTL在ping命令中代表什么? - 知乎
    TTL:生存时间,主要用于三层数据的防环,TTL在 IPv4包头 中携带,共8个bit位,最大值255,每经过一个三层设备就减一,为零后丢弃该数据包。
  • Does TTL output specify the maximum current it can source?
    TTL-compatible inputs and outputs can be made with CMOS structures If you look at the datasheets for a 74HC04 and 74HCT04, you will see the different input voltage ranges AND - to your specific question - No These days, when a component or device specifies a TTL output, it is referring to the voltage levels only
  • How does TTL serial work? - Electrical Engineering Stack Exchange
    Point of terminology: "TTL serial" is a severely over-broad term, " (point-to-point) asynchronous serial (at TTL levels)" seems to be what you're asking about (Though that's still probably lacking, but at least better)
  • ttl 计算机网络是什么? - 知乎
    知乎,中文互联网高质量的问答社区和创作者聚集的原创内容平台,于 2011 年 1 月正式上线,以「让人们更好的分享知识、经验和见解,找到自己的解答」为品牌使命。知乎凭借认真、专业、友善的社区氛围、独特的产品机制以及结构化和易获得的优质内容,聚集了中文互联网科技、商业、影视
  • 什么叫TTL电平? - 知乎
    TTL电平信号被利用的最多是因为通常数据表示采用二进制规定,+5V等价于逻辑"1",0V等价于逻辑"0",这就被称做TTL (晶体管-晶体管逻辑电平)信号系统,这是计算机处理器控制的设备内部各部分之间通信的标准技术。
  • digital logic - What is meant by TTL in this context? - Electrical . . .
    TTL requires that logic 1 input must be at least 2V, and TTL drivers are designed to guarantee that That is far short of what this driver requires to register as logic 1
  • USART, UART, RS232, USB, SPI, I2C, TTL, etc. what are all of these and . . .
    TTL mean Transistor-Transistor-Logic and has its level for logical zero near 0V and for logical one near 5V Often any 5V logic is called TTL, although most circuits nowadays are built as CMOS Today there are also many circuits that work at 3 3V, which is no longer TTL
  • 当TTL等于1时经过的最大路由个数为0,当TTL等于255时,能经过的路由器个数为255,为什么? - 知乎
    因为每经过一个路由器路由器会将ttl减1后发给下一跳,当ttl等于0路由器会丢弃该IP包。 所以ttl等于1时,路由器收到该包,减1,为0丢弃。 即路由器接收该包但不进行转发了,ttl=1实际也是能用于直连的。 直连的对端路由器如果算经过那是1,直连不算经过那算0。
  • rs232 - What is the difference between RS-232 and TTL UART . . .
    A TTL UART will output (and input) only TTL levels, essentially 0 bit = 0V and 1 bit = 5V And many modern-day gadgets (Arduino, et al ) simply use TTL voltage levels for serial communication
  • 域名解析中“TTL”是什么意思? - 知乎
    在域名解析中,"TTL" 代表 "Time To Live"(生存时间)。它是一个设置值,用来指定域名系统(DNS)中一个特定的记录在DNS缓存中可以存留多长时间,直到它过期并需要从权威源再次获取更新的信息。 TTL的作用: 缓存管理: TTL值告诉其他服务器(例如用户的ISP或企业网络中的DNS服务器)该缓存该DNS记录





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