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  • 知乎 - 有问题，就会有答案
    知乎 - 有问题，就会有答案
  • 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)
  • 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
  • 问一下大家什么是USB转TTL？ - 知乎
    USB转TTL是一种 串口通信 转换器，它可以将USB接口转换为TTL串口通信接口。 TTL串口通信是一种常见的数字通信方式，常用于单片机、传感器等设备之间的数据传输。 通过USB转TTL转换器，可以将计算机的USB接口与TTL串口设备连接起来，实现数据的传输和通信。 常见的USB转TTL芯片有 CH340 、 CP2102 等。
  • Wiring for 5 V TTL signal via 3. 3 V UART to Ethernet adapter
    That display has a 5 V TTL output for the readings, that I want to convert to Ethernet using a (3 3 V) UART TO ETH adapter from Waveshare to eventually use in my home automation server in another room
  • 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
  • TTL电路 - 知乎
    TTL电路是晶体管-晶体管逻辑电路的英文缩写（Transister-Transister-Logic ），是数字集成电路的一大门类。它采用双极型工艺制造，具有高速度和品种多等特点。
  • Unused inputs and outputs on 74 series TTL logic chips
    FWIW, TTL inputs naturally "float" high If you want to drive an input low, you do it by pulling current from the input pin, but when you drive an input high, there is little or no current The takeaway: If you have an input pin whose state does not matter—the circuit will work whether it is held high or held low—then hold it high Your circuit will use less power that way
  • When is it appropriate to mix 74LSxx components with original TTL 74xx?
    The TTL-based 74 series have logic levels concentrated around the low end of the supply voltage, while the CMOS ones (other than the xxT CMOS series) have logic levels spread more completely throughout the supply range This means that a 74LS driving a 74HC, for instance, might not be able to drive the HC's input to a point that would read as high





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