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  • what is it TTL which shows on ping report and the value its showing . . .
    If the TTL value started at, say, 128 and you see a value of 28, then there were 100 hops between the system where the packet originated and the final destination My guess is that the initial TTL for the ping packets was 255, so the first ping traversal took 200 hops and the second took 9
  • digital logic - What is meant by TTL in this context? - Electrical . . .
    Additionally, a user might think that a high signal means "100%", and that a low signal means "0% " Depending on the specific TTL driver, this is not true because of the effective voltages The Chapter "CHANGE THE ANALOG INPUT MODULATION TRANSFER FUNCTION" on page 15 of the linked data sheet shows an example control circuit
  • Does TTL need to be set to 3600 for MX record? - Microsoft Community
    But the domain is still not getting verified I've hit the refresh button on the 'Domain Settings' page too but to no avail The only issue I'm having is that my domain host does not allow TTL values less than 14400 (4 hours) Thus I'm unable to set the TTL value specified in the instructions on the 'Domain Settings' page - 3600
  • Why was so much TTL logic design negative true?
    TTL had more active-low inputs because it was easier to do within the TTL structure From: Designing with TTL Integrated Circuits: 1971, Morris, Miller Figure 1 13 is the basic circuit of a TTL NAND gate A single multi-emitter transistor replaces input diodes and the series diode of DTL Each emitter-base diode serves as one input, and the
  • USART, UART, RS232, USB, SPI, I2C, TTL, etc. what are all of these and . . .
    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 With respect to the internal levels the levels on the RS-232 line are inverted, +12V corresponds to logical low and -12V corresponds to logical high, which can be confusing
  • TTL NAND gate analysis - Electrical Engineering Stack Exchange
    TTL gates are the successor of DTL gates; so the best way to explain TTL is through DTL as @G36 did in their answer The common thing in both families is that the input logic variables control electronic switches - diodes in DTL, and transistors in TTL
  • microcontroller - How does TTL serial work? - Electrical Engineering . . .
    Which would be different if it were really TTL, as in your question (the microcontroller is HCMOS) TTL outputs are highly asymmetrical: they can only supply little current, typically 0 4mA Sinking current is OK, at 8mA The low source current may be a problem if the line has a high capacitance and is high speed
  • uart、串口、COM口、USB口，ttl，rs232,rs485这几个到底是啥关系？ - 知乎
    ttl：ttl指双极型三极管逻辑电路，也可以指一种电平规范（类似的还有cmos电平等）。淘宝上很多“usb转ttl”模块，实际上是“usb转ttl电平的串口模块”。这种信号0对应0v，1对应3 3v或者5v。与单片机、soc的io电平兼容。
  • 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 But the "proper" definition of RS-232 used a rather HIGHER and BIPOLAR voltages to define zero and one
  • logic gates - Tying open-collector outputs to TTL inputs - Electrical . . .
    Furthermore, the noise margin is really small Typically the TTL input only gets pulled only slightly above the threshold voltage, not up to the supply voltage In this case somewhere around 2 7 V, compared to the 2 0 V minimum guaranteed high input voltage With a pull-up resistor the input will go up to the supply voltage, typically 5 V





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