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。

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 …

Jun 22, 2023 · 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.

Aug 14, 2012 · 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 …

此外，增量编码器的信号输出电平标准也是多样的，常见的有TTL、HTL、PNP和NPN等。 TTL和HTL是常见的电平标准，其中TTL为长线差分驱动，而HTL也称为推拉式或推挽式输出，适用 …

Mar 10, 2018 · I've been having some issues lately with the usage of 10k ohm resistors as pull down resistors for 74ls series chips. Most people seem to choose 10k resistors as their default …

Sep 11, 2020 · I keep coming back here searching for an RC-based negative edge detector for TTL levels, that generates a negative pulse on a falling edge. The only place I find this solution …

TTL integrated circuits assume unconnected inputs to be at logic 1 because the main requirement for driving a TTL input is to pull-down the level to near 0 V which takes about 1 mA per input. …

Jun 22, 2022 · TTL solution with active low input and output. R and C are calculated for 2ms output pulse width. simulate this circuit – Schematic created using CircuitLab

Jul 2, 2023 · I'd like to connect them together through a Serial connection (UART TTL) at baud rate 460800. Both devices have 3.3V UART GPIO but also a 5V output that can be used. …