Many devices such as laser modules have BNC sync outputs specified as TTL. As far as I know, TTL output can be made using CMOS. TTL has specified voltage HIGH and LOW levels. In the datasheets of s...
Tying multiple TTL NAND inputs together actually uses current than tying the unused inputs high since there's a single base resistor on the single transistor multi-emitter inputs.
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 can only directly drive TTL compatible, low-threshold CMOS inputs - as found in the 74HCT and 74ACT logic familes, for example. On the other hand, the anode-side LED load, as you found out, is useful for adapting TTL outputs to CMOS 3.3V inputs :)
transistors - Experiment for driving LED with TTL output - Electrical ...
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.
USART, UART, RS232, USB, SPI, I2C, TTL, etc. what are all of these and ...
How should I use this word ? Deadline required by the agreement expired. or Deadline required by the agreement is/was(?) expired. What is the correct usage ? if both are correct grammatically, ...