I've been trying to find a good description of the TTL serial "standard" without much luck. I understand that serial transmit (TX) and receive (RX) lines idle high (at VCC) and that they …

Mar 8, 2024 · 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 …

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.

Sep 18, 2021 · Placing an invertor in-line will change tje signal to what normal TTL level UART receiver expects. History lesson: The reason for idle level being H is to detect that the …

Feb 18, 2023 · I need to implement a TTL to RS485 converter into an home made project and searching by Google I found this module with related schematics: Could you help me by …

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 …

I am planning to use this UART-to-RS485 module. This module is bidirectional and uses a single pair of differential signal to transmit/receive data. My question is how does the chip decide …

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 …

Mar 21, 2018 · What is the difference of these two ttl nand gates? What is a totem pole, what does it do and what is it used for? When connecting multiple ttl logic gates together is it better …

Feb 25, 2025 · Unsurprisingly, since we know that TTL pull-down needs to sink current from the input while a pull-up doesn't, the required TTL pull-down resistor value is smaller than the pull …