I am trying to control RGB LEDs using 74HC595s. Three of them determine the input voltage and one of them determines the ground.
Here is what I found while seeing the answers to a slightly similar question
The 74LS04 have internal resistors to reduce the shoot-thru current. When that pin is driven high, the Vbe and Resistor limit the current. Is that resistor designed for permanent heating? Those pins are short-circuit-proof
I want to connect the two 74595 together with a LED in between without a current limiting resistor since I believe the buffers have an internal resistor connected to the upper MOSFET in the totem pole
- Max current = 25mA
- Typ. Vforward R = 1.95V
- Typ. Vforward G = 3.3V
- Typ. Vforward B = 3.3V
I have searched through the documentation but none of them shows the internal structure. What is your opinion about not using the current limiting resistor?