![]() There might be other reasons to use pull-up/-down resistors, for example, to get a defined signal when the chips are still in reset and do not drive their outputs either way. Therefore I want to find all the relevant currents for both. So in your case, you do not need a pull-up resistor to get a correct voltage level. I am trying to analyses the operation of a TTL NAND gate with totem pole output configuration. LS is a TTL family HCT is a CMOS family that has TTL-compatible inputs. We don't know if this is important, or not, just yet. PS9715 is an optically coupled high-speed, totem pole output isolator containing a GaAIAs LED on the light emitting side. One of the first things to understand is the capability of the output, as that is what will be driving other inputs. The high or low level is determined without setting pull-up. Text is available under the Creative Commons Attribution-ShareAlike License 3.0 additional terms may. Totempole output has an output circuit with two transistors combined between VCC and GND. Simulate this circuit – Schematic created using CircuitLab This page was last edited on 28 July 2008, at 14:57 (UTC). Let me draw out the schematic using the editor (you should have done this, too.) ![]()
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