Because the bipolar SE/NE 555/556 devices produce large crowbar currents in the output driver, it is necessary to decouple the power supply lines with a good capacitor close to the device. However, it is possible to effect economies in the external component count using the ICM7555 and ICM7556. Perhaps there is some requirement for wiring the other 555 timer models just like you sometimes are required to shunt a capacitor in PSpice in order to resolve a floating net error. direct replacements for the SE/NE 555/556 devices. Moreover, since the 555B was the exact timer model used in a PSpice example for timers, I also suspect that there is a good reason to use the 555B in simple timer circuits. I suspect this because I tried to replace the TLC555/TI with a 555B and the Lite version told me that I exceeded the limitation of the Lite version. I suspect that the TLC555/TI may be quite different in its simulation behavior than the 555B, 555C or 555D/EVAL. However, the question I wish to ask is whether the various 555 PSpice timer models vary in simulation characteristics.
Of course, you would need to see my circuit to pinpoint an error. However, I do not get any measurable signal at the output of the 555. I successfully ran a simulation with differential markers at the input. I have created a circuit built around the 555 timer using the TLC555/TI. I am using OrCAD Capture and PSpice 17.2-2016 (Lite).
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