Problem with Multisim: Async signal not support on 74ALS74AN?

A simple scheme to test 74ALS74AN.

Q PIN is connected to the pin D and pine CLR is control by a switch.

But the logic of 7474 is false:

When J1 is enabled, CLR # is Lo, 7474 must be output Q = 0, but why Multisim report it as a divider?

Similarly, when J1 is disabled, CLR, 7474 must be output Q = D #(comme un diviseur), why the report of exit Multisim D = 1.

Is this a bug with Mutlisim?

Jumblo.Lee,

The asynchronous Reset (clear) and the preset PIN is active BASS in this component. Your Preset is left floating and is, in fact, be interpreted as a WEAKNESS. So when J1 is closed, Reset and Preset are active, a dangerous condition you want to avoid in the circuits of lock and Flip-Flip. It turns out that this element does not take into account these asynchronous pins under this condition. So, you see the output of normal clock divider.

To solve the problem, just attach the Preset PIN to a SUMMIT.

Kind regards

Tags: NI Software

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