HC4538 Monostable Multivibrator in VHDL?

Hello, I'm new to VHDL and trying to model the chip hc4538. As can be seen in the datasheet, the output's pulse length is determined by Tau once the Vref is reached. I'm not exactly sure how to account for that in VHDL since it uses external components. Is it actually necessary to account for that? I've attached my code thus far.
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