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SN74LS02: Simulation issue: SN74LS02 gate rise- and fall-times depends on input frequency

Part Number: SN74LS02

Hello,

at first: I'm a newbie in doing digital simulation with TINA. So sorry for this (perhaps) silly question :)

I encountered the following issue in a complex circuit, but I could reduce it to this simple circuit:

Generator settings:

Simulation result:


 The result is what I expexted. After this, I changed the pulse-on/-off time from 10µs to 1ms of the generator, but NOT the rise-/fall-time:


Simulation result:



The fall time of the gate output increases to ~130ns, the rise time of the generator ist the same setting as before ~5ns.

What have I made wrong or forgotten ?
BTW: the settings of the logic gate are not changed by myself.

Regards,

Gerd