Original question:
Hello,
We are using the SN74AUP1G125 device in our design and query is related to input rise time constraint on OE pin.
We are using RC based delay circuit to control the OE pin of SN74AUP1G125 device and rise time is ~33usecond. Is it fine or any restrictions are there for rise time of OE pin input.
Datasheet says "Hysteresis" and rise time max is 200ns/V, Can you please clarify and provide more details about the specs
regards,
Hello Johnson,
The datasheet states:
Input Hysteresis Allows Slow Input Transition and Better Switching Noise Immunity at Input
You also noted the input transition time spec of 200 ns/V.
I'm guessing your confusion comes from the definition of "Slow Input Transition". In this case, a 'slow input transition' is defined as a signal transitioning at 200 ns/V. Any slower and there is the possibility of oscillations and damaging supply current to the device. A 'fast input transition' would be considered less than 5 ns/V
Your input transition time of 33 us is approximately 100 times slower than the device is specified to operate.
There is a video located here that explains how to achieve a power-on signal safely with a standard CMOS input: 
