Other Parts Discussed in Thread: LM393LV-Q1
Tool/software:
Hi team,
My customers are using LM2903BQDRQ1 in an use case with above input voltage range, I have read this AN Application Design Guidelines for LM339, LM393, TL331 Family Comparators Including the New B-versions (Rev. E) and need to double confirm with you about my understandings:
Customers use case: LM2903BQDRQ1 (not confirmed if pre or post PCN version) Vcc=5V, one of the input voltage range is 3.8V/4.2V as threshold of comparator, another input is changing from 0V to 4.8V. In this case, there is some time that both input will above the Vcc-2V range mentioned in datasheet. So according to the AN, pls help check my understanding and the questions below:
1. If the second input is below Vcc-2V=3V, then LM2903B-Q1 can work normally but with a longer latency?
2. If the second input is from 3V to 4.8V, then LM2903B-Q1, the outputs will follow the table 3-1 in application note (high for pre PCN device and low for post PCN device)? In this case will the comparator outputs not be triggered to change when the second input is passing the threshold set by first input (3.8V/4.2V), am I understanding this correctly?
3. This problem was found by customers because they added input capacitors two both inputs of one channel comparator, before that even with the above inputs the comparator worked normally. Could you also help on explaining that why it can still work normally without input capacitors? What could input capacitors impact in this case?
BR,
Manu
