LTC1442 Dual Comparator, LTSpice simulation

Question

Hi Team, 
 In a project, I am using LTC1442 as a window comparator. I have simulated the model in LTSpice. When Out_A and Out_B combined, output is swinging between 2.32V and 3.3V instead of 0 to 3.3V (V- and V+) . This happens only when Out_A and Out_B are connected together.

Regards 
 Suresh

dmercer · Accepted Answer

Hello: 
 Reading the LTC1442 datasheet it would appear that the two outputs are CMOS and not open drain. So you can't wire OR/AND them together (short). See the pin descriptions on page 9 of the datasheet: 
 OUT A (Pin 1): Comparator A CMOS Output. Swings from V &ndash; to V + . Output can source up to 40mA and sink 5mA 
 OUT B (Pin 8): Comparator B CMOS Output. Swings from V &ndash; to V + . Output can source up to 40mA and sink 5mA.

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LTC1442 Dual Comparator, LTSpice simulation

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