dear members,


i have to drive int0' by an lm 339 output which seems open collector. now problem is vout from 339 swings both side of ground. i used a conventional method transistor and diode connected to its base and ground, it works fine. can i eliminate the transistor by connecting vout to pin directly and a diode 1n4148.

VOUT
-----|-----INT0
.....|
....---
..../
.....|
.....|
GND

ignore the dots.

DATASHEET fr 89c51 states min. Vil = -0.5 v and 1n4148 has a drop of 0.72 v max.

what shoud i do.


abhishek