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Josef 'Jeff' Sipek

I was curious about how fast the ADM3202 RS-232 line drivers were. So, I fed one with 3.3V pulses and looked at the output. Apparently, it takes 100ns before the output moves and then it takes 250ns to go from +6.3V to -6.3V. However, the standard defines anything lower than -3V as a mark, so at that point the serial device should see it. This means only 166ns for the transition or 266ns delay in total. This is significant, but it seems very constant.

Oscilloscope screenshot (50ns/) Channel 3 (cyan, 1V/) showing a quick rising edge from 0 to about 3.3V in less than 10ns Channel 2 (magenta, 5V/) showing a slowly falling edge from 6.3V down to -6.3V over 250ns
Aug 11, 2023, 08:16 PM·Public·Web
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