In the figure we have a TTL logic interfacing circuit as CMOS logic using a 6N139 optocoupler powered with a voltage of 5 V. The operating current is on the order of 0.5 mA and the maximum data transfer frequency is 10 kHz.

In the figure we have a TTL logic interfacing circuit as CMOS logic using a 6N139 optocoupler powered with a voltage of 5 V. The operating current is on the order of 0.5 mA and the maximum data transfer frequency is 10 kHz.