SN75175 CURRENT INFORMATION

Serkan,

Unused inputs should never be left floating.  If you are just testing static power consumption of the chip, it is recommended to force a high or low value on the inputs with either pull-up or pull-down resistors.

From the datasheet, with all outputs disabled the chip can draw up to 70 mA through the supply (pg 4).  I would recommend performing the test again with the inputs forced to ground, just to be sure a floating pin didn't cause problems.

Hi, 

I test it again with the attached circuit diagram.

I measured supply current 45 mA. Is this normal supply current for this device or am I missing something? 

Because from the datasheet, "SUPPLY CURRENT (ALL RECEIVERS) vs SUPPLY VOLTAGE"  graph shows that outputs disabled and outputs enabled currents are very close(pg 8).

I just want to know continuous current of this device when everything is ok. I am expecting 5-10 mA supply current when I am using 4 channel.

Thank you. 

Serkan,

From the graph you mentioned, 50 to 60 mA is the normal Icc for this part operating at 5 V.  Can you tell me more about your application?  Perhaps there is another part that might work better at a lower power consumption.

Thank you for quick return.
I am going to use it for Quadrature Encoder application.
There is 4 motor , and they have own encoders.
I am going to read them with this line receiver.
As you know encoders have A - A' , B- B' , I-I' connection. I am going to connect each of them to SN75175' s channels.
Actually I can connect the encoder lines directly to microcontroller. I'm doing this because of motor noises. This way is more safer.
If it is going to work about 50 mA , it is not worth it. So I need differential receiver which has lower power consumption.

Thank you for your comments.

Thank you.