SN75173 >45mA?

Thread Starter

owhite

Joined Jun 11, 2010
4
Folks I'm using a differential line receiver (SN75173) and it's drawing 45mA which seems like it's a lot higher than suggested from the specs.

The circuit is here.

At present the connections to the bus that serve as inputs are not connected to anything. The outputs (pins 3, 5, 11, and 13) are connected to an I/O board plugged into the PCI slot of a computer.

Any suggestions for why the draw is so high? I have a few of these in my circuit and I just surprised by the overall current. I'm using proteus software which supports circuit modeling and it's reporting that the draw should be much lower.

thanks,
owen

 

AnalogKid

Joined Aug 1, 2013
10,986
From the TI datasheet, the max static current is 70 mA with the outputs disabled. I've used similar parts; they are hungry and they do run warm.

ak
 
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