Hi Guys,
Can someone help me interpret the data sheet for the CD40908BE? I need to know how many mA it can source at the outputs (ie: Pin 10).
I'm sorry, I don't know how to post the data sheet, but its easy to find at Mouser.com.
Thanks for any help!
PDDD
There are several things that must be known.
Supply voltage. 5V? 12v? 15volts?
What are you driving with the output.
A CMOS device? TTL device? LED? transistor?
The datasheet from Texas Instruments shows graphs with the output current of every CD4xxxB Cmos IC. The output current depends on the supply voltage and on how many volts there are across the output transistor.
When the output is shorted then the output transistor has the entire supply voltage across it and the output current is the highest. When the output has no load then the output transistor is saturated and has no voltage across it so the output current is zero.
When the load has a voltage drop like an LED then the current can be seen on the graphs: