Hello everyone,
I wanna make line runner robot with SN7414N but i can't use it. I connect arduino, chip, CNY70 but input data not convert to HIGH. How can i use it?
PS: Sorry for my languages. My english isn't good 
This chip, with 6 inverters?
and this Optical sensor?
See figure 2 on page 3.
I imagine you have the LED and a current limit resistor so that when 5V is applied the LED shines.
See the table at the bottom of page 1.
The emitter seems to want 50mA, and the voltage drop across the LED will be 1.25V.
So (5V - 1.25V)/.05 = 75 ohm resistor.
On the receive side, the NPN transistor seems to want to conduct 20mA and that will vary as the reflected light changes.
So wire up 5V to a resistor to the collector, and connect the emitter to gnd, then measure the voltage at the collector using an analog input, you should see the voltage change with distance.
Vce looks to be around 1V at 20mA, so a resistor value
(5V - 1V)/.02 = 200 ohms
should be a good starting point.
I might have those currents high, see if there are other suggestions before powering up with these values.
PS: Sorry for my languages. My english isn't good smiley-sad
First it is not a problem, mine so. 
Second : the english part of this forum is not the center of the world, there are other sections in this forum in other langagues with many competances.
Yes, chip and optical sensors is correct. I will buy necessary component as soon as possible and then i try it. I write here the result.
Thanks for answering 