I'm looking at the datasheet for some TIL311 hexadecimal displays which I ordered (but have not yet arrived. (Actually they appear to be TIL311 clones, but should be compatible.))
According to the datasheet, the left and right decimal point LEDs have their cathodes exposed via pins 4 and 10. The anodes are not connected to a pin; I assume they are hardwired to Vcc within the IC.
I want to turn the decimal point ON when I have +5v on a certain wire.
Am I correct in thinking that the right way to do this would be to use a discrete transistor to allow current to flow from the cathode to ground when it (the transistor) turns on? If so, what's a good kind of transistor to use?
Or is there a simpler way that I haven't thought of?