Thanks for the heads-up.
Can anything be done to improve the speed of a PNP darlington array? Could there be an application circuit, that would give it it a speed boost?
Just asking as I now have the UDN2981s .. but I guess I should look into the M54564P (that the rainbowduino uses).
I read the following note on the datasheet:
Turn-off delay is influenced by load conditions. Systems applications well below the specified output loading may require timing considerations for some designs, i.e., multiplexed displays or when used in combination with sink drivers in a totem pole configuration.
All unused inputs must be connected to ground. Pulldown resistors ([ch8776] 10 k[ch937]) are recommended for inputs that are allowed to float while power is being applied to VS.
Does this mean I should use a pull down to ground on the UDN2981 output pins? Could this maybe help with timing?