Dimming 4 LEDs with 1 PWM pin

[runaway_pancake]

Looks like a UDN2981 with an AND input for each.
Don't feel antagonized, but you're advocating.
What's the V_OH with your example at 10mA, 20mA, 30mA, 40mA?

http://www.ti.com/lit/ds/symlink/sn74as1008a.pdf