[roverT]

Originally Posted by MPaulHolmes

Digi-Key - MM74HC00N-ND (Fairchild Semiconductor - MM74HC00N)

I think anything in the family 74HC00 14 pin quad NAND gates would work. Fran suggested to me NOT to use LS or HTC, but I don't know what that means.

Here's the LEM 500:
Digi-Key - 398-1067-ND (LEM USA Inc - HASS 500-S)

I believe the HC family has faster rise and fall times, better suited for higher speed applicatons than the LS or HTC series.