What the 10 ns tpd means on the bench
The GAL16V8D-10LJI: That 10 ns tpd sets the speed ceiling for registered logic paths — a combinatorial signal through this part adds 10 ns to the timing budget, so a 50 MHz clock leaves just 10 ns for setup and hold after the delay.
The J-lead footprint is standard for PLCC-20; the same land pattern serves other GAL16V8 speed grades, so a board laid out for this part can accept a faster -7 or -15 variant without a layout change.
Obsolete — sourcing reality
Lattice Semiconductor has marked the GAL16V8D-10LJI as obsolete. For a repair bench that sees this PLD on a dead board, the scorch mark tells you which part actually died; the replacement comes from surplus inventory, and availability is confirmed at RFQ time.