The GAL16V8D-20QJI is an electrically erasable PLD from Lattice Semiconductor's GAL®16V8 series, packaged in a 20-lead PLCC (J-Lead) with a 9x9 mm body.
What the 20 ns propagation delay means for timing closure
The 20 ns tpd(1) max sets the combinatorial delay from input to registered output through the logic array. For a 5V bus running at 25 MHz (40 ns period), this leaves 20 ns of timing margin after accounting for setup time and clock-to-output delay of the downstream device — adequate for address decoding or state-machine glue logic in legacy 5V systems, but marginal for 50 MHz buses where the delay consumes the entire half-cycle.
Lattice Semiconductor has designated the GAL16V8D-20QJI as obsolete. No official successor or pin-compatible replacement is recorded from the original manufacturer. Buyers should verify date code and traceability requirements for their application.
The 20-PLCC package (JEDEC MO-047) has a 9x9 mm body with J-leads on 1.27 mm pitch. The surface-mount footprint requires a solder-paste stencil aperture of approximately 0.60 x 1.80 mm per lead for reliable reflow. No exposed thermal pad — junction-to-ambient thermal resistance is dominated by the PCB copper area under the package. The PLCC socket option (e.g., 3M 20-pin PLCC socket) allows field replacement without desoldering.
Supply voltage and temperature grade
The 4.5V to 5.5V internal supply range is compatible with 5V TTL logic families.