Octal transparent latch for 2V–6V buses
Propagation delay sits at 30 ns, typical for the HC logic family at 5V.
30 ns propagation delay — bus timing margin
At 30 ns propagation delay, this latch adds about one HC gate delay to the address/data path. In a system clocked at 20 MHz (50 ns period), that leaves 20 ns for setup and hold — workable for most microprocessor buses but tight if the latch sits in a feedback or read-modify-write loop. The 7.8 mA output drive is enough for a lightly loaded bus (2–3 TTL loads or a handful of CMOS inputs), but if you are fanning out to more than five loads, budget for a buffer stage or use a 74HCT variant with higher drive.
Tri-state outputs and the 8:8 circuit
The tri-state output enable (OE) lets you share the bus with other drivers — common in memory address latching, I/O port expansion, or bidirectional data paths. The 8:8 circuit means eight inputs map to eight outputs with a single latch-enable (LE) and output-enable (OE) controlling all channels. One independent circuit per package, so you get one 8-bit latch in the 20-SOIC.