Tri-state outputs and bus sharing
Tri-state outputs let the 74F299PC share a data bus with other devices — the outputs go high-impedance when the output-enable pin is inactive. That means you can wire multiple shift registers or memory chips on the same bus without contention. In a 5V backplane or a microcontroller expansion port, this saves board space and avoids external bus transceivers for up to eight bits.
It is RoHS non-compliant (lead-bearing), which may restrict use in new EU/RoHS-regulated designs unless a specific exemption applies.