Part PC16550DV/NOPB from Texas Instruments is UART IC that has gone obsolete shown on this PCN Obsolescence/ EOL notice.
Part TL16C550CIFN is listed as the replacement part with a code of Q “Q = Same functionality and PIN-OUT as the compared device but is NOT an exact equivalent.” by Texas Instruments.
To verify this part will work in your application or to view full specifications see the manufacturer datasheet for part TL16C550CIFN.