Output drive — the asymmetry matters
The output is rated for 1 mA source (high) and 24 mA sink (low). That 24:1 ratio means the low side can drive a standard TTL fan-out of ten loads, but the high side is weak — you cannot directly drive an LED or a relay coil from the high output without a pull-up or a buffer. If the downstream input is CMOS with a high-impedance gate, the 1 mA source is fine; if it is a bipolar TTL input, plan on a pull-up resistor to hold the logic high level within VOH specs.
Through-hole DIP — field-service friendly
The 16-DIP package (0.300" body width) is socket-friendly. On a repair call, you can swap this part with a standard IC extractor — no desoldering station, no hot air. If the board uses a machined-pin socket, the 7.62 mm row spacing matches standard 0.3" DIP sockets. No need to worry about bent leads if you use a zero-insertion-force socket for programming or testing.