Asynchronous reset — clears without waiting for a clock edge
The reset is asynchronous, meaning the counter clears immediately when the reset line is asserted — no need to wait for the next clock edge. That's useful for power-on reset circuits or emergency clears in a divider chain, but it also means the reset input must be free of glitches or properly debounced in noisy environments. The part is a single-element, 4-bit counter; one package gives you one decade stage.
Commercial temperature grade — indoor, controlled environments only
Rated 0°C to 70°C, this is a commercial-temperature part. It belongs in benchtop instruments, office equipment, or appliance control boards.
Active lifecycle — no end-of-life pressure
The SN74LS90N is listed as Active and ROHS3 compliant. TI still manufactures this part, so there is no last-time-buy clock ticking. For a BOM freeze or a production line that needs a through-hole decade counter, this is a stable line item — no imminent PCN or EOL to watch. Sourcing is through independent distribution; availability and pricing are confirmed at quote time against an RFQ.