74LS290 – decade counter with reset and set-to-9, LS-TTL, DIP-14 (generic)

The 74LS290 is a low-power Schottky TTL IC containing an asynchronous decade counter built from a divide-by-2 and a divide-by-5 section, each with its own clock input. The sections are combined into a BCD (0–9) counter or a bi-quinary counter. Two gated reset inputs clear the counter, and two gated inputs set it to 9. It is functionally equivalent to the 74LS90 but has a different pinout (supply on corner pins 14 and 7). The binary version is the 74LS293. It runs from a 5 V supply. It comes in a 14-pin plastic DIP.

Condition: mixed surplus lot, untested. The bag may contain used (pulled) ICs of the same type from different manufacturers, so marking and date code vary. The photo shows one chip from this lot (74LS290 '4D7); only the background was cleaned to white, preserving the marking and leads.

Minimum order: 1 pc.