Dual 4-bit binary counter in Bulk
The 74LS393PCQR from Texas Instruments is a dual 4-bit binary counter, a logic device that increments its output on each clock pulse, used in frequency division, event counting, and time-delay circuits. It is supplied in a Bulk package, suitable for through-hole assembly and prototyping environments where individual units are needed rather than tape-and-reel.
Active lifecycle and sourcing posture
Note the RoHS compliance status: this part is marked RoHS non-compliant, which may restrict its use in markets with RoHS mandates unless an exemption applies.
What the binary counter does in a circuit
As a dual 4-bit counter, the 74LS393PCQR contains two independent 4-bit ripple counters on one chip, each with a clock input and a master reset — the ripple architecture means the bit outputs change sequentially, so the total propagation delay through all four stages sets the maximum clock rate.