HD74LS390

HD74LS390 Dual Decade Counters REJ03D0485-0400 Rev.4.00 May 10, 2006 This circuit contains eight master-slave flip-flops and additional gating to implement two individual four-bit counters. The HD74LS390 incorporates dual divide-by-two and divide-by-five counters, which can be used to implement cycle lengths equal to any whole and / or cumulative multiples of 2 and / or 5 up to divide-by-100. When connected as a biquinary counter, the separate divide-by-two circuit can be used to provide symmetry (a square wave) at the final output stage. Features Ordering Information Part Name Package Type Package Code (Previous Code) Package Abbreviation HD74LS390P DILP-16 pin PRDP0016AE-B (DP-16FV) P HD74LS390FPEL SOP-16 pin (JEITA) PRSP0016DH-B (FP-16DAV) FP Note: Please consult the sales office for the above package availability. Taping Abbreviation (Quantity) — EL (2,000 pcs/reel) Pin Arrangement 1A 1 1Clear 1QA Output 1B 2 3 4 1QB 5 Outputs 1QC 6 1QD 7 GND 8 CLR 1...