datasheets 74ls90 free download

File name 74ls90.pdf

SN54/74LS90 SN54/74LS92 DECADE COUNTER; SN54/74LS93 DIVIDE-BY-TWELVE COUNTER; 4-BIT BINARY COUNTER DECADE COUNTER; The SN54 / 74LS90, SN54 / 74LS92 and SN54 / 74LS93 are high-speed 4-bit ripple type counters partitioned into two sections. Each counter has a di- DIVIDE-BY-TWELVE COUNTER; vide-by-two section and either a divide-by-five (LS90), divide-by-six (LS92) or 4-BIT BINARY COUNTER divide-by-eight (LS93) section which are triggered by a HIGH-to-LOW transi- LOW POWER SCHOTTKY tion on the clock inputs. Each section can be used separately or tied together (Q to CP) to form BCD, bi-quinary, modulo-12, or modulo-16 counters. All of the counters have a 2-input gated Master Reset (Clear), and the LS90 also has a 2-input gated Master Set (Preset 9).