74LS90 Datasheet (Motorola)

74LS90, DECADE COUNTER

The LS90, LS92, and LS93 are 4-bit ripple type Decade, Divide-By-Twelve, and Binary Counters respectively.

Each device consists of four master/slave flip-flops which are internally connected to provide a divide-by-two section and a divide-by-five (LS90), divide-by-six (LS92), or divide-by-eight (LS9

DECADE COUNTER; DIVIDE-BY-TWELVE COUNTER; 4-BIT BINARY 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 divide-by-two section and either a divide-by-five (LS90), divide-by-six (LS92) or divide-by-eight (LS93) section which are triggered by a HIGH-to-LOW transition 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

74LS90 Features

* S Input to Q0 and Q3 Outputs MS Input to Q1 and Q2 Outputs MR Input to Any Output Min 32 16 10 12 32 34 10 14 21 23 21 23 20 26 26 16 18 48 50 16 21 32 35 32 35 30 40 40 26 40 26 40 Typ Max Min 32 16