74LS90 IC – (SMD Package) - Decade Counter IC (7490 IC)

The 74LS90 is a 4-bit ripple type counters partitioned into two sections. Each counter has a divide-by-two section and either a divide-by-five (LS90) 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 counters. All of the counters have a 2-input gated Master Reset (Clear), and the LS90 also has a 2-input gated Master Set. The following are the features:- • Low Power Consumption :Typically 45 mW • High Count Rates :Typically 42 MHz • Choice of Counting Modes : BCD, Bi-Quinary, Divide-by-Twelve, Binary • Input Clamp Diodes Limit High Speed Termination Effects Specification:- Symbol Parameter Min Type Max Units VCC Supply Voltage 4.5 5 5.5 V TA Operating Ambient Temperature Range -55 25 125 °C IOH Output Current — High –0.4 m A IOL Output Current — Low 8 m A Related Document:- 74LS90 SMD Data Sheet