The 74LS190 is a binary down and up counter that uses the clock pin to increase or decrease the output in binary, it also has 4 inputs to provide parallel to the output of the integrated circuit, the parallel or series configuration can be controlled.

Details :

A counter is asequential circuitconstructed fromflip-flopsandlogic gatescapable of storing and countingpulses(often related to a clock signal) received at itsdesignatedinput . It also acts as a frequency divider. The counting is normally performed inbinary code , which will frequently be natural binary or natural BCD (decade counter).

A counter is a circuit whose outputs follow a fixed sequence and restart when it finishes, or a circuit that receives data serially, ordered at different time intervals. Input pulses can be clock pulses or originate from an external source, and can occur at fixed or random time intervals. The number of outputs limits the maximum number that can be counted.

Features:

• 90 mW Typical dissipation
• High speed… Typical counting frequency of 25 MHz
• Synchronous counting
• Asynchronous parallel loading
• Individual preset inputs
• Counting enable and up/down control inputs
• Cascading
• Input clamp diodes
• High speed termination effects limit