74LS90 Decade Counter IC

The 74LS90 IC is a Decade Counter, that is it can count from 0 to 9 based on the input clock pulse. It has a 4-bit output, meaning it has four output pins which change from 0000 to 1001 to count from 0 to 9 in Decimal. When a pulse is given after 1001 it automatically resets and starts from 0000 again. More than two 74LS90 can be combined (cascaded) to count higher numbers, for example, two IC cascaded together can count from 0 to 99. Apart from just counting numbers, the IC can also be used to divide by 2 or divide by 5 or divide by 10 by configuring the internal flip-flop accordingly using external components.
Features of 74LS90 Decade Counter IC
It is used as a simple counter from 0 – 9
Low Power Consumption (Typically 45 mW)
The IC has internal protection from clamp voltages
The Power input range for IC is 4.75 to 5.25
The input voltages range for IC at HIGH state is 2.0 minimum and the LOW state is 0.7 maximum
IC draws output current at HIGH state is -0.4mA and for the LOW state: 8.0mA
The internal clamp diode protection range: -1.5V.
The operating temperature range for IC : 0 °C to 70 °C