74LS90 Decade Counter IC having 4.75 to 5.25V Supply Voltage with 8mA Low Level and - 0.4mA High Level Output Current. It is a simple counter, it can count from 0 to 9 cyclically in its natural mode. It counts the input pulses and the output is received as a 4-bit binary number through pins QA, QB, QC and QD. The binary output is reset to 0000 at every tenth pulse and count starts from 0 again. 

Used For Power amplifiers, Small-signal amplifiers, Operational amplifier, Microwave amplifier, RF and IF amplifier, Voltage comparator, Multiplier.

Features:-

• A decade counter is a binary counter that is designed to count to 1010b.
  
• By changing the modes of Decade Counter IC, the chip can count up to other maximum numbers and return to zero.
  
• The Decade Counter IC consists of four master-slave JK flip-flops internally connected to provide a MOD-2 (count-to-2) counter and a MOD-5 (count-to-5) counter.
  
• Decade counter is one that counts in decimal digits, rather than binary. A decade counter may have each or other binary encodings.
  

Specifications:-

• Type:                         DIP, JK Flip-Flop
  
• Voltage Rating:           4.75 to 5.25V
  
• Current Rating:           8mA Low Level and - 0.4mA High Level Output Current 
  
• Temperature Rating:    0 to 70 Deg C
  
• Number of Bits:           4 bit
  

Datasheet:-

74LS90 IC Datasheet