This is a kind of TTL.
Part Number : 7493
Function : Decade and Binary Counter
Package : DIP, SOP 14 Pin Type
Manufacturers : National ( Texas Instruments )
Each of these monolithic counters contains four master slave flip-flops and additional gating to provide a divide-by two counter and a three-stage binary counter for which the count cycle length is divide-by-five for the 90A and divide by-eight for the 93A.
All of these counters have a gated zero reset and the 90A also has gated set-to-nine inputs for use in BCD nine’s complement applications.
Acquired by Texas Instruments on September 23rd, 2011.
Other data sheets within the file : 7490A, 7493A, DM5490, DM5490J