Part Number: 74LS90
Function: DECADE, DIVIDE-BY-TWELVE AND BINARY COUNTERS
Package: DIP 14 Pin Type
Manufacturer: Texas Instruments
Each of these monolithic counters contrains four master-slave flip-flops and additional gating to provice a divide-by-two counter and a three-stage binary counter for which the count cycle length is divide-by-five for 74LS90.
To use their maximum count length ( decade, divide-by-twelve, or four-bit binary) of these counters, the CKB input is connected to the Qa output.
1. 7490A, SN74LS90N : Decade Counters
2. 7492A, 74LS92 : Divide By-Twelve Counters,
3. 7493A, 74LS93 : 4-bit Binary Counters, SN74LS90N.
Other data sheets are available within the file:
5490A, 5492A, 5493A, 54LS90, 54LS92