SDLS097 - MARCH 1974 - REVISED MARCH 1988
PRODUCTION DATA documents contain information current as of publicationdate. Products conform to specifications per the terms of Texas Instrumentsstandard warranty. Production processing does not necessarily include testingof all parameters.
'290, 'LS290...DECADE COUNTERS
'293, 'LS293...4–BITBINARY COUNTERS
The SN54290/SN74290, SN54LS290/SN74LS290, SN54293/SN74293, and SN54LS293/SN74LS293counters are electrically and functionally identical to the SN5490A/SN7490A,SN54LS90/SN74LS90, SN5493A/SN7493A, and SN54LS93/SN74LS93, respectively. Onlythe arrangement of the terminals has been changed for the '290, 'LS290, '293,and 'LS293.
Each of these monolithic counters contains four master-slave flip-flopsand additional gating to provide a divide-by-two counter and a three-stagebinary counter for which the count cycle length is divide-by-five for the'290 and 'LS290 and divide-by-eight for the '293 and 'LS293.
All of these counters have a gated zero reset and the '290 and 'LS290 alsohave gated set-to-nine inputs for use in BCD nine's complement applications.
To use the maximum count length (decade or four-bit binary) of these counters,the B input is connected to the QA output. The input count pulsesare applied to input A and the outputs are as described in the appropriatefunction table. A symmetrical divide-by-ten count can be obtained from the'290 and 'LS290 counters by connecting the QD output to the A inputand applying the input count to the B input which gives a divide-by-ten squarewave at output QA.
View more information about generic part numbers:SN74290, SN74293, SN74LS290, SN74LS293
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