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CD74HC4094: Function table

user4109590
Prodigy 180 points
Part Number: CD74HC4094
Hello E2E Logic Forum Members,
Our customer asked us the function which is not described in the datasheet.
Would you please input the function to ??? in the below table?
INPUTS                      PARA OUT  SER OUT
--------------------------- ----------------- ----------------------
CP   OE    STR    D     Q0     Qn      QS1      QS2
---- ------- -------- ------ ------- ------- ----------- ------------
↑       L       X        X      Z        Z       QÕ6      NC
---- ------- -------- ------ ------- ------- ----------- ------------
↓       L       X        X      Z        Z       NC         Q7
---- ------- -------- ------ ------- ------- ----------- ------------
↑       H       L        X     NC     NC     QÕ6      NC
---- ------- -------- ------ ------- ------- ----------- ------------
↑       H      H        L      L       Qn-1   QÕ6      NC
---- ------- -------- ------ ------- ------- ----------- ------------
↑       H      H        H     H       Qn-1   QÕ6      NC
---- ------- -------- ------ ------- ------- ----------- ------------
↓       H      H        H     NC     NC     NC        Q7
---- ------- -------- ------ ------- ------- ----------- ------------
↓       H      L         H     ???    ????  ???       ???
---- ------- -------- ------ ------- ------- ----------- ------------
↓       H      L         L      ???    ???    ???       ???
---- ------- -------- ------ ------- ------- ----------- ------------
H = High Voltage Level,
L = Low Voltage Level,
X = DonÕt Care,
NC = No charge,
Z = High Impedance Off−state,
↑ = Transition from Low to High Level,
↓ = Transition from High to Low.
Thanks,
Yasu
  • 0
    TI__Genius 16735 points
    Hello Yasu,

    The operation is mentioned on the first page of the datasheet. When the Strobe pin is low the data will not transfer from each shift register to the storage register. Meaning the data line will be a don't care X. This also means that the output of the Q0 to Qn pins will have NC. Lastly since these are negative CP, this means that QS1 will have NC and the QS2 will have Q7 as its output. Summary of what I said is below.

    ---- ------- -------- ------ ------- ------- ----------- ------------
    ↓ H L X NC NC NC Q7
    ---- ------- -------- ------ ------- ------- ----------- ------------

    Thanks!
    - Karan
  • 0 in reply to Karan Kotadia
    Prodigy 180 points
    Hello Karan-san,

    Thanks for your quick reply!

    Thanks,
    Yasu