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DS90UB914A-Q1: May we know why HS/VS/PCLKO/Lock..... so on need put 10K resistor to GND?

Chen Bogey8
Mastermind 9990 points
Part Number: DS90UB914A-Q1
Other Parts Discussed in Thread: DS90UB913A-CXEVM

Hi Sir 

May we know why HS/VS/PCLKO/Lock..... so on need put 10K resistor to GND? can we let these pins pull high?or removed them also be acceptable?

                                                                      Bogey

                                                                                  

  • 0
    TI__Mastermind 30515 points

    Bogey,

    sorry I can't understand your issue well. please see UB914A d/s for I/O description.

    regarding on the pull-up resistor, it is recommended for un-used input pins, which is one general design rule for cmos IC. thanks.

    best regards,

    Steven 

  • 0 in reply to Steven(Shenzhen) Shi
    Mastermind 9990 points
    Hi Steven
    thanks for your reply~
    my question is, from 914A EVM circuit(P25), VSYNC/PCLKO/LOCK..so on. these pin shows connect 10kohm resistor to GND.
    Customer question me why these pins must need pull down resistors? because their processor need read pin is high in boost satus.
    so they need connect pull high resistor in these pins. that why we need check 914A ), VSYNC/PCLKO/LOCK...these pins pull down resistor.
    Another question is EVM use D4S20L-40MA5-Y connector.
    But we find 913is connect P1 pin1,3
    and 914 is connect pin2,4. is it also can work?
    Bogey
  • 0 in reply to Chen Bogey8
    TI__Mastermind 30515 points
    Bogey,
    1. in our EVM, as no ser is connected, so all these inputs pins are pulleddown to GND with external resistor. for real case, you can remove them.
    2. regarding the connector, are you referring to STP connector?

    best regards,
    Steven
  • 0 in reply to Steven(Shenzhen) Shi
    Mastermind 9990 points

    Hi Steven

    the customer will use diferential cable(STP), but he reference DS90UB913A-CXEVM and question the 913A(p.21) pin12/pin13 connect to P1 pin1/pin3(pair A1). but 914A(P.25) pin41/pin42 connect to P1 pin4/pin2(pair 2). he wonder is it correct or something wrong here.

    May you also help double check circuit as attached?

    14.Video Receiver.pdf