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TPIC6C595: possible to replace TPIC6C596 by TPIC6C595?

Hans
Genius 12865 points
Part Number: TPIC6C595
Other Parts Discussed in Thread: TPIC6C596

Hello Team,

can several cascaded TPIC6C596s be replaced by TPIC6C595 in an application which drives relays keeping the same timing? 

SRCK is between around 7 MHz. 

Thanks and Best Regards,

Hans

  • 0
    TI__Genius 15776 points

    Hi since they are old deivce i will check the difference and reply you later

  • 0
    Prodigy 10 points

    Hello Frank,

    we intended (actually we need) to replace TPIC6C596 with TPIC6C595 in many existing design for reasons of availability. Each SER_OUT is routed to the SER_IN of the next device in the chain, with chain length up to about 30 devices on one board. There are good PWR/GND planes, and adequate clock drivers an termination. However, the '595 datasheet recommends a SER_IN hold time of 20ns after SRCK, while the T_CO of SER_OUT is only 15ns typically. So the typical application circuit would theoretically fail timing. The '596 avoids this issue by delay SER_OUT by 1/2 clock period. I tried it with the '595, it actually works over temperature even with a few ns of timing margin. So is this hold time requirement only meant for widely scattered systems with poor signal integrity? I appreciate your advise.

  • 0 in reply to Paul Gruber
    TI__Genius 15776 points

    Since the laber day is from 5.1 to 5.5, our expert will reply you on 5.6 

  • 0 in reply to Frank Qiu
    TI__Genius 15776 points

    From the datasheet i think it's ok to replace 596 to 595. Since they are so old device so I can't confirm whether there is no issue in the replacement.