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TPIC6C595: possible to replace TPIC6C596 by TPIC6C595?
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.
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.
