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DS90LV027A: LVDS Drivers/Receivers Propagation Delays

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Part Number: DS90LV027A

I am transmitting Synchronous Serial Interface (SSI) signals using an LVDS interface.

I read "TI Designs: TIDA-060017 Transmitting SPI Signals Over LVDS Interface Reference Design" as a primer.

1) Document TIDA-060017 used CAT5 cable (page 10) to transfer LVDS signals, what is the best twisted pair cabling available to keep prop delay and capacitive load at a minimum? 

2) Section 6.6 of the DS90LV027A specifies that the max propagation delay is 1.5 ns when CL (capacitive load) = 15 pF. What will the propagation delay be at higher capacitive loads?

3) Section 6.6 of the DS90LV028A specifies that the max propagation delay is 2.5 ns when CL (capacitive load) = 15 pF. What will the propagation delay be at higher capacitive loads?

4) I am highly concerned with the propagation delays of LVDS drivers & receivers. Do you offer any LVDS drivers/receivers which have shorter propagation delays than the two products I identified above?

5) Does TI have any single-channel "Transceiver" packages in the DS90LV family, or outside of this family?

6) Does TI sell any 8-bit Shift Registers with a maximum propagation delay less than 13.5  nS?

  • 1) Propagation delay requirements for cable certification are the same for all twisted pairs

    2) The device was characterized with a 15 pF load. It will probably be higher at higher capacitive loads but we cannot quantify it

    3) The device was characterized with a 15 pF load. It will probably be higher at higher capacitive loads but we cannot quantify it

    4) Not from what I've seen

    5) DS90LV019, SN65LVDM176, SN65LVDS179, SN65LVDS180 are some

    6) You can check the devices here: http://www.ti.com/logic-circuit/flip-flop-latch-register/shift-register/products.html 

    Regards,

    I.K.

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