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SN65C1168E-SEP: Lack of steering diodes to power rails

Aidan Phillips
Prodigy 30 points
Part Number: SN65C1168E-SEP
Other Parts Discussed in Thread: TPS7H2221-SEP

Tool/software:

Hello, 

There are a handful of parts that i have the same question for.  These parts are:

  • SN65C1168E-SEP
  • TPS7H2221-SEP
  • SN54SCT17-SEP
  • SNJ55LVDS32FK

All of these parts don't have steering diodes to their respective Vcc rails for their inputs.  Additionally, the absolute maximum voltage rating on these input pins is independent of the Vcc voltage.  This seems to indicate that if the supply voltage is unpowered while the input pins have nominal voltage levels, the chip has no risk of being damaged.  Can you confirm this?  We have a power sequencing scenario where this occurs.

Aidan

  • +1
    TI__Guru 52082 points

    Hi Aidan,

    Sorry for the delay. 

    You are correct - if the Abs. max voltages don't have a dependence on VCC there is no direct diode connection from pin to VCC and applying a signal within the abs. max rating without VCC will not cause damage. 

    This is true for any of TI's datasheets without VCC dependences on the abs max table - if there is a dependence to VCC than there is a diode. 

    Best,

    Parker Dodson