LMK04832-SP: Does the SPI interface support cold sparing?

Hello Jim,

By un-powered, I presume you mean no supply voltage present vs. a POWERDOWN state.  In this case we technically spec an abs max of Vcc + 0.3 V.  So strictly speaking this is not allowed and violating this would result in large currents due to ESD diode conduction.  But it is possible...

• This increased current draw may not be acceptable for the LVCMOS driver
• The increased current draw would not be acceptable long term for the LMK04832-SP, however if the clock lines were kept low and only went high for programming that would be better.

Both of the above items may be addressable by placing a series resistor at the input of the LMK04832-SP SPI lines and using less than 3.3-V LVCMOS.  This may be acceptable but I couldn't assure this without going through the process to add to the datasheet.

If they program the device to POWERDOWN=1 the current consumption is max 5 mA... this may be less current into the device than through the ESD diodes (when high).  Would this be an option?

73,
Timothy