5461 - Why is there a high current in the device even if the device is functionally working if VCCIO is powered before Vcc?

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• 5411 - Why does iCE40 devices heats up and have high current consumption when VCCIO and VCCIO2 are applied before VCC?

  If we look at the iCE40 datasheets, we can see that there is a correct Power Supply Sequence for the device to operate properly. VCCIO0 and VCCIO2 should only be applied after Vcc has reached a level of 0.5V or greater. Though the device may ...

• 1782 - MachXO: What is the IO state when VCC, VCCAUX reach the datasheet recommended levels but VCCIO has not?

  From the datasheet: https://www.latticesemi.com/view_document?document_id=9922 Typical I/O Behavior During Power-up The internal power-on-reset (POR) signal is deactivated when VCC and VCCAUX have reached satisfactory levels. After the POR signal is ...

• 1889 - MachXO2: I want to use the output of one Lattice MachXO2 I/O bank to control power on the board to the remaining VCCIO banks. Is this possible assuming that I will first power up the MachXO2 using only the VCC core and one

  The user can power up the Lattice MachXO2 part using only the VCC core and one VCCIO bank. There are, however, a few constraints: As per the "Typical I/O Behavior During Power-up" section of the MachXO2 Family Data Sheet, the user needs to pick ...

• 2142 - [ispMACH 4000]: What is the reason behind the high supply transients during startup for the ispMACH 4000 device?

  High transients during startup are because of supply sequencing used on the board, resulting in temporary leakage in the I/O buffer of the device. To minimize the transient current during power-on, configure the CPLD I/Os to a pull-up or float state. ...

• 6173 - MachXO3: In the event full device power-down does not proceed or occur, could VCCIO be restored and user-mode resume without performing a device re-configuration?

  Description: This FAQ list down the requirement for VCCIO can be restored without device re-configuration. Solution: In the event the VCC and VCCIO0 have been affected by the power-down, all VCCIO will be in off-mode and thus it requires device ...