If any FPGA design requires more rails than a basic 4-channel sequencer can support, one approach is to cascade multiple devices (cascade two power sequencers) but this also adds component count and inter-device dependencies.
So, for more complex power tees, The high-channel density of the ADM6840 allows a single device to support eight power rails on an FPGA.
This approach improves accuracy, consistency, and repeatability across builds and reduces sensitivity to component tolerances and printed circuit board (PCB) leakage.
An 8-channel sequencer: While it supports up to eight power rails in a single device, it is also fully capable of daisy-chaining multiple ICs to accommodate even larger or more complex FPGA power trees such as the configuration shown in Figure 3.
Designers can link devices using the DONE, ON, and OFF pins, maintaining coordinated sequencing across all rails. This flexibility allows system architects to scale beyond eight channels if required, while still benefiting from this simplified design.
Related Topics:
Why Do FPGAs Need Multirail Power Sequencing?
What Is the Difference Between a Power Sequencer and a Voltage Supervisor?
Reliable Power Up and Power Down Sequence
Why an 8-Channel Power Sequencer is Better Than Multiple 4-Channel Devices?
How does the ADM6840 help ensure consistent power-up timing in FPGA?
Applicable Part Numbers
| DigiKey Part Number | Manufacturer Part Number |
|---|---|
| MAX16050ETI+TTR-ND,MAX16050ETI+TCT-ND,MAX16050ETI+TDKR-ND | MAX16050ETI+T |
| MAX16050ETI±ND | MAX16050ETI+ |
| 175-MAX16165ATPH+TTR-ND,175-MAX16165ATPH+TCT-ND,175-MAX16165ATPH+TDKR-ND | MAX16165ATPH+T |
| 505-MAX16165ATPH±ND | MAX16165ATPH+ |
| MAX16025TE±ND | MAX16025TE+ |
| MAX16025TE+TTR-ND,MAX16025TE+TCT-ND,MAX16025TE+TDKR-ND | MAX16025TE+T |
| 175-ADM6840EAWABFH+TTR-ND, 175-ADM6840EAWABFH+TCT-ND, 175-ADM6840EAWABFH+TDKR-ND | ADM6840EAWABFH+T |