Supply voltage and output — one part, multiple rails
In a battery-backed system, that saves the 3 mA typical draw when the clock is idle.
Package and rework — the VFLGA footprint
The four pads are on the bottom — no leads, so the part self-centers during reflow.
Lifecycle — no longer in active production
The DSC6101MI1A-008.0000T is listed as Obsolete by Microchip.
