It carries 1 MB of Flash program memory and 128 KB of RAM, along with 100 general-purpose I/O lines.
The 120 MHz core speed on this Cortex-M4 determines how many multiply-accumulate operations per second the DSP extension can sustain. At 120 MHz, the part sits in the mid-range of the Kinetis K20 family.
1 MB Flash / 128 KB RAM — memory budget for the BOM
The 128 KB RAM is organized as 128K x 8; if your data buffers (for Ethernet or ADC scan tables) exceed that, you will need to use the external bus interface (EBI/EMI) to add SRAM or SDRAM. That is a board-area trade-off to plan for at layout.
NRND — what it means for sourcing
That means NXP is not actively marketing this variant for new projects, though it remains available for existing production runs through the independent channel. If you are qualifying a new BOM, look at the Kinetis K2x or K6x series for a current-production replacement — pin compatibility varies by package, so check the migration guide.