Logic capacity and I/O budget for the design
The XC7A35T-2CSG325C packs 33,280 logic cells arranged in 2600 CLB slices — enough for mid-complexity glue logic, state machines, or a soft-core processor with peripheral fabric. The 150 user I/O in the 324-ball CSPBGA package gives you headroom for a parallel bus, a DDR memory interface, and a handful of control signals without starving the pinout. On-chip block RAM totals 1,843,200 bits (1.8 Mbit) — budget this for FIFOs, small frame buffers, or coefficient tables. If your application needs more than that, the Artix-7 fabric connects to external DDR3 via the memory controller hard block on the same die, though the I/O count and package choice limit the bus width.
Supply rails and temperature grade
Core voltage is 1.0 V nominal with a 0.95–1.05 V window — the FPGA's internal LDOs and PLLs expect this rail clean to within 50 mV ripple. The commercial temperature grade (0 °C to 85 °C junction) suits controlled indoor environments, telecom shelters, and benchtop instrumentation. For extended industrial or outdoor use, the Artix-7 family offers an industrial-grade variant (XC7A35T-2CSG325I) with a -40 °C to 100 °C TJ range, though the BOM cost and availability differ.
Package footprint and board-level integration
The 324-ball CSPBGA (15x15 mm, 0.8 mm pitch) demands a 6- to 8-layer PCB for fan-out — the inner rows of balls route through buried vias. The package is lead-free and compatible with standard reflow profiles (peak 245 °C). No exposed thermal pad; the die heat dissipates through the balls into the board copper. A 2-oz copper plane under the BGA footprint with thermal vias to the bottom layer keeps the junction temperature within the 85 °C ceiling.
Active lifecycle and compliance posture
It is ROHS3 compliant (lead-free, no restricted substances above the threshold). The base product number XC7A35 covers multiple speed grades (-1, -2, -3) and temperature ranges; the -2 speed grade is the mid-range bin, balancing logic performance against static power for most designs.