Most FPGAs with 43K logic cells and 320 I/Os come in packages that dominate a board — 27×27 mm or larger. The XC6SLX45-2CSG484C shrinks that footprint to 19×19 mm, thanks to its chip‑scale BGA (CSBGA) package with 0.8 mm ball pitch. That is 40% less board area than the standard FBGA version, yet you still get the same logic capacity and 320 user I/Os.

What You Gain and Lose with CSBGA

The smaller package reduces board area, which is critical for portable or densely packed systems. However, the 0.8 mm pitch requires finer PCB traces and likely micro‑vias if you fan out all 320 I/Os. For 4‑layer boards, you may need to route some signals through inner layers or accept fewer usable I/Os. For 6‑layer or higher boards, this package is manageable. The thermal dissipation is slightly lower than the larger FBGA due to reduced copper area, but for typical consumer or industrial environments (0‑85°C), it is adequate.

Who Should Choose This Part

You need this specific variant if your board is space‑constrained but your design still demands 43K logic cells and 320 I/Os. Example applications: a portable ultrasound device with multiple ADC/DAC interfaces, a compact industrial camera with high‑speed parallel output, or a telecom line card where every square millimeter matters. The -2 speed grade provides a solid 667 MHz, which is enough for DDR2/DDR3 memory controllers at 333 MHz clock rates.

If your board has ample space, the cheaper FBGA version is fine. If you need even smaller package and fewer I/Os, look at the FTBGA‑256 version of the same logic density (which has 186 I/Os). This CSBGA variant hits the sweet spot for high I/O density in a small footprint.