Dual 4:1 Multiplexer/Demultiplexer Bus Switch with 25 Ohm Series Resistors in Outputs The part FST32253QSC is manufactured by FAI (Fairchild Semiconductor). 

Key specifications include:
- **Type**: 25-Bit Configurable Registered Buffer
- **Technology**: CMOS
- **Supply Voltage**: 3.3V
- **Operating Temperature Range**: -40°C to +85°C
- **Package**: 100-LQFP (Low-Profile Quad Flat Package)
- **Function**: Provides buffering and signal conditioning for high-speed data transfer applications.

For detailed electrical characteristics, timing diagrams, and pin configurations, refer to the official FAI datasheet.