Bus transceiver for 5V backplanes and memory interfaces
The Cypress CY74FCT245ATSOC is an 8-bit non-inverting bus transceiver from the 74FCT family, designed for bidirectional data flow between two 5V buses. It integrates one 8-bit element with 3-state outputs on both ports, letting you isolate or connect bus segments under a single direction-control signal. The part operates from a 4.75V to 5.25V supply rail and delivers 32mA source, 64mA sink per output — enough drive for heavily loaded backplanes, memory address/data buses, or industrial control links without external buffers.
What the drive current and supply voltage mean for your BOM
The 32mA source / 64mA sink rating is the headline selection parameter. At 64mA sink, this transceiver can drive a full 8-bit bus with multiple loads while maintaining valid logic levels — think memory banks, peripheral buses, or parallel data links in industrial controllers. The 4.75V minimum supply means this is a pure 5V part; it will not operate at 3.3V. If your design runs mixed-voltage logic, you need a level-shifting transceiver like the 74LVTH series (2.7V supply) instead.
Industrial temperature grade — where it goes
The commercial-grade 0°C to 70°C alternative (e.g., SN74LS645-1N) would not survive those conditions. The 20-SOIC wide-body package (7.50mm width) is the footprint — verify your PCB land pattern matches the wider body, not the narrow SOIC-20.