16-bit bus transceiver for 5V backplanes
The 74FCT16543CTPVG8 is a 16-bit non-inverting transceiver from Renesas' 74FCT logic family, organized as two 8-bit elements with independent direction and output-enable controls per byte. The 3-state outputs let multiple transceivers share a common data bus — each byte's output goes high-impedance when its output-enable pin is inactive, so the bus floats cleanly for the next driver.
Output drive and supply headroom
Sourcing 32 mA per output and sinking 64 mA per output, this transceiver drives moderate fan-out on a 5 V backplane without external buffers — the asymmetric sink/source ratio matches the typical load of TTL-compatible inputs. The 56-SSOP package with 0.295-inch body width fits a standard fine-pitch SOIC footprint — the 0.65 mm lead pitch requires a 4-layer board for fan-out only if the trace density is high; a 2-layer board with careful routing often works for this pin count.