16-bit registered transceiver for 5V backplane and memory-mapped I/O
The IDT74FCT16952BTPV is a FAST 16-bit registered transceiver from Renesas (formerly IDT) designed for bidirectional data flow between two 8-bit buses, with non-inverting outputs and 3-state control. It integrates two 8-bit registered transceiver elements, each with independent direction and output-enable controls, making it suitable for buffered bus interfaces in 5V systems such as industrial controllers, telecom line cards, and memory-mapped peripheral buses.
32 mA source, 64 mA sink — bus drive margin for heavily loaded lines
The output drive capability of 32 mA source and 64 mA sink per channel gives this transceiver the headroom to drive heavily loaded backplane traces or multiple fan-out loads without signal degradation. In a typical 5V system with 50 pF per load and a 10 cm trace, the 64 mA sink current ensures the low-level VOL stays within TTL thresholds even with eight to ten loads. The 3-state outputs let multiple transceivers share a common bus without contention when the output-enable pin is deasserted.
56-TFSOP package — narrow pitch, surface-mount assembly
The 56-TFSOP package (0.173" body width, 4.40 mm) is a fine-pitch surface-mount package that requires careful PCB layout and solder-paste stencil design. This package is not suited for hand-soldering or rework without a hot-air station; a controlled reflow profile per JEDEC MSL classification (verify the specific MSL level from the latest datasheet) is recommended. The narrow pitch means trace routing between the pins and vias needs a 0.15 mm trace/space design rule.