70 MHz clock, 2V–6V supply — the bus-buffer choice
The SN74HC374PWT is a Texas Instruments 74HC-series octal D-type flip-flop with tri-state non-inverted outputs, positive-edge triggered, in a 20-TSSOP package. It clocks at 70 MHz, runs from 2V to 6V, and sinks or sources 7.8 mA per output. The wide supply range is the headline differentiator: it bridges 3.3 V and 5 V logic domains without a level translator, which is the main reason a designer picks 74HC over 74LS or 74F families. The -40°C to 85°C industrial temperature grade suits outdoor telecom, motor-drive control, and factory-automation backplanes — not just office equipment.
31 ns propagation delay — timing budget for the bus
Max propagation delay is 31 ns at 6 V supply and 50 pF load. That figure sets the data-to-clock setup window the upstream device must meet. If the driving logic has a 10 ns output hold time, the 31 ns delay leaves comfortable margin; if the upstream part is slower, you may need to stretch the clock period or switch to a faster logic family like 74F (the 74F374SCX-NS, for example, clocks at 140 MHz with 8.5 ns delay). The 3 pF input capacitance keeps the bus load light, so a single gate driver can fan out to several flip-flops without signal degradation.
Active, ROHS3, 20-TSSOP — sourcing posture
TI lists the SN74HC374PWT as Active with ROHS3 compliance. The 20-TSSOP footprint (4.40 mm width) is a common surface-mount package for board-level glue logic; it shares the same land pattern as many other 20-pin TSSOP bus buffers, so a second-source swap is straightforward if supply tightens.