8-bit register with inverted tri-state bus hold
The SN74ACT564PW is an 8-bit D-type flip-flop from the 74ACT family, clocked at 90 MHz on a positive edge. The inverted outputs feed a tri-state bus — the /OE pin floats the bus when pulled high, so multiple registers can share a data line without contention. Output drive is rated 24 mA source and sink per pin, enough to drive a 50 pF load with a 10.5 ns propagation delay at 5 V. The 4 µA quiescent current keeps the static draw negligible in battery-backed or always-on rails. The 4.5 pF input capacitance is low enough that a single clock source can fan out to several loads without a dedicated buffer.
Industrial temperature grade and package fit
The 20-TSSOP body (4.40 mm width, 0.65 mm pitch) is a common footprint; the PCB land pattern matches the standard TSSOP-20 IPC-7351 nominal.