8-bit D-type flip-flop for high-speed bus and register applications
The Texas Instruments SN74AC574PW is an 8-bit D-type flip-flop from the 74AC series. It captures data on the positive edge of the clock and presents it through tri-state, non-inverted outputs. The part operates from a 2V to 6V supply and is rated over -40°C to 85°C. With a maximum clock frequency of 153 MHz and a propagation delay of 9.5 ns at 5V and 50 pF load, this flip-flop suits high-speed data paths where timing margin matters. The 24 mA output drive (both high and low) provides enough fan-out for multiple CMOS or TTL loads without external buffers.
153 MHz clock and 9.5 ns delay — what they mean for the bus
The 153 MHz clock rating is the maximum toggle frequency. The 9.5 ns propagation delay at 5V is the time from clock edge to output valid. The 4 µA quiescent current keeps static power negligible, important for power-budgeted boards. The 4.5 pF input capacitance per pin is low enough that clock-line loading from eight flip-flop inputs is manageable without a dedicated clock buffer.
Active production — no obsolescence risk for new designs
The SN74AC574PW is listed as Active with a ROHS3 compliance status. That means TI continues to manufacture it, and there is no last-time-buy or end-of-life notice on this part. For a BOM line, this is a safe choice for both prototype and production builds — no supply discontinuity expected.
20-TSSOP package — board footprint and assembly
Housed in a 20-TSSOP (4.40 mm wide, 0.173" pitch) surface-mount package, this part fits standard SMT assembly lines. The supplier device package is 20-TSSOP.