Active 8-bit D-type with wide supply range
The SN74HCS574RKSR: It operates across a 2V to 6V supply range, covering both 3.3V and 5V logic rails in mixed-voltage designs. Positive edge triggering and tri-state outputs make it suitable for synchronous bus-oriented storage and register applications.
Timing and drive for bus integration
Clock frequency reaches 135 MHz, setting the data throughput ceiling for the register bank. Maximum propagation delay is 11 ns at 6V supply with a 50 pF load — the timing budget for the critical path must account for this delay plus output rise time into the bus capacitance. Each output drives 7.8 mA source and sink at the rated supply voltage, sufficient for typical TTL/CMOS fan-out of 10-15 loads on a short PCB trace. Input capacitance is 5 pF, presenting a light load to the upstream driving stage and preserving signal integrity on high-speed clock and data lines.
Industrial temperature and low standby power
Rated for -40°C to 125°C ambient operating temperature, this flip-flop suits industrial enclosures, outdoor telecom cabinets, and under-hood automotive modules where the junction temperature sees the full range. Quiescent current is 2 µA typical, keeping the standby draw negligible in battery-backed or always-on systems where the register holds state during sleep.
20-VQFN package and reflow handling
Housed in a 20-VFQFN exposed pad package (supplier device package 20-VQFN 2.5x4.5 mm), the part requires a thermal pad on the PCB for heat sinking — the exposed paddle must be soldered to a copper plane to keep junction temperature within limits under continuous switching. Available in Tape & Reel or Cut Tape formats, the reel suits automated pick-and-place for volume production; Cut Tape works for prototype or low-volume builds.
Sourcing and lifecycle for BOM planning
Texas Instruments lists the SN74HCS574RKSR as Active — no last-time-buy window or EOL notice is published, so the part is safe to specify for new designs and long-run production.