What this 74HC174 hex D flip-flop does on your board
The Texas Instruments SN74HC174PW is a single 6-bit positive-edge triggered D-type flip-flop with an asynchronous master reset in a 16-TSSOP package. Each of the six flip-flops captures the logic level on its D input on the rising edge of the clock and holds it until the next clock edge or until the MR (master reset) line is pulled low, which forces all outputs low regardless of the clock state. The outputs are non-inverted, so Q follows D after each clock pulse. The 74HC family's CMOS construction keeps quiescent current at 8 µA typical.
50 MHz clock and 27 ns propagation delay — timing margin reality
Rated clock frequency is 50 MHz. Maximum propagation delay from clock to Q output is 27 ns at 6 V supply with a 50 pF load. Input capacitance is 3 pF per pin. Output drive is 5.2 mA both source and sink.
Package and temperature grade — where it fits physically
The 16-TSSOP body is 4.40 mm wide. Surface-mount only; no through-hole variant in this order code.
Lifecycle and sourcing — active, no LTB pressure
TI lists the SN74HC174PW as Active with ROHS3 compliance. There is no end-of-life notice, no last-time-buy window, and no successor part number.