What this dual flip-flop is and where it fits
The Texas Instruments SN74AS74AN is a dual D-type positive-edge-triggered flip-flop with individual preset (set) and clear (reset) inputs, complementary Q and Q̅ outputs, and a 105 MHz maximum clock frequency. It is part of the 74AS (Advanced Schottky) bipolar logic family, which offers a speed-power trade-off between the earlier 74S and the later 74F series. Each of the two flip-flops stores one bit, and the device is supplied in a 14-pin plastic DIP (PDIP-14) for through-hole mounting. Typical applications include register files, shift registers, frequency dividers, and control-latch functions in 5 V digital systems operating in commercial indoor environments (0°C to 70°C ambient).
105 MHz clock and 9 ns propagation delay — timing margin for the bus
The 105 MHz maximum clock frequency and 9 ns propagation delay at 5 V, 50 pF define the timing envelope.
Output drive — asymmetric and intentional
The SN74AS74AN sources 2 mA and sinks 20 mA per output.
Supply and temperature — 5 V nominal, indoor only
Supply range is 4.5 V to 5.5 V; operating temperature is 0°C to 70°C.
Lifecycle and sourcing reality
The SN74AS74AN is listed as Active on the manufacturer's lifecycle status, with RoHS3 compliance (lead-free). For a BOM line that needs a through-hole DIP flip-flop, this part is a safe choice for new designs and ongoing production.