4.6 ns propagation delay — the speed ceiling for address/data latching
The SN74ABT373PWR is a single 8-bit D-type transparent latch from the 74ABT family, with tri-state outputs and a propagation delay of 4.6 ns. That 4.6 ns sets the timing margin for the latch-enable-to-output-valid window — at a 50 MHz bus cycle (20 ns period), the latch consumes under a quarter of the cycle, leaving headroom for the upstream address decode and downstream setup time. Output drive is rated 32 mA source, 64 mA sink — the asymmetric ratio is typical of BiCMOS outputs, where the sink side handles the heavier capacitive load of a shared bus backplane. The 64 mA sink allows direct driving of 50 pF traces without an external buffer, provided the total bus capacitance stays under the 50 pF derating curve.
Supply and temperature — 5 V ±10 % rail, -40 to 85 °C ambient
Packaged in a 20-TSSOP (4.40 mm width), the 0.65 mm pin pitch requires a standard 4-layer PCB for fan-out of the inner pins. The tape-and-reel format is the production-volume variant — the cut-tape option suits prototype runs of 10–50 pieces without reel fees.