Package and board-fit — 44-TSOP II footprint
The 71V424S10PHG: This is the standard thin small-outline package for high-density SRAM — the 0.8 mm pin pitch and 44-lead count match the JEDEC MO-142 footprint, so the board layout follows a known land pattern without custom pad geometry. Surface-mount assembly with the 10 ns access time means the part keeps up with a 100 MHz bus without wait states, provided the PCB trace length from the memory controller to the TSOP is kept under 150 mm to hold the signal-integrity budget.
512K x 8 organization — the byte-wide bus decision
Organised as 512K words of 8 bits each, this SRAM presents a byte-wide parallel interface. For an 8-bit microcontroller or a 32-bit processor that can byte-lane address individual memory banks, the 512K x 8 map simplifies the address decoding — the upper address lines select the chip, and the lower 19 lines (A0–A18) cycle through the 512K locations. The 10 ns write cycle time (word, page) matches the read access, so the bus turnaround is symmetric — no extra idle cycles needed between read and write bursts when the controller's memory timing is set for 10 ns.