4-Mbit (256K x 16) Static RAM 256K x 16 STANDARD sram, 45 ns, PDSO44 4-Mbit (256K x 16) Static RAM 256K x 16 STANDARD sram, 55 ns, PDSO44 4-Mbit (256K x 16) Static RAM 256K x 16 STANDARD sram, 55 ns, PBGA48 4-Mbit (256K x 16) Static RAM 4兆位56K × 16)静态RAM 4-Mbit (256K x 16) Static RAM 256K x 16 STANDARD sram, 70 ns, PBGA48