flash MEMORY CMOS 4M (512k X 8/256K X 16) BIT 256K X 16 flash 3V PROM, 90 ns, PBGA48 flash MEMORY CMOS 4M (512k X 8/256K X 16) BIT 256K X 16 flash 3V PROM, 55 ns, PBGA48 flash MEMORY CMOS 4M (512k X 8/256K X 16) BIT 256K X 16 flash 3V PROM, 70 ns, PBGA48 flash MEMORY CMOS 4M (512k X 8/256K X 16) BIT 256K X 16 flash 3V PROM, 55 ns, PDSO48