3.3V 256K X 18 ZBT Synchronous Flow-Through SRAM W/2.5V I/O

The IDT71V2557S IDT71V2559S are 3.3V high-speed 4,718,592-bit (4.5 Mega- bit) synchronous SRAMs organized as 128K x 36 / 256K x 18. They are designed to eliminate dead bus cycles when turning the bus around between reads and writes, or writes and reads. Thus they have been TM given the name ZBT , or Zero Bus Turnaround. By Integrated Device Technology