What this dual-port SRAM does in the system
The Cypress CY7C09389V-12AC is a synchronous dual-port SRAM organized 64K x 18, giving 1.152 Mbit of storage accessible from two independent ports simultaneously. Each port has its own address, data, and control lines, so two bus masters — typically an FPGA and an ASIC, or two processors — can read or write the same memory location without arbitration logic. The synchronous interface latches addresses on the rising edge of the 50 MHz clock, and the 12 ns access time means data appears on the bus within one clock cycle after the address is presented. This part is designed for high-throughput mailbox, FIFO, or shared-memory buffers in telecom, networking, and video-processing equipment where both ports need full-speed access.
12 ns access time and 50 MHz clock — timing margin matters
The 12 ns access time is the propagation delay from clock edge to valid data on the outputs. At 50 MHz, the synchronous design eliminates dead cycles for back-to-back reads and writes.
Supply and temperature — indoor equipment only
It is not rated for industrial motor drives, outdoor base stations, or automotive under-hood applications.
Package and footprint — 100-pin TQFP
The listed shipping medium is Bag.
For new designs, consider a current-generation dual-port SRAM from Cypress/Infineon or Renesas with similar timing and package.