Dual-port synchronous SRAM for bus bridging
The CY7C09199V-6AXC from Cypress is a 1.152 Mbit dual-port synchronous SRAM organized as 128K x 9 bits. The synchronous interface clocks at 100 MHz and delivers a 6.5 ns access time, so the bus turnaround is tight enough to keep up with a fast RISC core without inserting wait states. The 9-bit width — eight data bits plus one parity bit — is a common choice in telecom and networking gear where single-bit error detection is done in software or an external parity checker.
The CY7C09199V-6AXC is officially marked as Obsolete by Cypress (now Infineon). Any stock you find is either new-old-stock from the original production run or surplus pulled from distributor shelves. We source it through our independent supply network — verified, traceable inventory from vetted surplus and broker sources. If you are filling a repair or a short-run production BOM, this is the channel that keeps the line moving. There is no official pin-compatible replacement from Cypress or Infineon that directly supersedes this exact order code. If you are designing a new board, you will need to evaluate a current-production dual-port SRAM from a vendor like Renesas (IDT) or a FIFO part with similar density and speed. For an existing board in the field, the only practical option is sourcing the original part through the independent channel.
6.5 ns access time — timing budget reality
In a 100 MHz synchronous system (10 ns clock period), that leaves about 3.5 ns of setup margin before the next clock edge, assuming zero board delay. That is workable with a well-laid-out PCB, but any long trace runs or multiple loads on the bus will eat into that margin fast. Keep the SRAM close to the master and use series termination on the address/control lines.
Package and footprint — 100-TQFP
The 100-TQFP (14x14 mm) is a fine-pitch (0.5 mm) surface-mount package. There is no exposed thermal pad, so all heat dissipation goes through the leads — keep the ambient airflow reasonable if the part is running near its maximum supply voltage and clock frequency.