CY7C09179

The CY7C09079/89/99 and CY7C09179/89/99 are highspeed synchronous CMOS 32K, 64K, and 128K x 8/9 dualport static RAMs. Two ports are provided, permitting independent, simultaneous access for reads and writes to any location in memory^.[4] Registers on control, address, and data lines of CY7C09179 allow for minimal set-up and hold times. In pipelined output mode, data is registered for decreased cycle time. Clock to data valid t_CD2 = 6.5 ns^[1] (pipelined). Flow-through mode of CY7C09179 can also be used to bypass the pipelined output register to eliminate access latency. In flow-through mode data will be available t_CD1 = 15 ns after the address is clocked into the device. Pipelined output or flow-through mode is selected via the FT/Pipe pin.

Each port of CY7C09179 contains a burst counter on the input address register. The internal write pulse width is independent of the LOWto- HIGH transition of the clock signal. The internal write pulse is self-timed to allow the shortest possible cycle times. A HIGH on CE0 or LOW on CE1 for one clock cycle will power down the internal circuitry to reduce the static power consumption. The use of multiple Chip Enables of CY7C09179 allows easier banking of multiple chips for depth expansion configurations. In the pipelined mode, one cycle is required with CE₀ LOW and CE₁ HIGH to reactivate the outputs.

Counter enable inputs of CY7C09179 are provided to stall the operation of the address input and utilize the internal address generated by the internal counter for fast interleaved memory applications. A port's burst counter of CY7C09179 is loaded with the port's Address Strobe (ADS). When the port's Count Enable (CNTEN) is asserted, the address counter will increment on each LOW-to-HIGH transition of that port's clock signal. CY7C09179 will read/write one word from/into each successive address location until CNTEN is deasserted. The counter can address the entire memory array and will loop back to the start. Counter Reset (CNTRST) is used to reset the burst counter.

All parts of CY7C09179 are available in 100-pin Thin Quad Plastic Flatpack (TQFP) packages.