20 ns dual-port SRAM for shared-memory designs
The Infineon CY7C027-20AXIT is a 512Kbit dual-port asynchronous SRAM organized as 32K x 16, with a 20 ns access time that lets two independent bus masters read or write the same memory array without dead cycles.
20 ns access time — timing margin in a shared bus
The 20 ns access time and 20 ns write cycle time set the bus timing window. In a dual-port configuration, both ports operate asynchronously, so the access time directly affects how quickly a master can complete a read or write cycle. For a system running at 25 MHz or slower, 20 ns leaves comfortable margin; at higher bus speeds, the address-to-data valid window tightens and may require wait-state insertion. The parallel interface uses separate address and data buses, so PCB layout must manage trace lengths to keep skew within the 20 ns window.
512Kbit in a 100-pin TQFP — density and footprint
The 32K x 16 organization provides 512Kbit of volatile storage in a 100-TQFP package with a 14x14 mm body. The 100-pin count accommodates the dual-port address and data buses plus control signals. Surface-mount assembly is standard; the TQFP footprint is fine-pitch (0.5 mm typical), so solder-paste stencil aperture and reflow profile should follow the manufacturer's guidelines for MSL-rated devices. The industrial temperature grade covers most factory-floor and outdoor telecom enclosures.