The CY7C1049B-15VXC is a 4 Mbit asynchronous SRAM organized as 512K x 8 bits, with a 15 ns access time and a parallel interface. It operates from a 4.5 V to 5.5 V supply and is housed in a 36-SOJ surface-mount package.
15 ns access time — what it means for the bus
The 15 ns access time defines the window from address valid to data valid on a read cycle. Write cycle time is also 15 ns.
Obsolete — sourcing reality
The CY7C1049B-15VXC is obsolete per the manufacturer's lifecycle status. No last-time-buy window remains open through Cypress (now Infineon).
Package and temperature grade
The 36-SOJ (Small Outline J-Lead) package has a 0.400-inch body width and a 10.16 mm width. It is a surface-mount footprint that was common in late-1990s through 2010s telecom and networking line cards. The 0°C to 70°C commercial temperature range limits deployment to indoor, climate-controlled environments — not suitable for outdoor, under-hood, or extended-temperature industrial settings without thermal management.