Asynchronous SRAM for timing-constrained embedded memory
The Cypress CY62126DV30LL-55BVXI is a 1Mbit asynchronous SRAM organized as 64K x 16 bits, with a parallel interface and a 55 ns access time. It operates from a 2.2V to 3.6V supply and is specified over the industrial temperature range of -40°C to 85°C. Housed in a 48-VFBGA (6x8 mm) package, this part is suited for applications requiring fast, random-access read/write memory without refresh overhead — typical in industrial controllers, telecom line cards, and test equipment where deterministic bus timing matters.
55 ns access time — what it means for bus timing
The 55 ns access time sets the window from address valid to data valid on a read cycle. For a memory controller running at 18 MHz or slower, this provides adequate setup margin without wait states. Faster controllers (e.g., 20 MHz and above) will need to account for the access time in the bus timing budget, possibly inserting a wait state. The write cycle time is also 55 ns, so read and write cycles match.
Industrial temperature range and supply flexibility
Rated from -40°C to 85°C, this SRAM is qualified for environments where temperature swings are routine — outdoor telecom cabinets, factory floor automation, and engine-bay-adjacent electronics. The 2.2V to 3.6V supply range allows operation from a nominal 3.3V rail with headroom for brownout conditions, or from a 2.5V rail in low-power designs. The wide supply also simplifies battery-backed SRAM configurations where the backup cell voltage may be lower than the main rail.
48-VFBGA package — footprint and assembly notes
The 48-VFBGA (6x8 mm) package is a fine-pitch BGA with 0.75 mm ball pitch typical. It requires a controlled reflow profile per JEDEC MSL level (verify with Cypress application note), X-ray inspection for solder joint integrity, and is not hand-solderable. The package is surface-mount only. The 'Bulk' shipping medium means the parts arrive in antistatic trays, not tape-and-reel — plan for pick-and-place feeder changeover if your line is set up for reel-fed parts.
Lifecycle and compliance
It is ROHS3 compliant, meeting current EU RoHS exemption rules. No official second-source or pin-compatible alternate is listed in the Cypress portfolio at this density and speed grade, so dual-sourcing will require qualification of a functionally equivalent part from another vendor.