8 Mbit MoBL asynchronous SRAM for industrial buffer and cache
The Infineon CY62157DV30L-70BVXI is an 8 Mbit asynchronous SRAM from the MoBL (More Battery Life) series, organized as 512K words by 16 bits.
70 ns access — bus timing margin for 8/16-bit hosts
For a 16-bit MCU running at 20 MHz (50 ns cycle), this part requires at least one wait state unless the memory controller stretches the read cycle. It pairs cleanly with slower 8-bit hosts or CPLD-based memory controllers that insert one wait.
512K x 16 organization — direct 16-bit bus match
Organized 512K deep by 16 bits wide, this SRAM connects directly to a 16-bit data bus without byte-lane muxing. For 32-bit processors, two devices can be paired for a 32-bit word. The 8 Mbit density suits moderate-size buffers (e.g., 256 KB for display frame stores or communications packet buffers).
At 3.3 V the access time is guaranteed at 70 ns; at 2.5 V the part still meets the same timing, though the datasheet derating curve should be checked for marginal cases.
48-VFBGA footprint — layout considerations
The 48-ball VFBGA (6x8 mm body) uses a 0.75 mm ball pitch typical of fine-pitch BGAs. The PCB requires at least four layers for fanout, with microvias recommended for the inner balls. The bulk shipping form means parts arrive in anti-static tubes or trays, not tape-and-reel, which affects pick-and-place feeder setup.
Lifecycle and compliance
No successor or second-source part is recorded in the official cross-reference — if dual-sourcing is required, the CY7C1049G30-10VXIT (4 Mbit, 10 ns, same VFBGA footprint) is a faster but lower-density alternative, not a pin-for-pin drop-in.