2Mbit asynchronous SRAM for low-voltage, industrial-temperature designs
The Cypress CY62137CV25LL-55BVI is a 2Mbit asynchronous SRAM from the MoBL® series, organized as 128K x 16 bits. It operates from a 2.2 V to 2.7 V supply and delivers a 55 ns access time, making it a fit for battery-powered or low-voltage embedded systems that need a fast, volatile data buffer without the complexity of synchronous clocking. The parallel interface is straightforward to connect to any MCU or FPGA with a static memory controller. Rated for -40°C to 85°C, it is suited for industrial control, outdoor telecom, and automotive cabin-domain applications where temperature extremes are routine.
55 ns access time — timing margin at 2.5 V
The 55 ns access time is the cycle-limiting spec for this part. At the nominal 2.5 V rail, the address-to-data valid window is tight enough that a slow memory controller or long PCB trace will eat into margin. The write cycle time is also 55 ns, so back-to-back writes run at the same rate. Compared to a 10 ns part like the CY7C1011DV33-10BVXI, this is a slower, lower-power tier — the trade-off is reduced standby current and a wider operating temperature range at the cost of throughput.
Supply rail and package — fit check before ordering
This SRAM requires a 2.2 V to 2.7 V supply — it will not tolerate a 3.3 V rail. The 48-ball VFBGA (6x8 mm) is a fine-pitch BGA; the board must have a matching land pattern and the reflow profile must follow the JEDEC MSL rating on the bag. The industrial temperature range (-40°C to 85°C) covers most environments outside a climate-controlled lab, but the part is not rated for extended automotive under-hood use (125°C).
Lifecycle and sourcing reality
It is RoHS non-compliant (lead-bearing solder balls), which may restrict its use in regions with strict RoHS enforcement unless an exemption applies. For dual-sourcing or a faster alternative, the CY7C1011DV33-10BVXI is a 10 ns, 3.0 V part in the same 128K x 16 organization — but the supply voltage differs, so a board redesign is needed.