70 ns asynchronous SRAM for low-voltage, industrial-temperature designs
The Infineon (Cypress) CY62137BV18LL-70BAI is a 2Mbit asynchronous SRAM from the MoBL2™ family, organized as 128K x 16 bits. The parallel interface and 70 ns write cycle time make it a fit for legacy 16-bit microcontroller buses or low-power FPGA configuration stores that need a simple, no-clock SRAM at 1.8 V.
The 1.75 V to 1.95 V supply range is the first fit gate. If your board already has a 1.8 V rail (common in low-power MCU and FPGA designs), this SRAM connects directly. For 3.3 V or 2.5 V systems, you will need a level translator on the address and data lines, which adds cost and board area. The narrow tolerance also means the rail must be regulated — a 1.8 V LDO with ±2% accuracy keeps the SRAM inside its operating window.
70 ns access time — timing margin on a slow bus
For a microcontroller running at 10–20 MHz with a 50–100 ns bus cycle, this part provides adequate setup margin without wait states. It is not suited for high-speed DSP or cache applications where 10–15 ns synchronous SRAMs are the norm. The 70 ns write cycle time (word or page mode) matches the read timing, so back-to-back read-write sequences are straightforward.
48-FBGA footprint and assembly notes
The part comes in a 48-ball TFBGA (7x7 mm) package — a fine-pitch BGA that requires solder-paste stencil design, reflow profiling, and X-ray inspection after assembly. It is not hand-solderable in a rework loop. The 0.5 mm ball pitch demands careful PCB routing; fan-out vias are typically needed on inner rows.
Industrial temperature grade and deployment
The 1.8 V core keeps dynamic power low, which helps in convection-cooled enclosures.
Lifecycle and sourcing posture
It is RoHS non-compliant per the listing, so verify your assembly's exemption requirements if you are in a RoHS-regulated region.