70 ns access time and the read-cycle ceiling
The CY62128BNLL-70SI: The 70 ns access time sets the fastest read cycle the processor can request — at a 10 MHz bus clock (100 ns period), a single read fits within one cycle with 30 ns of margin for address decode and output settle; at 14 MHz (71 ns period), the margin disappears and the bus must insert a wait state. Write cycle time is also 70 ns, so the same timing budget applies to write operations — the word and page write modes share this ceiling, meaning a page-mode burst does not accelerate the write cycle itself, only the address sequencing between writes.
128K x 8 organization and the 5 V supply rail
Organised as 128K words of 8 bits, the CY62128BNLL-70SI presents a byte-wide data bus — it maps directly to an 8-bit microcontroller or a discrete address/data bus without byte-lane steering logic.
Industrial temperature grade and the 32-SOIC footprint
Housed in a 32-SOIC wide-body package (0.445-inch body width, 11.30 mm), the footprint is the standard JEDEC 300-mil SOIC-32 — the same pad pattern used by legacy 32-pin SRAMs and EEPROMs, so a board already routed for a 32-SOIC memory accepts this part without a layout change.
Active lifecycle and the RoHS flag
The part is marked RoHS non-compliant, meaning the lead-frame finish or mould compound contains lead above the RoHS exemption thresholds — if your assembly line or end-customer requires full RoHS compliance (e.g. for EU market or green-label products), this part does not meet that requirement and a Pb-free variant should be sourced.