The Infineon CY7C1021BNV33L-15ZXI is a 1 Mbit asynchronous SRAM organized as 64K words by 16 bits. It uses a parallel interface and delivers a 15 ns access time, making it suitable for cache, buffer, or scratchpad memory in embedded systems that need fast, simple read/write cycles without a clock.
15 ns access time — timing margin in the bus
For a processor running at 33 MHz (30 ns cycle), this leaves about half a cycle for address decode, propagation, and setup — tight but workable with a fast memory controller. If your bus has additional buffering or a slow FPGA bridge, you may need to budget an extra wait state.
64K x 16 organization — word-wide or byte-wide access
The 16-bit data bus lets a 16-bit or 32-bit microcontroller fetch a 16-bit operand in one cycle. For 8-bit buses, you can use the upper or lower byte enables (noted in the datasheet) to access individual bytes. The 1 Mbit density fills a 64K address space at 16-bit width — common for boot code shadowing or display frame buffers in mid-range embedded designs.
Package and footprint — 44-TSOP II
The part comes in a 44-TSOP II (0.400" body width, 10.16 mm wide) surface-mount package. The shipping medium is Tray, not tape-and-reel, so factor that into your pick-and-place setup.
Obsolete — sourcing reality and the replacement path
The CY7C1021BNV33L-15ZXI is marked Obsolete by the manufacturer. If you are qualifying a replacement, look for a pin-compatible 44-TSOP II async SRAM with the same 64K x 16 organization and 15 ns access time from vendors like ISSI (IS61LV6416-15TLI) or Alliance (AS7C34096-15TIN) — but verify the pinout and timing against your design, as the evidence does not list an official cross-reference.