8 ns async SRAM — obsolete, but still in the BOM
The Infineon CY7C1021CV33-8ZXCT is a 1Mbit asynchronous SRAM organized as 64K x 16 bits, with a parallel interface and a rated access time of 8 ns. This is a volatile memory — data is retained only while power is applied.
Infineon lists the CY7C1021CV33-8ZXCT as obsolete.
8 ns access time — timing closure for the bus
The 8 ns access time is the headline speed spec for this asynchronous SRAM. It defines how quickly data appears on the outputs after the address is valid. In a system with a 100 MHz bus, the 8 ns window leaves about 2 ns of margin after accounting for clock-to-output delay and PCB trace skew — tight but workable with careful signal-integrity design. If your controller's address-to-data setup requirement is looser than 8 ns, this part fits without wait states.
64K x 16 organization — 16-bit data bus
The 64K x 16 organization means the part presents a 16-bit-wide data bus. For a 32-bit microcontroller, two of these SRAMs can be paired to form a 32-bit memory word. The 1Mbit total density suits moderate buffer or scratchpad applications — think Ethernet frame buffers, audio sample storage, or configuration tables in industrial controllers.