The Cypress CY10E422L-7DC is a 1Kbit parallel SRAM organized as 256 words by 4 bits. Its headline rating is the 7 ns access time, which means the memory can present data on the bus within 7 ns of the address being valid. For a legacy 5 V system running a fast microcontroller or DSP, this keeps the memory from inserting wait states on back-to-back reads.
Through-hole package — field-swappable
This SRAM comes in a 24-pin ceramic DIP (24SBDIP) with through-hole mounting. That is a big deal for field service: you can swap it on site with a soldering iron or a socket, no hot-air station needed. The ceramic package also handles repeated soldering cycles better than plastic, which matters if this lives in a repair kit alongside a dozen other DIPs.
4.94 V supply — legacy 5 V logic
The supply voltage is listed at 4.94 V, which puts it squarely in 5 V TTL territory. Do not try to run this at 3.3 V — it will not work. If your board has moved to lower-voltage logic, you need a level translator or a different SRAM. It is not rated for the engine bay or an outdoor cabinet.