The CY7C199-15PC: This is a volatile, byte-wide static RAM intended for use as fast scratchpad, cache, or working memory in legacy digital systems — think old 8-bit microprocessor boards, embedded controllers, test equipment, or retrocomputing builds that need a 5 V tolerant, no-refresh memory with sub-20 ns cycle times.
15 ns read and write cycle times match the access time spec.
Pin compatibility and replacement options
The 28-pin DIP (0.300") footprint is a JEDEC-standard pinout shared by many 32K x 8 asynchronous SRAMs from multiple vendors. Any 28-pin DIP SRAM with the same organization (32K x 8) and a 5 V supply will be pin-compatible — the catch is access time. If your board was designed for the 15 ns speed grade, a slower part (20 ns, 25 ns) may introduce wait-state failures or marginal timing. Faster parts (10 ns, 12 ns) work electrically but may draw slightly higher standby current. There is no single official successor from Infineon; the replacement path depends on whether the board can accept a surface-mount SOIC-28 or TSOP-II package with an adapter, or whether a NOS (new old stock) DIP part is the only drop-in answer.
28-pin PDIP body is 0.300" wide. Through-hole mounting. Confirm lead finish for RoHS compliance.