Datasheet Simtek:

Simtek delivers the integrated ‘Fast SRAM + non-volatile’ memory products. Their memory ICs act like fast SRAM’s, with access speeds to keep up with today’s top microcontrollers and microprocessors. Simtek products are used in avionics, automated meter reading (AMR), telecom and datacom systems, multi-functional printer (MFP).19 Data sheets

5962-92324 -> STK22C48