HM628512B Series 4 M SRAM (512-kword × 8-bit) AD.
HM628512B - 4 M SRAM (512-kword x 8-bit)
HM628512BI - 4 M SRAM (512-kword x 8-bit)
HM628512BFP - 4 M SRAM (512-kword x 8-bit)