This might help:
Cross for M5M5189

64K (16K*4) HM6289 5V HITACHI
HM6789 5V HITACHI
TC55417 5V TOSHIBA
MB81C75 5V FUJITSU
M5M5189 5V MITSUBISHI *******************
CXK5465 5V SONY
LH5167 5V SHARP
Am99C165 5V AMD
CY7C166 5V CYPRESS
IDT6198 5V IDT
IDT7198 5V IDT
IDT71981 5V IDT
IDT71982 5V IDT
KM6466 5V SAMSUNG
L7C166 5V LOGIC
MCM6290 5V MOTOROLA
SR64E4 5V LATTICE
TMS6789 5V TI

Found at : http://www.flippers.com/StaticRam.html