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Contextual Info: H N 6 2 W 4 5 4 B S e r ie s 262144-word x 16-bit CMOS Mask Programmable ROM HITACHI ADE-203-682 Z Preliminary Rev. 0.0 Nov. 18,1996 Description The HN62W454B is a 262144 words by 16 bits CMOS Mask Programmable ROM. A high speed access of 120/150 ns (max) is the most suitable to the system using a high speed micro-computer by 16 bits.