NEC SAMPLES SYNCHRONOUS 256M-BIT MEMORY CHIPS
(February 20th 1995) The 64M-bit parts are not out in the market in
any numbers, but NEC Corp is already sampling 256M-bit synchronous
dynamic random access memory chip. It reckons it is the first company
to bring 256M-bit parts to market, and is promising volume production
in 1998. 

The parts are fabricated in 0.25 micron CMOS and are claimed to be
the fastest dynamics yet at 250MHz - equivalent to a 4nS cycle.
Synchronous memory chips operate more efficiently because their read
and write cycles are synchronised to the CPU clock.
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