Am27C256-200JC

The Am27C256 is a 256K-bit ultraviolet erasable pro- grammable read-only memory. It is organized as 32K words by 8 bits per word, operates from a single +5 V supply, has a static standby mode, and features fast sin- gle address location programming. Products are avail- able in windowed ceramic DIP packages as well as plas- tic one time programmable (OTP) PDIP, TSOP, and PLCC packages. Typically, any byte can be accessed in less than 55 ns, allowing operation with high-performance microproces- sors without any WAIT states. The Am27C256 offersseparate Output Enable (OE) and Chip Enable (CE)controls, thus eliminating bus contention in a multiple bus microprocessor system. AMD's CMOS process technology provides high speed low power, and high noise immunity.

Typical power con sumption is only 80 mW in active mode, and 100 µW in standby mode. All signals are TTL levels, including programming sig- nals. Bit locations may be programmed singly, in blocks, or at random. The Am27C256 supports AMD's Flashrite programming algorithm (100 µs pulses) resulting in typi- cal programming time of 4 seconds.