Am27C256-200JC

The Am27C256 is a 256K-bit ultraviolet erasable pro- grammable read-only memory. Am27C256-200JC 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 Am27C256-200JC 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.