GENERAL DESCRIPTION
The Am27C256 is a 256K-bit ultraviolet erasable programmable 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 single address location programming. Products are available in windowed ceramic DIP packages as well as plastic one time programmable (OTP) PDIP, TSOP, and PLCC packages.

DISTINCTIVE CHARACTERISTICS
■ Fast access time
   — 55 ns
■ Low power consumption
   — 20 µA typical CMOS standby current
■ JEDEC-approved pinout
■ Single +5 V power supply
■ ±10% power supply tolerance available
■ 100% Flashrite programming
   — Typical programming time of 4 seconds
■ Latch-up protected to 100 mA from –1 V to VCC + 1 V
■ High noise immunity
■ Versatile features for simple interfacing
   — Both CMOS and TTL input/output compatibility
   — Two line control functions
■ Standard 28-pin DIP, PDIP, 32-pin TSOP and PLCC packages