GENERAL DESCRIPTION
The Am28F256A is a 256 K Flash memory organized as 32 Kbytes of 8 bits each. AMD’s Flash memories offer the most cost-effective and reliable read/write non- volatile random access memory. The Am28F256A is packaged in 32-pin PDIP, PLCC, and TSOP versions. It is designed to be reprogrammed and erased in-system or in standard EPROM programmers. The Am28F256A is erased when shipped from the factory.

DISTINCTIVE CHARACTERISTICS
■ High performance
   — Access times as fast as 70 ns
■ CMOS low power consumption
   — 30 mA maximum active current
   — 100 µA maximum standby current
   — No data retention power consumption
■ Compatible with JEDEC-standard byte-wide 32-Pin EPROM pinouts
   — 32-pin PDIP
   — 32-pin PLCC
   — 32-pin TSOP
■ 100,000 write/erase cycles minimum
■ Write and erase voltage 12.0 V ±5%
■ Latch-up protected to 100 mA from –1 V to VCC +1 V
■ Embedded Erase Electrical Bulk Chip-Erase
   — 1.5 seconds typical chip-erase including
      pre-programming
■ Embedded Program
   — 14 µs typical byte-program including time-out
   — 0.5 second typical chip program
■ Command register architecture for
   microprocessor/microcontroller compatible
   write interface
■ On-chip address and data latches
■ Advanced CMOS flash memory technology
   — Low cost single transistor memory cell
■ Embedded algorithms for completely
   self-timed write/erase operations