Overview
The LE28F4001 Series ICs are 524288-word × 8-bit flash memory products that support on-board reprogramming and feature 5 V single-voltage power supply operation. CMOS peripheral circuits were adopted for high speed, low power, and ease of use. These products support a sector (256 bytes) erase function for fast data rewriting.

FEATUREs
• Fabricated in a highly reliable 2-layer polysilicon CMOS flash EEPROM process.
• Read and write operation from a 5 V single-voltage power supply
• Sector erase function: 256 bytes per sector
• Fast access time: 150/200 ns
• Low power
   — Operating current (read): 25 mA (maximum)
   — Standby current: 20 µA (maximum)
• Highly reliable read and write operations
   — Sector write cycles: 104 cycles
   — Data retention time: 10 years
• Address and data latches
• Self-timer erase and programming
• Byte programming time: 35 µs (maximum)
• Write complete detection: Toggle bit and data polling
• Hardware and software data protection
• Pin assignment conforms to the JEDEC byte-wide EEPROM standard
• Packages
   SOP 32-pin (525 mil) plastic package :LE28F4001M
   TSOP 40-pin (10 × 14 mm) plastic package:LE28F4001T
   TSOP 40-pin (10 × 14 mm) plastic package:LE28F4001R