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GENERAL DESCRIPTION

The HY29F400 is a 4 Megabit, 5 volt only CMOS Flash memory organized as 524,288 (512K) bytes or 262,144 (256K) words. The device is offered in industry-standard 44-pin PSOP and 48-pin TSOP packages.

KEY FEATURES

¡ö 5 Volt Read, Program, and Erase

¨C Minimizes system-level power requirements

¡ö High Performance

¨C Access times as fast as 45 ns

¡ö Low Power Consumption

¨C 20 mA typical active read current in byte mode, 28 mA typical in word mode

¨C 30 mA typical program/erase current

¨C 5 ?A maximum CMOS standby current

¡ö Compatible with JEDEC Standards

¨C Package, pinout and command-set compatible with the single-supply Flash device standard

¨C Provides superior inadvertent write protection

¡ö Sector Erase Architecture

¨C Boot sector architecture with top and bottom boot block options available

¨C One 16 Kbyte, two 8 Kbyte, one 32 Kbyte and seven 64 Kbyte sectors in byte mode

¨C One 8 Kword, two 4 Kword, one 16 Kword and seven 32 Kword sectors in word mode

¨C A command can erase any combination of sectors

¨C Supports full chip erase

¡ö Erase Suspend/Resume

¨C Temporarily suspends a sector erase operation to allow data to be read from, or programmed into, any sector not being erased

¡ö Sector Protection

¨C Any combination of sectors may be locked to prevent program or erase operations within those sectors

¡ö Temporary Sector Unprotect

¨C Allows changes in locked sectors (requires high voltage on RESET# pin)

¡ö Internal Erase Algorithm

¨C Automatically erases a sector, any combination of sectors, or the entire chip

¡ö Internal Programming Algorithm

¨C Automatically programs and verifies data at a specified address

¡ö Fast Program and Erase Times

¨C Byte programming time: 7 ?s typical

¨C Sector erase time: 1.0 sec typical

¨C Chip erase time: 11 sec typical

¡ö Data# Polling and Toggle Status Bits

¨C Provide software confirmation of completion of program or erase operations

¡ö Ready/Busy# Output (RY/BY#)

¨C Provides hardware confirmation of completion of program and erase operations

¡ö 100,000 Program/Erase Cycles Minimum

¡ö Space Efficient Packaging

¨C Available in industry-standard 44-pin PSOP and 48-pin TSOP and reverse TSOP packages