GENERAL DESCRIPTION

The HY29F400A 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

■ 5 Volt Read, Program, and Erase

– Minimizes system-level power requirements

■ High Performance

– Access times as fast as 50 ns

■ Low Power Consumption

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

– 30 mA typical program/erase current

– 5 μA maximum CMOS standby current

■ Compatible with JEDEC Standards

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

– Provides superior inadvertent write protection

■ Sector Erase Architecture

– Boot sector architecture with top and bottom boot block options available

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

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

– A command can erase any combination of sectors

– Supports full chip erase

■ Erase Suspend/Resume

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

■ Sector Protection

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

■ Temporary Sector Unprotect

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

■ Internal Erase Algorithm

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

■ Internal Programming Algorithm

– Automatically programs and verifies data at a specified address

■ Fast Program and Erase Times

– Byte programming time: 7 μs typical

– Sector erase time: 1.0 sec typical

– Chip erase time: 11 sec typical

■ Data# Polling and Toggle Status Bits

– Provide software confirmation of completion of program or erase operations

■ Ready/Busy# Output (RY/BY#)

– Provides hardware confirmation of completion of program and erase operations

■ 100,000 Program/Erase Cycles Minimum

■ Space Efficient Packaging

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