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SUMMARY DESCRIPTION

The M29W400B is a 4 Mbit (512Kb x8 or 256Kb x16) non-volatile memory that can be read, erased and reprogrammed. These operations can be performed using a single low voltage (2.7 to 3.6V) supply. On power-up the memory defaults to its Read mode where it can be read in the same way as a ROM or EPROM. The M29W400B is fully backward compatible with the M29W400.

■ SINGLE 2.7 to 3.6V SUPPLY VOLTAGE for PROGRAM, ERASE and READ OPERATIONS

■ ACCESS TIME: 55ns

■ PROGRAMMING TIME

– 10?s per Byte/Word typical

■ 11 MEMORY BLOCKS

– 1 Boot Block (Top or Bottom Location)

– 2 Parameter and 8 Main Blocks

■ PROGRAM/ERASE CONTROLLER

– Embedded Byte/Word Program algorithm

– Embedded Multi-Block/Chip Erase algorithm

– Status Register Polling and Toggle Bits

– Ready/Busy Output Pin

■ ERASE SUSPEND and RESUME MODES

– Read and Program another Block during Erase Suspend

■ UNLOCK BYPASS PROGRAM COMMAND

– Faster Production/Batch Programming

■ TEMPORARY BLOCK UNPROTECTION MODE

■ LOW POWER CONSUMPTION

– Standby and Automatic Standby

■ 100,000 PROGRAM/ERASE CYCLES per BLOCK

■ 20 YEARS DATA RETENTION

– Defectivity below 1 ppm/year

■ ELECTRONIC SIGNATURE

– Manufacturer Code: 0020h

– Top Device Code M29W400BT: 00EEh

– Bottom Device Code M29W400BB: 00EFh