W28V400B Datasheet, PDF(1/48 Page) Winbond – 4M(512K x 8/256K x 16) SMARTVOLTAGE FLASH MEMORY

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W28V400B Datasheet, PDF (1/48 Pages) Winbond – 4M(512K x 8/256K x 16) SMARTVOLTAGE FLASH MEMORY

W28V400B/T

Table of Contents-

4M(512K Ã 8/256K Ã 16)

SMARTVOLTAGE FLASH MEMORY

1. GENERAL DESCRIPTION.................................................................................................................. 3

2. FEATURES ......................................................................................................................................... 3

3. PRODUCT OVERVIEW ...................................................................................................................... 4

4. BLOCK DIAGRAM .............................................................................................................................. 5

5. PIN CONFIGURATION ....................................................................................................................... 6

6. PIN DESCRIPTION ............................................................................................................................. 7

7. PRINCIPLES OF OPERATION........................................................................................................... 8

Data Protection ................................................................................................................................ 8

8. BUS OPERATION ............................................................................................................................. 10

Read............................................................................................................................................... 10

Output Disable ............................................................................................................................... 10

Standby .......................................................................................................................................... 10

Deep Power-down.......................................................................................................................... 10

Read Identifier Codes Operation ................................................................................................... 11

Write ............................................................................................................................................... 11

9. COMMAND DEFINITIONS................................................................................................................ 11

Read Array Command ................................................................................................................... 13

Read Identifier Codes Command................................................................................................... 13

Read Status Register Command ................................................................................................... 14

Clear Status Register Command ................................................................................................... 14

Block Erase Command .................................................................................................................. 14

Word/Byte Write Command ........................................................................................................... 15

Block Erase Suspend Command ................................................................................................... 15

Word/Byte Write Suspend Command ............................................................................................ 16

Considerations of Suspend ............................................................................................................ 16

Block Locking ................................................................................................................................. 16

10. DESIGN CONSIDERATIONS ......................................................................................................... 22

Three-line Output Control............................................................................................................... 22

RY/#BY, Block Erase and Word/Byte Write Polling....................................................................... 22

Power Supply Decoupling .............................................................................................................. 22

Publication Release Date: April 11, 2003

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Revision A4

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