W39L020 Data Sheet
256K
× 8 CMOS FLASH MEMORY
Publication Release Date: June 6, 2005
- 1 -
Revision A7
Table of Contents-
1.
GENERAL DESCRIPTION ......................................................................................................... 3
2.
FEATURES ................................................................................................................................. 3
3.
PIN CONFIGURATIONS............................................................................................................. 4
4.
BLOCK DIAGRAM ...................................................................................................................... 5
5.
PIN DESCRIPTION..................................................................................................................... 5
6.
FUNCTIONAL DESCRIPTION.................................................................................................... 6
6.1
Device Bus Operation..................................................................................................... 6
6.1.1
Read Mode ...................................................................................................................6
6.1.2
Write Mode ...................................................................................................................6
6.1.3
Standby Mode ..............................................................................................................6
6.1.4
Output Disable Mode....................................................................................................6
6.1.5
Auto-select Mode..........................................................................................................6
6.2
Data Protection ............................................................................................................... 7
6.2.1
Low VDD Inhibit............................................................................................................7
6.2.2
Write Pulse "Glitch" Protection .....................................................................................7
6.2.3
Logical Inhibit................................................................................................................7
6.2.4
Power-up Write and Read Inhibit..................................................................................7
6.3
Command Definitions ..................................................................................................... 8
6.3.1
Read Command ...........................................................................................................8
6.3.2
Auto-select Command ..................................................................................................8
6.3.3
Byte Program Command ..............................................................................................8
6.3.4
Chip Erase Command ..................................................................................................9
6.3.5
Sector/Page Erase Command ......................................................................................9
6.4
Write Operation Status ................................................................................................. 10
6.4.1
DQ7: Data Polling.......................................................................................................10
6.4.2
DQ6: Toggle Bit ..........................................................................................................10
7.
TABLE OF OPERATING MODES ............................................................................................ 11
7.1
Device Bus Operations ................................................................................................. 11
7.2
Auto-select Codes (High Voltage Method) ................................................................... 11
7.3
Sector Address Table ................................................................................................... 11
7.4
Software Product Identification and Boot Block Lockout Detection Flow Chart ........... 17
8.
ELECTRICAL CHARACTERISTICS......................................................................................... 18
8.1
Absolute maximum Ratings .......................................................................................... 18
8.2
D.C. Operating Characteristics ..................................................................................... 18
8.3
Pin Capacitance............................................................................................................ 18
8.4
A.C. Characteristics ...................................................................................................... 19