W29C040-90Z Winbond Electronics, W29C040-90Z Datasheet - Page 11

• Manufacturer Part Number: W29C040-90Z
• Manufacturer: Winbond Electronics

Specifications of W29C040-90Z

• Density: 4Mb
• Access Time (max): 90ns
• Interface Type: Parallel
• Boot Type: Bottom/Top
• Address Bus: 19b
• Operating Supply Voltage (typ): 5V
• Operating Temp Range: 0C to 70C
• Package Type: PDIP
• Program/erase Volt (typ): 4.5 to 5.5V
• Sync/async: Asynchronous
• Operating Temperature Classification: Commercial
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Word Size: 8b
• Number Of Words: 512K
• Supply Current: 50mA
• Mounting: Through Hole
• Pin Count: 32
• Lead Free Status / Rohs Status: Compliant

Command Codes for Boot Block Lockout Enable
Boot Block Lockout Enable Acquisition Flow
Notes for boot block lockout enable:
1. Data Format: DQ 7 − DQ0 (Hex)
2. Address Format: A14 − A0 (Hex)
3. If you have any questions about this command sequence, please contact the local distributor or Winbond Electronics Corp.
BYTE SEQUENCE
0 Write
1 Write
2 Write
3 Write
4 Write
5 Write
6 Write
BOOT BLOCK LOCKOUT FEATURE SET
ON FIRST 16K ADDRESS BOOT BLOCK
Boot Block Lockout
Address Boot Block
Feature Set on First 16K
W ait for 10 m S
ADDRESS
Load data AA
address 00000
address 5555
address 2AAA
address 2AAA
address 5555
Load data 55
address 5555
address 5555
Load data AA
Load data 80
Load data 40
00000H
Load data 55
Load data 00
2AAAH
2AAAH
5555H
5555H
5555H
5555H
to
to
to
to
to
Pause 10 mS
to
to
- 11 -
DATA
AAH
AAH
55H
80H
55H
40H
00H
Boot Block Lockout
Address Boot Block
Feature Set on Last 16K
address 7FFFF
W ait for 10 m S
address 5555
address 2AAA
address 2AAA
Load data AA
address 5555
address 5555
address 5555
Load data 55
Load data 80
Load data AA
Load data 40
Load data 55
Load data FF
to
to
to
to
to
to
to
Publication Release Date: Aug. 14, 2006
BOOT BLOCK LOCKOUT FEATURE SET
ON LAST 16K ADDRESS BOOT BLOCK
ADDRESS
7FFFFH
2AAAH
2AAAH
5555H
5555H
5555H
5555H
Pause 10 mS
W29C040
DATA
Revision A11
AAH
AAH
FFH
55H
80H
55H
40H