W29C040-90Z Winbond Electronics, W29C040-90Z Datasheet - Page 8

• 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

Software Data Protection Acquisition Flow
Notes for software program code:
Data Format: DQ7 − DQ0 (Hex)
Address Format: A14 − A0 (Hex)
(Optional page-load
operation)
Software Data Protection
Enable Flow
Sequentially load
W ait for 10 m S or
up to 256 bytes
Load data AA
address 2AAA
address 5555
Load data A0
address 5555
of page data
Load data 55
toggle/polling
com pleted
Exit
to
to
to
- 8 -
Software Data Protection
Disable Flow
W ait for 10 m S
address 2AAA
address 2AAA
Load data AA
address 5555
Load data AA
address 5555
address 5555
Load data 55
Load data 55
Load data 80
Load data 20
address 5555
Exit
to
to
to
to
to
to
W29C040