W25X40BVDAIG Winbond Electronics, W25X40BVDAIG Datasheet - Page 35

• Manufacturer Part Number: W25X40BVDAIG
• Description: IC SPI FLASH 4MBIT 8PDIP
• Manufacturer: Winbond Electronics

Specifications of W25X40BVDAIG

• Format - Memory: FLASH
• Memory Type: FLASH
• Memory Size: 4M (512K x 8)
• Speed: 104MHz
• Interface: SPI Serial
• Voltage - Supply: 2.7 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9.2.22
The Read Unique ID Number instruction accesses a factory-set read-only 64-bit number that is unique
to each W25X10BV/20BV/40BV device. The ID number can be used in conjunction with user software
methods to help prevent copying or cloning of a system. The Read Unique ID instruction is initiated by
driving the /CS pin low and shifting the instruction code “4Bh” followed by a four bytes of dummy
clocks. After which, the 64-bit ID is shifted out on the falling edge of CLK as shown in figure 23.
DO
DO
DO
DO
*=MSB
*=MSB
Read Unique ID Number (4Bh)
24 25
24 25
26
26
27 28
27 28
Figure 23. Read Unique ID Number Instruction Sequence
29 30
29 30
31 32 33
31 32 33
34
34
- 35 -
35 36
35 36
37 38
37 38
W25X10BV/20BV/40BV
Publication Release Date: August 20, 2009
39
39
*
*
40
40
63 62 61 60 59
63 62 61 60 59
41
41
42 43 44 101 102 103
42 43 44 101 102 103
Preliminary -- Revision B
2
2
1
1
0
0