SST25VF040B-50-4I-QAF Microchip Technology, SST25VF040B-50-4I-QAF Datasheet - Page 18

• Manufacturer Part Number: SST25VF040B-50-4I-QAF
• Description: IC FLASH SER 4MB 50MHZ SPI 8WSON
• Manufacturer: Microchip Technology

Specifications of SST25VF040B-50-4I-QAF

• Memory Type: FLASH
• Memory Size: 4M (512K x 8)
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 8-WSON
• Format - Memory: FLASH
• Speed: 50MHz
• Interface: SPI Serial
• Voltage - Supply: 2.7 V ~ 3.6 V
• Architecture: Sectored
• Interface Type: SPI
• Access Time: 50 ns
• Supply Voltage (max): 3.6 V
• Supply Voltage (min): 2.7 V
• Maximum Operating Current: 15 mA
• Mounting Style: SMD/SMT
• Organization: 32 KB
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

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©2011 Silicon Storage Technology, Inc.
Write-Enable (WREN)
Write-Disable (WRDI)
The Write-Enable (WREN) instruction sets the Write-Enable-Latch bit in the Status Register to 1 allow-
ing Write operations to occur. The WREN instruction must be executed prior to any Write (Program/
Erase) operation. The WREN instruction may also be used to allow execution of the Write-Status-Reg-
ister (WRSR) instruction; however, the Write-Enable-Latch bit in the Status Register will be cleared
upon the rising edge CE# of the WRSR instruction. CE# must be driven high before the WREN instruc-
tion is executed.
Figure 17:Write Enable (WREN) Sequence
The Write-Disable (WRDI) instruction resets the Write-Enable-Latch bit and AAI bit to 0 disabling any
new Write operations from occurring. The WRDI instruction will not terminate any programming opera-
tion in progress. Any program operation in progress may continue up to T
instruction. CE# must be driven high before the WRDI instruction is executed.
Figure 18:Write Disable (WRDI) Sequence
SCK
CE#
SCK
CE#
SO
SO
SI
SI
MODE 3
MODE 0
MODE 3
MODE 0
18
HIGH IMPEDANCE
HIGH IMPEDANCE
MSB
0 1 2 3 4 5 6 7
MSB
0 1 2 3 4 5 6 7
04
06
1295 WREN.0
1295 WRDI.0
4 Mbit SPI Serial Flash
BP
after executing the WRDI
SST25VF040B
S71295-06-000
Data Sheet
02/11