SST25VF040B-20-4C-QAE Microchip Technology, SST25VF040B-20-4C-QAE Datasheet - Page 20

• Manufacturer Part Number: SST25VF040B-20-4C-QAE
• Description: Flash 512K X 8 14 us
• Manufacturer: Microchip Technology

Specifications of SST25VF040B-20-4C-QAE

• Product Category: Flash
• Rohs: yes
• Memory Size: 4 Mbit
• Interface Type: SPI
• Access Time: 20 ns
• Operating Temperature: + 70 C
• Mounting Style: SMD/SMT
• Package / Case: WSON-8

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©2011 Silicon Storage Technology, Inc.
JEDEC Read-ID
The JEDEC Read-ID instruction identifies the device as SST25VF040B and the manufacturer as SST.
The device information can be read from executing the 8-bit command, 9FH. Following the JEDEC
Read-ID instruction, the 8-bit manufacturer’s ID, BFH, is output from the device. After that, a 16-bit
device ID is shifted out on the SO pin. Byte 1, BFH, identifies the manufacturer as SST. Byte 2, 25H,
identifies the memory type as SPI Serial Flash. Byte 3, 8DH, identifies the device as SST25VF040B.
The instruction sequence is shown in Figure 20. The JEDEC Read ID instruction is terminated by a low
to high transition on CE# at any time during data output.
Figure 20:JEDEC Read-ID Sequence
Table 6: JEDEC Read-ID Data
Manufacturer’s ID
SCK
CE#
SO
SI
HIGH IMPEDANCE
MODE 3
MODE 0
Byte1
BFH
0 1 2 3 4 5 6 7 8
9F
MSB
9 10 11 12 13
20
BF
Memory Type
Byte 2
25H
14
15 16
MSB
17 18
4 Mbit SPI Serial Flash
19 20 21 22 23
25
Device ID
24 25 26 27
Memory Capacity
SST25VF040B
8D
1295 JEDECID.1
Byte 3
28 29 30 31
8DH
S71295-06-000
Data Sheet
32
33
34
T6.0 1295
02/11