SST25VF040B-20-4C-QAE Microchip Technology, SST25VF040B-20-4C-QAE Datasheet - Page 21

• 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

A Microchip Technology Company
©2011 Silicon Storage Technology, Inc.
Read-ID (RDID)
The Read-ID instruction (RDID) identifies the devices as SST25VF040B and manufacturer as SST.
This command is backward compatible to all SST25xFxxxA devices and should be used as default
device identification when multiple versions of SPI Serial Flash devices are used in a design. The
device information can be read from executing an 8-bit command, 90H or ABH, followed by address
bits [A
and the device ID is located in address 00001H. Once the device is in Read-ID mode, the manufac-
turer’s and device ID output data toggles between address 00000H and 00001H until terminated by a
low to high transition on CE#.
Refer to Tables 6 and 7 for device identification data.
Figure 21:Read-ID Sequence
Table 7: Product Identification
Manufacturer’s ID
Device ID
SCK
CE#
SO
SI
SST25VF040B
23
Note: The manufacturer s and device ID output stream is continuous until terminated by a low to high transition on CE#.
MODE 3
MODE 0
-A
1. 00H will output the manfacturer s ID first and 01H will output device ID first before toggling between the two.
0
]. Following the Read-ID instruction, the manufacturer’s ID is located in address 00000H
Device ID = 8DH for SST25VF040B
MSB
0 1 2 3 4 5 6 7 8
90 or AB
HIGH IMPEDANCE
00
15 16
21
00
23 24
MSB
ADD
31 32
1
MSB
Address
00000H
00001H
4 Mbit SPI Serial Flash
BF
39 40
Device ID
47 48
BF
SST25VF040B
55 56
Device ID
S71295-06-000
Data
BFH
8DH
63
IMPEDANCE
Data Sheet
HIGH
1295 RdID.0
T7.0 1295
02/11