64 Mbit Multi-Purpose Flash Plus
A Microchip Technology Company
SST39VF6401B / SST39VF6402B
Not Recommended for New Designs
Data Protection
The SST39VF640xB provide both hardware and software features to protect nonvolatile data from
inadvertent writes.
Hardware Data Protection
Noise/Glitch Protection: A WE# or CE# pulse of less than 5 ns will not initiate a write cycle.
V DD Power Up/Down Detection: The Write operation is inhibited when V DD is less than 1.5V.
Write Inhibit Mode: Forcing OE# low, CE# high, or WE# high will inhibit the Write operation. This pre-
vents inadvertent writes during power-up or power-down.
Hardware Block Protection
The SST39VF6402B support top hardware block protection, which protects the top 32 KWord block of
the device. The SST39VF6401B support bottom hardware block protection, which protects the bottom
32 KWord block of the device. The Boot Block address ranges are described in Table 3. Program and
Erase operations are prevented on the 32 KWord when WP# is low. If WP# is left floating, it is internally
held high via a pull-up resistor, and the Boot Block is unprotected, enabling Program and Erase opera-
tions on that block.
Table 3: Boot Block Address Ranges
Product
Bottom Boot Block
SST39VF6401B
Top Boot Block
SST39VF6402B
Address Range
000000H-007FFFH
3F8000H-3FFFFFH
T3.0 25008
?2011 Silicon Storage Technology, Inc.
9
DS25008A
08/11
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