E
4-MBIT SmartVoltage BOOT BLOCK FAMILY
1.0 PRODUCT FAMILY OVERVIEW
•
5V program/erase operation has been added.
If switching VPP for write protection, switch to
GND (not 5V) for complete write protection. To
take advantage of 5V write-capability, allow for
connecting 5V to VPP and disconnecting 12V
from VPP line.
This datasheet contains the specifications for the
two branches of products in the SmartVoltage
4-Mbit boot block flash memory family: the -BE/CE
suffix products feature a low VCC operating range
of 2.7V–3.6V; the -BV/CV suffix products offer
3.0V–3.6V operation. Both BE/CE and BV/CV
products also operate at 5V for high-speed access
times. Throughout this datasheet, the 28F400
refers to all x8/x16 4-Mbit products, while
28F004B refers to all x8 4-Mbit boot block
products. Also, the term “2.7V” generally refers to
•
Enhanced
circuits
optimize
low
VCC
performance, allowing operation down to
VCC = 2.7V (using the BE product).
If you are using BX/BL 12V VPP boot block
products today, you should account for the
differences listed above and also allow for
connecting 5V to VPP and disconnecting 12V from
the full voltage range 2.7V–3.6V. Section
provides an overview of the flash memory family
including applications, pinouts and pin
descriptions. Sections and describe the
1
V
PP line, if 5V writes are desired.
2
3
memory organization and operation for these
products. Finally, Sections 4 and 5 contain the
family’s operating specifications.
1.2
Main Features
Intel’s SmartVoltage technology is the most
flexible voltage solution in the flash industry,
providing two discrete voltage supply pins: VCC for
read operation, and VPP for program and erase
operation. Discrete supply pins allow system
designers to use the optimal voltage levels for
their design. The 28F400BV/CV, 28F004BV,
28F400CE and 28F004BE provide program/erase
capability at 5V or 12V. The 28F400BV/CV and
28F004BV allow reads with VCC at 3.3 ± 0.3V or
5V, while the 28F400CE and 28F004BE allow
reads with VCC at 2.7V–3.6V or 5V. Since many
designs read from the flash memory a large
percentage of the time, read operation using the
2.7V or 3.3V ranges can provide great power
savings. If read performance is an issue, however,
5V VCC provides faster read access times.
1.1
New Features in the
SmartVoltage Products
The SmartVoltage boot block flash memory family
offers identical operation with the BX/BL 12V
program products, except for the differences listed
below. All other functions are equivalent to current
products, including signatures, write commands,
and pinouts.
•
WP# pin has replaced a DU (Don’t Use) pin.
Connect the WP# pin to control signal or to
VCC or GND (in this case, a logic-level signal
can be placed on DU pin). See Tables 2 and
9 to see how the WP# pin works.
Table 1. SmartVoltage Provides Total Voltage Flexibility
Product
Name
Bus
VCC
VPP
Width
2.7V–3.6V
3.3 ± 0.3V
5V ± 5%
5V ± 10%
5V ± 10%
12V ± 5%
28F004BV-T/B
28F400BV-T/B
x8
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
√
x8 or x16
28F400CV-T/B x8 or x16
28F004BE-T/B x8
√
√
28F400CE-T/B x8 or x16
5
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