28F400BX-T/B, 28F004BX-T/B
Follow these guidelines to ensure compatibility:
1.0 PRODUCT FAMILY OVERVIEW
Ý
1. Connect DU (WP on SmartVoltage products) to
a control signal or to V or GND.
Throughout this datasheet the 28F400BX refers to
both the 28F400BX-T and 28F400BX-B devices and
28F004BX refers to both the 28F004BX-T and
28F004BX-B devices. The 4-Mbit flash memory fam-
ily refers to both the 28F400BX and 28F004BX prod-
ucts. This datasheet comprises the specifications for
four separate products in the 4-Mbit flash memory
family. Section 1 provides an overview of the 4-Mbit
flash memory family including applications, pinouts
and pin descriptions. Sections 2 and 3 describe in
detail the specific memory organizations for the
28F400BX and 28F004BX products respectively.
Section 4 combines a description of the family’s
principles of operations. Finally Section 5 describes
the family’s operating specifications.
CC
2. If adding a switch on V for write protection,
PP
switch to GND for complete write protection.
3. Allow for connecting 5V to V and disconnect
PP
12V from the V line, if desired.
PP
1.2 Main Features
The 28F400BX/28F004BX boot block flash memory
family is a very high performance 4-Mbit (4,194,304
bit) memory family organized as either 256 KWords
(262,144 words) of 16 bits each or 512 Kbytes
(524,288 bytes) of 8 bits each.
Seven Separately Erasable Blocks including a
Hardware-Lockable boot block (16,384 Bytes),
Two parameter blocks (8,192 Bytes each) and
Four main blocks (1 block of 98,304 Bytes and 3
blocks of 131,072 Bytes) are included on the 4-Mbit
family. An erase operation erases one of the main
blocks in typically 2.4 seconds and the boot or pa-
rameter blocks in typically 1.0 seconds independent
of the remaining blocks. Each block can be indepen-
dently erased and programmed 100,000 times.
Product Family
X8/X16 Products
28F400BX-T
X8-Only Products
28F004BX-T
28F400BX-B
28F004BX-B
1.1 Designing for Upgrade to
SmartVoltage Products
The Boot Block is located at either the top
(28F400BX-T, 28F004BX-T) or the bottom
(28F400BX-B, 28F004BX-B) of the address map in
order to accommodate different microprocessor pro-
tocols for boot code location. The hardware locka-
ble boot block provides the most secure code stor-
age. The boot block is intended to store the kernel
code required for booting-up a system. When the
Today’s high volume boot block products are up-
gradable to Intel’s SmartVoltage boot block prod-
ucts that provide program and erase operation at 5V
or 12V V
and read operation at 3V or 5V V
.
PP
CC
Intel’s SmartVoltage boot block products provide the
following enhancements to the boot block products
described in this data sheet:
Ý
1. DU pin is replaced by WP to provide a means
Ý
RP pin is between 11.4V and 12.6V the boot block
is unlocked and program and erase operations can
to lock and unlock the boot block with logic sig-
nals.
Ý
be performed. When the RP pin is at or below 6.5V
2. 5V Program/Erase operation uses proven pro-
g
the boot block is locked and program and erase op-
erations to the boot block are ignored.
gram and erase techniques with 5V 10% ap-
plied to V
.
PP
The 28F400BX products are available in the ROM/
EPROM compatible pinout and housed in the
44-Lead PSOP (Plastic Small Outline) package and
the 56-Lead TSOP (Thin Small Outline, 1.2mm thick)
3. Enhanced circuits optimize performance at 3.3V
.
V
CC
Refer to the 2, 4 or 8 Mbit SmartVoltage Boot Block
Flash Memory Data Sheets for complete specifica-
tions.
package as shown in Figures
3 and 4. The
28F004BX products are available in the 40-Lead
TSOP (1.2mm thick) package as shown in Figure 5.
When you design with 12V V boot block products
PP
you should provide the capability in your board de-
sign to upgrade to SmartVoltage products.
The Command User Interface (CUI) serves as the
interface between the microprocessor or microcon-
troller and the internal operation of the 28F400BX
and 28F004BX flash memory products.
3
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