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PRELIMINARY
4-MBIT (256K X 16, 512K X 8)
SmartVoltage BOOT BLOCK FLASH
MEMORY FAMILY
28F400BV-T/B, 28F400CV-T/B, 28F004BV-T/B
28F400CE-T/B, 28F004BE-T/B
n Intel SmartVoltage Technology
5V or 12V Program/Erase
2.7V, 3.3V or 5V Read Operation
Increased Programming Throughput
at 12V VPP
n Very High-Performance Read
5V: 60/80/120 ns Max. Access Time,
30/40 ns Max. Output Enable Time
3V: 110/150/180 ns Max Access
65/90 ns Max. Output Enable Time
2.7V: 120 ns Max Access 65 ns Max.
Output Enable Time
n Low Power Consumption
Max 60 mA Read Current at 5V
Max 30 mA Read Current at
2.7V–3.6V
n x8/x16-Selectable Input/Output Bus
28F400 for High Performance 16- or
32-bit CPUs
n x8-Only Input/Output Architecture
28F004B for Space-Constrained
8-bit Applications
n Optimized Array Blocking Architecture
One 16-KB Protected Boot Block
Two 8-KB Parameter Blocks
One 96-KB Main Block
Three 128-KB Main Blocks
Top or Bottom Boot Locations
n Absolute Hardware-Protection for Boot
Block
n Software EEPROM Emulation with
Parameter Blocks
n Extended Temperature Operation
–40°C to +85°C
n Extended Cycling Capability
100,000 Block Erase Cycles
(Commercial Temperature)
10,000 Block Erase Cycles
(Extended Temperature)
n Automated Word/Byte Program and
Block Erase
Industry-Standard Command User
Interface
Status Registers
Erase Suspend Capability
n SRAM-Compatible Write Interface
n Automatic Power Savings Feature
1 mA Typical ICC Active Current in
Static Operation
n Reset/Deep Power-Down Input
0.2 µA ICCTypical
Provides Reset for Boot Operations
n Hardware Data Protection Feature
Write Lockout during Power
Transitions
n Industry-Standard Surface Mount
Packaging
40-Lead TSOP
44-Lead PSOP: JEDEC ROM
Compatible
48-Lead TSOP
56-Lead TSOP
n Footprint Upgradeable from 2-Mbit and
to 8-Mbit Boot Block Flash Memories
n ETOX™ IV Flash Technology
July 1997
Order Number: 290530-005

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Information in this document is provided in connection with Intel products. No license, express or implied, by estoppel or
otherwise, to any intellectual property rights is granted by this document. Except as provided in Intel’s Terms and Conditions of
Sale for such products, Intel assumes no liability whatsoever, and Intel disclaims any express or implied warranty, relating to
sale and/or use of Intel products including liability or warranties relating to fitness for a particular purpose, merchantability, or
infringement of any patent, copyright or other intellectual property right. Intel products are not intended for use in medical, life
saving, or life sustaining applications.
Intel may make changes to specifications and product descriptions at any time, without notice.
The 28F400BV-T/B, 28F400CV-T/B, 28F004BV-T/B, 28F400CE-T/B, 28F004BE-T/B may contain design defects or errors
known as errata which may cause the product to deviate from published specifications. Current characterized errata are
available on request.
Contact your local Intel sales office or your distributor to obtain the latest specifications and before placing your product order.
Copies of documents which have an ordering number and are referenced in this document, or other Intel literature, may be
obtained from:
Intel Corporation
P.O. Box 7641
Mt. Prospect, IL 60056-7641
or call 1-800-879-4683
or visit Intel’s Website at http:\\www.intel.com
COPYRIGHT © INTEL CORPORATION, 1997
*Third-party brands and names are the property of their respective owners.
CG-041493

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4-MBIT SmartVoltage BOOT BLOCK FAMILY
CONTENTS
PAGE
1.0 PRODUCT FAMILY OVERVIEW .................... 5
1.1 New Features in the SmartVoltage
Products ..................................................... 5
1.2 Main Features.............................................. 5
1.3 Applications ................................................. 7
1.4 Pinouts......................................................... 7
1.5 Pin Descriptions......................................... 11
2.0 PRODUCT DESCRIPTION............................ 13
2.1 Memory Blocking Organization .................. 13
2.1.1 Boot Block........................................... 13
2.1.2 Parameter Blocks................................ 13
2.1.3 Main Blocks......................................... 13
3.0 PRODUCT FAMILY PRINCIPLES OF
OPERATION ................................................ 15
3.1 Bus Operations .......................................... 15
3.2 Read Operations........................................ 15
3.2.1 Read Array.......................................... 15
3.2.2 Intelligent Identifiers ............................ 17
3.3 Write Operations........................................ 17
3.3.1 Command User Interface (CUI)........... 17
3.3.2 Status Register ................................... 20
3.3.3 Program Mode .................................... 21
3.3.4 Erase Mode......................................... 21
3.4 Boot Block Locking .................................... 22
3.4.1 VPP = VIL for Complete Protection ....... 22
3.4.2 WP# = VIL for Boot Block Locking ....... 22
3.4.3 RP# = VHH or WP# = VIH forr Boot Block
Unlocking ........................................... 22
3.4.4 Upgrade Note for 8-Mbit 44-PSOP
Package............................................. 22
PAGE
3.5 Power Consumption...................................26
3.5.1 Active Power .......................................26
3.5.2 Automatic Power Savings (APS) .........26
3.5.3 Standby Power ....................................26
3.5.4 Deep Power-Down Mode.....................26
3.6 Power-Up/Down Operation.........................26
3.6.1 RP# Connected to System Reset ........26
3.6.2 VCC, VPP and RP# Transitions .............27
3.7 Power Supply Decoupling ..........................27
3.7.1 VPP Trace on Printed Circuit Boards....27
4.0 ABSOLUTE MAXIMUM RATINGS................28
5.0 COMMERCIAL OPERATING CONDITIONS .29
5.1 Applying VCC Voltages ...............................29
5.2 DC Characteristics .....................................30
5.3 AC Characteristics .....................................34
6.0 EXTENDED OPERATING CONDITIONS ......44
6.1 Applying VCC Voltages ...............................44
6.2 DC Characteristics .....................................45
6.3 AC Characteristics .....................................51
APENDIX A: Additional Information .................56
APPENDIX B: Additional Information...............57
PRELIMINARY
3

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4-MBIT SmartVoltage BOOT BLOCK FAMILY
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Number
-001
-002
-003
-004
-005
REVISION HISTORY
Description
Initial release of datasheet.
Status changed from Product Preview to Preliminary
28F400CV/CE/BE references and information added throughout.
2.7V CE/BE specs added throughout.
The following sections have been changed or rewritten: 1.1, 3.0, 3.2.1, 3.2.2, 3.3.1,
3.3.1.1, 3.3.2, 3.3.2.1, 3.3.3, 3.3.4, 3.6.2.
Note 2 added to Figure 3 to clarify 28F008B pinout vs. 28F008SA.
Sentence about program and erase WSM timeout deleted from Section 3.3.3, 3.3.4.
Erroneous arrows leading out of error states deleted from flowcharts in Figs. 9, 10.
Sections 5.1, 6.1 changed to “Applying VCC Voltages.” These sections completely
changed to clarify VCC ramp requirements.
IPPD 3.3V Commercial spec changed from 10 to 5 µA.
Capacitance tables added after commercial and extended DC Characteristics tables.
Test and slew rate notes added to Figs. 12, 13, 19, 20, 21.
Test configuration drawings (Fig. 14, 22) consolidated into one, with component
values in table. (Component values also rounded off).
tELFL, tELFH, tAVFL changed from 7 to 5 ns for 3.3V BV-60 commercial and 3.3V
TBV-80 extended, 10 to 5 ns for 3.3V BV-80 and BV-120 commercial.
tWHAX and tEHAX changed from 10 to 0 ns.
tPHWL changed from 1000 ns to 800 ns for 3.3V BV-80, BV-120 commercial.
tPHEL changed from 1000 ns to 800 ns for 3.3V BV-60, BV-80, and BV-120 commercial.
28F400BE row removed from Table 1
Applying VCC voltages (Sections 5.1 and 6.1) rewritten for clarity.
Minor cosmetic changes/edits.
Corrections: Spec typographical error “tQWL” corrected to read “tQVVL.”
Intel386™ EX Microprocessor block diagram updated because latest Intel386 CPU
specs require less glue logic.
Spec tELFL and tELFH changed from 5 ns (max) to 0 ns (min).
New specs tPLPH and tPLQX added from Specification Update document (297595).
Specs tEHQZ and tGHQZ improved on most voltage/speed combinations.
Correction: Appendix A, Ordering information fixed order numbers from TE27F400BVT80
to TE28F400BVT80 and TE27F400BVB80 to TE28F400BVB80.
Updated disclaimer.
4 PRELIMINARY

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4-MBIT SmartVoltage BOOT BLOCK FAMILY
1.0 PRODUCT FAMILY OVERVIEW
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
the full voltage range 2.7V–3.6V. Section 1
provides an overview of the flash memory family
including applications, pinouts and pin
descriptions. Sections 2 and 3 describe the
memory organization and operation for these
products. Finally, Sections 4 and 5 contain the
family’s operating specifications.
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.
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.
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
VPP line, if 5V writes are desired.
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.
Product
Name
28F004BV-T/B
28F400BV-T/B
28F400CV-T/B
28F004BE-T/B
28F400CE-T/B
Table 1. SmartVoltage Provides Total Voltage Flexibility
Bus
Width
2.7V–3.6V
VCC
3.3 ± 0.3V
5V ± 5%
5V ± 10%
VPP
5V ± 10% 12V ± 5%
x8 √ √ √ √
x8 or x16
√√√√
x8 or x16
√√√√
x8
√√√
x8 or x16
√√√
PRELIMINARY
5