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Intel Corporation
Intel Corporation



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E28F400BX-T120 pdf
4-MBIT (256K X 16 512K X 8)
28F400BX-T B 28F004BX-T B
Y x8 x16 Input Output Architecture
28F400BX-T 28F400BX-B
For High Performance and High
Integration 16-bit and 32-bit CPUs
Y x8-only Input Output Architecture
28F004BX-T 28F004BX-B
For Space Constrained 8-bit
Y Upgradeable to Intel’s Smart Voltage
Y Optimized High-Density Blocked
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
Y Extended Cycling Capability
100 000 Block Erase Cycles
Y Automated Word Byte Write and Block
Command User Interface
Status Registers
Erase Suspend Capability
Y SRAM-Compatible Write Interface
Y Automatic Power Savings Feature
1 mA Typical ICC Active Current in
Static Operation
Y Very High-Performance Read
60 80 120 ns Maximum Access Time
30 40 40 ns Maximum Output Enable
Y Low Power Consumption
20 mA Typical Active Read Current
Y Reset Deep Power-Down Input
0 2 mA ICC Typical
Acts as Reset for Boot Operations
Y Extended Temperature Operation
b40 C to a85 C
Y Write Protection for Boot Block
Y Hardware Data Protection Feature
Erase Write Lockout During Power
Y Industry Standard Surface Mount
28F400BX JEDEC ROM Compatible
44-Lead PSOP
56-Lead TSOP
28F004BX 40-Lead TSOP
Y 12V Word Byte Write and Block Erase
VPP e 12V g5% Standard
VPP e 12V g10% Option
Y ETOXTM III Flash Technology
5V Read
Other brands and names are the property of their respective owners
Information in this document is provided in connection with Intel products Intel assumes no liability whatsoever including infringement of any patent or
copyright for sale and use of Intel products except as provided in Intel’s Terms and Conditions of Sale for such products Intel retains the right to make
changes to these specifications at any time without notice Microcomputer Products may have minor variations to this specification known as errata
November 1995
Order Number 290451-005

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E28F400BX-T120 pdf
28F400BX-T B 28F004BX-T B
Intel’s 4-Mbit Flash Memory Family is an extension of the Boot Block Architecture which includes block-selec-
tive erasure automated write and erase operations and standard microprocessor interface The 4-Mbit Flash
Memory Family enhances the Boot Block Architecture by adding more density and blocks x8 x16 input out-
put control very high speed low power an industry standard ROM compatible pinout and surface mount
packaging The 4-Mbit flash family is an easy upgrade from Intel’s 2-Mbit Boot Block Flash Memory Family
The Intel 28F400BX-T B are 16-bit wide flash memory offerings These high density flash memories provide
user selectable bus operation for either 8-bit or 16-bit applications The 28F400BX-T and 28F400BX-B are
4 194 304-bit non-volatile memories organized as either 524 288 bytes or 262 144 words of information They
are offered in 44-Lead plastic SOP and 56-Lead TSOP packages The x8 x16 pinout conforms to the industry
standard ROM EPROM pinout
The Intel 28F004BX-T B are 8-bit wide flash memories with 4 194 304 bits organized as 524 288 bytes of
information They are offered in a 40-Lead TSOP package which is ideal for space-constrained portable
These devices use an integrated Command User Interface (CUI) and Write State Machine (WSM) for simplified
word byte write and block erasure The 28F400BX-T 28F004BX-T provide block locations compatible with
Intel’s MCS-186 family 80286 i386TM i486TM i860TM and 80960CA microprocessors The 28F400BX-B
28F004BX-B provide compatibility with Intel’s 80960KX and 80960SX families as well as other embedded
The boot block includes a data protection feature to protect the boot code in critical applications With a
maximum access time of 60 ns these 4-Mbit flash devices are very high performance memories which
interface at zero-wait-state to a wide range of microprocessors and microcontrollers A deep power-down
mode lowers the total VCC power consumption to 1 mW This is critical in handheld battery powered systems
For very low power applications using a 3 3V supply refer to the Intel 28F400BL-T B 28F004BL-T B 4-Mbit
Boot Block Flash Memory Family datasheet
Manufactured on Intel’s 0 8 micron ETOX III process the 4-Mbit flash memory family provides world class
quality reliability and cost-effectiveness at the 4-Mbit density level

Part Number E28F400BX-T120
Description 4-MBIT (256K X 16/ 512K X 8) BOOT BLOCK FLASH MEMORY FAMILY
Maker Intel Corporation - Intel Corporation
Total Page 30 Pages
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E28F400BX-T120 4-MBIT (256K X 16/ 512K X 8) BOOT BLOCK FLASH MEMORY FAMILY E28F400BX-T120
Intel Corporation

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