E28F004BX-T120 View Datasheet(PDF) - Intel

Part Name

Description

Manufacturer

E28F004BX-T120

4-MBIT (256K X 16, 512K X 8) BOOT BLOCK FLASH MEMORY FAMILY

Intel 

28F400BX-T B 28F004BX-T B

1 3 Applications

The 4-Mbit boot block flash memory family com-

bines high density high performance cost-effective

flash memories with blocking and hardware protec-

tion capabilities Its flexibility and versatility will re-

duce costs throughout the product life cycle Flash

memory is ideal for Just-In-Time production flow re-

ducing system inventory and costs and eliminating

component handling during the production phase

During the product life cycle when code updates or

feature enhancements become necessary flash

memory will reduce the update costs by allowing ei-

ther a user-performed code change via floppy disk

or a remote code change via a serial link The 4-Mbit

boot block flash memory family provides full func-

tion blocked flash memories suitable for a wide

range of applications These applications include

Extended PC BIOS and ROM-able applications

storage Digital Cellular Phone program and data

storage Telecommunication boot firmware Print-

er firmware font storage and various other embed-

ded applications where both program and data stor-

age are required

Reprogrammable systems such as personal com-

puters are ideal applications for the 4-Mbit flash

memory products Portable and handheld personal

computer applications are becoming more complex

with the addition of power management software to

take advantage of the latest microprocessor tech-

nology the availability of ROM-based application

software pen tablet code for electronic hand writing

and diagnostic code Figure 1 shows an example of

a 28F400BX-T application

This increase in software sophistication augments

the probability that a code update will be required

after the PC is shipped The 4-Mbit flash memory

products provide an inexpensive update solution for

the notebook and handheld personal computers

while extending their product lifetime Furthermore

the 4-Mbit flash memory products’ power-down

mode provides added flexibility for these battery-

operated portable designs which require operation

at very low power levels

The 4-Mbit flash memory products also provide ex-

cellent design solutions for Digital Cellular Phone

and Telecommunication switching applications re-

quiring high performance high density storage capa-

bility coupled with modular software designs and a

small form factor package (X8-only bus) The

4-Mbit’s blocking scheme allows for an easy seg-

mentation of the embedded code with 16 Kbytes of

Hardware-Protected Boot code 4 Main Blocks of

program code and 2 Parameter Blocks of 8 Kbytes

each for frequently updatable data storage and diag-

nostic messages (e g phone numbers authoriza-

tion codes) Figure 2 is an example of such an appli-

cation with the 28F004BX-T

These are a few actual examples of the wide range

of applications for the 4-Mbit Boot Block flash mem-

ory family which enable system designers achieve

the best possible product design Only your imagina-

tion limits the applicability of such a versatile product

family

5

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