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E28F004BL-T150

4-MBlT (256K x 16, 512K x 8) LOW-POWER BOOT BLOCK FLASH MEMORY FAMILY

Intel 

28F400BL-T B 28F004BL-T B

The Status Register (SR) indicates the status of the

WSM and whether the WSM successfully completed

the desired program or erase operation

Maximum Access Time of 150 ns (tACC) is achieved

over the commercial temperature range (0 C to

a70 C) VCC supply voltage range (3 0V to 3 6V

4 5V to 5 5V) and 50 pF output load

Ipp Program current is 40 mA for x16 operation

and 30 mA for x8 operation IPP Erase current is

30 mA maximum VPP erase and programming

voltage is 11 4V to 12 6V (VPP e 12V g5%) un-

der all operating conditions

Typical ICC Active Current of 15 mA is achieved

for the x16 products and the x8 products

The 4-Mbit flash family is also designed with an Au-

tomatic Power Savings (APS) feature to minimize

system battery current drain and allow for very low

power designs Once the device is accessed to read

the array data APS mode will immediately put the

memory in static mode of operation where ICC active

current is typically 0 8 mA until the next read is initia-

ted

When the CE and RP pins are at VCC and the

BYTE pin (28F400BX-L-only) is at either VCC or

GND the CMOS Standby mode is enabled where

ICC is typically 45 mA

A Deep Power-Down Mode is enabled when the

PWD pin is at ground minimizing power consumption

and providing write protection during power-up con-

ditions ICC current during deep power-down mode

is 0 20 mA typical An initial maximum access time

or Reset Time of 600 ns is required from RP

switching until outputs are valid Equivalently the

device has a maximum wake-up time of 1 ms until

writes to the Command User Interface are recog-

nized When RP is at ground the WSM is reset the

Status Register is cleared and the entire device is

protected from being written to This feature pre-

vents data corruption and protects the code stored

in the device during system reset The system Reset

pin can be tied to RP to reset the memory to nor-

mal read mode upon activation of the Reset pin

When the CPU enters reset mode it expects to read

the contents of a memory location Furthermore

with on-chip program erase automation in the

4-Mbit family and the RP functionality for data pro-

tection when the CPU is reset and even if a program

or erase command is issued the device will not rec-

ognize any operation until RP returns to its normal

state

For the 2SF400BL Byte-wide or Word-wide In-

put Output Control is possible by controlling the

BYTE pin When the BYTE pin is at a logic low

the device is in the byte-wide mode (x8) and data is

read and written through DQ 0 7 During the byte-

wide mode DQ 8 14 are tri-stated and DQ15 Ab1

becomes the lowest order address pin When the

BYTE pin is at a logic high the device is in the

word-wide mode (x16) and data is read and written

through DQ 0 15

1 3 Applications

The 4-Mbit low power boot block flash memory fami-

ly combines high density very low power high per-

formance cost-effective flash memories with block-

ing and hardware protection capabilities Its flexibility

and versatility will reduce costs throughout the prod-

uct life cycle Flash memory is ideal for Just-In-Time

production flow reducing system inventory and

costs and eliminating component handling during

the production phase During the product life cycle

when code updates or feature enhancements be-

come necessary flash memory will reduce the up-

date costs by allowing either a user-performed code

change via floppy disk or a remote code change via

a serial link The 4-Mbit flash family provides full

function blocked flash memories suitable for a wide

range of applications These applications include

Extended PC BIOS and ROM-able applications

storage Handy Digital Cellular Phone program

and data storage and various other low power em-

bedded applications where both program and data

storage are required

Portable systems such as Notebook Palmtop com-

puters are ideal applications for the 4-Mbit low pow-

er flash 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 28F400BL-T application

This increase in software sophistication augments

the probability that a code update will be required

after the Notebook is shipped The 4-Mbit flash

products provide an inexpensive update solution for

the notebook and handheld personal computers

while extending their product lifetime Furthermore

the 4-Mbit flash products’ deep power-down mode

provides added flexibility for these battery-operated

portable designs which require operation at very low

power levels

4

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