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MT28F004B5 Datasheet

  • MT28F004B5

  • FLASH MEMORY

  • 32頁

  • MICRON

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SMART 5 BOOT BLOCK FLASH MEMORY
FLASH MEMORY
MT28F004B5
MT28F400B5
5V Only, Dual Supply (Smart 5)
0.3碌m Process Technology
FEATURES
鈥?Seven erase blocks:
16KB/8K-word boot block (protected)
Two 8KB/4K-word parameter blocks
Four main memory blocks
鈥?Smart 5 technology (B5):
5V 鹵10% V
CC
5V 鹵10% V
PP
application/production
programming
12V 鹵5% V
PP
compatibility production
programming
鈥?Address access times: 60ns, 80ns
鈥?100,000 ERASE cycles
鈥?Industry-standard pinouts
鈥?Inputs and outputs are fully TTL-compatible
鈥?Automated write and erase algorithm
鈥?Two-cycle WRITE/ERASE sequence
鈥?Byte- or word-wide READ and WRITE
(MT28F400B5, 256K x 16/512K x 8)
鈥?Byte-wide READ and WRITE only
(MT28F004B5, 512K x 8)
鈥?TSOP and SOP packaging options
40-Pin TSOP Type I 48-Pin TSOP Type I
44-Pin SOP
GENERAL DESCRIPTION
The MT28F004B5 (x8) and MT28F400B5 (x16, x8)
are nonvolatile, electrically block-erasable (flash), pro-
grammable, read-only memories containing 4,194,304
bits organized as 262,144 words (16 bits) or 524,288
bytes (8 bits). Writing or erasing the device is done with
a 5V V
PP
voltage, while all operations are performed
with a 5V V
CC
. Due to process technology advances, 5V
V
PP
is optimal for application and production program-
ming. For backward compatibility with SmartVoltage
technology, 12V V
PP
is supported for a maximum of 100
cycles and may be connected for up to 100 cumulative
hours. These devices are fabricated with Micron鈥檚 ad-
vanced CMOS floating-gate process.
The MT28F004B5 and MT28F400B5 are organized
into seven separately erasable blocks. To ensure that
critical firmware is protected from accidental erasure or
overwrite, the devices feature a hardware-protected
boot block. Writing or erasing the boot block requires
either applying a super-voltage to the RP# pin or driv-
ing WP# HIGH in addition to executing the normal
write or erase sequences. This block may be used to store
code implemented in low-level system recovery. The
remaining blocks vary in density and are written and
erased with no additional security measures.
Please refer to Micron鈥檚 Web site (www.micron.com/
flash/htmls/datasheets.html)p for the latest data sheet.
OPTIONS
鈥?Timing
60ns access
80ns access
80ns access
鈥?Configurations
512K x 8
256K x 16/512K x 8
鈥?Boot Block Starting Word Address
Top (3FFFFH)
Bottom (00000H)
鈥?Operating Temperature Range
Commercial (0擄C to +70擄C)
Extended (-40擄C to +85擄C)
鈥?Packages
Plastic 44-pin SOP (600 mil)
Plastic 48-pin TSOP Type 1
(12mm x 20mm)
Plastic 40-pin TSOP
(10mm x 20mm)
Part Number Example:
MARKING
-6
-8
-8 ET
MT28F004B5
MT28F400B5
T
B
None
ET
SG
WG
VG
MT28F400B5SG-8 T
4Mb Smart 5 Boot Block Flash Memory
F44_B.p65 鈥?Rev. 7/02
1
Micron Technology, Inc., reserves the right to change products or specifications without notice.
漏2002, Micron Technology, Inc.
PRODUCTS AND SPECIFICATIONS DISCUSSED HEREIN ARE SUBJECT TO CHANGE BY MICRON WITHOUT NOTICE.

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