MT28F400B3SG-8 T TR Micron Technology Inc, MT28F400B3SG-8 T TR Datasheet - Page 12
![IC FLASH 4MBIT 80NS 44SOP](/photos/7/30/73005/44-sop_pkg_sml.jpg)
MT28F400B3SG-8 T TR
Manufacturer Part Number
MT28F400B3SG-8 T TR
Description
IC FLASH 4MBIT 80NS 44SOP
Manufacturer
Micron Technology Inc
Datasheet
1.MT28F004B3VG-8_B.pdf
(30 pages)
Specifications of MT28F400B3SG-8 T TR
Format - Memory
FLASH
Memory Type
FLASH - Nor
Memory Size
4M (512K x 8 or 256K x 16)
Speed
80ns
Interface
Parallel
Voltage - Supply
3 V ~ 3.6 V
Operating Temperature
0°C ~ 70°C
Package / Case
44-SOP
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Command Execution
ferent operational modes. Each mode allows specific
operations to be performed. Several modes require a
sequence of commands to be written before they are
reached. The following section describes the proper-
ties of each mode, and Table 3 lists all command
sequences required to perform the desired operation.
Read Array
upon power-up and after a RESET. If the device is in
any other mode, READ ARRAY (FFh) must be given to
return to the array read mode. Unlike the WRITE
SETUP command (40h), READ ARRAY does not need
to be given before each individual read access.
IDENTIFY DEVICE
to enter the identify device mode. While the device is
in this mode, any READ produces the device ID when
A0 is HIGH and manufacturer compatibility ID when
A0 is LOW. The device remains in this mode until
another command is given.
Write Sequence
the array. WRITE SETUP (40h or 10h) is given in the
first cycle. The next cycle is the WRITE, during which
Table 6:
NOTE:
09005aef8114a789
F45.fm - Rev. E 6/04 EN
READ ARRAY
IDENTIFY DEVICE
READ STATUS REGISTER
CLEAR STATUS REGISTER
ERASE SETUP/CONFIRM
ERASE SUSPEND/RESUME
WRITE SETUP/WRITE
ALTERNATE WORD/BYTE
WRITE
1. Must follow WRITE or ERASE CONFIRM commands to the CEL to enable Flash array READ cycles.
2. IA = Identify Address: 00h for manufacturer compatibility ID; 01h for device ID.
3. ID = Identify Data.
4. SRD = Status Register Data.
5. On x16 (X00) devices BA = Block Address (A12–A17), on x8 (00X) devices BA = Block Address (A13–A17/[A18]).
6. Addresses are “Don’t Care” in first cycle but must be held stable.
7. WA = Address to be written; WD = Data to be written to WA.
Commands are issued to bring the device into dif-
The array read mode is the initial state of the device
IDENTIFY DEVICE (90h) may be written to the CEL
Two consecutive cycles are needed to write data to
COMMANDS
Command Sequences
CYCLES
REQ’D
BUS
1
3
2
1
2
2
2
2
OPERATION ADDRESS
WRITE
WRITE
WRITE
WRITE
WRITE
WRITE
WRITE
WRITE
FIRST CYCLE
SMART 3 BOOT BLOCK FLASH MEMORY
12
X
X
X
X
X
X
X
X
the write address and data are issued and V
brought to V
requires that the RP# pin be brought to V
WP# pin be brought HIGH at the same time V
brought to V
or byte. V
completed (SR7 = 1).
bit (SR7) is at “0,” and the device does not respond to
any commands. Any READ operation produces the
status register contents on DQ0–DQ7. When the ISM
status bit (SR7) is set to a logic 1, the WRITE has been
completed, and the device goes into the status register
read mode until another command is given.
aborted except by a RESET or by powering down the
part. Doing either during a WRITE corrupts the data
being written. If only the WRITE SETUP command has
been given, the WRITE may be nullified by performing
a null WRITE. To execute a null WRITE, FFh must be
written when BYTE# is LOW, or FFFFh must be written
when BYTE# is HIGH. When the ISM status bit (SR7)
has been set, the device is in the status register read
mode until another command is issued.
While the ISM executes the WRITE, the ISM status
After the ISM has initiated the WRITE, it cannot be
Micron Technology, Inc., reserves the right to change products or specifications without notice.
DATA
90h
70h
50h
20h
B0h
40h
10h
FFh
PP
PPH
must be held at V
OPERATION ADDRESS
PPH
. The ISM now begins to write the word
WRITE
WRITE
WRITE
WRITE
READ
READ
. Writing to the boot block also
SECOND CYCLE
©2003 Micron Technology, Inc. All rights reserved.
WA
WA
BA
IA
PPH
X
X
until the WRITE is
DATA
D0h
D0h
SRD
WD
WD
HH
ID
or that the
4Mb
NOTES
2, 3
5, 6
6, 7
6, 7
PP
1
4
PP
is
is