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M29W022BT Datasheet(PDF) 2 Page - STMicroelectronics

Part No. M29W022BT
Description  2 Mbit 256Kb x8, Boot Block Low Voltage Single Supply Flash Memory
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M29W022BT Datasheet(HTML) 2 Page - STMicroelectronics

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M29W022BT, M29W022BB
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Figure 2. TSOP Connections
A1
A0
DQ0
A7
A4
A3
A2
A6
A5
A13
A10
A8
A9
DQ7
A14
A11
G
E
DQ5
DQ1
DQ2
DQ3
DQ4
DQ6
A17
W
A16
A12
NC
VCC
A15
AI02970
M29W022BT
M29W022BB
8
1
9
16
17
24
25
32
VSS
Table 1. Signal Names
A0-A17
Address Inputs
DQ0-DQ7
Data Inputs/Outputs
E
Chip Enable
G
Output Enable
W
Write Enable
VCC
Supply Voltage
VSS
Ground
NC
Not Connected Internally
be protected independently to prevent accidental
Program or Erase commands from modifying the
memory. Program and Erase commands are writ-
ten to the Command Interface of the memory. An
on-chip Program/Erase Controller simplifies the
process of programming or erasing the memory by
taking care of all of the special operations that are
required to update the memory contents. The end
of a program or erase operation can be detected
and any error conditions identified. The command
set required to control the memory is consistent
with JEDEC standards.
The blocks in the memory are asymmetrically ar-
ranged, see Tables 3 and 4, Block Addresses. The
first or last 64 Kbytes have been divided into four
additional blocks. The 16 Kbyte Boot Block can be
used for small initialization code to start the micro-
processor, the two 8 Kbyte Parameter Blocks can
be used for parameter storage and the remaining
32 Kbyte is a small Main Block where the applica-
tion may be stored.
Chip Enable, Output Enable and Write Enable sig-
nals control the bus operation of the memory.
They allow simple connection to most micropro-
cessors, often without additional logic.
The memory is offered in a TSOP32 (8 x 14mm)
and PLCC32 packages and it is supplied with all
the bits erased (set to ’1’).
Figure 3. PLCC Connections
AI03045
A13
A10
17
A1
A0
DQ0
A7
A4
A3
A2
A6
A5
9
A8
1
A9
DQ7
A14
32
M29W022BT
M29W022BB
A11
G
E
25
SUMMARY DESCRIPTION
The M29W022B is a 2 Mbit (256Kb x8) non-vola-
tile memory that can be read, erased and repro-
grammed. These operations can be performed
using a single low voltage (2.7 to 3.6V) supply. On
power-up the memory defaults to its Read mode
where it can be read in the same way as a ROM or
EPROM.
The memory is divided into blocks that can be
erased independently so it is possible to preserve
valid data while old data is erased. Each block can


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