M29W040B 데이터 시트보기 (PDF) - STMicroelectronics
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M29W040B Datasheet PDF : 20 Pages
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M29W040B
Figure 2. PLCC Connections
A7
A6
A5
A4
A3 9
A2
A1
A0
DQ0
1 32
M29W040B
17
A14
A13
A8
A9
25 A11
G
A10
E
DQ7
AI02951
Figure 3. TSOP Connections
A11
A9
A8
A13
A14
A17
W
VCC
A18
A16
A15
A12
A7
A6
A5
A4
1
32
8 M29W040B 25
9
24
16
17
AI02952
G
A10
E
DQ7
DQ6
DQ5
DQ4
DQ3
VSS
DQ2
DQ1
DQ0
A0
A1
A2
A3
Table 1. Signal Names
A0-A18
Address Inputs
DQ0-DQ7 Data Inputs/Outputs
E
Chip Enable
G
Output Enable
W
Write Enable
VCC
Supply Voltage
VSS
Ground
SUMMARY DESCRIPTION
The M29W040B is a 4 Mbit (512Kb 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 M29W040B is fully backward com-
patible with the M29W040.
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
be protected independently to prevent accidental
2/20
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.
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 TSOP32 (8 x 20mm),
TSOP32 (8 x 14mm) and PLCC32 packages and
it is supplied with all the bits erased (set to ‘1’).
In order to meet environmental requirements, ST
offers the M29W040B in ECOPACK® packages.
ECOPACK packages are Lead-free. The category
of second Level Interconnect is marked on the
package and on the inner box label, in compliance
with JEDEC Standard JESD97. The maximum rat-
ings related to soldering conditions are also
marked on the inner box label.
ECOPACK is an ST trademark. ECOPACK speci-
fications are available at: www.st.com.
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