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M295V040-120XK6R Datasheet(PDF) 4 Page - STMicroelectronics

Part # M295V040-120XK6R
Description  4 Mbit 512Kb x8, Uniform Block Single Supply Flash Memory
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M295V040-120XK6R Datasheet(HTML) 4 Page - STMicroelectronics

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Operation
E
G
W
DQ0 - DQ7
Read
VIL
VIL
VIH
Data Output
Write
VIL
VIH
VIL
Data Input
Output Disable
VIL
VIH
VIH
Hi-Z
Standby
VIH
X
X
Hi-Z
Note:
X = VIL or VIH
Table 3. Operations
Code
E
G
W
A0A1A6A9
Other
Addresses
DQ0 - DQ7
Manufact. Code
VIL
VIL
VIH
VIL
VIL
VIL
VID
Don’t Care
20h
Device Code
VIL
VIL
VIH
VIH
VIL
VIL
VID
Don’t Care
E2h
Table 4. Electronic Signature
Code
E
G
W
A0
A1
A6
A16
A17
A18
Other
Addresses
DQ0 - DQ7
Protected Block
VIL
VIL
VIH
VIL
VIH
VIL
SA
SA
SA
Don’t Care
01h
Unprotected Block
VIL
VIL
VIH
VIL
VIH
VIL
SA
SA
SA
Don’t Care
00h
Note:
SA = Address of block being checked
Table 5. Block Protection Status
DEVICE OPERATION
Signal Descriptions
Address Inputs (A0-A18). The address inputs for
the memory array are latched during a write opera-
tion. The A9 address input is used also for the
Electronic Signature read and Block Protect veri-
fication. When A9 is raised to VID, either a Read
Manufacturer Code, Read Device Code or Verify
Block Protection is enabled depending on the com-
bination of levels on A0, A1 and A6. When A0, A1
and A6 are Low, the Electronic Signature Manufac-
turer code is read, when A0 is High and A1 and A6
are Low, the Device code is read, and when A1 is
High and A0 and A6 are low, the Block Protection
Status is read for the block addressed by A16, A17,
A18.
Data Input/Outputs (DQ0-DQ7). The data input is
a byte to be programmed or a command written to
the C.I. Both are latched when Chip Enable E and
Write Enable W are active. The data output is from
the memory Array, the Electronic Signature, the
Data Polling bit (DQ7), the Toggle Bit (DQ6), the
Error bit (DQ5) or the Erase Timer bit (DQ3). Ou-
puts are valid when Chip Enable E and Output
Enable G are active. The output is high impedance
when the chip is deselected or the outputs are
disabled.
Chip Enable (E). The Chip Enable activates the
memory control logic, input buffers, decoders and
sense amplifiers. E High deselects the memory and
reduces the power consumption to the standby
level. E can also be used to control writing to the
command register and to the memory array, while
W remains at a low level. Addresses are then
latched on the falling edge of E while data is latched
on the rising edge of E. The Chip Enable must be
forced to VID during Block Unprotect operations.
Output Enable (G). The Output Enable gates the
outputs through the data buffers during a read
operation. G must be forced to VID level during
Block Protect and Block Unprotect operations.
Write Enable (W). This input controls writing to the
Command Register and Address and Data latches.
Addresses are latched on the falling edge of W, and
Data Inputs are latched on the rising edge of W.
VCC Supply Voltage. The power supply for all
operations (Read, Program and Erase).
VSS Ground. VSS is the reference for all voltage
measurements.
4/31
M29F040


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