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M29W008AT Datasheet(PDF) 5 Page - STMicroelectronics

Part No. M29W008AT
Description  8 Mbit 1Mb x8, Boot Block Low Voltage Single Supply Flash Memory
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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M29W008AT Datasheet(HTML) 5 Page - STMicroelectronics

 
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M29W008AT, M29W008AB
SIGNAL DESCRIPTIONS
See Figure 1 and Table 1.
Address Inputs (A0-A19). The address inputs
for the memory array are latched during a write op-
eration on the falling edge of Chip Enable E or
Write Enable W. When A9 is raised to VID, either a
Read Electronic Signature Manufacturer or Device
Code, Block Protection Status or a Write Block
Protection or Block Unprotection is enabled de-
pending on the combination of levels on A0, A1
A6, A12 and A15.
Data Input/Outputs (DQ0-DQ7). The
input
is
data to be programmed in the memory array or a
command to be written to the C.I. Both are latched
on the rising edge of Chip Enable E or Write En-
able W. The output is data from the Memory Array,
the Electronic Signature Manufacturer or Device
codes, the Block Protection Status or the Status
register Data Polling bit DQ7, the Toggle Bits DQ6
and DQ2, the Error bit DQ5 or the Erase Timer bit
DQ3. Outputs are valid when Chip Enable E and
Output Enable G are active. The output is high im-
pedance when the chip is deselected or the out-
puts are disabled and when RP is at a Low level.
Chip Enable (E). The Chip Enable input acti-
vates the memory control logic, input buffers, de-
coders and sense amplifiers. E High deselects the
memory and reduces the power consumption to
the stand-by level. E can also be used to control
writing to the command register and to the memo-
ry array, while W remains at a low level. The Chip
Enable must be forced to VID during the Block Un-
protection operation.
Output Enable (G). The Output Enable gates the
outputs through the data buffers during a read op-
eration. When G is High the outputs are High im-
pedance. G must be forced to VID level during
Block Protection and Unprotection operations.
Write Enable (W). This input controls writing to
the Command Register and Address and Data
latches.
Ready/Busy Output (RB). Ready/Busy
is
an
open-drain output and gives the internal state of
the P/E.C. of the device. When RB is Low, the de-
vice is Busy with a Program or Erase operation
and it will not accept any additional program or
erase instructions except the Erase Suspend in-
struction.
When RB is High, the device is ready for any
Read, Program or Erase operation. The RB will
also be High when the memory is put in Erase
Suspend or Stand-by modes.
Reset/Block Temporary Unprotect Input (RP).
The RP Input provides hardware reset and pro-
tected block(s) temporary unprotection functions.
Reset of the memory is achieved by pulling RP to
VIL for at least tPLPX. When the reset pulse is giv-
en, if the memory is in Read or Stand-by modes, it
will be available for new operations in tPHEL after
the rising edge of RP.
If the memory is in Erase, Erase Suspend or Pro-
gram modes the reset will take tPLYH during which
the RB signal will be held at VIL. The end of the
memory reset will be indicated by the rising edge
of RB. A hardware reset during an Erase or Pro-
gram operation will corrupt the data being pro-
grammed or the sector(s) being erased. See
Tables 15, 16 and Figure 8.
Temporary block unprotection is made by holding
RP at VID. In this condition previously protected
blocks can be programmed or erased. The transi-
tion of RP from VIH to VID must slower than tPH-
PHH. (See Tables 17, 18 and Figure 8). When RP
is returned from VID to VIH all blocks temporarily
unprotected will be again protected.
VCC Supply Voltage. The power supply for all
operations (Read, Program and Erase).
VSS Ground. VSS is the reference for all voltage
measurements.


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