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M29W040-120N1R Datasheet(PDF) 10 Page - STMicroelectronics

Part # M29W040-120N1R
Description  4 Mbit 512Kb x8, Uniform Block Low Voltage Single Supply Flash Memory
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M29W040-120N1R Datasheet(HTML) 10 Page - STMicroelectronics

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Symbol
Alt
Parameter
Test Condition
M29W040
Unit
-100
-120
VCC = 3.3V
±0.3V
CL = 30pF
VCC = 3.3V
±0.3V
Min
Max
Min
Max
tAVAV
tRC
Address Valid to Next Address Valid
E = VIL,G= VIL
100
120
ns
tAVQV
tACC
Address Valid to Output Valid
E = VIL,G= VIL
100
120
ns
tELQX
(1)
tLZ
Chip Enable Low to Output Transition
G = VIL
00
ns
tELQV
(2)
tCE
Chip Enable Low to Output Valid
G = VIL
100
120
ns
tGLQX
(1)
tOLZ
Output Enable Low to Output
Transition
E= VIL
00
ns
tGLQV
(2)
tOE
Output Enable Low to Output Valid
E = VIL
40
50
ns
tEHQX
tOH
Chip Enable High to Output
Transition
G= VIL
00
ns
tEHQZ
(1)
tHZ
Chip Enable High to Output Hi-Z
G = VIL
20
30
ns
tGHQX
tOH
Output Enable High to Output
Transition
E= VIL
00
ns
tGHQZ
(1)
tDF
Output Enable High to Output Hi-Z
E = VIL
20
30
ns
tAXQX
tOH
Address Transition to Output
Transition
E=VIL,G= VIL
00
ns
Notes: 1. Sampled only, not 100% tested.
2. G may be delayed by up to tELQV -tGLQV after the falling edge of E without increasing tELQV.
Table 12A. Read AC Characteristics
(TA = 0 to 70
°C, –20 to 85°C or –40 to 85°C)
Toggle bit (DQ6). When Programming operations
are in progress, successive attempts to read DQ6
will output complementary data. DQ6 will toggle
following toggling of either G or E when G is low.
The operation is completed when two successive
reads yield the same output data. The next read
will output the bit last programmed or a ’1’ after
erasing. The toggle bit is valid only effective during
P/E.C. operations, that is after the fourth W pulse
for programming or after the sixth W pulse for
Erase. If the byte to be programmed belongs to a
protected block the command will be ignored. If the
blocks selected for erasure are protected, DQ6 will
toggle for about 100
µs and then return back to
Read. See Figure 11 for Toggle Bit flowchart and
Figure 12 for Toggle Bit waveforms.
Error bit (DQ5). This bit is set to ’1’ by the P/E.C
when there is a failure of byte programming, block
erase, or chip erase that results in invalid data
being programmedin the memory block. In case of
error in block erase or byte program, the block in
which the error occured or to which the pro-
grammed byte belongs, must be discarded. Other
blocks may still be used. Error bit resets after Reset
(RST) instruction. In case of success, the error bit
will set to ’0’ during Program or Erase and to valid
data after write operation is completed.
Erase Timer bit (DQ3). This bit is set to ’0’ by the
P/E.C. when the last Block Erase command has
been entered to the Command Interface and it is
awaiting the Erase start. When the erase timeout
period is finished, after 80 to 120
µs, DQ3 returns
back to ’1’.
Coded Cycles. The two coded cycles unlock the
Command Interface. They are followed by a com-
mand input or a comand confirmation. The coded
cycles consist of writing the data AAh at address
5555h during the first cycle and data 55h at address
2AAAh during the second cycle. Addresses are
latched on the falling edge of W or E while data is
latched on the rising edge of W or E. The coded
cycles happen on first and second cycles of the
command write or on the fourth and fifth cycles.
10/31
M29W040


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