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M28F201-120K3R Datasheet(PDF) 7 Page - STMicroelectronics

Part # M28F201-120K3R
Description  2 Mb 256K x 8, Chip Erase FLASH MEMORY
Download  21 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M28F201-120K3R Datasheet(HTML) 7 Page - STMicroelectronics

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background image
Symbol
Alt
Parameter
Test Condition
M28F201
Unit
-70
-90
-120
-150
VCC =
5V
±10%
VCC =
5V
±10%
VCC =
5V
±10%
VCC =
5V
±10%
EPROM
Interface
EPROM
Interface
EPROM
Interface
EPROM
Interface
Min
Max
Min
Max
Min
Max
Min
Max
tWHGL
Write Enable High to
Output Enable Low
6666
µs
tAVAV
tRC
Read Cycle Time
E = VIL,G = VIL
70
90
120
150
ns
tAVQV
tACC
Address Valid to
Output Valid
E=VIL,G = VIL
70
90
120
150
ns
tELQX
(1)
tLZ
Chip Enable Low to
Output Transition
G= VIL
0000
ns
tELQV
tCE
Chip Enable Low to
Output Valid
G= VIL
70
90
120
150
ns
tGLQX
(1 )
tOLZ
Output Enable Low
to Output Transition
E= VIL
0000
ns
tGLQV
tOE
Output Enable Low
to Output Valid
E= VIL
25
30
35
40
ns
tEHQZ
(1 )
Chip Enable High to
Output Hi-Z
G= VIL
0
25
0
30
0
30
0
35
ns
tGHQZ
(1)
tDF
Output Enable High
to Output Hi-Z
E= VIL
0
25
0
30
0
30
0
35
ns
tAXQX
tOH
Address Transition
to Output Transition
E=VIL,G = VIL
0000
ns
Note: 1. Sampled only, not 100% tested
Table 9. Read Only Mode AC Characteristics
((TA = 0 to 70
°C, –40 to 85 °C or –40 to 125 °C)
Erase and Erase Verify Modes. The memory is
erased by first Programming all bytes to 00h, the
Erase command then erases them to FFh. The
Erase Verify command is then used to read the
memory byte-by-byte for a content of FFh. The
Erase Mode is set-up by writing 20h to the com-
mand register. The write cycle is then repeated to
start the erase operation. Erasure starts on the
rising edge of W during this second cycle. Erase is
followed by an Erase Verify which reads an ad-
dressed byte. Erase Verify Mode is set-up by writ-
ing A0h to the command register and at the same
time supplying the address of the byte to be veri-
fied. The rising edge of W during the set-up of the
first Erase Verify Mode stops the Erase operation.
The following read cycle is made with an internally
generated margin voltage applied; reading FFh
indicates that all bits of the addressed byte are fully
erased. The whole contents of the memory are
verified by repeating the Erase Verify Operation,
first writing the set-up code A0h with the address
of the byte to be verified and then reading the byte
contents in a second read cycle.
As the Erase algorithm flow chart shows, when the
data read during Erase Verify is not FFh, another
Erase operation is performed and verification con-
tinues from the address of the last verified byte. The
command is terminated by writing another valid
command to the command register (for example
Program or Reset).
7/21
M28F201


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