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M27W202-200B6TR bảng dữ liệu(PDF) 8 Page - STMicroelectronics

tên linh kiện M27W202-200B6TR
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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M27W202
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Figure 6. Programming and Verify Modes AC Waveforms
tAVPL
VALID
AI00706
A0-A15
Q0-Q15
VPP
VCC
P
G
DATA IN
DATA OUT
E
tQVPL
tVPHPL
tVCHPL
tPHQX
tPLPH
tGLQV
tQXGL
tELPL
tGHQZ
tGHAX
PROGRAM
VERIFY
Figure 7. Programming Flowchart
AI02734
n= 0
Last
Addr
VERIFY
P = 100
µs Pulse
++n
=25
++ Addr
VCC = 6.25V, VPP = 12.75V
FAIL
CHECK ALL WORDS
1st: VCC =5V
2nd: VCC = 2.7V
YES
NO
YES
NO
YES
NO
PRESTO II Programming Algorithm
PRESTO II Programming Algorithm allows pro-
gramming of the whole array with a guaranteed
margin, in a typical time of 13 seconds. Program-
ming with PRESTO II consists of applying a se-
quence of 100
µs program pulses to each word
until a correct verify occurs (see Figure 7). During
programming and verify operation, a MARGIN
MODE circuit is automatically activated in order to
guarantee that each cell is programmed with
enough margin. No overprogram pulse is applied
since the verify in MARGIN MODE at VCC much
higher than 3.6V, provides necessary margin to
each programmed cell.
Program Inhibit
Programming of multiple M27W202s in parallel
with different data is also easily accomplished. Ex-
cept for E, all like inputs including G of the parallel
M27W202 may be common. A TTL low level pulse
applied to a M27W202’s P input, with E low and
VPP at 12.75V, will program that M27W202. A high
level E input inhibits the other M27W202s from be-
ing programmed.
Program Verify
A verify (read) should be performed on the pro-
grammed bits to determine that they were correct-
ly programmed. The verify is accomplished with E
and G at VIL, P at VIH,VPP at 12.75V and VCC at
6.25V.


Số phần tương tự - M27W202-200B6TR

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