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M27V512-200K6TR 数据表(PDF) 9 Page - STMicroelectronics

部件名 M27V512-200K6TR
功能描述  512 Kbit (64Kb x8) Low Voltage UV EPROM and OTP EPROM
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

M27V512-200K6TR 数据表(HTML) 9 Page - STMicroelectronics

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M27V512
PRESTO IIB Programming Algorithm
PRESTO IIB Programming Algorithm allows the
whole array to be programmed with a guaranteed
margin, in a typical time of 6.5 seconds. This can
be achieved with STMicroelectronics M27V512
due to several design innovations described in the
M27V512 datasheet to improve programming effi-
ciency and to provide adequate margin for reliabil-
ity. Before starting the programming the internal
MARGIN MODE circuit is set in order to guarantee
that each cell is programmed with enough margin.
Then a sequence of 100
µs program pulses are ap-
plied to each byte until a correct verify occurs. No
overprogram pulses are applied since the verify in
MARGIN MODE provides the necessary margin.
Program Inhibit
Programming of multiple M27V512s in parallel
with different data is also easily accomplished. Ex-
cept for E, all like inputs including GVPP of the par-
allel M27V512 may be common. A TTL low level
pulse applied to a M27V512’s E input, with VPP at
12.75V, will program that M27V512. A high level E
input inhibits the other M27V512s from being pro-
grammed.
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 G
at VIL. Data should be verified with tELQV after the
falling edge of E.
Figure 7. Programming and Verify Modes AC Waveforms
AI00737
tVPLEL
PROGRAM
DATA IN
A0-A15
E
GVPP
Q0-Q7
DATA OUT
tAVEL
tQVEL
tVCHEL
tVPHEL
tEHQX
tEHVPX
tELEH
tELQV
tEHAX
tEHQZ
VERIFY
VALID
VCC
Figure 8. Programming Flowchart
AI00738B
n= 0
Last
Addr
VERIFY
E = 100
µs Pulse
++n
=25
++ Addr
VCC = 6.25V, VPP = 12.75V
FAIL
CHECK ALL BYTES
1st: VCC =6V
2nd: VCC = 4.2V
YES
NO
YES
NO
YES
NO
SET MARGIN MODE
RESET MARGIN MODE


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