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M27C516-45XC1TR Datasheet(PDF) 8 Page - STMicroelectronics

No. de pieza M27C516-45XC1TR
Descripción Electrónicos  512 Kbit (32Kb x16) OTP EPROM
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M27C516-45XC1TR Datasheet(HTML) 8 Page - STMicroelectronics

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tAVPL
VALID
AI00936
A0-A14
Q0-Q15
VPP
VCC
P
G
DATA IN
DATA OUT
E
tQVPL
tVPHPL
tVCHPL
tPHQX
tPLPH
tGLQV
tQXGL
tELPL
tGHQZ
tGHAX
PROGRAM
VERIFY
Figure 6. Programming and Verify Modes AC Waveforms
AI00707C
n= 0
Last
Addr
VERIFY
P = 100
µs Pulse
++n
=25
++ Addr
VCC = 6.25V, VPP = 12.75V
FAIL
CHECK ALL WORDS
1st: VCC =6V
2nd: VCC = 4.2V
YES
NO
YES
NO
YES
NO
Figure 7. Programming Flowchart
PRESTO II Programming Algorithm
PRESTO II Programming Algorithm allows to pro-
gram the whole array with a guaranteedmargin, in
a typical time of 3 seconds. Programming with
PRESTO II involves the application of a sequence
of 100
µs programpulses to each byteuntil 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 provides necessary margin to
each programmed cell.
Program Inhibit
Programming of multiple M27C516s in parallelwith
different data is also easily accomplished. Except
for E, all like inputs including G of the parallel
M27C516 may be common. A TTL low level pulse
applied to a M27C516’s P input, with E low and VPP
at 12.75V,will program that M27C516. A high level
E input inhibits the other M27C516s from being
programmed.
Program Verify
A verify (read) should be performed on the pro-
grammed bits to determine that they were correctly
programmed. The verify is accomplished with E
and G at VIL, P at VIH,VPP at 12.75V and VCC at
6.25V.
8/12
M27C516


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