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M27C2001-10XC1X Folha de dados(PDF) 8 Page - STMicroelectronics

Nome de Peças M27C2001-10XC1X
Descrição Electrónicos  2 Mbit (256Kb x 8) UV EPROM and OTP EPROM
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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PRESTO II Programming Algorithm
PRESTO II Programming Algorithm allows the
whole array to be programmed with a guaranteed
margin, in a typical time of 26.5 seconds. Pro-
gramming with PRESTO II consists of applying a
sequence of 100
µs program pulses to each byte
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 provides the
necessary margin to each programmed cell.
Program Inhibit
Programming of multiple M27C2001s in parallel
with different data is also easily accomplished. Ex-
cept for E, all like inputs including G of the parallel
M27C2001 may be common. A TTL low level
pulse applied to a M27C2001’s P input, with E low
and VPP at 12.75V, will program that M27C2001.
A high level E input inhibits the other M27C2001s
from being 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.
Figure 6. Programming and Verify Modes AC Waveforms
tAVPL
VALID
AI00720
A0-A17
Q0-Q7
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
AI00715C
n= 0
Last
Addr
VERIFY
P = 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


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