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M27V201-200XB1TR Folha de dados(PDF) 8 Page - STMicroelectronics

Nome de Peças M27V201-200XB1TR
Descrição Electrónicos  2 Mbit (256Kb x 8) Low Voltage UV EPROM and OTP EPROM
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M27V201-200XB1TR Folha de dados(HTML) 8 Page - 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 at VCC much
higher than 3.6V provides the necessary margin to
each programmed cell.
Program Inhibit
Programming of multiple M27V201s in parallel
with different data is also easily accomplished. Ex-
cept for E, all like inputs including G of the parallel
M27V201 may be common. A TTL low level pulse
applied to a M27V201’s P input, with E low and
VPP at 12.75V, will program that M27V201. A high
level E input inhibits the other M27V201s 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.
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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