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M27W800-150K6TR Folha de dados(PDF) 9 Page - STMicroelectronics

Nome de Peças M27W800-150K6TR
Descrição Electrónicos  8 Mbit 1Mb x 8 or 512Kb x 16 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

M27W800-150K6TR Folha de dados(HTML) 9 Page - STMicroelectronics

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M27W800
PRESTO III Programming Algorithm
The PRESTO III Programming Algorithm allows
the whole array to be programed with a guaran-
teed margin in a typical time of 26 seconds. Pro-
gramming with PRESTO III consists of applying a
sequence of 50µs program pulses to each word
until a correct verify occurs (see Figure 9). During
programing and verify operation a MARGIN
MODE circuit is automatically activated to guaran-
tee that each cell is programed with enough mar-
gin. No overprogram pulse is applied since the
verify in MARGIN MODE at VCC much higher than
3.6V provides the necessary margin to each pro-
grammed cell.
Program Inhibit
Programming of multiple M27W800s in parallel
with different data is also easily accomplished. Ex-
cept for E, all like inputs including G of the parallel
M27W800 may be common. A TTL low level pulse
applied to a M27W800's E input and VPP at 12.5V,
will program that M27W800. A high level E input
inhibits the other M27W800s 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 E
at VIH and G at VIL, VPP at 12.5V and VCC at
6.25V.
Figure 8. Programming and Verify Modes AC Waveforms
tAVEL
VALID
AI01599
A0-A18
Q0-Q15
BYTEVPP
VCC
G
DATA IN
DATA OUT
E
tQVEL
tVPHAV
tVCHAV
tEHQX
tELEH
tGLQV
tQXGL
tGHQZ
tGHAX
PROGRAM
VERIFY
Figure 9. Programming Flowchart
AI03600
n = 0
Last
Addr
VERIFY
E = 50
µs Pulse
++n
= 25
++ Addr
VCC = 6.25V, VPP = 12.5V
FAIL
CHECK ALL WORDS
BYTEVPP =VIH
1st: VCC = 5V
2nd: VCC = 2.7V
YES
NO
YES
NO
YES
NO


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