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M27W512-200B6TR データシート(PDF) 9 Page - STMicroelectronics

部品番号 M27W512-200B6TR
部品情報  512 Kbit 64Kb x8 Low Voltage UV EPROM and OTP EPROM
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M27W512-200B6TR データシート(HTML) 9 Page - STMicroelectronics

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M27W512
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 M27W512
due to several design innovations described in the
M27W512 datasheet to improve programming ef-
ficiency and to provide adequate margin for reli-
ability. Before starting the programming the
internal MARGIN MODE circuit must be set in or-
der to guarantee that each cell is programmed with
enough margin. Then a sequence of 100
µs pro-
gram pulses is applied to each byte until a correct
verify occurs (see Figure 8). No overprogram puls-
es are applied since the verify in MARGIN MODE
at VCC much higher than 3.6V, provides the nec-
essary margin.
Program Inhibit
Programming of multiple M27W512s in parallel
with different data is also easily accomplished. Ex-
cept for E, all like inputs including GVPP of the par-
allel M27W512 may be common. A TTL low level
pulse applied to a M27W512’s E input, with VPP at
12.75V, will program that M27W512. A high level
E input inhibits the other M27W512s 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 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
AI00738C
n= 0
Last
Addr
VERIFY
E = 100
µs Pulse
++n
=25
++ Addr
VCC = 6.25V, VPP = 12.75V
FAIL
CHECK ALL BYTES
1st: VCC =5V
2nd: VCC = 2.7V
YES
NO
YES
NO
YES
NO
SET MARGIN MODE
RESET MARGIN MODE


同様の部品番号 - M27W512-200B6TR

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