參數(shù)資料
型號(hào)： M27C4002-12XB1TR
廠商： 意法半導(dǎo)體
英文描述： 4 Mbit 256Kb x16 UV EPROM and OTP EPROM
中文描述： 4兆位存儲(chǔ)器的256Kb x16紫外線和OTP存儲(chǔ)器
文件頁(yè)數(shù)： 8/16頁(yè)
文件大小： 112K
代理商： M27C4002-12XB1TR
tAVEL
VALID
AI00730
A0-A17
Q0-Q15
VPP
VCC
G
DATA IN
DATA OUT
E
tQVEL
tVPHEL
tVCHEL
tEHQX
tELEH
tGLQV
tQXGL
tGHQZ
tGHAX
PROGRAM
VERIFY
Figure 6. Programmingand VerifyModes AC Waveforms
AI00726C
n = 0
Last
Addr
VERIFY
E = 100
μ
s 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. ProgrammingFlowchart
PRESTOII ProgrammingAlgorithm
PRESTO II Programming Algorithm allows the
whole array to be programmed with a guaranteed
margin,in atypicaltime of26.5seconds.Program-
ming with PRESTO II consists of applying a se-
quenceof 100
μ
s programpulsesto eachbyte until
a correct verify occurs(seeFigure 7). Duringpro-
grammingand verify operation,a MARGINMODE
circuitisautomaticallyactivatedin orderto guaran-
tee that each cell is programmed with enough
margin. Nooverprogrampulseisappliedsincethe
verify in MARGIN MODE providesnecessarymar-
gin to each programmedcell.
ProgramInhibit
Programming of multiple M27C4002s in parallel
with different data is also easily accomplished.
Except for E, all like inputs including G of the
parallel M27C4002 may be common. A TTL low
level pulse applied to a M27C4002’sE input, with
V
PP
at 12.75V,willprogramthatM27C4002. Ahigh
level E input inhibits the other M27C4002s from
beingprogrammed.
ProgramVerify
A verify (read) should be performed on the pro-
grammedbitsto determinethattheywere correctly
programmed. Theverifyis accomplishedwithG at
V
IL
, E at V
IH,
V
PP
at 12.75Vand V
CC
at 6.25V.
8/16
M27C4002
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