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參數(shù)資料
| 型號： | MC-428LFG641 |
| 廠商： | NEC Corp. |
| 英文描述： | 3.3 V Operation 8M-Word By 72-Bit Dynamic RAM Module(工作電壓為3.3V的DRAM模塊) |
| 中文描述： | 3.3 V工作電壓800萬字由72位動態(tài)內(nèi)存模塊（工作電壓為3.3伏的內(nèi)存模塊） |
| 文件頁數(shù)： | 9/32頁 |
| 文件大小： | 274K |
| 代理商： | MC-428LFG641 |
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9
MC-428LFG641
Read Cycle
Parameter
Symbol
t
RAC
= 50 ns
t
RAC
= 60 ns
Unit
Notes
MIN.
MAX.
MIN.
MAX.
Access time from /RAS
t
RAC
50
60
ns
1
Access time from /CAS
t
CAC
13
15
ns
1
Access time from column address
t
AA
25
30
ns
1
Access time from /OE
t
OEA
13
15
ns
Column address lead time referenced to /RAS
t
RAL
25
30
ns
Read command setup time
t
RCS
0
0
ns
Read command hold time referenced to /RAS
t
RRH
0
0
ns
2
Read command hold time referenced to /CAS
t
RCH
0
0
ns
2
Output buffer turn-off delay time from /OE
t
OEZ
0
10
0
13
ns
3
/CAS hold time to /OE
t
CHO
5
5
ns
4
Notes 1.
For read cycles, access time is defined as follows:
Input conditions
Access time
Access time from /RAS
t
RAD
≤
t
RAD (MAX.)
and t
RCD
≤
t
RCD (MAX.)
t
RAC (MAX.)
t
RAC (MAX.)
t
RAD
> t
RAD (MAX.)
and t
RCD
≤
t
RCD (MAX.)
t
AA (MAX.)
t
RAD
+ t
AA (MAX.)
t
RCD
> t
RCD (MAX.)
t
CAC (MAX.)
t
RCD
+ t
CAC (MAX.)
t
RAD (MAX.)
and t
RCD (MAX.)
are specified as reference points only; they are not restrictive operating parameters.
They are used to determine which access time (t
RAC
, t
AA
or t
CAC
) is to be used for finding out when output
data will be available. Therefore, the input conditions t
RAD
≥
t
RAD (MAX.)
and t
RCD
≥
t
RCD (MAX.)
will not cause
any operation problems.
2.
Either t
RCH (MIN.)
or t
RRH (MIN.)
should be met in read cycles.
3.
t
OEZ (MAX.)
defines the time when the output achieves the condition of Hi-Z and is not referenced to V
OH
or V
OL
.
4.
/WE : inactive (in read cycle)
/CAS : inactive, /OE : active ...... t
CHO
is effective.
/RAS, /OE : active ...... t
OCH
is effective.
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