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參數(shù)資料
| 型號(hào)： | MC-428LFC72 |
| 廠商： | NEC Corp. |
| 英文描述： | 3.3 V Operation 4M-Word By 64-Bit Dynamic RAM Module(工作電壓為3.3V的動(dòng)態(tài)RAM模塊) |
| 中文描述： | 3.3 V工作4分，64個(gè)字位動(dòng)態(tài)RAM模塊（工作電壓為3.3伏的動(dòng)態(tài)內(nèi)存模塊） |
| 文件頁(yè)數(shù)： | 7/28頁(yè) |
| 文件大?。?/td> | 223K |
| 代理商： | MC-428LFC72 |
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MC-428LFC72
7
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.
t
CRP (MIN.)
requirement is applied to /RAS, /CAS cycles.
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
–
18
–
20
ns
1
Access time from column address
t
AA
–
30
–
35
ns
1
Access time from /OE
t
OEA
–
18
–
20
ns
Column address lead time referenced to /RAS
t
RAL
30
–
35
–
ns
Read command setup time
t
RCS
0
–
0
–
ns
Read command hold time referenced to /RAS
t
RRH
–5
–
–5
–
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
5
15
5
18
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.
/CAS, /OE: active ······ t
OCH
is effective.
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