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參數資料
| 型號： | μPD4264400 |
| 廠商： | NEC Corp. |
| 英文描述： | 64 M-Bit Dynamic RAM(64M 動態(tài)RAM) |
| 中文描述： | 64 m位動態(tài)隨機存儲器（RAM的6400動態(tài)） |
| 文件頁數： | 10/28頁 |
| 文件大?。?/td> | 256K |
| 代理商： | ΜPD4264400 |
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μ
PD4264400, 4265400
10
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 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
–
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
Output buffer turn-off delay time from CAS
t
OFF
0
10
0
13
ns
3
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
OFF (MAX.)
and t
OEZ(MAX.)
define the time when the output achieves the condition of Hi-Z and is not referenced
to V
OH
or V
OL
.
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