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參數(shù)資料
| 型號： | μPD4264805 |
| 廠商： | NEC Corp. |
| 英文描述： | 8,388,608 Words by 8 Bits CMOS dynamic RAMs(64M 動態(tài)RAM) |
| 中文描述： | 8388608字8位的CMOS（6400動態(tài)RAM動態(tài)存儲器） |
| 文件頁數(shù)： | 12/36頁 |
| 文件大小： | 226K |
| 代理商： | ΜPD4264805 |
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μ
PD4264805, 42S65805, 4265805
12
Notes 1.
In CAS before RAS refresh cycles, t
RAS(MAX)
is 100
μ
s.
If 10
μ
s < t
RAS
< 100
μ
s, RAS precharge time for CAS before RAS self refresh (t
RPS
) is applied.
2.
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.
3.
t
CRP (MIN.)
requirement is applied to RAS, CAS cycles.
4.
This specification is applied only to the
μ
PD42S65805.
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.
CAS, OE: active ······ t
OCH
is effective.
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