參數(shù)資料
型號: μPD4217805L
廠商: NEC Corp.
英文描述: 3.3V OPERATION 16 M-BIT DYNAMIC RAM 2M-WORD BY 8-BIT,EDOM)
中文描述: 3.3伏運行16位動態(tài)隨機(jī)存儲器2m-word8位,江戶
文件頁數(shù): 11/36頁
文件大?。?/td> 307K
代理商: ΜPD4217805L
μ
PD42S17805L, 4217805L
11
Read Cycle
Parameter
Symbol
t
RAC
= 50 ns
t
RAC
= 60 ns
t
RAC
= 70 ns
Unit
Notes
MIN.
MAX.
MIN.
MAX.
MIN.
MAX.
Access time from RAS
t
RAC
50
60
70
ns
1
Access time from CAS
t
CAC
13
15
18
ns
1
Access time from column address
t
AA
25
30
35
ns
1
Access time from OE
t
OEA
13
15
18
ns
Column address lead time referenced to RAS
t
RAL
25
30
35
ns
Read command setup time
t
RCS
0
0
0
ns
Read command hold time referenced to RAS
t
RRH
0
0
0
ns
2
Read command hold time referenced to CAS
t
RCH
0
0
0
ns
2
Output buffer turn-off delay time from OE
t
OEZ
0
10
0
13
0
15
ns
3
CAS hold time to OE
t
CHO
5
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.
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
PD42S17805L.
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