參數(shù)資料
型號(hào)： μPD42S17405
廠商： NEC Corp.
英文描述： 16 M-Bit Dynamic RAM(16M 動(dòng)態(tài)RAM)
中文描述： 16 m位動(dòng)態(tài)隨機(jī)存儲(chǔ)器（RAM的1,600動(dòng)態(tài)）
文件頁數(shù)： 11/40頁
文件大?。?/td> 319K
代理商： ΜPD42S17405
μ
PD42S17405, 4217405
11
Common to Read, Write, Read Modify Write Cycle
Parameter
Symbol
t
RAC
= 50 ns
t
RAC
= 60 ns
t
RAC
= 70 ns
Unit
Notes
MIN.
MAX.
MIN.
MAX.
MIN.
MAX.
Read / Write cycle time
t
RC
84
–
104
–
124
–
ns
RAS precharge time
t
RP
30
–
40
–
50
–
ns
CAS precharge time
t
CPN
8
–
10
–
10
–
ns
RAS pulse width
t
RAS
50
10,000
60
10,000
70
10,000
ns
1
CAS pulse width
t
CAS
8
10,000
10
10,000
12
10,000
ns
RAS hold time
t
RSH
10
–
10
–
12
–
ns
CAS hold time
t
CSH
38
–
40
–
50
–
ns
RAS to CAS delay time
t
RCD
11
37
14
45
14
52
ns
2
RAS
to column address delay time
t
RAD
9
25
12
30
12
35
ns
2
CAS to RAS precharge time
t
CRP
5
–
5
–
5
–
ns
3
Row address setup time
t
ASR
0
–
0
–
0
–
ns
Row address hold time
t
RAH
7
–
10
–
10
–
ns
Column address setup time
t
ASC
0
–
0
–
0
–
ns
Column address hold time
t
CAH
7
–
10
–
12
–
ns
OE lead time referenced to RAS
t
OES
0
–
0
–
0
–
ns
CAS to data setup time
t
CLZ
0
–
0
–
0
–
ns
OE to data setup time
t
OLZ
0
–
0
–
0
–
ns
OE to data delay time
t
OED
10
–
13
–
15
–
ns
Transition time (rise and fall)
t
T
1
50
1
50
1
50
ns
Refresh time
μ
PD42S17405
t
REF
–
128
–
128
–
128
ms
4
μ
PD4217405
–
32
–
32
–
32
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
PD42S17405.
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