參數(shù)資料
型號(hào)： MC-4216LFF72
廠商： NEC Corp.
英文描述： 16M-Word By 72-BIT Dynamic RAM Module(動(dòng)態(tài)RAM模塊)
中文描述： 1,600 - Word的72位動(dòng)態(tài)內(nèi)存模塊（動(dòng)態(tài)內(nèi)存模塊）
文件頁(yè)數(shù)： 8/32頁(yè)
文件大小： 289K
代理商： MC-4216LFF72
8
MC-4216LFF72
Common to Read, Write, Read Modify Write Cycle
Parameter
Symbol
t
RAC
= 50 ns
t
RAC
= 60 ns
Unit
Notes
MIN.
MAX.
MIN.
MAX.
Read / Write cycle time
t
RC
84
104
ns
/RAS precharge time
t
RP
30
40
ns
/CAS precharge time
t
CPN
7
10
ns
/RAS pulse width
t
RAS
50
10,000
60
10,000
ns
/CAS pulse width
t
CAS
8
10,000
10
10,000
ns
/RAS hold time
t
RSH
18
20
ns
/CAS hold time
t
CSH
33
35
ns
/RAS to /CAS delay time
t
RCD
6
32
9
40
ns
1
/RAS to column address delay time
t
RAD
4
20
7
25
ns
1
/CAS to /RAS precharge time
t
CRP
10
10
ns
2
Row address setup time
t
ASR
5
5
ns
Row address hold time
t
RAH
2
5
ns
Column address setup time
t
ASC
0
0
ns
Column address hold time
t
CAH
7
10
ns
/OE lead time referenced to /RAS
t
OES
5
5
ns
/CAS to data setup time
t
CLZ
5
5
ns
/OE to data setup time
t
OLZ
5
5
ns
/OE to data delay time
t
OED
15
18
ns
Transition time (rise and fall)
t
T
1
50
1
50
ns
Refresh time
t
REF
64
64
ms
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.
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