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參數(shù)資料
| 型號： | MC-458CA727PFA-A75 |
| 廠商： | NEC Corp. |
| 英文描述： | 8M-WORD BY 72-BIT SYNCHRONOUS DYNAMIC RAM MODULE UNBUFFERED TYPE |
| 中文描述： | 800萬字的72位同步動態(tài)隨機存儲器模塊無緩沖型 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 190K |
| 代理商： | MC-458CA727PFA-A75 |
Data Sheet M14279EJ3V0DS00
9
MC-458CB647
Asynchronous Characteristics
Parameter
Symbol
-A75
Unit
Note
MIN.
MAX.
ACT to REF/ACT command period (operation)
t
RC
67.5
ns
REF to REF/ACT command period (refresh)
t
RC1
67.5
ns
ACT to PRE command period
t
RAS
45
120,000
ns
PRE to ACT command period
t
RP
20
ns
Delay time ACT to READ/WRITE command
t
RCD
20
ns
ACT(one) to ACT(another) command period
t
RRD
15
ns
Data-in to PRE command period
t
DPL
8
ns
Data-in to ACT(REF) command
/CAS latency = 3
t
DAL3
1CLK+22.5
ns
1
period (Auto precharge)
/CAS latency = 2
t
DAL2
1CLK+20
ns
1
Mode register set cycle time
t
RSC
2
CLK
Transition time
t
T
0.5
30
ns
Refresh time (4,096 refresh cycles)
t
REF
64
ms
Note
This device can satisfy the t
DAL3
spec of 1CLK+20 ns for up to and including 125 MHz operation.
#
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