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MC-458CB647EFA-A75 データシート(PDF) 9 Page - NEC

部品番号 MC-458CB647EFA-A75
部品情報  8M-WORD BY 64-BIT SYNCHRONOUS DYNAMIC RAM MODULE UNBUFFERED TYPE
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メーカー  NEC [NEC]
ホームページ  http://www.nec.com/
Logo NEC - NEC

MC-458CB647EFA-A75 データシート(HTML) 9 Page - NEC

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Data Sheet M14279EJ3V0DS00
9
MC-458CB647
Asynchronous Characteristics
Parameter
Symbol
-A 75
Unit
Note
MIN.
MAX.
ACT to REF/ACT command period (operation)
tRC
67.5
ns
REF to REF/ACT command period (refresh)
tRC1
67.5
ns
ACT to PRE command period
tRAS
45
120,000
ns
PRE to ACT command period
tRP
20
ns
Delay time ACT to READ/WRITE command
tRCD
20
ns
ACT(one) to ACT(another) command period
tRRD
15
ns
Data-in to PRE command period
tDPL
8ns
Data-in to ACT(REF) command
/CAS latency = 3
tDAL3
1CLK+22.5
ns
1
period (Auto precharge)
/CAS latency = 2
tDAL2
1CLK+20
ns
1
Mode register set cycle time
tRSC
2CLK
Transition time
tT
0.5
30
ns
Refresh time (4,096 refresh cycles)
tREF
64
ms
Note This device can satisfy the tDAL3 spec of 1CLK+20 ns for up to and including 125 MHz operation.
5


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