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MC-458CB646 Datasheet(PDF) 9 Page - NEC

Part # MC-458CB646
Description  8M-WORD BY 64-BIT SYNCHRONOUS DYNAMIC RAM MODULE UNBUFFERED TYPE
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Manufacturer  NEC [NEC]
Direct Link  http://www.nec.com/
Logo NEC - NEC

MC-458CB646 Datasheet(HTML) 9 Page - NEC

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Data Sheet M13049EJ7V0DS00
9
MC-458CB646
Asynchronous Characteristics
Parameter
Symbol
-A 80
-A 10
Unit
Note
MIN.
MAX.
MIN.
MAX.
REF to REF/ACT command period
tRC
70
70
ns
ACT to PRE command period
tRAS
48
120,000
50
120,000
ns
PRE to ACT command period
tRP
20
20
ns
Delay time ACT to READ/WRITE command
tRCD
20
20
ns
ACT(one) to ACT(another) command period
tRRD
16
20
ns
Data-in to PRE command period
tDPL
810
ns
Data-in to ACT(REF) command period /CAS latency = 3
tDAL3
1CLK+20
1CLK+20
ns
(Auto precharge)
/CAS latency = 2
tDAL2
1CLK+20
1CLK+20
ns
Mode register set cycle time
tRSC
22
CLK
Transition time
tT
0.5
30
1
30
ns
Refresh time (4,096 refresh cycles)
tREF
64
64
ms


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