MC-458CB646 Datasheet, PDF (9/16 Pages) NEC – 8M-WORD BY 64-BIT SYNCHRONOUS DYNAMIC RAM MODULE UNBUFFERED TYPE

MC-458CB646
Asynchronous Characteristics
Parameter
Symbol
-A 80
MIN.
MAX.
-A 10
MIN.
MAX.
Unit Note
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
Delay time ACT to READ/WRITE command
ACT(one) to ACT(another) command period
Data-in to PRE command period
Data-in to ACT(REF) command period /CAS latency = 3
E_{(Auto precharge)}
/CAS latency = 2
Mode register set cycle time
Transition time
OL ^{Refresh time (4,096 refresh cycles)}
tRP
tRCD
tRRD
tDPL
tDAL3
tDAL2
tRSC
tT
tREF
20
20
16
8
1CLK+20
1CLK+20
2
0.5
30
64
20
20
20
10
1CLK+20
1CLK+20
2
1
30
64
ns
ns
ns
ns
ns
ns
CLK
ns
ms
Product
Data Sheet E0063N10
9